On August 31, 2006, licensed plant operators identified that
Technical Specification 3.4.13 was not met due to a one to two gallon per minute unidentified
reactor coolant system (
RCS) leak. Plant Operators initiated a ramp of reactor power to take Unit 2 to mode 3, Hot Standby, at 1409 PDT. A containment entry has been initiated to identify the source of the
RCS leak. The estimated restart date is preliminary, pending investigation of the leakage location. The Unit is currently ramping off line at 4-5 MW/min. Current reactor power level is 90% and 937
MW electric.
The licensee stated that the suspected source of the leak is the seal table room where radiation levels have risen consistent with the containment leakage. Current unidentified leak rate is 1.3 gpm. The TS limit is 1 gpm. Current coolant activity is 1.88 microCi/ml.
A press release is planned to be issued on 9/1/2006.
The licensee notified the NRC Resident Inspector.
- * * UPDATE PROVIDED BY D. PATTY TO O'HARA ON 08/31/06 AT 2254 EST * * *
This is a follow up to the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> notification that was initiated due to initiating a Technical Specification (TS) required shutdown when Technical Specification 3.4.13 was not met.
Plant Operators entered containment and identified RCS leakage from one of the thimble tubes in the seal table 10 path. At 1622 on 8/31/06 the leakage was classified as identified leakage. The TS required shut down was stopped at 1623 as the leak rate is less than the TS leak rate limit for identified leakage. Operators have isolated the 10 path by closing the valve and the RCS leakage has stopped.
Notified R4DO (Cain),
NRR EO (McGinty) via e-mail,
IRD MOC (Leach) via e-mail.
