Loss of Reactor Coolant Inventory and Associated Potential for Loss of Emergency Mitigation Functions While in a Shutdown Condition; Issue

概要

The Nuclear Regulatory Commission (NRC) has issued Generic Letter (GL) 98-02 to all holders of operating licenses for pressurized- water reactors, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel, to request that addressees (1) assess the susceptibility of their residual heat removal (RHR) and emergency core cooling (ECC) systems to common-cause failure as a result of reactor coolant system (RCS) draindown while in a shutdown condition, and (2) submit certain information, pursuant to Sec. 50.54(f) of Title 10 of the Code of Federal Regulations (10 CFR 50.54(f)), concerning their findings regarding potential pathways for inadvertent RCS drain-down and the suitability of surveillance, maintenance, modification and operating practices and procedures regarding configuration control during reactor shutdown cooling. The generic letter is available in the NRC Public Document Room under accession number 9805050197.