The first steam generator for China's demonstration high-temperature gas-cooled reactor plant (HTR-PM) has completed air pressure tests, confirming its integrity, China National Nuclear Corporation (CNNC) has announced.
The test was completed on 29 September, one month ahead of schedule, CNNC said. Completion of the test "indicates that China has fully mastered the design and manufacture" of steam generators for high-temperature gas-cooled reactors, according to the company.
Work began on the demonstration HTR-PM unit - which features two small reactors and a turbine - at China Huaneng's Shidaowan site in December 2012. China Huaneng is the lead organisation in the consortium to build the demonstration units together with CNNC subsidiary China Nuclear Engineering Corporation (CNEC) and Tsinghua University's Institute of Nuclear and New Energy Technology, which is the research and development leader. Chinergy, a joint venture of Tsinghua and CNEC, is the main contractor for the nuclear island.
The demonstration plant's twin HTR-PM reactors will drive a single 210 MWe turbine. Helium gas will be used as the primary circuit coolant. The steam generator transfers heat from helium coolant to a water/steam loop. The design temperature of the HTR-PM reaches 750°C. "The overall structure is very complex, and the requirements for raw materials and manufacturing processes are extremely high," said CNNC.
The pressure vessel of the first reactor was installed within the unit's containment building in March 2016. The vessel - about 25 metres in height and weighing about 700 tonnes - was manufactured by Shanghai Electric Nuclear Power Equipment. The second reactor pressure vessel was installed later that year.
The first of the graphite moderator spheres was loaded within the core of the first reactor in April last year. In July, the thermal hydraulic parameters of the steam generator were validated. The demonstration HTR-PM is expected to be connected to the grid and start electricity generation this year.
A further 18 such HTR-PM units are proposed at Shidaowan.
Beyond HTR-PM, China proposes a scaled-up version called HTR-PM600, which sees one large turbine rated at 650 MWe driven by some six HTR-PM reactor units. Feasibility studies on HTR-PM600 deployment are under way for Sanmen, Zhejiang province; Ruijin, Jiangxi province; Xiapu and Wan'an, in Fujian province; and Bai'an, Guangdong province.
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決壊ダム高さ、コスト削減で6.4メートルもカット
団藤保晴
2018年10月17日 20:04
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はてな1
７月にラオスで起きたダム決壊の原因は、建設にあたった韓国企業がコスト削減のために設計よりもダム堤防を6.4メートルも低く建設したからと見られ始めました。これによる工期短縮でボーナスまで得ていました。ハンギョレ新聞の英語版《SK E&C’s attempts to cut costs led to design changes that resulted in collapse of dam in Laos》が15日に報じました。８月に書いた第588回「ラオス決壊は土のダムで越流させた設計と管理ミス」での指摘に合致します。
ハンギョレ新聞は与党国会議員が入手した2012年11月付け文書「Laos Dam Project Implementation Plan」をもとに報じています。韓国ＳＫ建設は詳細設計段階で補助ダムの形と材料を変更して1900万ドルをカットしました。湛水テスト開始に向けて、建設が遅れていたのをカバーしてボーナスまで受け取りました。最も目立つのは、決壊したダムが高さ25メートルで基本設計されていたのに18.6メートルで造られた点です。他の補助ダムも高さ10メートルが3.5メートルに落とされました。利益を増やすための設計変更について、ＳＫ建設側は「補助ダムはメインダム工事に比べて重要でないとみなされていた」と国会議員の聞き取りに答えています。
