ENS Event | |
|---|---|
17:40 Feb 20, 2020 | |
| Title | Unanalyzed Condition - Unprotected Dc Control Circuits |
| Event Description | [On February 20, 2020, at 1240 EST, the Licensee determined the following information:]
This notification is in reference to reports EN 54130 and LER 2019-002, which were retracted. James A. FitzPatrick Nuclear Power Plant received additional information on the technical basis for the retraction. Further review, including testing of the terminal blocks, demonstrated that the short circuit current would result in heat levels in excess of cable insulation ratings. Unprotected DC control circuits for non-safety related DC motors are routed between separate fire areas. A postulated fire in one area can cause a short circuit and potentially result in secondary fires or cable fires in other fire areas where the cables are routed. The secondary fires or cable failures degrade the degree of separation for redundant safe shutdown trains and are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B). Compensatory actions per the Technical Requirements Manual (TRM) for affected fire areas have been implemented. A modification to install fuses in the control circuits for 94P-2(M), 31P-7A(M), 31P-7B(M), and 94P-13(M) has been scheduled and shall correct this condition. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
FitzPatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| LER: | 05000333/LER-2020-002 Unanalyzed Condition Due to Unprotected Control Circuits Running Through Multiple Fire Areas |
| Time - Person (Reporting Time:+-2.6 h-0.108 days <br />-0.0155 weeks <br />-0.00356 months <br />) | |
| Opened: | Henry Borick 15:04 Feb 20, 2020 |
| NRC Officer: | Richard Smith |
| Last Updated: | Feb 20, 2020 |
| 54533 - NRC Website
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WEEKMONTHYEARENS 554272021-08-24T18:06:00024 August 2021 18:06:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Appendix R Hot Short Unanalyzed Condition ENS 545332020-02-20T17:40:00020 February 2020 17:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Unprotected Dc Control Circuits ENS 541302019-06-24T22:15:00024 June 2019 22:15:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition En Revision Imported Date 10/1/2019 ENS 523292016-10-28T13:40:00028 October 2016 13:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Fire Barrier/Helb Door Inoperable ENS 494912013-10-31T21:22:00031 October 2013 21:22:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Fire Event Could Result in a Hot Short That Could Adversely Impact Safe Shutdown Equipment 2021-08-24T18:06:00 | |