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Report No.

Fission product chemistry database ECUME version 1.1

Development Group for LWR Advanced Technology

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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