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