ENS 52436: Difference between revisions
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| event date = 10/28/2016 01:39 CST | | event date = 10/28/2016 01:39 CST | ||
| last update date = 12/15/2016 | | last update date = 12/15/2016 | ||
| title = Invalid Actuation | | title = Invalid Actuation of Containment Isolation Valves | ||
| event text = 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). | | event text = 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. | 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. | ||
Latest revision as of 21:43, 1 March 2018
| 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 |
| 52436 - NRC Website
| |