ENS 46786

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v t e ENS Event
05:20 Apr 26, 2011
Title	Safety Related Piping Had Unacceptable Air Void
Event Description	Engineering reported that an ultrasonic [test] had identified an unacceptable air void in the horizontal run of suction piping from the Refueling Water Storage Tank (RWST) to the Safety Injection pumps, Residual Heat Removal pumps, and Containment Spray pumps. Technical Specification 3.0.3 was entered at 0020 CDT [on] 04/26/2011, and actions were started to remove the [air] void by venting of the suction pipe. Unit 2 was in progress of low power physics testing following refueling outage 2RF12. Inspection for [air] voids is in response to NRC generic letter on voiding in ECCS piping. The void was removed from the system by venting. Engineering confirmed with ultrasonic [test] that the void was removed, and Technical Specification 3.0.3 was exited at 0143 CDT [on] 04/26/2011. The licensee has notified the NRC Resident Inspector. * * RETRACTION FROM MIKE NIEMEYER TO DONALD NORWOOD AT 1628 EDT ON 6/23/2011 * * * Further analysis demonstrated that the declaration of inoperability was a conservative action, and RHR and SI would have fulfilled their respective safety functions and been operable. This analysis is based on a detailed study of the void transport and piping design. The analysis confirmed that one (1) train of containment spray was inoperable, however the containment spray safety function would have been fulfilled with the remaining operable [containment spray] train. Based on the above, it is concluded that the health and safety of the public were unaffected by this condition and this event has been evaluated to not meet the definition of a safety system functional failure per 10CFR50.72(b)(3)(v)(D). The NRC Resident Inspector has been notified of this retraction. Notified R4DO (Deese).

ENS 46786 +/- *RETRACTED*
Where
Comanche Peak Texas (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-1.37 h-0.0571 days <br />-0.00815 weeks <br />-0.00188 months <br />)
Opened:	Raul Martinez 03:58 Apr 26, 2011
NRC Officer:	John Knoke
Last Updated:	Jun 23, 2011
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v • d • e

v t e Emergency Notification System
Comanche Peak with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2024-03-05T13:20:00 [Table view]
[ENS list for Comanche Peak]

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