Observations based on analysis insights

The completion of PSA analysis for a large number of plants has allowed a more comprehensive and systematic assessment of the safety of the plants. Systems and situations to vdiich not much attention was paid before, are now considered relevant to safety (i.e. analysis of accidents in modes other than full power, anticipated transients without scram (ATWS), station blackout, spent fuel systems, specific configuration situations, maintenance rule, external hazards). Issues with an analysis source include GL 4, SS 8, CS 3, AA 4, AA 5, AA 6, AA 7, MA 11, EP 3, TR 3, FS 2. 

Although plant specific PSAs will continue to identify vulnerabilities for particular plants, a large number of additional analysis issues with widespread applicability is not expected. Attention will need to continue, however, with respect to the adequacy of computer modeling of accident phenomena and the applicability of reliability data used in the PSA analyses. 

There is also an opportunity, given current analytical capabilities and monitoring techniques, of significantly improving component reliability by the use of plant specific experience data to adjust maintenance and replacement programmes for active plant equipment. This is covered in GL 3, SS 12, SS 16, SS 17, ES 2, ES 6, ES 8, IC 4. 

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