ENS 52492

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v t e ENS Event
16:55 Jan 16, 2017
Title	Failure of Reactor Building Isolation Dampers to Isolate
Event Description	On January 16, 2017, with the reactor at 100 percent and the mode switch in RUN, Pilgrim Station was performing preventative maintenance of secondary containment isolation dampers when dampers AO-N-82 and AO-N-83, refueling floor supply isolation dampers, failed to fully close when the control switches were taken to close. This 8-hour non-emergency notification is being made in accordance with 10 CFR 50.72(b)(3)(v), Any event or condition that at the time discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: (C) Control the release of radioactive material; or (D) Mitigate the consequences of an accident. The reactor building isolation dampers were cleaned and lubricated and post-work tested and timed in accordance with station procedures to verify that they had satisfactory closing times. Pilgrim Nuclear Power Station has returned the dampers to Operable status. The licensee will notify the Commonwealth of Massachusetts. The licensee has notified the NRC Resident Inspector.

ENS 52492 +/-
Where
Pilgrim Massachusetts (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-0.27 h-0.0113 days <br />-0.00161 weeks <br />-3.69846e-4 months <br />)
Opened:	Michael Mcdonnell 16:39 Jan 16, 2017
NRC Officer:	Steven Vitto
Last Updated:	Jan 16, 2017
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v • d • e

v t e Emergency Notification System
Pilgrim with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2019-01-08T05:00:00 [Table view]
[ENS list for Pilgrim]

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