Analysis on criticality properties and control strategies after reflooding of a damaged reactor core

Jeong, Hae Sun; Park, Chang Je; Ha, Kwang Soon

doi:10.1016/j.anucene.2014.01.024

Cited by 5 publications

(3 citation statements)

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“…As seen from the results presented in [7], the use of pure (non-borated) water for cooling may cause criticality at all stages of a beyond design basis accident with core melt. Another analysis presented in [8] and continued in [9] concerns BWR reactor fuel.…”

Section: Criticality Under Severe Accidentsmentioning

confidence: 99%

“…Therefore, it is assumed that re-criticality of the reactor corium would be possible if there is no neutron absorber. In [9] a slightly different computer model is used. Molten rods, elements of fuel assemblies and internals were considered (Figure 4).…”

Section: Criticality Under Severe Accidentsmentioning

confidence: 99%

“…Figure 4 -conceptual model for criticality calculation from [9] However, the critical mass was achieved with UO 2 of about 80 kg. The minimum amount exceeding the critical value of K eff = 0.95 was approximately 60 kg.…”

Section: Analysis Of Fuel Criticality During Severe Accidentsmentioning

confidence: 99%

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Analysis of Fuel Criticality during Severe Accidents

Bilodid

Duspiva

2015

Nucl. and Rad. Safe.

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Interest in the analysis of beyond design basis accidents, involving a combination of several failures with fuel damage, has increased throughout the world after the Fukushima accident. Stress tests were performed at NPPs, and development of severe accident management guidelines was started. These activities necessitated calculations to analyze the probability of beyond design basis accidents and assess their initiating events and consequences. One of the aspects in analysis of beyond design basis accidents is to determine the potential for re-criticality during such accidents. The paper provides results of some criticality safety calculations for VVER reactors performed, in particular, by ÚJV Řež and SSTC NRS experts. It is shown how criticality can occur in different severe accident phases.

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Section: Criticality Under Severe Accidentsmentioning

confidence: 99%

Section: Criticality Under Severe Accidentsmentioning

confidence: 99%