On 5/28/07 with Hope Creek in Operating Condition 1 at 100% Reactor power, an electrical
transient and loss of 'A' and 'B' reactor feed pumps resulted in lowering reactor water level. Operators inserted a
manual reactor scram at 0835 in response to the lowering reactor water level. Reactor water level lowered to (-) 38 inches subsequent to the manual
scram, resulting in initiation of
High Pressure Coolant Injection (HPCl) and injection to the reactor vessel. The
Reactor Core Isolation Cooling (
RCIC) system also initiated but tripped. Investigation of the cause of the electrical
transient, loss of the 'A' and 'B'
RFP's, and trip of the
RCIC system are currently in progress.
Initial review of the event indicates that all other systems operated as expected. Current plant conditions as of 1100 are: Hope Creek is in mode 3 at 715 psig with heat removal to the main condenser via the Main Turbine Bypass valves. All control nods fully inserted on the scram.
This report also documents a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> report under 10CFR50.72(b)(2)(iv)(A) for valid ECCS initiation and injection to the reactor vessel (RAL 11.3.1).
The reactor is stable with the water level currently at 17 inches and feedwater being supplied by the 'C' feed pump. No Safeties lifted during the transient. All systems functioned as required except for the trip of the RCIC. The licensee was not in any major technical specification LCO at the time of the trip.
The licensee notified the NRC Resident Inspector. The licensee will also notify the States of NJ and Delaware, and
Lower Alloways Creek Township.
