ENS 55130
ENS Event | |
|---|---|
16:52 Jan 11, 2021 | |
| Title | 60-Day Optional Telephonic Notification for Invalid Containment Ventilation Isolation Actuation |
| Event Description | This 60-day telephone notification is being submitted in accordance with 10 CFR 50.73(a)(1) and 50.73(a)(2)(iv)(A). The event was an invalid actuation of the Unit 1 Containment Ventilation Isolation (CVI) system.
On January 11, 2021 at 1152 Eastern Standard Time (EST) with Unit 1 at 100% power, Train 'A' of the CVI System actuated due to an invalid high radiation signal from 1-RM-90-130, Containment Purge Air Exhaust Monitor. The cause of the signal was determined to be a failed sample pump associated with the radiation monitor. 1-RM-90-130 was in service at the time of the invalid signal. The Train 'A' Containment Ventilation Isolation signal was a full actuation of that train and the system functioned as designed. Prior to and following the invalid high radiation alarms, all radiation monitors except 1-RM-90-130 were stable at their normal values; therefore, the CVI was invalid. Control room operators performed appropriate checks and confirmed that all required automatic actuations occurred as designed. The failed pump was replaced and returned to service. This event was entered into the corrective action program as CR 1663398. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Sequoyah  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1363.1 h56.796 days <br />8.114 weeks <br />1.867 months <br />) | |
| Opened: | Ryan Radel 11:58 Mar 9, 2021 |
| NRC Officer: | Brian Lin |
| Last Updated: | Mar 9, 2021 |
| 55130 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 551302021-01-11T16:52:00011 January 2021 16:52:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for Invalid Containment Ventilation Isolation Actuation ENS 514512015-08-07T23:19:0007 August 2015 23:19:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification for an Invalid Containment Isolation Activation ENS 511172015-04-12T17:20:00012 April 2015 17:20:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Containment Isolation Activation. ENS 470222011-06-04T19:17:0004 June 2011 19:17:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Caused All 4 Emergency Diesel Generators to Start ENS 472492011-05-05T19:20:0005 May 2011 19:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 465042010-11-14T10:09:00014 November 2010 10:09:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Turbine Driven Auxiliary Feedwater Pump ENS 450852009-04-09T05:15:0009 April 2009 05:15:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Telephone Report of an Invalid Start of All Four Emergency Diesel Generators 2021-01-11T16:52:00 | |