ENS 51751
ENS Event | |
|---|---|
23:00 Feb 23, 2016 | |
| Title | Unanalyzed Condition Involving Normally Open Battery Room Doors |
| Event Description | At CPNPP [Comanche Peak Nuclear Power Plant], eyewash stations are located just outside of the Class 1E battery rooms. The battery room doors are normally open and if a MELB [Moderate Energy Line Break] occurred on the demineralized water line connected to the eyewash station, the water could potentially spray onto the Class 1E safety related batteries. If this occurred, an electrical short could potentially cause a loss of both the batteries and the associated battery chargers.
This condition has been conservatively determined to be reportable per 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Currently, the demineralized water lines on the battery room eyewash stations for both Units 1 and 2 have been isolated, therefore, all safety related equipment is currently operable. Comanche Peak Engineering is performing a past operability review of this condition. The NRC Resident Inspector has been notified.
On February 23, 2016 at 2045 [EST], Comanche Peak reported an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B). Specifically, the reported condition involved eyewash stations that are located just outside of the Class 1E battery rooms. The battery room doors are normally open and if a Moderate Energy Line Break (MELB) occurred on the demineralized water line connected to the eyewash station, the water could potentially spray onto the Class 1E safety related batteries. If this occurred, an electrical short could have potentially caused a loss of both the batteries and the associated battery chargers. This condition was conservatively determined to be reportable per 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. The demineralized water lines on the battery room eyewash stations for both Units 1 and 2 were isolated, and Comanche Peak Engineering initiated a past operability evaluation of this condition. The past operability evaluation has been completed and shows that there are no operability concerns regarding a MELB impact on the Class 1E batteries, DC bus or Class 1E battery chargers. Therefore, Comanche Peak requests that the February 23, 2016, 10 CFR 50.72(b)(3)(ii)(B) reportable event for Units 1 & 2 be retracted. The NRC Resident Inspector has been notified. Notified the R4DO (Whitten). |
| Where | |
|---|---|
Comanche Peak  Texas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.25 h-0.0938 days <br />-0.0134 weeks <br />-0.00308 months <br />) | |
| Opened: | Anthony Pate 20:45 Feb 23, 2016 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Feb 27, 2016 |
| 51751 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 51751\u003C/a\u003E - \u003Ca href=\"/Comanche_Peak\" title=\"Comanche Peak\"\u003EComanche Peak\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EUnanalyzed Condition Involving Normally Open Battery Room Doors\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 51751 - Comanche Peak\n","link":"","lat":32.29839166666667,"lon":-97.78532222222222,"icon":"/w/images/d/d7/Luminant_icon.png"}],"imageoverlays":null} | |
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 | |