Susquehanna shut down

Event Number: 46654
Event Date: 03/03/2011
Facility: SUSQUEHANNA

TECHNCIAL SPECIFICATION REQUIRED SHUTDOWN DUE TO INOPERABLE HPCI

At 2259 EST, Susquehanna Unit 1 commenced a TS Required shutdown for High Pressure Coolant Injection (HPCI) T.S. 3.5.1. Due to a suspected steam leak, the HPCI Inboard Steam Supply Valve HV155F002 was closed to attempt to identify and isolate an unknown drywell leakage condition. After closing the HV155F002, a detectable change in drywell leak rate occurred, therefore, HV155F002 was left closed. Closing HV155F002 makes HPCI INOP and UNAVAILABLE.

TS 3.5.1 was entered for this condition on 2/25/2011 at 2136 EST. LCO completion time for T.S. 3.5.1 entry is 3/11/2011 at 2136 EST.

The licensee has notified the NRC Resident Inspector and State authorities. The licensee also anticipates issuing a press release.