ENS 44593: Difference between revisions

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| event date = 10/22/2008 12:17 EDT
| event date = 10/22/2008 12:17 EDT
| last update date = 12/12/2008
| last update date = 12/12/2008
| title = Rcic Declared Inoperable Due To Aging Concern Of Several Flow Controller Components
| title = Rcic Declared Inoperable Due to Aging Concern of Several Flow Controller Components
| event text = On October 22, 2008, at 1217 hours, with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) conservatively declared the Reactor Core Isolation Cooling System (RCIC)  inoperable in response to a concern regarding the reliability of aged capacitors that are installed in the RCIC flow controller.
| event text = On October 22, 2008, at 1217 hours, with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) conservatively declared the Reactor Core Isolation Cooling System (RCIC)  inoperable in response to a concern regarding the reliability of aged capacitors that are installed in the RCIC flow controller.
As background, the RCIC flow controller was calibrated and successfully tested on October 7th, 2008 as part of normal surveillance activities, however several of the capacitors installed in the controller were noted to be between 21 to 30 years of age.  Industry recommended replacement interval for the capacitors is typically between 7 to 10 years of age.  PNPS engineering review in conjunction with Entergy fleet consultation concluded today (10/22) that there was no definitive technical bases to provide a reasonable expectation that the RCIC flow controller function can be assured throughout it's mission time due to the capacitor aging concern.  Therefore, RCIC was declared inoperable and a 14 day limiting condition for operability action statement was entered in accordance with TS 3.5.D.1.  A replacement controller is being prepared for installation, with post maintenance testing projected to be completed by 2100 hours this evening.  Ultimately the suspect controller will be the subject of further evaluation and this notification will be updated as appropriate.
As background, the RCIC flow controller was calibrated and successfully tested on October 7th, 2008 as part of normal surveillance activities, however several of the capacitors installed in the controller were noted to be between 21 to 30 years of age.  Industry recommended replacement interval for the capacitors is typically between 7 to 10 years of age.  PNPS engineering review in conjunction with Entergy fleet consultation concluded today (10/22) that there was no definitive technical bases to provide a reasonable expectation that the RCIC flow controller function can be assured throughout it's mission time due to the capacitor aging concern.  Therefore, RCIC was declared inoperable and a 14 day limiting condition for operability action statement was entered in accordance with TS 3.5.D.1.  A replacement controller is being prepared for installation, with post maintenance testing projected to be completed by 2100 hours this evening.  Ultimately the suspect controller will be the subject of further evaluation and this notification will be updated as appropriate.

Latest revision as of 21:13, 1 March 2018

ENS 44593 +/- *RETRACTED*
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:+1.42 h0.0592 days <br />0.00845 weeks <br />0.00195 months <br />)
Opened: Mert Probasco
17:42 Oct 22, 2008
NRC Officer: Jeff Rotton
Last Updated: Dec 12, 2008
44593 - NRC Website
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