ENS Event | |
|---|---|
18:54 Feb 4, 2011 | |
| Title | Invalid Primary Containment Isolation System Actuation Due to a Failed Relay Coil |
| Event Description | This 60-day telephone notification is being made under reporting requirements specified by 10CFR50.73 (a)(2)(iv)(A) to describe an invalid actuation of a containment isolation signal affecting more than one system.
At 1354 on February 4, 2011, with the Duane Arnold Energy Center (DAEC) operating at 100% power, an invalid Group 3 isolation on the 'B' side of the Primary Containment Isolation System occurred. Group 3 isolation signals were generated for Primary Containment Isolation Valves for Drywell and Torus Ventilation, and Purge, Containment Nitrogen Compressor Suction and Discharge, Recirculation Pump Seals, and Post Accident Sample System. This event was caused by a high resistance contact on relays in the trip circuitry for the 'B' Fuel Pool Exhaust Radiation Monitor logic. All equipment responded in accordance with the plant design. Specifically, all actuations were complete and successful. There were no safety consequences or impacts on the health and safety of the public. The event was entered into DAEC's corrective action program for resolution. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Duane Arnold  Iowa (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1434.07 h59.753 days <br />8.536 weeks <br />1.964 months <br />) | |
| Opened: | Bob Murrell 11:58 Apr 5, 2011 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Apr 5, 2011 |
| 46724 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 531672017-12-01T04:30:0001 December 2017 04:30:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Primary Containment Isolation System Actuation ENS 491512013-05-02T18:07:0002 May 2013 18:07:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Primary Containment Isolation System (Pcis) Actuation ENS 487672012-12-20T09:54:00020 December 2012 09:54:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Primary Containment Isolation System Actuation ENS 486012012-10-21T01:20:00021 October 2012 01:20:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Primary Containment Isolation System (Pcis) Actuation ENS 469542011-04-15T01:43:00015 April 2011 01:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to Connector High Resistance ENS 467242011-02-04T18:54:0004 February 2011 18:54:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to a Failed Relay Coil ENS 433872007-04-01T07:49:0001 April 2007 07:49:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation Due to a Failed Relay Coil ENS 417602005-04-14T20:40:00014 April 2005 20:40:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation While Performing Re-Termination. ENS 417592005-04-14T11:13:00014 April 2005 11:13:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation During Post Maintenance Testing 2017-12-01T04:30:00 | |