* 搜尋
* 核能資訊中心
* 中心簡介
* 相關資訊
* 瀏覽人數
今天: 13486
昨天: 19414
本月: 427669
總計: 1219878
國際核能現況 : USA awards HEU downblending contract
發表人 nicenter 於 2018/10/3 9:46:54 (50 人讀取)

USA awards HEU downblending contract

BWX Technologies Inc subsidiary Nuclear Fuel Services Inc (NFS) has been awarded a USD505 million contract for the downblending of 20.2 tonnes of highly enriched uranium (HEU) to low enriched uranium (LEU), the largest single downblending contract in NFS's history.

Watts Bar (Image: TVA)

NFS is to provide downblending services to the Tennessee Valley Authority (TVA) under the six-year contract, with work expected to begin in early 2019 and continue until mid-2025. The work supports the objectives of the US Department of Energy National Nuclear Security Administration's (NNS) defence programmes.

Downblending involves mixing HEU with natural uranium to make LEU, which can then be used be used as fuel in commercial reactors. The LEU can also be used for national defence purposes including the production of tritium, a key component of the USA's nuclear weapons stockpile. The isotope has a relatively short half-life of 12.3 years and decays at a rate of about 5.5% per year, so must be periodically replenished to maintain the designed capability of the weapons.

The USA's supply of tritium is produced by the irradiation of lithium-containing rods, known as tritium producing burnable absorber rods, in the core of the TVA's Watts Bar unit 1 reactor. As the tritium is used for military purposes, the reactor producing it must be fuelled by so-called unobligated LEU - that is, material that is free from peaceful use restrictions. The uranium, technology and equipment used to produce it must therefore be of US origin.

The NNSA is responsible for securing supplies of unobligated LEU for the US programme, but the USA has had no uranium enrichment capability to produce unobligated LEU since the 2013 closure of the Paducah enrichment plant. It must therefore be produced by downblending HEU from DOE's inventories.

BWXT President and CEO Rex Geveden said the contract award "speaks to the truly unique capabilities in nuclear materials processing at BWXT and edifies one of our key lines of business".

The NNSA and TVA in August announced an interagency agreement for a downblending campaign running from 2019 to 2025, with TVA providing material management and storage logistics through to 2040.

Researched and written by World Nuclear News

source: http://www.world-nuclear-news.org/Articles/US-awards-HEU-downblending-contract

2019/2/20 10:18:29 - Public hearing for Whiteshell licence renewal
2019/2/20 10:16:05 - Russia's Kola plant completes second WANO review
2019/2/20 10:09:05 - 回應環團抗議興達電廠更新計畫 台電:減開發增綠地 救空氣護溼地立場一致
2019/2/20 10:07:34 - 核二未來面臨燃料池滿 新北稱「目前尚有空間」 台電:避重就輕、張飛打岳飛
2019/2/18 10:18:09 - NRC seeks input on legacy uranium cleanup
2019/2/18 10:14:08 - BP forecasts nuclear growth to 3400 TWh by 2040
2019/2/18 10:11:32 - Melted fuel photographed at Fukushima
2019/2/18 10:09:53 - Search for UK repository site resumes
2019/2/15 13:56:22 - NRC terminates US MOX plant authorisation
2019/2/15 13:54:09 - Foratom highlights role of nuclear in meeting EU's target






30013 新竹市光復路二段101號 北育成三樓309室 電話:(03)571-1808 傳真:(03)572-5461 Email: nicenter[@]nicenter.org.tw