ENS 52436: Difference between revisions

v t e ENS Event
07:39 Oct 28, 2016
Title	Invalid Actuation Of Containment Isolation Valves
Event Description	This telephone notification is being made in lieu of a Licensee Event Report in accordance with 10CFR50.73(a)(1) to notify the NRC of on invalid actuation of a group isolation, reportable under 10CFR50.73(a)(2)(iv)(A). On October 28, at 0139 Central Daylight Time, electricians were removing a test jack from a terminal on a primary containment isolation system relay due to the test jack being installed on the wrong relay. During removal of the test jack, a neutral wire came out of the terminal causing multiple relay actuations resulting in a half Group 2 isolation signal on the Division 2 side. Because of the plant being in Mode 5, refueling, the only isolation valves that closed because of the invalid isolation signal were the Division 2 isolation valves associated with the drywell ventilation monitor and the drywell floor and equipment sumps. The specific train and system actuated was the Primary Containment Isolation System [PCIS] Division 2 portion of the Group 2 isolation circuit (i.e. half group isolation). This was a partial actuation affecting only half of the logic and causing isolation of two systems. Based on the inadvertent actuation of the affected PCIS relays, the system isolated and functioned as expected. The isolation signal was reset at 0230 and the affected systems restored to service. The licensee notified the NRC Resident Inspector.

ENS 52436 +/-
Where
Cooper Nebraska (NRC Region 4)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1153.73 h48.072 days <br />6.867 weeks <br />1.58 months <br />)
Opened:	David Van Der Kamp 10:23 Dec 15, 2016
NRC Officer:	Mark Abramovitz
Last Updated:	Dec 15, 2016
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v • d • e

v t e Emergency Notification System
Cooper with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2025-10-06T15:13:00 [Table view]
[ENS list for Cooper]

Revision as of 17:15, 24 September 2017