ENS 42822
ENS Event | |
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21:09 Aug 31, 2006 | |
Title | Technical Specification Required Shudown Due to Rcs Leakage |
Event Description | 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.
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. |
Where | |
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Diablo Canyon California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
Time - Person (Reporting Time:+-2.45 h-0.102 days <br />-0.0146 weeks <br />-0.00336 months <br />) | |
Opened: | Michael Kennedy 18:42 Aug 31, 2006 |
NRC Officer: | Jason Kozal |
Last Updated: | Aug 31, 2006 |
42822 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (90 %) |