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NKS Programme Area:NKS-R
Research Area:Severe accidents and Reactor Physics
Report Number:NKS-84
Report Title:The Possibility and the Effects of a Steam Explosion in the BWR Lower Head on Recriticality of a BWR Core
Activity Acronym:SOS-2.3
Authors:B.R. Sehgal & T.N. Dinh
Abstract:The report describes an analysis considering a BWR postulated severe accident scenario during which the late vessel automatic depressurization brings the water below the level of the bottom core plate. The subsequent lack of ECCS leads to core heat up during which the control rods melt and the melt deposits on the core plate. At that point of time in the scenario, the core fuel bundles are still intact and the Zircaloy clad oxidation is about to start. The objective of the study is to provide the conditions of reflood into the hot core due to the level swell or a slug delivered from the lower head as the control rod melt drops into the water. These conditions are employed in the neutronic analysis with the RECRIT code to determine if the core recriticality may be achieved.
Publication date:01 Dec 2002
ISBN:ISBN: 87-7893-142-8
Number of downloads:1980
Download:pdf NKS-84.pdf
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