* 搜尋
* 核能資訊中心
* 中心簡介
* 相關資訊
* 瀏覽人數
今天: 1349
昨天: 761
本月: 5905
總計: 559758
國際核能現況 : NEI calls for reform to design certification process
發表人 nicenter 於 2017/10/18 14:17:27 (169 人讀取)

The Nuclear Energy Institute (NEI) has called on US regulators to reform its reactor design certification process by removing an extra tier of information designations it describes as unnecessarily burdensome. The NEI says five years of experience at US construction projects have shown Tier 2* designations reduce flexibility while imposing additional burdens and complexity on both licensee and regulator, without adding any safety benefit.

The Washington, DC-based organisation has submitted a 32-page letter to US Nuclear Regulatory Commission (NRC) chairman Kristine Svinicki in which it calls for elimination of Tier 2* designations in the design certification process. The letter, signed by NEI vice president and acting chief nuclear officer Joseph Pollock, follows an initial recommendation to eliminate the designation made by the NEI to the NRC in 2014.

The NRC's process for the certification and construction of new reactors, under regulation 10 CFR Part 52, was introduced in 1989. The regulator subsequently approved the use of two tiers of design-related information and established separate procedures for signing off on any changes to that information, depending on the safety relevance of the changes.

Vogtle 3's second steam generator was lifted into place on 10 October. Experience at the AP1000 project has demonstrated the additional burden imposed by Tier 2*, NEI says. (Image: Georgia Power)

Tier 1 information is considered to be more safety-relevant, with any changes requiring prior approval from the NRC. Changes to Tier 2 information can be made without prior NRC approval, provided that safety-focused criteria are met, in a similar process to the "50.59-like" process that is used in the operating nuclear fleet.

Tier 2* was introduced into the design certification process in the early 1990s, with the intention of minimising the scope of Tier 1 information. Like Tier 1 information, any design certification information with a Tier 2* designation requires prior NRC approval via a licence amendment for any changes, regardless of the safety significance of the change. Unlike Tier 1 information, changes to Tier 2* information do not require an exemption to the existing design certification.

Tier 2* should, in theory, have provided greater flexibility in making changes to information but in practice the level of effort required for changes to Tier 1 and Tier 2* information is nearly identical, NEI said.

Experience over the past five years at two AP1000 construction projects - Summer units 2 and 3 and Vogtle units 3 and 4 - has demonstrated the additional burden and additional costs imposed because of the Tier 2* designation as well as the potential that "emergent Tier 2* issues" could cause "needless" construction delays, the letter notes.

"An updated assessment of Tier 2* experience has shown that approximately 30% of licence amendment requests were required solely because of changes to Tier 2* information. Of those changes, approximately 90% would not have required an amendment if a '50.59-like' change process could be applied," Pollock said. The remainder would have required a licence amendment under the 50.59-like process in any case, so the Tier 2* designation was "duplicative and unnecessary", he said.

"Elimination of Tier 2* is a step that can and should be taken today to immediately benefit design certification applicants and to demonstrate timely, effective response to regulatory lessons learned," Pollock told the NRC.

Of the USA's two A1000 projects only Southern Company's Vogtle 3 and 4, in Georgia, remain under construction. Pollock urged the NRC to act "expeditiously" with Southern Company to identify the most timely and efficient course to relieve the project of "the continued unnecessary burden of Tier 2*".

David Jones, vice president of technical compliance at Southern Company subsidiary Georgia Power, said the company supported the NEI's effort to remove Tier 2* from future design certification applications. Near-term relief from the Tier 2* change process for Vogtle 3 and 4 would improve industry and regulator focus on "those aspects of construction which are truly safety-significant" without compromising NRC oversight, he said.

Researched and written
by World Nuclear News


2018/12/14 9:35:45 - IAEA reviews long-term safety of Armenian plant
2018/12/14 9:28:55 - Major concrete pour at Hinkley Point C
2018/12/14 9:25:47 - Indian reactor sets new world record
2018/12/14 9:23:04 - Novovoronezh unit 4 completes upgrade
2018/12/14 9:17:12 - 今(14)日4時56分花蓮縣政府西北方12.4公里規模3.5有感地震,各核能電廠皆正常運作,原能會持續監控電廠運轉安全
2018/12/12 9:32:00 - Work starts on Kursk II-2 foundation plate
2018/12/12 9:29:31 - Optimisation studies begin at Namibian uranium mine
2018/12/12 9:26:06 - South African government replaces Necsa board
2018/12/12 9:24:27 - Nigeria becomes HEU free
2018/12/12 9:21:47 - Fuqing 6 reactor pressure vessel in place
2018/12/10 9:24:45 - Fusion reactions project attracts UK funding
2018/12/10 9:22:58 - China General Nuclear ready to ramp up UK ambitions
2018/12/10 9:21:22 - Diversity key for UK nuclear workforce strategy
2018/12/10 9:19:35 - Optimisation studies begin at Namibian uranium mine
2018/12/7 10:41:45 - Nuclear important to sustainable energy mix, says UNECE report
2018/12/7 10:40:07 - First Taiwanese reactor to enter decommissioning
2018/12/7 10:31:03 - Russia completes testing of modified VVER-440 fuel
2018/12/7 10:30:00 - 核一廠1號機於107年12月6日進入除役期間,原能會將嚴格監督台電公司落實除役計畫及安全要求
2018/12/7 10:29:55 - Russia and Rwanda to cooperate in nuclear power
2018/12/7 10:20:00 - 核一廠1號機執照屆滿依法停機 待取得除役許可正式啟動除役






30013 新竹市光復路二段101號 創新育成中心三樓309室 電話:(03)571-1808 傳真:(03)572-5461 Email: nicenter@nicenter.org.tw