Archive for the ‘Nuclear’ Category

DPRK Energy Experts Working Group Meeting

Saturday, May 10th, 2008

From the Nautilus Institute (presentations at bottom):

Background
Energy insecurity is a critical dimension of the North Korean (DPRK) nuclear challenge, both in its making, and in its reversal. One of the Six-Party Talks working groups, the Economy and Energy Working Group, is largely devoted to this topic, and energy assistance will play an important role in the process of denuclearization of the DPRK. Nautilus Institute maintains a unique database and set of quantitative and qualitative analytic tools to evaluate and track the DPRK’s energy economy, and has maintained working relations with North Korean scientists and technical personnel from the energy sector for more than a decade. With this capacity, Nautilus has provided a stream of policy analyses and briefings at their request to US, ROK and other officials on the DPRK’s energy needs, its likely negotiating postures and demands, and possible negotiable options. The need for such expertise in support of the Six-Party Talks is increasing.

This project ensures that the underlying data and technical analysis available at Nautilus is as up-to-date as possible, and that analysis and policy advice are available when needed by US and other officials.
The Second DPRK Energy Experts’ Working Group (2008) served to provide information and views from key experts in the field to inform the Nautilus DPRK energy sector analysis update. Experts in attendance at the meeting provided both pertinent, recent data and special insights that are being used to help to make the database as reflective as possible of actual conditions in the DPRK. This in turn provides crucial input to the analysis needed to help to inform the parties to the 6-Party talks regarding possible approaches to DPRK energy sector redevelopment.

In addition, the DPRK Energy Experts Study Group Meeting served, as did the first Meeting, as an opportunity for experts on the DPRK to exchange views on the appropriate “next steps” in DPRK energy sector redevelopment. Key outcomes of this discussion are being reflected in the updated DPRK Energy Sector Analysis. In the process of discussions, the experts in attendance helped to further develop and elaborate-as well as providing input on the prospects for-the activities and means by which the various parties concerned with Korean peninsula affairs might engage and work with the DPRK to help resolve both the DPRK’s energy problems, and, in so doing, begin to address and ameliorate the regional and global insecurities of which the DPRK’s energy problems are a key part. In particular, through the focus of the second day of the meeting on Building Energy Efficiency, progress was made on consideration of possible benefits from and approaches to improving the effectiveness of energy use in the crucial DPRK buildings sector.

The Second DPRK Energy Experts Study Group Meeting convened by Nautilus and its partners will was attended by experts in a variety of areas related to energy supply and demand in the DPRK-including electricity, coal and other minerals, the DPRK economy as a whole, trade into and from the DPRK, and the DPRK’s rural household and agricultural sectors, and energy use in buildings in general in the DPRK and elsewhere (the primary topic of the second day of the Meeting)-to review and discuss the results of existing and newly-commissioned research, and to provide insights from their own experience and their own research. A total of approximately 15 experts on the DPRK and on matters related to DPRK issues attended the Meeting, not including an additional 15 experts, representatives from the organizations partnering to fund and organize the meeting (Nautilus, Tsinghua University, USDOE), including observers from bilateral aid agencies associated with a number of countries, from international organizations, from the business sector, and others, who also lent their expertise to the workshop. On the second day of the workshop, supported by funding from a private foundation, a five-member delegation from the DPRK also attended the meeting, providing presentations and insights of their own on energy use in DPRK buildings, and on related energy sector problems and plans in the DPRK.

Presentations:
Presentation: North Korea’s Mineral Resources and Inter-Korean Cooperation
By Woo-jin Chung

Presentation: Nautilus Institute’s Analysis of the DPRK Energy Sector and DPRK Energy Paths: Update
By David von Hippel

Presentation: Analysis on DPRK Power Sector Data & Interconnection Option
By Yoon Jae-young

Presentation: DPRK Energy and Energy-Related Trade with China: Trends Since 2005
By Nate Aden

Uranium enrichment verification in the DPRK

Tuesday, May 6th, 2008

According to an article in the Associated Press today (reprinted in the Washington Post):

The U.S. has recently stepped back from its demand for a detailed declaration addressing North Korea’s alleged secret uranium enrichment program and nuclear cooperation with Syria; North Korea has denied those allegations. Washington now says it wants North Korea to simply acknowledge the concerns and set up a system to verify that the country does not conduct such activities in the future.

How can any uranium enrichment verification plan be implemented in the DPRK?  One solution was proposed to me by Glyn Ford, a member of the European Parliament, when I met him in Beijing last March.  His idea was this: Any uranium enrichment program would require a colossal amount of electricity delivered at a consistent voltage.  So one way the west could monitor if such a program was taking place would be to keep tabs on the North Korean power grid for suspicious spikes in activity or to build voltage fluctuations into the power supply.

Read the full article here:
US official to travel to NKorea
Associated Press (Printed in the Washington Post)
Foster Klug
5/6/2008

CIA briefs Congress on Syria’s nuclear reactor.

Saturday, April 26th, 2008

UPDATE: Here is the CIA video that was released (YouTube).

nuclear.JPG

From today’s Washington Post:

A video taken inside a secret Syrian facility last summer convinced the Israeli government and the Bush administration that North Korea was helping to construct a reactor similar to one that produces plutonium for North Korea’s nuclear arsenal, according to senior U.S. officials who said it would be shared with lawmakers today.

The officials said the video of the remote site, code-named Al Kibar by the Syrians, shows North Koreans inside. It played a pivotal role in Israel’s decision to bomb the facility late at night last Sept. 6, a move that was publicly denounced by Damascus but not by Washington.

Sources familiar with the video say it also shows that the Syrian reactor core’s design is the same as that of the North Korean reactor at Yongbyon, including a virtually identical configuration and number of holes for fuel rods. It shows “remarkable resemblances inside and out to Yongbyon,” a U.S. intelligence official said. A nuclear weapons specialist called the video “very, very damning.” (Washington Post)

What has been the level of cooperation between Syria and the DPRK?

But beginning today, intelligence officials will tell members of the House and Senate intelligence, armed services and foreign relations committees that the Syrian facility was not yet fully operational and that there was no uranium for the reactor and no indication of fuel capability, according to U.S. officials and intelligence sources.

David Albright, president of Institute for Science and International Security (ISIS) and a former U.N. weapons inspector, said the absence of such evidence warrants skepticism that the reactor was part of an active weapons program.

“The United States and Israel have not identified any Syrian plutonium separation facilities or nuclear weaponization facilities,” he said. “The lack of any such facilities gives little confidence that the reactor is part of an active nuclear weapons program. The apparent lack of fuel, either imported or indigenously produced, also is curious and lowers confidence that Syria has a nuclear weapons program.”

U.S. intelligence officials will also tell the lawmakers that Syria is not rebuilding a reactor at the Al Kibar site. “The successful engagement of North Korea in the six-party talks means that it was unlikely to have supplied Syria with such facilities or nuclear materials after the reactor site was destroyed,” Albright said. “Indeed, there is little, if any, evidence that cooperation between Syria and North Korea extended beyond the date of the destruction of the reactor.”

Syria denies it was building nuclear facilities.

Read the full article here:
N. Koreans Taped At Syrian Reactor
Washington Post
Robin Wright
4/24/2008; Page A01

Glyn Ford’s nuclear solution…

Thursday, March 27th, 2008

(Posted from Shanghai, China - I am on vacation, so this is just a quick note)

While in Beijing a few days ago, I ran into Glyn Ford giving a talk in conjunction with the release of his new book, North Korea on the Brink.

Mr. Ford was on his way to Pyongyang to pitch an idea he believes could resolve the HEU (Highly-Enriched Uranium) impasse, which is bogging down implementation of the most recent version of the Agreed Framework.

His idea is this:

Even if the North Koreans have an HEU program it would require a colossal amount of electricity delivered in a consistent fashion.  So one way the west could monitor if such a program was taking place would be to keep tabs on the North Korean power grid for suspicious activity, or to build in fluctuations to the power supply so that the machinery which does the enriching is not able to function.

If both sides can know that there is currently no HEU program underway, then maybe they can avoid the politicalty trecherous waters of determining whether such a program once existed–allowing us all to move on to the next phases of the agreement.

IFES DPRK monthly recap: January 2008

Tuesday, February 5th, 2008

Institute for Far Eastern Studies (IFES)
NK Brief No. 08-2-5-1
2/5/2008

Kim Jong Il’s first visit of the year was reported on January 6 to have been to the Ryesonggnang hydro-electric power plant. Generally, the leader’s visits in the first months of the year, along with the New Year’s Joint Editorial, which focused on economic recovery, set the tone for the coming year’s policies. His second inspection of the year was to a military unit.

Defectors claim that prostitution is on the rise in North Korea, and on January 9, the aid group ‘Good Friends’ reported that the DPRK has begun to close massage parlors as part of a crackdown on prostitution. The agency reported that in the DPRK there was a “steady campaign to weed out decadent foreign culture,” and that in September, DPRK soldiers were ordered to avoid alcohol, sex, and money.

On January 16, it was reported that Kim Jong Il had instructed all DPRK institutions to reduce their bureaucracies, including senior staff, by thirty percent.

Figures released by North Korea’s Korean Central News Agency indicate that the DPRK’s population had increased to 23.6 million in 2004, the latest available figures. According to DPRK figures, the population has grown from 22.1 million in 1996.

North Korea announced the closure of its Australian embassy on January 22. While the DPRK will continue to maintain diplomatic relations with Australia, it apparently can no longer afford to maintain an embassy in Canberra.

According to a report released by the International Red Cross, North Korea has the largest number of people in the world killed by natural disasters over the past decade. The report states that 458 thousand North Koreans have died from natural disaster, 38 percent of the disaster-caused deaths in 220 countries from 1997-2006.

A U.S. Senate investigation reported that the DPRK funneled as much as 2.7 million USD through a bank account set up from UN development projects. The report stated that North Korea used the UN account due to fears that the United States would block its ability to transfer money internationally.

DPRK Nuclear Negotiations

2008 opened with the United States and Japan releasing statements expressing their disappointment at North Korea’s failure to meet its December 31 deadline to fully disclose the extent of its nuclear programs, while North Korea’s New Year’s Joint Editorial called for “stability on the Korean Peninsula and peace in the world” as well as an end to hostile U.S. policies. A U.S. White House spokesman stressed that there was still opportunity to move forward with negotiations, stating, “the important thing is that we get a declaration that…needs to be full and complete,” not whether the declaration is made by the deadline.

On January 4, North Korea claimed it had met its obligations to come clean on its nuclear programs, and that it had provided Washington with a list of its nuclear programs in November. Pyongyang also threatened to bolster its “war deterrent” because Washington had failed to provide promised aid following the declaration. Washington denied that any complete declaration had been made.

A senior Russian diplomat was quoted on January 11 as saying that while Russia regrets the slowed state of progress in talks on DPRK nuclear issues, Russia will fulfill its promise to provide the North with fuel oil. 50,000 tons of fuel oil were delivered on January 20~21.

According to a book of figures recently published by the National Statistical Office, ”Comparison of North and South Korean Socio-economic Circumstances”, the DPRK’’s crude imports over the past several years bottomed out at 2,325,000 barrels in 1999, then rose to 4,244,000 barrels by 2001. Since 2001, imports have steadily fallen until only 3,841,000 barrels were imported in 2006, recording the least imports in the last five years.

North Korea opened its first online shopping mall in January. The site offers items from fourteen categories ranging from machinery and building materials to stamps and artworks. The site, www.dprk-economy.com/en/shop/index.php, is based in China.

Orascom Telecom, a Cairo-based phone operator, has been granted the first commercial license for provision of mobile phone services in North Korea. The license was granted to CHEO Technology, a subsidiary that is 25 percent-owned by the state-run Korea Post and Telecommunications Corporation.

DPRK Abduction Issue

The Cambodian Foreign Minister announced on January 16 that his country had been working behind the scenes to find a resolution to the DPRK-Japan abduction issue. The minister stated, “Cambodia is in a position where it can hold high-level meetings with North Korea, and it has the ability to persuade North Korea.”

Inter-Korean Affairs

The incoming Lee Myung-bak administration announced on January 4 a plan to develop an international cooperative fund to support North Korea’s economy. The plan is said to call for World Bank and the Asia Development Bank to help, and for South Korea to provide 40 billion USD.

On January 7, it was reported that Lee Myung-bak’s presidential transition team had asked the ROK Unification Ministry to slow the pace of inter-Korean economic projects and to link them to progress in the six-party talks. The incoming administration has promised not to link humanitarian projects such as rice and fertilizer aid to nuclear negotiations.

The Lee Myung-bak administration announced plans for downsizing the South Korean government, including disbanding of the Ministry of Unification. Opposition to the plan points out the role played by the ministry in improving inter-Korean relations, while proponents to the plan of relegating the ministry’s duties to the Ministry of Foreign Affairs and Trade applaud the move to align North Korea policy with standing foreign policy directives.

On January 14, it was reported that Lee Myung-bak had asked the United States to further engage in talks with DPRK military leaders, while presenting a balanced approach, stating that “our people don’t support the idea of giving lavish aid to the North nor do they want to irritate it too much, I believe.” He went on to add that the United States holds the key to easing DPRK fears of opening up.

The net worth of inter-Korean exchanges totaled 1,797,890,000 USD in 2007, up 33% from the 1.35 billion USD in the previous year. The almost 1.8 billion dollars in trade recorded in 2007 is the highest to date, and is equal to 65 percent of the DPRK’’s non-Korean trade volume of 2.996 billion USD in 2006.

The Seoul-based International Vaccine Institute announced on January 14 that it will soon begin inoculating approximately six thousand North Korean children against bacterial meningitis and Japanese encephalitis.

The two Koreas began working-level military talks on January 25, marking the first talks of the year. During talks, the North proposed reducing the frequency of the inter-Korean rail services, citing a lack of cargo. The Southern delegation felt that the frequency was an important indication of inter-Korean cooperation. The two sides agreed to continue daily runs, but to reduce the number of empty carriages in the future.

North Korea is still not as attractive to businesses as other Asian neighbors. A survey released by the (South) Korea Chamber of Commerce and Industry on January 28 indicated that China and Vietnam are more attractive to ROK businesses. According to the survey, 80 percent of businesses have difficulties starting or operating businesses in North Korea.

An ROK special envoy returned on January 23 from Moscow after proposing a joint ROK-DPRK-Russian cooperative project in eastern Siberia. President-elect Lee Myung-bak sent a letter to Russian President Vladimir Putin pushing for cooperation of “North Korea’s workforce, Russia’s resources and capital, and [South] Korean technology.”

U.S.-DPRK Relations

On January 9, amidst reports concerning possible DPRK-Syria nuclear connections, it was reported that in 1991 Israel was posed to strike a ship suspected of delivering missiles from the DPRK to Syria, but was dissuaded by Washington.

A U.S. State Department official stated on January 22 that North Korea had met the legal criteria to be removed from the U.S. list of state sponsors of terrorism. This came just after reports of conflicting opinions within the Bush administration, with Secretary of State Condoleezza Rice sharply rebuking Special Envoy on North Korean Human Rights Lefkowitz, who stated that North Korea is not serious about nuclear disarmament. Rice went so far as to say that Lefkowitz “certainly has no say on what American policy will be in the six-party talks,” dismissing his negative position on the failure of North Korea to meet its obligations. The White House later stated that North Korea must make a full declaration of its nuclear activities before being removed from the list.

Five officials from the DPRK recently visited the United States in order to learn how to treat and prevent tuberculosis, a serious concern for the North that is “practically non-existent in most developed countries.” The officials were invited by The Korea Society, which is based in New York.

DPRK-PRC Relations

According to the PRC General Administration of Customs, China’s oil exports to North Korea were the same in 2007 as they were in 2006. China sent 523,160 tons of oil to North Korea in 2007.

A senior PRC Communist Party official traveled to Pyongyang for a meeting with Kim Jong Il on January 30. Wang Jiarui, director of the International Liaison Department of the Chinese communist party, was to convey a message to Kim, inviting him to the opening ceremony of the Beijing Olympics. While Kim reportedly told Wang that there would be no change in the DPRK stance on nuclear negotiations, he also assured the Chinese envoy that North Korea had no intention of harming DPRK-PRC relations.

Cancor Report #297: Knowledge Sharing with the DPRK

Sunday, January 27th, 2008

November 12, 2007

The latest edition of the CanKor Report has only one longer-than-usual item.  It is the preparatory document of a workshop recently held in Seoul, Korea, in which NGOs, academics, practitioners and diplomats from Europe, Asia, Australia and North America consulted about the prospects for international cooperation regarding education and training programmes that need to be undertaken with the DPRK if denuclearization proceeds according to the Six-Party timetable.  Experts in economic development believe that the next step in international engagement will have to be the building up of DPRK expertise and intellectual capacity to absorb the significant development assistance that may follow successful completion of the Six-Party process. In this working paper, loyal CanKor reader and former World Bank official Bradley Babson defines “knowledge sharing”, explains why the time is ripe for all sectors to become involved, outlines potential pitfalls, and suggests guiding principles for future engagement by the international community.
*************************************************

Contents:

1.   KNOWLEDGE SHARING WITH THE DPRK
    Bradley O. Babson, CanKor original
       Introduction
       Why knowledge sharing?
       Strategic considerations
       DPRK internal challenges
       Nuclear politics
       Inter-Korean reconciliation
       China, Russia and Northeast Asia regional perspectives
       Operational challenges in the DPRK context
       An underlying tension
       Relationships
       Information
       Absorptive capacity
       Coordination
       Resources
       International experience and best practices
       Conclusions and principles for future engagement
*************************************************

(more…)

North Korea Google Earth (Version 7)

Friday, December 14th, 2007

The most authoritative map of North Korea on Google Earth
North Korea Uncovered v.7
Download it here

koreaisland.JPGThis map covers North Korea’s agriculture, aviation, cultural locations, manufacturing facilities, railroad, energy infrastructure, politics, sports venues, military establishments, religious facilities, leisure destinations, and national parks. It is continually expanding and undergoing revisions. This is the sixth version.

Additions to the latest version of “North Korea Uncovered” include: A Korean War folder featuring overlays of US attacks on the Sui Ho Dam, Yalu Bridge, and Nakwon Munitians Plant (before/after), plus other locations such as the Hoeryong Revolutionary Site, Ponghwa Revolutionary Site, Taechon reactor (overlay), Pyongyang Railway Museum, Kwangmyong Salt Works, Woljong Temple, Sansong Revolutionary Site, Jongbansan Fort and park, Jangsan Cape, Yongbyon House of Culture, Chongsokjong, Lake Yonpung, Nortern Limit Line (NLL), Sinuiju Old Fort Walls, Pyongyang open air market, and confirmed Pyongyang Intranet nodes.

Disclaimer: I cannot vouch for the authenticity of many locations since I have not seen or been to them, but great efforts have been made to check for authenticity. These efforts include pouring over books, maps, conducting interviews, and keeping up with other peoples’ discoveries. In many cases, I have posted sources, though not for all. This is a thorough compilation of lots of material, but I will leave it up to the reader to make up their own minds as to what they see. I cannot catch everything and I welcome contributions.

N. Korea upbeat about economic future as relations with U.S. thaw

Tuesday, November 13th, 2007

Yonhap
11/13/2007

North Korea Tuesday expressed confidence in the recovery of its ailing economy devastated by years of mismanagement, economic embargoes and floods as multilateral talks on the North’s nuclear disarmament make progress.

“The circumstances for our revolution are changing in a very favorable way,” Rodong Sinmun, the organ of North Korea’s ruling Workers’ Party, said in an editorial. “The international prestige of the country is rising extraordinarily, and our economy is vigorously bouncing back with enormous energy.”

Pyongyang’s upbeat mood comes as Washington is moving to take the communist country off its list of terrorism-sponsoring countries and to lift its trading ban on condition that the North completes the disablement of its nuclear facilities and declares its nuclear programs by the end of the year under an agreement signed in early October.

North Korea started disabling its nuclear facilities in Yongbyon, north of Pyongyang, in early November.

In return for its actions, North Korea will receive 1 million tons of energy assistance from the other parties of the deal, including South Korea, the U.S., China, Japan and Russia.

The North has already received 100,000 tons of heavy fuel oil from South Korea and China. The end of the application of the U.S. Trading with the Enemy Act to the North will allow the communist state to participate in international economic activities.

“Only when we thoroughly achieve the combatant work in front of us this year, can we make a breakthrough for a new march toward the construction of economic power and decisively engage in next year’s combat,” the newspaper said.

Recent reports have painted a bleak picture of the North Korean economy. According to figures released by South Korea’s Bank of Korea, the North’s economy probably shrank 1.1 percent in 2006 compared to a year earlier because of the weakness of its agricultural and construction sectors. The decease in North Korea’s gross domestic product was a reversal of the 3.8 percent expansion in 2005 and the 6.2 percent rise in 1999.

Google Earth North Korea (version 6)

Sunday, November 11th, 2007

The most authoritative map of North Korea on Google Earth
North Korea Uncovered: Version 6
Download it here

kissquare.JPGThis map covers North Korea’s agriculture, aviation, cultural locations, manufacturing facilities, railroad, energy infrastructure, politics, sports venues, military establishments, religious facilities, leisure destinations, and national parks. It is continually expanding and undergoing revisions. This is the sixth version.

Additions to the newest version of North Korea Uncovered include: Alleged Syrian nuclear site (before and after bombing), Majon beach resort, electricity grid expansion, Runga Island in Pyongyang, Mt. Ryongak, Yongbyon historical fort walls, Suyang Fort walls and waterfall in Haeju, Kaechon-Lake Taesong water project, Paekma-Cholsan waterway, Yachts (3), and Hyesan Youth Copper Mine.

Disclaimer: I cannot vouch for the authenticity of many locations since I have not seen or been to them, but great efforts have been made to check for authenticity. These efforts include pouring over books, maps, conducting interviews, and keeping up with other peoples’ discoveries. In many cases, I have posted sources, though not for all. This is a thorough compilation of lots of material, but I will leave it up to the reader to make up their own minds as to what they see. I cannot catch everything and I welcome contributions.

N. Korea Offers Evidence to Rebut Uranium Claims

Saturday, November 10th, 2007

Washington Post
By Glenn Kessler
11/10/2007
Page A01

North Korea is providing evidence to the United States aimed at proving that it never intended to produce highly enriched uranium for nuclear weapons, undermining a key U.S. intelligence finding, South Korean and U.S. officials said this week.

In closely held talks, the North Korean government has granted U.S. experts access to equipment and documents to make its case, in preparation for declaring the extent of its nuclear activities before the end of the year. North Korean officials hope the United States will simultaneously lift sanctions against Pyongyang as the declaration is made.

If North Korea successfully demonstrates that U.S. accusations about the uranium-enrichment program are wrong, it will be a blow to U.S. intelligence and the Bush administration’s credibility.

The U.S. charges of a large-scale uranium program led to the collapse of a Clinton-era agreement that had frozen a North Korean reactor that produced a different nuclear substance — plutonium. That development freed North Korea to use the plutonium route toward gathering the material needed for a nuclear weapon. Pyongyang conducted its first nuclear test last year, detonating a plutonium-based device, and has built a plutonium stockpile that experts estimate could yield eight to 10 nuclear weapons.

“They have shown us some things, and we are working it through,” a senior U.S. official said yesterday, speaking on the condition of anonymity because the talks are confidential. “We are having a discussion about things. Some explanations make sense; some are a bit of a stretch.”

“This is now in the process of being clarified,” a senior South Korean official said in an interview. “The North Koreans are now ready to prove that they did not intend to make a uranium-enrichment program by importing some materials.”

He said North Korea is attempting to show that the materials it imported — including 150 tons of aluminum tubes from Russia in June 2002 — were intended for conventional weapons programs and other dual-use projects, not for weapons of mass destruction.

The South Korean official said North Korea’s efforts mark an important shift. “In the past, North Korea simply said no,” he said. “Now they are trying to convince us.”

U.S. intelligence first concluded in July 2002 that North Korea had embarked on a large-scale program to produce highly enriched uranium for use in weapons, saying it was constructing a facility that would be fully operational by 2005. “We discovered that, contrary to an agreement they had with the United States, they’re enriching uranium, with a desire of developing a weapon,” President Bush said in a November 2002 news conference.

U.S. officials have also asserted that a senior North Korean official admitted the existence of the program in an October 2002 meeting in Pyongyang between officials from both nations. North Korea later denied that any such admission took place.

After the administration accused Pyongyang of violating a 1994 agreement struck with President Bill Clinton to freeze its plutonium facilities, North Korea ejected U.N. inspectors from the country and restarted its plutonium reactor, allowing it to stockpile its weapons-grade material.

For years afterward, during the impasse over North Korea’s nuclear ambitions, the Bush administration insisted that North Korea first admit having the uranium facility, rejecting arguments from other nations that it was more important to freeze the plutonium facility in order to halt the nation’s production. After North Korea tested the nuclear device, the administration agreed to a deal in which Pyongyang froze and then disabled the plutonium facility in exchange for international aid.

Plutonium and highly enriched uranium provide different routes to building nuclear weapons. The North Koreans were able to reprocess 8,000 spent fuel rods — which had been held in a cooling pond and monitored by U.N. inspectors under the 1994 agreement — to acquire the weapons-grade plutonium. A uranium program would have required Pyongyang to build a facility with thousands of centrifuges to obtain the highly enriched uranium needed for a weapon. Iran’s nuclear program, which the United States alleges is intended for weapons, involves enriched uranium.

The administration this year began to back off its earlier assertions that North Korea has an active program to enrich uranium. In February, the chief U.S. intelligence officer for North Korea, Joseph R. DeTrani, told Congress that while there is “high confidence” that North Korea acquired materials that could be used in a “production-scale” uranium program, there is only “mid-confidence” that such a program exists.

David Albright, a former U.N. inspector and president of the Institute for Science and International Security, said in a report this year that there is “ample evidence” that North Korea was trying to put together a small-scale research program involving a few dozen centrifuges but that claims of a large-scale effort were flawed.

Albright said yesterday that the tubes acquired by North Korea needed to be cut in half and shaped in order to be used as the outer casings of centrifuges. If Pyongyang proves that the tubes were untouched, he said, it could “shatter the argument” that they were meant for a uranium program.

But Albright said it is difficult to see how North Korea could explain away a set of centrifuges that Pakistani President Pervez Musharraf said a Pakistani nuclear-smuggling network provided to Pyongyang. “I think the North Koreans are making a big mistake” if they deny they had any interest in uranium enrichment, he said. “They are going to create a lot of trouble if they stick to this.”