Power Reactor Event Number: 41753

Facility: HOPE CREEK Region: 1 State: NJ Unit: [1] [ ] [ ] RX Type: [1] GE-4

NRC Notified By: ANDREW SCHIRMER HQ OPS Officer: MIKE RIPLEY

Notification Date: 06/07/2005

Notification Time: 15:30 [ET] Event Date: 06/07/2005 Event Time: 14:37 [EDT]

 Last Update Date: 06/08/2005

Emergency Class: UNUSUAL EVENT 10 CFR Section: 50.72(a) (1) (i) - EMERGENCY DECLARED Person (Organization): TODD JACKSON (R1) IAN JUNG (NRR) TIM MCGINTY (IRD) TODD JACKSON (R1) AKERS (DHS) AUSTIN (FEMA) RAWLS (NRC) WYATT (DOE) DALZIEL (HHS) BRZOSTEK (USDA) Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 1 M/R Y 100 Power Operation 0 Hot Shutdown

Event Text UNUSUAL EVENT DECLARED DUE TO UNIDENTIFIED DRYWELL LEAKAGE GREATER THAN 10 GPM

"Hope Creek manually scrammed the reactor from 100% power at 1413 and declared an Unusual Event due to unidentified drywell leakage exceeding 10 gpm (EAL 2.1.1.b) at 1437.

The drywell unidentified leak rate peaked at approximately 15 gpm and is currently 12 gpm and slowly lowering.

All safety systems were operable prior to the transient and responded as expected.

Drywell pressure peaked at approximately 0.5 psig and is steady using normal drywell cooling (the normal pressure band is 0.1 to 0.7 psig).

Drywell and suppression pools sprays were not required to mitigate the drywell pressure transient.

Reactor vessel level lowered to approximately -30 inches following the scram and was returned to the normal level band using the feedwater and condensate systems.

The expected vessel level 3 (setpoint +12.5 inches) ESF actuations occurred.

The plant is proceeding to cold shutdown to investigate the drywell leak."

The licensee notified the NRC Resident Inspector.

* * * UPDATE BY NRC (HOLIAN) TO HUFFMAN AT 0330 EDT ON 6/08/05 * * *

As of 0330, Region I IRC in consultation with NRC/IRD (McGinty) secured from Monitoring Mode based on the plant being stable at about 55 psig (about 300 degrees F) and preparing to initiate shutdown cooling.

The leak rate remains at about 8 gpm, and an initial drywell entry determined the source of the leakage to be from the A-loop of shutdown cooling testable check valve (50A ).

The valve was found with the position indication failed/separated and an approximate 20 foot plume of steam/liquid coming out.

Plans are to continue to cool down the plant, go onto the B-loop of shutdown cooling , and isolate valve 50A.

The licensee has conservatively remained in the UE and plans to exit when leak rate is assured to remain below 10 gpm (EAL entry condition) or cold shutdown is achieved and the EAL is no longer applicable.

The licensee's outage center remains manned, and an NRC inspector remains on site around the clock.

DHS (Hoisington), FEMA (Sweetser), DOE (Turner) EPA (Crews), USDA (Pimmons), HHS (Williams) were notified.

* * * UPDATE BY NRC (MANGAN - RG 1) TO HUFFMAN AT 0500 EDT ON 6/08/05 * * *

The licensee has placed RHR loop B into service and reached Mode 4 (cold shutdown) at 0455.

Preparations are in progress to isolate the leak by closing manual valve 183.

* * * UPDATE FROM LICENSEE (WILSON) TO HUFFMAN AT 0530 EDT ON 6/08/05 * * *

The licensee terminated the Unusual Event at 0515 EDT based on reaching cold shutdown with the leak rate less than 10 gpm.

The licensee notified the NRC Resident Inspector. DHS (Hoisington) and FEMA (Sweetser) notified.