ENS 52650
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ENS Event | |
|---|---|
13:22 Mar 30, 2017 | |
| Title | Unanalyzed Condition Due to Potential Tornado Generated Missiles |
| Event Description | During the evaluation of tornado missile vulnerabilities and the potential impacts to safety-related plant equipment, it was concluded that the following structures are vulnerable to tornado generated missiles:
All five of the Unit 1 and Unit 2 Emergency Diesel Generator (EDG) fuel oil storage tanks have ventilation pipe extending approximately 5 feet above grade. In the event that a tornado missile impact occurs on the aforementioned ventilation piping, there is a possibility that the vent lines could crimp. This could prevent the tanks from venting and inhibit the transfer of fuel oil from the main fuel oil storage tanks to the day tank. Ultimately, this causes the emergency diesels to be inoperable. These conditions are reportable per 10 CFR 50.72(b)(3)(ii)(B) and 10 CFR 50.72(b)(3)(v)(D) for any event or condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety and also an event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequence of an accident. This issue is being addressed in accordance with EGM-15-002, Revision 1, Enforcement Discretion for Tornado-Generated Missile Protection Noncompliance. The NRC Resident Inspector has also been notified. |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
| Opened: | Guy Griffis 12:58 Mar 30, 2017 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Mar 30, 2017 |
| 52650 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (97 %) |
| After | Power Operation (97 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 526502017-03-30T13:22:00030 March 2017 13:22:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Potential Tornado Generated Missiles ENS 525312017-02-03T19:58:0003 February 2017 19:58:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Appendix R Fire Analysis ENS 511202015-06-04T14:03:0004 June 2015 14:03:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition for a Postulated Fire ENS 510702015-05-14T20:00:00014 May 2015 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Excessive Toxic Chemicals Onsite ENS 506622014-12-09T23:25:0009 December 2014 23:25:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Non-Functional Fire Barrier Discovered Affecting Both Safe Shutdown Paths ENS 506292014-11-19T21:18:00019 November 2014 21:18:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Penetration Not Meeting Requirements ENS 504552014-09-13T07:07:00013 September 2014 07:07:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Penetration Did Not Meet Appendix R Requirements ENS 503512014-08-07T21:07:0007 August 2014 21:07:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Discovery of Degraded Fire Barrier Walls ENS 509982014-08-07T21:07:0007 August 2014 21:07:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition This Is a Continuation of En #50351 ENS 510912014-08-07T21:07:0007 August 2014 21:07:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition This Is a Continuation of En #50351 and En #50998 ENS 501602014-05-30T20:10:00030 May 2014 20:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Grouting in Fire Penetrations Does Not Meet Requirements ENS 499152014-03-14T15:55:00014 March 2014 15:55:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 496072013-12-04T20:40:0004 December 2013 20:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition a Potential Electrical Hot Short in the Rhr Shutdown Cooling Control Cable Could Result in an Inter-System Loca ENS 492852013-08-15T20:10:00015 August 2013 20:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition a Hot Short in the Rhr Shutdown Cooling Control Cable Could Result in an Inter-System Loca ENS 439922008-02-18T06:20:00018 February 2008 06:20:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to #2 Turbine Bypass Valve Failure ENS 435032007-07-18T16:20:00018 July 2007 16:20:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 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 Unanalyzed Condition - Vent Space Less than Design Basis ENS 434992007-07-17T12:00:00017 July 2007 12:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Vent Space Less than Design Basis 2017-03-30T13:22:00 | |
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