A discretionary UE has been declared for PB (Peach Bottom) U/2 (Unit 2) and U/3 (Unit 3) due to a dual unit
transient that has resulted in both unit's scramming with a Group 1 (
Main Steam Isolation Valve closure)
PCIS isolation.
An electrical transient caused all 4KV emergency buses to be powered by the diesel generators. One diesel generator (E2) subsequently tripped leaving 6 of 8 (3 per unit) buses energized.
Off-site power is available. Preparations for transfer back to off-site power is in progress. The U/3 (Unit 3) "D" SRV (Safety relief valve) opened and did not close until electrically deenergized. The SRV is closed at this this time.'
Both reactors scrammed at 0132 EDT.
NRC Resident Inspectors, State and Local were notified by the licensee.
- * * Update 09/15/03 at 1055 EDT by McClellan to MacKinnon * * *
Unusual Event for Peach Bottom Nuclear Power Station Units 2 & 3 was terminated at 1046 EDT. Unusual Event was terminated because plant conditions have been stabilized, offsite electrical power has been restored to the plant and both plants being in cold shutdown in Mode 4. An investigation is in progress. State and Local will be notified by the licensee. R1DO (M. Shanbaky), NRR EO (C. Holden), DIRO Manager (Doug Weaver), FEMA (Jim Dunker), DHS (Mark Babb) & R4DO (T. Gody) notified.
The NRC Resident Inspectors are onsite and have been informed of the termination of the unusual event by the licensee.
