Criteria for assessment of results from level 2 PSA
2008 (English)In: Proc. of PSAM 9 — International Conference on Probabilistic Safety Assessment & Management, 18–23 May 2008, Hong Kong, China, IAPSAM — International Association of Probabilistic Safety Assessment and Management, 2008Conference paper (Other academic)
Probabilistic criteria are used to judge the acceptability of PSA results. Highest levelcriteria set limits to acceptable societal risk, which requires performance of level 3 PSA. In manycountries — including e.g. Finland and Sweden — performance of level 3 PSA is not required, andprobabilistic decision criteria (limits or targets) are defined only at core damage frequency and largerelease frequency level. The definition of probabilistic criteria for level 2 PSA has been one of the keyissues discussed in the Nordic study on validation of safety goals. There is a need to discuss and definemore precisely the decision criteria related to unacceptable releases, as they seem to be understooddifferently in different organizations. For instance, the inclusion or exclusion of long-term effectsmakes a big difference as well as the inclusion or exclusion of the affected population in neighboringcountries. This paper presents the summary and conclusions from the Nordic study with respect toprobabilistic criteria for level 2 PSA. In addition, the interpretation of the release criteria (<100 TBq,Cesium-137) defined in the Finnish regulatory guide YVL 2.8 will be presented by means of off-siteconsequences. Such assessments of the environmental consequences can be used as references tovalidate safety goals related to CDF and large releases as surrogates of societal risk.
Place, publisher, year, edition, pages
PSA, risk criteria, level 2 PSA, large release, LERF
IdentifiersURN: urn:nbn:se:kth:diva-90780OAI: oai:DiVA.org:kth-90780DiVA: diva2:506535
PSAM 9 — International Conference on Probabilistic Safety Assessment & Management, IAPSAM — International Association of Probabilistic Safety Assessment and Management. Hong Kong, China. 18–23 May 2008
QC 201205082012-02-282012-02-282012-05-08Bibliographically approved