ENS 55427
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ENS Event | |
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18:06 Aug 24, 2021 | |
Title | Appendix R Hot Short Unanalyzed Condition |
Event Description | During an extent of condition review of DC control circuits, it was identified there are additional unprotected DC control circuits which are routed between separate Appendix R 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 for affected fire areas have been implemented. Design modifications in the affected control circuits are being developed and will be scheduled to correct this condition. |
Where | |
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Fitzpatrick New York (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-1.25 h-0.0521 days <br />-0.00744 weeks <br />-0.00171 months <br />) | |
Opened: | Andrew Weaver 16:51 Aug 24, 2021 |
NRC Officer: | Brian P. Smith |
Last Updated: | Aug 24, 2021 |
55427 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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 | |
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