ENS Event | |
|---|---|
22:15 Jun 24, 2019 | |
| Title | Potential Unanalyzed Condition Due to Unprotected Control Circuits Running Through Mutilple Fire Areas |
| Event Description | During a review of industry Operating Experience it was identified that there were unprotected DC control circuits for
non safety-related DC motors which are routed from the Battery Charger Rooms to other separate fire areas. Circuit Breakers used to protect the motor power conductors appear to be inadequate to protect the control conductors. The concern is that under fire safe shutdown conditions, it is postulated that a fire in one area can cause short circuits potentially resulting in secondary fires or cable fires in other fire areas where the cables are routed. The secondary fires or cable failures are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis. This condition is reportable as an 8-hour ENS report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Requirements of the Technical Requirements Manual (TRM) for the affected fire areas will be implemented." The licensee has notified the NRC resident inspector. |
| Where | |
|---|---|
Fitzpatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.95 h-0.0396 days <br />-0.00565 weeks <br />-0.0013 months <br />) | |
| Opened: | John Walkowiak 21:18 Jun 24, 2019 |
| NRC Officer: | Thomas Kendzia |
| Last Updated: | Jun 24, 2019 |
| 54130 - 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 | |