RESULTS AND INSIGHTS FROM LEVEL-1 PROBABILISTIC SAFETY ASSESSMENTS FOR NUCLEAR-POWER-PLANTS IN FRANCE, GERMANY, JAPAN, SWEDEN, SWITZERLAND AND THE UNITED-STATES

Citation
Wf. Werner et al., RESULTS AND INSIGHTS FROM LEVEL-1 PROBABILISTIC SAFETY ASSESSMENTS FOR NUCLEAR-POWER-PLANTS IN FRANCE, GERMANY, JAPAN, SWEDEN, SWITZERLAND AND THE UNITED-STATES, Reliability engineering & systems safety, 48(3), 1995, pp. 165-179
Citations number
25
Categorie Soggetti
Operatione Research & Management Science","Engineering, Industrial
ISSN journal
09518320
Volume
48
Issue
3
Year of publication
1995
Pages
165 - 179
Database
ISI
SICI code
0951-8320(1995)48:3<165:RAIFLP>2.0.ZU;2-F
Abstract
The level-1 results of 14 PSAs from 6 countries were evaluated, leadin g to the following conclusions: benefits-in terms of reduced CDF-from the increased redundancy, improved spatial separation and enhanced aut omation of the systems, that exist in newer plants, are only seen for PWRs, In the older BWRs, the absence of such features is compensated b y a high degree of intermeshing and greater flexibility for using alte rnate RPV-injection and heat removal. Two old plants that have been eq uipped with completely independent, bunkered emergency systems, compar e favourably with modern plants; preventive AM is highly effective for transients in PWRs, and for accident situations involving the loss of heat removal in BWRs; for the newer plants, PWR as well as BWR, the c ontribution to the total CDF from common cause failures is consistentl y higher, and the contribution from operator errors consistently lower , than for the older plants; the CDF for BWRs is, in general, lower th an for the PWRs. The largest impacts on the results and on their uncer tainties are consistently observed for human errors, common cause fail ures, and initiator frequencies for LOCAs, in particular SLOCAs, in PW Rs. The largest impacts on the results and on their uncertainties are consistently observed for human errors, common cause failures, and ini tiator frequencies for LOCAs, in particular SLOCAs, in PWRs.