ENS 49870
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ENS Event | |
|---|---|
01:17 Mar 5, 2014 | |
| Title | Momentary Loss of Secondary Containment |
| Event Description | At 1917 hours0.0222 days <br />0.533 hours <br />0.00317 weeks <br />7.294185e-4 months <br /> [CST] on March 4, 2014, the Unit 1B fuel pool radiation monitor spiked high due to an invalid actuation which caused the U1 and U2 reactor building ventilation system to isolate (the control room ventilation system also isolated as designed). The Standby Gas Treatment system was already in operation for a scheduled surveillance as of 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on March 4, 2014. During the ensuing pressure transient, the Reactor Building differential pressure momentarily went positive. As a result, Secondary Containment was declared inoperable.
Given the temporary loss in secondary containment, this event is reportable under 10CFR50.72(b)(3)(v)(C) as an event or condition that could have prevented the fulfillment of a safety function. The NRC Resident Inspector has been notified. After the transient, the reactor building ventilation system was shutdown for scheduled maintenance and the control room ventilation system was returned to its normal configuration. The Standby Gas Treatment system was operating to support planned reactor building ventilation system maintenance. Troubleshooting of the radiation monitor spike is underway. |
| Where | |
|---|---|
| Quad Cities Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| LER: | 05000254/LER-2014-001 Secondary Containment Differential Pressure Momentarily Lost Due to Fuel Pool Radiation Monitor Spike |
| Time - Person (Reporting Time:+0.33 h0.0138 days <br />0.00196 weeks <br />4.52034e-4 months <br />) | |
| Opened: | Kevin Holle 01:37 Mar 5, 2014 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Mar 5, 2014 |
| 49870 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (95 %) |
| After | Power Operation (95 %) |
Quad Cities | |
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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