ENS 53106
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ENS Event | |
|---|---|
14:58 Dec 6, 2017 | |
| Title | Diesel Fuel Oil Tank Supply Non-Conforming with Licensing Basis for Tornado Generated Missiles |
| Event Description | On December 6, 2017, during evaluation of protection for Technical Specification (TS) equipment from the damaging effects of tornado generated missiles, Three Mile Island Nuclear Station identified a non-conforming condition in the plant design such that specific TS equipment is considered to not be adequately protected from tornado generated missiles. A tornado could generate a missile that could strike the emergency diesel generator (EDG) fuel oil supply tank (DFT) vent stack. This could result in crimping of the stack, which could affect the ability of the DFT to perform its design function if such a tornado would occur.
This condition is reportable per 10 CFR 50.72(b)(3)(ii)(B) for any event or condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety, and per 10 CFR 50.72(b)(3)(v)(D) for any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. This condition is being addressed in accordance with NRC enforcement guidance provided in EGM 15-002 and DSS-ISG-2016-01. Compensatory measures have been implemented in accordance with these documents. The NRC Resident Inspector has been informed of this notification. |
| Where | |
|---|---|
Three Mile Island  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000289/LER-2017-004 |
| Time - Person (Reporting Time:+-2.27 h-0.0946 days <br />-0.0135 weeks <br />-0.00311 months <br />) | |
| Opened: | Michael Fitzwater 12:42 Dec 6, 2017 |
| NRC Officer: | Steven Vitto |
| Last Updated: | Dec 6, 2017 |
| 53106 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Three Mile Island with 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 | |
WEEKMONTHYEARENS 531062017-12-06T14:58:0006 December 2017 14:58:00
[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)(ii)(B), Unanalyzed Condition Diesel Fuel Oil Tank Supply Non-Conforming with Licensing Basis for Tornado Generated Missiles ENS 520492016-06-28T14:55:00028 June 2016 14:55:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both a & B Trains Hpi Inoperable Due to Void in Common Suction Line Resulting in Loss of Safety Function ENS 501082014-05-12T14:20:00012 May 2014 14:20:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 500592014-04-25T15:13:00025 April 2014 15:13:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 472942011-09-26T19:00:00026 September 2011 19:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition New River Hydraulic Analysis Raises Maximum Flood Level ENS 431392007-02-02T18:50:0002 February 2007 18:50:00 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 Low Pressure Injection (Lpi) Net Positive Suction Head Flow Requirements Not Met for Certain Accident Sequences ENS 425272006-04-25T17:30:00025 April 2006 17:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Control Logic Error ENS 424752006-04-05T12:04:0005 April 2006 12:04:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Trains of High Pressure Injection (Hpi) Declared Inoperable Due to Potential Air Binding of Pumps ENS 416632005-05-03T17:10:0003 May 2005 17:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Appendix R Fire Scenario Involving Multiple High Impedance Faults ENS 414442005-02-16T01:55:00016 February 2005 01:55:00 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 Possible Failure to Meet Design Basis Requirements of Positive Pressure in the Control Tower Envelope Following a Design Basis Accident. 2017-12-06T14:58:00 | |
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