Abstract
Gamma ray dose is calculated for loss of coolant accident in spent fuel pond (SFP) storing irradiated fuels used in light water reactors. Influence of modelling of fuel assemblies, source distributions, and loading fraction of fuel assemblies in the fuel rack on the dose are investigated.
Highlights
In systems of light water reactors, discharged spent fuel assemblies (FAs) are stored in racks of a spent fuel ponds (SFP)
In unit 4 of 1F, its decay heat removal function was recovered by feeding water from a concrete pumping vehicle prepared outside reactor building (R/B) and the SFP was prevented from LOCA, at last [1]
We modelled FAs and a SFP and analysed radiation dose at the top height of SFP since the radiation dose at the level would be the source of skyshine radiation
Summary
In systems of light water reactors, discharged spent fuel assemblies (FAs) are stored in racks of a spent fuel ponds (SFP). In unit 4 of 1F, its decay heat removal function was recovered by feeding water from a concrete pumping vehicle prepared outside R/B and the SFP was prevented from LOCA, at last [1]. In addition to evaporation following to malfunction of RHR, leakage of coolant by siphon phenomenon initiated by destruction of outlet pipes of SFP cooling and cleanup systems is lined up on the anticipated sequence to SFP LOCA. In the both cases, utilities have to assess what is happened when active region of FAs is exposed to air. Important parameters to be assessed for the radiation dose were outlined
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