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Event Notification Report for August 12, 2008

U.S. Nuclear Regulatory Commission Operations Center Event Reports For 08/11/2008 - 08/12/2008 ** EVENT NUMBERS ** 44404 Power Reactor Event Number: 44404 Facility: HARRIS Region: 2 State: NC Unit: [1] [ ] [ ] RX Type: [1] W-3-LP NRC Notified By: SCOTT FAULKNER HQ OPS Officer: HOWIE CROUCH Notification Date: 08/11/2008 Notification Time: 04:21 [ET] Event Date: 08/11/2008 Event Time: 00:49 [EDT] Last Update Date: 08/11/2008 Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL Person (Organization): GEORGE HOPPER (R2) Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 1 M/R Y 21 Power Operation 0 Hot Standby Event Text MANUAL REACTOR TRIP DUE TO DEGRADING CONDENSER VACUUM "At 0049 EDT on 8/11/2008, the Harris Nuclear Plant was manually scrammed from 21% power due to indications of degrading condenser vacuum. At the time, a reactor shutdown was in progress with indications of a degraded condenser boot seal. The unit was stabilized in Mode 3 with no additional equipment failures or other complications." The reactor is currently at normal operating pressure and temperature. The highest vacuum observed was 8". All rods inserted into the core after the manual trip. Auxiliary feed water did not start as a result of the trip. Steam generator level is being maintained via normal feed water flow path. Decay heat is being removed via the steam dumps to atmosphere. There is no known primary to secondary leakage. No power-operated or manual reliefs lifted during the transient. The grid is stable and loads are being supplied via the station start-up transformer. The licensee has notified the NRC Resident Inspector.

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