Coupled MELCOR/COCOMO analysis on quench of ex-vessel debris beds

被引：10
作者：
Chen, Yangli [1 ]
Zhang, Huimin [1 ]
Ma, Weimin [1 ]
机构：
[1] Royal Inst Technol KTH, Roslagstullsbacken 21, S-10691 Stockholm, Sweden
来源：
ANNALS OF NUCLEAR ENERGY | 2022年 / 165卷
关键词：
Severe accident; Debris bed coolability; Coupled analysis; MELCOR; COCOMO; 2-PHASE FLOW; COOLABILITY; DRYOUT; WATER; VALIDATION; PRESSURE; MELCOR; CODE;
D O I：
10.1016/j.anucene.2021.108643
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The cornerstone of severe accident strategy of Nordic BWRs is to flood the reactor cavity for the long-term coolability of an ex-vessel debris bed. As a prerequisite of the long-term coolability, the hot debris bed formed from fuel coolant interactions (FCI) should be quenched. In the present study, coupling of the MELCOR and COCOMO codes is realized with the aim to analyze the quench process of an ex-vessel debris bed under prototypical condition of a Nordic BWR. In this coupled simulation, MELCOR performs an integral analysis of accident progression, and COCOMO performs the thermal-hydraulic analysis of the debris bed in the flooded cavity. The effective diameter of the particles is investigated. The discussion on the bed's shape shows a significant effect on the propagation of the quench front, due to different flow patterns. Compared with MELCOR standalone simulation, the coupled simulation predicts earlier cavity pool saturation and containment venting. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
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页数：12
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