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EBR-II passive safety demonstration tests benchmark analyses; Phase 2

EBR-IIの受動的安全性模擬試験におけるベンチマーク解析; フェーズ2

Briggs, L.*; Monti, S.*; Hu, W.*; Sui, D.*; Su, G. H.*; Maas, L.*; Vezzoni, B.*; Partha Sarathy, U.*; Del Nevo, A.*; Petruzzi, A.*; Zanino, R.*; 大平 博昭; 望月 弘保*; 守田 浩二*; Choi, C. W.*; Shin, A.*; Stempniewicz, M.*; Rtishchev, N.*; Zhang, Y.*; Truong, B.*

Briggs, L.*; Monti, S.*; Hu, W.*; Sui, D.*; Su, G. H.*; Maas, L.*; Vezzoni, B.*; Partha Sarathy, U.*; Del Nevo, A.*; Petruzzi, A.*; Zanino, R.*; Ohira, Hiroaki; Mochizuki, Hiroyasu*; Motita, Koji*; Choi, C. W.*; Shin, A.*; Stempniewicz, M.*; Rtishchev, N.*; Zhang, Y.*; Truong, B.*

IAEA主催の「EBR-II炉停止のための熱除去試験に係るベンチマーク解析」研究共同プロジェクトは4年計画のうち3年目となっている。本プロジェクトには11ヶ国19機関がEBR-IIで行われた炉停止のための熱除去試験の内最も厳しい過渡試験の内の2ケースについて解析を実施してきた。ベンチマーク仕様に基づき炉心及び1次主冷却系の解析モデルを構築し解析を実施した。本プロジェクトのPhese 1ではブラインド解析が実施され測定データと比較・評価された。Phase 2では、Phese 1で試験データと合わなかった箇所を検討し解析モデルの改良を実施した。本論文では、最新の解析結果及び残された作業の実施方針を記載した。

The International Atomic Energy Agency Coordinated Research Project, "Benchmark Analyses of an EBR-II Shutdown Heat Removal Test" is in the third year of its four-year term. Nineteen participants representing eleven countries have simulated two of the most severe transients performed during the Shutdown Heat Removal Tests program conducted at Argonne's Experimental Breeder Reactor II. Benchmark specifications were created for these two transients, enabling project participants to develop computer models of the core and primary heat transport system, and simulate both transients. In phase 1 of the project, blind simulations were performed and then evaluated against recorded data. During phase 2, participants have refined their models to address areas where the phase 1 simulations did not predict as well as desired the experimental data. This paper describes the progress that has been made to date in phase 2 in improving on the earlier simulations and presents the direction of planned work for the remainder of the project.

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