ENS 47854

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v t e ENS Event
21:45 Apr 19, 2012
Title	Potential Fire Induced Spurious Operation of Steam Generator Porv Block Valves
Event Description	On March 22, 2012, McGuire Nuclear Station notified the NRC of a condition which could result in fire induced spurious operation of the block valves for the Unit 2 Steam Generator (SG) Power Operated Relief Valves (PORVs). This potential condition could adversely affect the ability to achieve and maintain a cold shutdown of Unit 2. This represented a condition reportable as per the requirements of 10 CFR 50.72(b)(3)(ii)(B). Reference Event #47764 [for Unit-2]. In accordance with 10 CFR 50.72(c)(2)(i), McGuire is reporting results of ensuing cause and extent of condition evaluation of Event #47764, which has identified a similar condition on McGuire Unit 1. This condition could result in a fire induced spurious operation of the block valves for the Unit 1 SG PORVs. This spurious operation could potentially damage these valves and render them inoperable. Since these valves are unisolable, they could not be repaired to allow the Unit 1 SGs to be used for Unit cool down if needed. This potential condition could adversely affect the ability of the plant to achieve and maintain a cold shutdown of Unit 1. This represents a condition reportable as per the requirements of 10 CFR 50.72(b)(3)(ii)(B). This potential condition is mitigated by existing compensatory measures (i.e. fire watches) which have been in place as part of McGuire's transition to NFPA 805. The licensee notified the NRC Resident Inspector.

ENS 47854 +/-
Where
McGuire North Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+0.37 h0.0154 days <br />0.0022 weeks <br />5.06826e-4 months <br />)
Opened:	Rick Jackson 22:07 Apr 19, 2012
NRC Officer:	Mark Abramovitz
Last Updated:	Apr 19, 2012
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v • d • e

v t e Emergency Notification System
McGuire with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2012-04-19T21:45:00 [Table view]
[ENS list for McGuire]

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