ENS 45879
ENS Event | |
|---|---|
18:00 Apr 28, 2010 | |
| Title | Rcic Declared Inoperable Due to Oil Leak on Governor System |
| Event Description | On 04/28/10, at 1400 EDT, with the reactor at 100% power, the Reactor Core Isolation Cooling (RCIC) system was declared inoperable by the Shift Manager (SM) due to an oil leak on the RCIC governor control oil system that could have impacted the system performance during the accredited 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> mission time. The fitting where the oil leakage was observed was tightened and the machine was placed in service with no leakage identified. Currently the system is operable and in its normal standby lineup. The system was available for use during this time. At no time was there an impact to the health and safety of the public.
The licensee has notified the NRC Resident Inspector.
On April 28, 2010, at 1940 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.3817e-4 months <br />, Pilgrim Nuclear Power Station (PNPS) made an 8-hour non-emergency 50.72 notification, Event Notification EN 45879. The notification was made in accordance with 50.72 (b)(3)(v)(D), Accident Mitigation. Earlier on April 28, 2010, at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, a minor oil leak had been identified on the Reactor Core Isolation Cooling (RCIC) system at a lubricating oil vent fitting. The leak was immediately repaired by properly tightening the fitting, then running RCIC to verify no active leak existed. However in the interim, the Shift Manager conservatively declared RCIC inoperable when the high standard for operability could not be assured by initial system engineering judgment for the impact of the oil leak on RCIC system performance in consideration of mission time. Subsequent engineering evaluation concluded that the observed leak, conservatively assumed to be one drop per 3 minutes, would not have impacted RCIC operability for the duration of its required 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> mission time. All relevant technical information is documented in the PNPS corrective action system. Therefore PNPS is retracting the event notification EN 45879. The USNRC Resident Inspector Office has been notified of this retraction. Notified R1DO (Dwyer). |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+1.67 h0.0696 days <br />0.00994 weeks <br />0.00229 months <br />) | |
| Opened: | John Ohrenberger 19:40 Apr 28, 2010 |
| NRC Officer: | John Knoke |
| Last Updated: | May 28, 2010 |
| 45879 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |