Engineering identified fuse and breaker coordination issues with
Reactor Core Isolation Cooling (
RCIC) valves operated at the
Remote Shutdown Panel (RSDP). The coordination issues are such that, given a fire in the main control room, it is possible that
RCIC valve power supply breakers could trip prior to tripping control power fuses. Operation of
RCIC from the RSDP could be impaired in this scenario without compensatory actions to reset breakers.
RCIC is the single credited source of makeup to the
reactor pressure vessel during this scenario. The current licensing basis (Fire Protection Report) does not identify the compensatory actions required to reset breakers prior to
RCIC operation at the RSDP. This condition is applicable to Unit 1 and Unit 2.
This report is being made pursuant to 10CFR50.72(b)(3)(ii)(B), 'Event or Condition that results in an unanalyzed condition that significantly degrades plant safety'.
Actions are being taken to amend the appropriate operating procedures to take the required steps to ensure proper operation of RCIC in the postulated scenario.
The licensee has notified the NRC Resident Inspector.
