期刊
NUCLEAR ENGINEERING AND DESIGN
卷 263, 期 -, 页码 284-295出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2013.06.011
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资金
- Swedish Nuclear Radiation Protection Authority (SSM)
- Swedish Power Companies
- European Commission (SARNET-2)
- Nordic Nuclear Safety Program (NKS)
- Swiss Federal Nuclear Safety Inspectorate (ENSI) under the APRI-MSWI program
- Mitsubishi Heavy Industry in the framework of the research projects at the Royal Institute of Technology (KTH), Stockholm, Sweden
Flooding of lower drywell has been adopted as a cornerstone of severe accident management strategy in Nordic type Boiling Water Reactors (BWR). It is assumed that the melt ejected into a deep pool of water will fragment, quench and form a porous debris bed coolable by natural circulation. If debris bed is not coolable, then dryout and possibly re-melting of the debris can occur. Melt attack on the containment basemat can threaten containment integrity. Agglomeration of melt debris and formation of solid cake regions provide a negative impact on coolability of the porous debris bed. In this work we present results of experimental investigation on the fraction of agglomerated debris obtained in the process of hot binary oxidic melt pouring into a pool of water. The Debris Bed Formation and Agglomeration (DEFOR-A) experiments provide data about the effects of the pool depth and water subcooling, melt jet diameter, and initial melt superheat on the fraction of agglomerated debris. The data presents first systematic study of the debris agglomeration phenomena and facilitates understanding of underlying physics which is necessary for development and validation of computational codes to enable prediction of the debris bed coolability in different scenarios of melt release. (c) 2013 Elsevier B.V. All rights reserved.
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