2018年10到12月份 ~~ 美中兩國合作,讓核材料遠離恐怖組織


https://www.defensenews.com/news/pentagon-congress/2019/01/14/how-the-us-and-china-collaborated-to-get-nuclear-material-out-of-nigeria-and-away-from-terrorist-groups/#

How the US and China collaborated to get nuclear material out of Nigeria — and away from terrorist groups

By: Aaron Mehta

January 14

Photo by Issouf Sanogo/AFP via Getty Images; Illustration by Brandon-Mykal Rambus/Staff

WASHINGTON — At a staging ground in Ghana, a group of nuclear experts watched the clock and nervously waited for the news.

The team — a mix of American, British, Norwegian and Chinese experts, along with Czech and Russian contractors — were supposed to head into the Kaduna region of Nigeria to remove highly enriched uranium from a research reactor that nonproliferation experts have long warned could be a target for terrorists hoping to get their hands on nuclear material.

But with the team assembled and ready to go on Oct. 20, 2018, the mission was suddenly paused, with the regional governor declaring a curfew after regional violence left dozens dead. As American diplomats raced to ensure the carefully calibrated window of opportunity didn’t shut, the inspectors were unsure if the situation would be safe enough to complete the mission.

“Frankly speaking, yeah, I was nervous for my people on the ground and everyone else who was on the ground. It was important, but we had to go at it in a prudent way” said Peter Hanlon, assistant deputy administrator for material management and minimization, an office within the U.S. National Nuclear Security Administration. “As someone responsible for this organization, I was nervous.”

Moving the nuclear material out of Nigeria has been a long-sought goal for the United States and nonproliferation advocates. But the goal has taken on increased importance in recent years with the rise of militant groups in the region, particularly Boko Haram, a group the Pentagon calls a major terrorist concern in the region.

Underscoring the importance of the operation: the key role China played in transporting and storing the uranium, with the operation happening just hours after U.S. President Donald Trump made an explicit threat to China about growing America’s nuclear arsenal.

For those gathered in Ghana that evening, however, the focus was on watching the clock and hoping that the negotiators could come through and allow them to finally get the material out of Nigeria — and get everyone home safely.

‘Material that is attractive to terrorists’

It was the mid-1990s when Nigeria, with technical support and backing from China, began work on what would become Nigerian Research Reactor 1, located at Ahmadu Bello University in Kaduna. The location opened in 2004, and is home to roughly 170 Nigerian workers.

NIRR-1 is classified as a miniature neutron source reactor, designed for “scientific research, neutron activation analysis, education and training,” per the International Atomic Energy Agency. Essentially, the reactor powers scientific experiments, not the local grid.


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The design, however, used highly enriched uranium, or HEU, a type of nuclear substance often referred to by the general public as weapons-grade uranium. This kind of uranium forms the core of any nuclear weapons material, and the Nigerian material was more than 90 percent enriched, making it particularly attractive for anyone looking to use it.

Since NIRR-1 went online, however, improvements in technology meant that experiments involving highly enriched uranium could now be run with a lesser substance. Across the globe, the IAEA and its partners have worked to swap out weapons-grade material with low enriched uranium, or LEU, which is enriched at less than 20 percent, and hence unusable for weapons. In all, 33 countries have now become free of HEU, including 11 countries in Africa.

With just over 1 kilogram of HEU, the Nigerian material, if stolen, would not be nearly enough to create a full nuclear warhead. However, a terrorist group would be able to create a dirty bomb with the substance or add the material into a stockpile gathered elsewhere to get close to the amount needed for a large explosion.

In a statement released by the IAEA, Yusuf Aminu Ahmed, director of the Nigerian Centre for Energy Research and Training, was blunt about his concerns over keeping the weapons-grade material in his country. “We don’t want any material that is attractive to terrorists," he said.

And the nature of these types of reactors, used primarily for research, means they are ideal targets for terrorist groups looking for nuclear material, said Jon Wolfsthal, a nuclear expert who served as senior director for arms control and nonproliferation at the U.S. National Security Council from 2014 to 2017.


Recruits undergo training at the headquarters of the Depot of the Nigerian Army in Zaria, Kaduna State in north-central Nigeria, on Oct. 5, 2017. The Nigerian Army train recruits to tackle the threat of the Islamist group Boko Haram. (Pius Utomi Ekpei/AFP via Getty Images)
“They’re small reactors, they’re not power reactors where the fuel is so radioactive it kills you,” he said. “This is very attractive to a proliferation point of view, and they are research reactors, so they are often at universities without high security.”

All of which gave the governments involved incentive to get the material out of Nigeria sooner rather than later, and which led to the group of experts sitting in Ghana, waiting for a call.

The day of

It wasn’t until Oct. 22 — two days after the initial delay — that American diplomats, working with their Nigerian counterparts, were able to get an exemption to the curfew in Kaduna and prepare to roll out. But for security reasons, an operation that usually took days would have to happen in just one 24-hour period.

At 1:30 a.m. on Oct. 23, a Russian Antonov An-124 cargo plane touched down in Nigeria. Aboard were the team of experts, but also a TUK-145/C — a 30-ton cargo container designed specifically for moving such uranium from place to place and doing so securely.

From the outside, the TUK-145/C looks like a large, silver cylinder, designed to keep its precious cargo safe even in the event of a plane crash — as part of the safety testing before certification, the container is put into a pool of jet fuel, with the whole thing then lit on fire for 60 minutes. If you somehow could cut it down the middle, the container would appear to be two parts — an outer shell for security, and an innermost cask containing the spent uranium rods.

Both the plane and the TUK-145/C are owned and operated by the Russian Sosny Research and Development Company, a specialty firm that has been used in other HEU removal procedures.

Loading the equipment off the plane took hours, as did the trip from the airstrip to the reactor. But finally, the team arrived at the reactor around 9 a.m. The group now included U.S. State Department security and Nigeria’s Army First Division, considered a top-end unit of the Nigerian military.

Tiffany Blanchard-Case, a nuclear expert from the National Nuclear Security Administration, was one of the officials on the ground to oversee the transfer. She described a “grueling” day as the team rushed to condense what needed to be done into the secure window.


Technical experts from Nigeria's Centre for Energy Research and Training stand over the miniature neutron source reactor and prepare to load the HEU reactor core into an interim transfer cask. (U.S. National Nuclear Security Administration)
“No one was concerned about breaks, no one was concerned about lunch, everyone was just working 100 percent in order to make sure we could meet this schedule,” she said. “A long day for everyone.”

Getting at the uranium is tricky business. The reactor core, which holds the actual material, is located at the bottom of a six-meter-deep pool. Above the pool, technicians have to create a platform and then center a vessel, known as the interim transfer cask, above the core. The cask contains a grapple, which reaches into the reactor and lifts out the core; when the core is loaded in, a plug is placed over the core and the cask is sealed, loaded onto the Skoda shipping cask, and then that unit is sealed inside the TUK-145/C.

Replacing HEU with LEU in research reactors naturally requires caution, as anything nuclear-related comes with risks. But the Nigerian mission was particularly difficult because of security concerns, Hanlon said. He noted that Boko Haram, while not in the Kaduna region, has been operating in Nigeria for quite some time.

“We had concerns about the security on the ground, in the region. Working very closely with the U.S. embassy, there were additional security requirements put upon us and limitations for us on having people on the ground at the facility itself,” Hanlon said.

Hanlon and Blanchard-Case declined to discuss details of the security, other than to say it was heavy and that the U.S. State Department added extra forces as part of the agreement to allow the team to go in.

Alice Hunt Friend, a regional expert with the Center for Strategic and International Studies, said that Boko Haram is not necessarily “active” in the region, but added that an attack by the group in that area shouldn’t be ruled out.

“The city is a transport hub, pretty much right between Abuja and Kano on the main route. It is also in the belt that has experienced a lot of communal violence over the past 10 years, so I can also imagine that security for HEU sites would be of concern more generally, even absent a specific threat,” she said. “With much of the Nigerian military concentrating on the northeast, I would imagine security for sites in Kaduna is inconsistent.”

Boko Haram is just one threat that worries security teams on the ground, said Peter Haynes, an analyst with the Center for Strategic and Budgetary Assessments.

“Fueled by ethnic and religious differences, there has been lots of violence in the Kaduna region in the last six months, but that has been between Fulani Muslim herders and Christian villagers,” said Haynes, adding that it is not “uncommon as of late to have curfews to dampen the communal violence.”

While the technicians were able to leave the country once their daylong mission was complete, security on site remained thick for the next five weeks as administrators worked the logistics and clearances needed to fly nuclear material over other nations' airspace. Asked about the security level during this down period, Dov Schwartz, an NNSA spokesman, said that “extensive planning went into ensuring the removed highly enriched uranium was safe and secure prior to transport."

"All of our partners understood that operational security was paramount,” Schwartz said. "The world is a safer place today as a result of the determined work to remove this weapons useable Uranium from Nigeria.”

Finally, on Dec. 4, the HEU was escorted by the Nigerian military toward the An-124, loaded onto the aircraft and sent on its way to its final destination.

The material was heading for China.


The TUK-145/C, carrying a load of highly enriched uranium from the Nigerian reactor, is loaded onto a plane headed for its final destination: China. (U.S. National Nuclear Security Administration)
China’s role

The removal operation cost roughly $5.5 million, with the United States contributing $4.3 million. The United Kingdom ($900,000) and Norway ($290,000) also chipped in. But while it didn’t contribute money, China’s role in the operation was outsized — and occurred as the war of words from the Trump administration toward Beijing was reaching a fever pitch, one that did not die down in the weeks to come.

As the October operation was just hours from starting, U.S. President Donald Trump took to the press to discuss nuclear material and China.

“Until people come to their senses, we will build [the nuclear arsenal] up," Trump told reporters just hours before the Nigeria operation was to begin. "It’s a threat to whoever you want. And it includes China, and it includes Russia, and it includes anybody else that wants to play that game. You can’t do that. You can’t play that game on me.”

By the time the Antonov plane — carrying the HEU, along with American inspectors and security — arrived at Shijiazhuang airport in China on Dec. 6, the arrest of a Chinese technology executive in Canada had inflamed fears of a trade conflict between the two countries.

Once the material landed in China, local officials took possession of the uranium, marking the end of the Nigerian mission — but not necessarily the end of the material.

Hanlon acknowledged the United States doesn’t know what China will do with the material, noting they could dispose of it in whatever way they see fit. But Wolfsthal, the former National Security Council staffer, doesn’t think Beijing will let it go to waste.

“My guess is China will reprocess it and then recycle some of the materials,” Wolfsthal said. “It could end up in China’s stockpile after being reprocessed, or used for civilian fuel. But getting it out of Nigeria is the biggest thing.”

In a statement released by the IAEA, Shen Lixin, deputy director general of the department of business development and international cooperation at the China National Nuclear Corporation, said the project “manifests the determination and joint effort of several governments and organizations in preventing nuclear proliferation."


Chinese President Xi Jinping, right, greets Nigerian President Muhammadu Buhari during a plenary session of the 2016 Nuclear Security Summit on April 1, 2016, in Washington, D.C. The summit was organized to highlight accomplishments and make new commitments toward reducing the threat of nuclear terrorism. (Alex Wong/Getty Images)
“This is also a demonstration of CNNC’s meeting its social responsibilities and the commitment to peaceful uses of nuclear energy,” the statement continues. “CNNC is more than willing to work together and cooperate whole heartedly with relevant parties to facilitate other MNSR conversion projects.”

That the United States and China were able to ignore politics to get the HEU removal done shouldn’t be a surprise, Wolfsthal said. Traditionally, countries that supply uranium to partners around the world take that material back if needed.

“Even though the national level conversation is really poor because of trade and other issues, the technical collaboration between laboratories, between nuclear engineers, that’s generally gone pretty well,” he said. He added that China has invested heavily in LEU over the last decade, and therefore also has an interest in encouraging others to switch to that technology.

Whether that cooperation continues if relations between the two nations continue to deteriorate will be a true test going forward. On Jan. 3, the U.S. State Department issued a travel warning for China, urging American citizens to use caution when traveling, as the Chinese government may detain Americans.

And an agreement to develop new nuclear technology between CNNC and TerraPower, an American nuclear firm led by Microsoft founder Bill Gates, appears doomed due to American restrictions on technology sharing with China.

Hanlon, for his part, is optimistic that China and the U.S. will continue to work on nuclear security.

“These nuclear security efforts of removing this dangerous material, most countries agree with that,” he said. “That work has continued unabated.”
最近美國的NASA也找中國航天局合作


從封鎖數據到尋求合作美國為何要藉我們的“鵲橋”中繼星

2019-01-21 07:16:24 來源: 科技日報 作者: 付毅飛

本報記者 付毅飛

在國新辦近日舉行的嫦娥四號任務新聞發布會上,國家航天局副局長、探月工程副總指揮吳艷華介紹,此次任務中,中美雙方開展了積極合作,利用正在月球軌道上運行的美國月球觀測衛星(LRO)對嫦娥四號探測器進行了觀測。

中國工程院院士、中國探月工程總設計師吳偉仁此前向媒體透露,得知中國要發射“鵲橋”中繼星並探測月背時,美國科學家向中方提出了多項合作請求。

曾多次進行數據封鎖

多年來美國對中國航天一直是排擠的。據報導,2011年美國國會通過“沃爾夫條款”,禁止NASA未經國會明確批准同中國進行任何形式的合作,並禁止NASA所有設施接待中國官方訪問者。

此外,我國於2010年10月發射的嫦娥二號探測器,在完成為期半年的繞月探測後,實施了一系列拓展任務,包括對圖塔蒂斯小行星進行飛躍探測等。吳偉仁曾回憶,世界上很多小天體的軌道只有美國掌握,原本向全球公開。但當我國宣布要探測圖塔蒂斯小行星後,美國立即關閉了相關軌道數據。我們被這個舉動搞得十分被動,但還是集中全國天文台的力量找到了圖塔蒂斯、制定了軌道,最後成功完成探測任務。

LRO與嫦娥四號擦肩而過

2013年我國實施嫦娥三號任務前夕,美方多次致電,要求我國提供嫦娥三號的軌道數據和落月時間等,但並未如願。此次任務,美方則希望嫦娥四號搭載信標機,幫助他們獲得在月背著陸的具體位置。

遺憾的是,美國衛星沒能見證這一過程。吳艷華說,嫦娥四號著陸的時候,LRO不在其上空,不能實時監測。

中國航天科工集團二院研究員楊宇光認為,雙方都表現出了合作的態度。在前期溝通過程中,美方將LRO衛星的軌道數據提供給中方,並承諾公開拍攝的圖像和參數。我國也提前告知了嫦娥四號著陸相關信息。只可惜兩家窗口沒對上,LRO所剩燃料也很有限,無法調整軌道過去觀測。不過楊宇光錶示,雖未達到科學目標,此舉也具備一定工程意義。

此外,美國還提出另一項請求,希望我國把“鵲橋”中繼星的設計壽命由3年延長到5年。吳偉仁說:“美方表示,他們準備到月球背面去,希望到時也能利用這顆中繼星。”

造顆中繼星對美國來說並不難

美國為什麼不自己造一顆中繼星打上去?這就好比你飢腸轆轆時,附近只有一家你平時不喜歡的餐館,是先進去填飽肚子,還是花錢買菜、自己下廚?美國選擇了前者。

“鵲橋”中繼星擁有極高的技術含量,例如其運行軌道。我國曾用嫦娥二號探測器,以及探月工程三期再入返回飛行器的留軌服務艙,分赴日地拉格朗日2點和地月拉格朗日2點為其“探路” 。為了在復雜且極不穩定的Halo軌道上控制衛星,中國航天科技集團五院攻克了大量軌道控制技術,對飛行速度達每秒1公里的衛星,實現了速度增量誤差不大於每秒0.02米的控制精度。

但以美國目前的技術,研製一顆中繼星送入該軌道並不是很難的事。

因此楊宇光認為,美國並不是不會“下廚”,而是想節省“買菜錢”。如果美國自行研製一顆中繼星,加上發射、運營,花費至少要上億美元。NASA現在預算緊張,向中國尋求合作顯然划算得多。

當然,美國提出合作也是基於對“鵲橋”以及中國航天的認可。楊宇光說,例如他們的探測器設計,也要參照“鵲橋”標準,符合通信容量、回傳碼速率等特點。

按照美國提出的中繼星延壽要求來看,他們至少計劃在5年內實施月背登陸。無論此項合作最終能否開展,中國航天都將向世界敞開胸懷。

nomo333 wrote:
https://www...(恕刪)


怎麼一樓跟二樓講得差這麼多......
其实是国际合作
几大流氓在清理没人罩的潜在拥核国家时还是很团结的
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