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Fission product chemistry database ECUME version 1.1

核分裂生成物化学挙動データベースECUME version 1.1

性能高度化技術開発グループ

Development Group for LWR Advanced Technology

核分裂生成物(FP)化学挙動データベースECUME($$underline{E}$$ffective $$underline{C}$$hemistry database of fission products $$underline{U}$$nder $$underline{M}$$ultiphase r$$underline{E}$$action)は、軽水炉等の原子力施設の重大事故時のFP挙動を支配する化学挙動を評価するために必要な化学反応速度定数データセットCRK (dataset for $$underline{C}$$hemical $$underline{R}$$eaction $$underline{K}$$inetics)、要素モデルセットEM ($$underline{E}$$lemental $$underline{M}$$odel set)、そして熱力学データセットTD ($$underline{T}$$hermo$$underline{D}$$ynamic dataset)の3つのデータセットを格納している。ECUME ver. 1.1は、特に東京電力福島第一原子力発電所の廃炉やそれを受けた軽水炉の安全性向上の取り組みにおいて重要なセシウム, ヨウ素を主な対象として、これらの炉内分布や環境放出量をより正確に評価できるように整備したものである。

ECUME ($$underline{E}$$ffective $$underline{C}$$hemistry database of fission products $$underline{U}$$nder $$underline{M}$$ultiphase r$$underline{E}$$action) is the database for the analyses of FP chemistry which strongly affects all the FP behaviors in a severe accident (SA) of nuclear facility like LWR. ECUME consists of three kinds of datasets: CRK (dataset for $$underline{C}$$hemical $$underline{R}$$eaction $$underline{K}$$inetics), EM ($$underline{E}$$lemental $$underline{M}$$odel set) and TD ($$underline{T}$$hermo$$underline{D}$$ynamic dataset). The present version of ECUME is prepared especially for the more accurate evaluation of cesium and iodine distribution in a reactor and release amount into an environment which should be of crucial importance towards the decommissioning of Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings (1F) and the enhancement of LWR safety after the 1F SA.

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