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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

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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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Thursday, March 29, 2012