Event Number: 40996

Facility: HOPE CREEK Region: 1 State: NJ Unit: [1] [ ] [ ] RX Type: [1] GE-4 NRC Notified By: ART BREADY HQ OPS Officer: ARLON COSTA Notification Date: 08/30/2004 Notification Time: 02:54 [ET] Event Date: 08/29/2004 Event Time: 19:28 [EDT] Last Update Date: 08/30/2004 Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL Person (Organization): EUGENE COBEY (R1) Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 1 N Y 98 Power Operation 98 Power Operation

 Event Text ALARM INDICATION OF INOPERABLE REACTOR WATER CLEANUP SUPPLY ISOLATION VALVE

"On 08/29/04 at 1928 hours [EDT], an alarm was received in the control room indicating the reactor water cleanup (RWCU) high differential flow isolation channel for the outboard RWCU supply isolation valve was inoperable.

 At the time, the channel functional test for the inboard RWCU high differential flow isolation channel was being performed.

During the channel functional test, power to the inboard isolation valve is removed to permit continued RWCU system operation while the isolation function is tested.

With the outboard isolation actuation instrumentation channel inoperable and the inboard isolation valve deenergized, in the event of a break in the RWCU system, the required isolation function may not be completed.

"This event is being reported in accordance with 10CFR50.72(b)(3)(v)(C) as a condition that could have prevented the fulfillment of a safety function.

"In accordance with Technical Specification requirements, the RWCU system was removed from service and the inboard and outboard supply Isolation valves were closed."

 There is no immediate impact on water chemistry and the licensee is investigating the cause of the original failure as well as possible long term degradation of the reactor water chemistry.

 The licensee notified the NRC Resident Inspector and will notify the local township authorities of this incident.