ENS 49727
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ENS Event | |
|---|---|
13:23 Jan 15, 2014 | |
| Title | Drywell Radiation Monitor Inoperable |
| Event Description | At 0723 [CST] hours on January 15, 2014, the 2A Drywell Radiation Monitor was declared inoperable after exhibiting erratic performance. This monitor provides the input into one division of the primary containment isolation logic for a Group II isolation. As a result, the channel was placed in a tripped condition in accordance with Technical Specification 3.3.6.1, Condition B.
Given both divisions are required to complete the Group II isolation logic, this condition is reportable in accordance with 10 CFR 50.72(b)(3)(v)(C) as an event or condition that could have prevented the fulfillment of a safety function. The 2A Drywell Radiation Monitor has been repaired and restored to an operable condition. The NRC Resident Inspector has been notified.
The purpose of this notification is to retract the ENS notification made on January 15, 2014 (ENS 49727). Upon further investigation it was verified that the Drywell Radiation Monitors do not mitigate the consequences of an accident as discussed in Chapters 6 and 15 of the Updated Final Safety Analysis Report and the Technical Specifications Bases for 3.3.6.1. Therefore, the threshold for reporting the issue as an event or condition that could have prevented the fulfillment of a safety function was not met (NUREG 1022 Revision 3 - Event Report Guidelines Section 3.2.7). The NRC Resident Inspector has been notified. Notified the R3DO (Orlikowski). |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+2.4 h0.1 days <br />0.0143 weeks <br />0.00329 months <br />) | |
| Opened: | James Burke 15:47 Jan 15, 2014 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Feb 7, 2014 |
| 49727 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Quad Cities with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 559762022-07-04T06:30:0004 July 2022 06:30:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Trains of Standby Gas Treatment Inoperable ENS 531892018-01-31T19:10:00031 January 2018 19:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 525082017-01-24T16:00:00024 January 2017 16:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Interlock Doors Open Simultaneously ENS 516592016-01-16T02:38:00016 January 2016 02:38:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 516502016-01-12T19:40:00012 January 2016 19:40:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 511652015-06-19T06:53:00019 June 2015 06:53:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Interlock Doors Open Simultaneously ENS 510212015-04-28T14:35:00028 April 2015 14:35:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Two Secondary Containment Interlock Doors Open Simultaneously ENS 508032015-02-10T16:55:00010 February 2015 16:55:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Interlock Doors Open Simultaneously ENS 506222014-11-18T15:00:00018 November 2014 15:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Interlock Doors Open Simultaneously ENS 501322014-05-23T02:50:00023 May 2014 02:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Hpci Secondary Containment Airlock Doors Open Simultaneously ENS 499842014-04-01T18:57:0001 April 2014 18:57:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Unit 2 Secondary Containment Interlocked Doors Opened Simultaneously ENS 498702014-03-05T01:17:0005 March 2014 01:17:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 497272014-01-15T13:23:00015 January 2014 13:23:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Drywell Radiation Monitor Inoperable ENS 485272012-11-20T19:21:00020 November 2012 19:21:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Drywell Radiation Monitor Inoperable ENS 483322012-09-21T19:49:00021 September 2012 19:49:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Drywell Radiation Monitor Inoperable ENS 482822012-09-06T18:14:0006 September 2012 18:14:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Ventilation for Eight Seconds 2022-07-04T06:30:00 | |
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