ENS 50835
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ENS Event | |
|---|---|
22:00 Feb 19, 2015 | |
| Title | Unanalyzed Condition Involving Normally Closed Watertight Doors |
| Event Description | During Main Steam Safety Valve testing conducted prior to refueling outages, normally closed watertight doors are opened in support of the testing. If a postulated one square foot non-mechanistic crack were to occur within the Break Exclusion Area during the test, safety related equipment located just outside of these doors could be adversely affected. With these watertight doors open, compliance with the Comanche Peak licensing basis may not be assured.
This condition has been conservatively determined to be reportable as an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B). Currently, the watertight doors on both Units 1 and 2 are closed, therefore, all safety related equipment is currently operable. Comanche Peak Engineering is performing a review of the original Comanche Peak licensing basis regarding the non-mechanistic crack event to determine what equipment impacts are required to be assessed. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Comanche Peak  Texas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-1.7 h-0.0708 days <br />-0.0101 weeks <br />-0.00233 months <br />) | |
| Opened: | Anthony Pate 20:18 Feb 19, 2015 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Feb 19, 2015 |
| 50835 - 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 (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 528172017-06-21T15:00:00021 June 2017 15:00:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Fire Event Could Adversely Impact Safe Shutdown Equipment ENS 526462017-03-29T00:57:00029 March 2017 00:57:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition for a Postulated Moderate Energy Line Break ENS 524842017-01-11T21:00:00011 January 2017 21:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Teflon Found in Containment Spray Pump Components ENS 522442016-09-15T20:40:00015 September 2016 20:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Potential Degradation of Eccs Pump Pressure Indicators ENS 522392016-09-13T22:30:00013 September 2016 22:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Involving Station Service Water Trains ENS 522172016-09-01T15:25:0001 September 2016 15:25:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition on Turbine Driven Auxiliary Feedwater Pump ENS 517512016-02-23T23:00:00023 February 2016 23:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Involving Normally Open Battery Room Doors ENS 508352015-02-19T22:00:00019 February 2015 22:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Involving Normally Closed Watertight Doors ENS 500432014-04-18T17:52:00018 April 2014 17:52:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Cable Routing Unanalyzed for Fire Safe Shutdown Barrier ENS 494192013-10-08T17:40:0008 October 2013 17:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 477132012-03-01T23:05:0001 March 2012 23:05:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Battery Room Ventilation System Degraded ENS 473572011-10-20T01:02:00020 October 2011 01:02:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Pressure Instruments Containing Aluminum Material ENS 473522011-10-18T20:45:00018 October 2011 20:45:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Aluminum Valve Discovered Installed in Containment ENS 470862011-07-21T16:53:00021 July 2011 16:53:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Vulnerability from a Potential Control Room Fire on "a" Safeguards Bus ENS 435622007-08-13T14:00:00013 August 2007 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Inadequate Fire Protection on Safety Chilled Water System Electrical Cables 2017-06-21T15:00:00 | |
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