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Abstract LU149Full Paper + Presentation
ASNR’s approach to introduce countermeasures effects and health consequences assessment of NPP severe accident in PSA
ASNR (previously IRSN) develops its own PWRs Level 2 probabilistic safety assessments (L2+ PSAs), enabling the evaluation of containment failure mode frequencies and for each release category determined, release activities and metrics in terms of individual doses. The information obtained with these L2+ PSAs is useful for the PSA regulatory review of ASNR and also for its crisis center. A study is currently being developed to consider the dose-reduction effects of protective actions (countermeasures) on the health consequences related to these doses and brings these L2+ PSA closer to L3 PSA. Although L3 PSAs are not required for the safety demonstration in France, such assessments allow ASNR to develop knowledge on accident consequences and efficiency of emergency plans.
The first step of ASNR’s L3 PSA methodology is the modeling of the zoning and timing of protective actions, which is based on emergency plans defined by the French crisis organization. A L3 PSA probabilistic tree is then built and coupled with that of the L2 PSA. Each sequence generated corresponds to a specific timeline of implementation of the protective actions and depends on the accident’s configuration. Furthermore, dose-reduction from sheltering, stable iodine intake and evacuation are quantified with protection factors, defined for three different ages, four organs and three exposure pathways, in order to assess their impact on the deterministic and stochastic health consequences of the accident. Deterministic effects are evaluated as the risk of early fatality due to acute radiation injury for the two organs representing the predominant risk (lung, red bone marrow), both with and without consideration of the countermeasures. Stochastic effects of radiation exposure are evaluated as the excess risk of developing cancer for four radiation sensitive organs (thyroid, lung, red bone marrow, breast), both when countermeasures are considered and when they are not.
The paper presents the approach and hypotheses proposed to quantify the countermeasures effects on the doses assessment and the associated health consequences.
← Check another abstractThe first step of ASNR’s L3 PSA methodology is the modeling of the zoning and timing of protective actions, which is based on emergency plans defined by the French crisis organization. A L3 PSA probabilistic tree is then built and coupled with that of the L2 PSA. Each sequence generated corresponds to a specific timeline of implementation of the protective actions and depends on the accident’s configuration. Furthermore, dose-reduction from sheltering, stable iodine intake and evacuation are quantified with protection factors, defined for three different ages, four organs and three exposure pathways, in order to assess their impact on the deterministic and stochastic health consequences of the accident. Deterministic effects are evaluated as the risk of early fatality due to acute radiation injury for the two organs representing the predominant risk (lung, red bone marrow), both with and without consideration of the countermeasures. Stochastic effects of radiation exposure are evaluated as the excess risk of developing cancer for four radiation sensitive organs (thyroid, lung, red bone marrow, breast), both when countermeasures are considered and when they are not.
The paper presents the approach and hypotheses proposed to quantify the countermeasures effects on the doses assessment and the associated health consequences.