ENS Event | |
|---|---|
18:22 Nov 14, 2013 | |
| Title | Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment |
| Event Description | A review of industry operating experience regarding the impact of unfused Direct Current (DC) ammeter circuits has determined the described condition is applicable to the Salem Nuclear Power Plant resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R. The original plant wiring design and associated analysis for ammeters associated with the station batteries are not provided with overcurrent protection features to limit the fault current.
A postulated fire that results in a short to ground concurrent with an opposite polarity short from the same battery could result in excessive current flow (i.e., heating) in the ammeter wiring. This excessive current could result in a secondary fire in another fire area. The secondary fire could adversely affect safe shutdown equipment and cause loss of the ability to conduct a safe shutdown as required by 10 CFR 50 Appendix R. The areas affected are the Control Room, Relay Rooms and 460 Volt Switchgear Rooms. This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B). Interim compensatory measures (i.e., fire watches) have been implemented for the affected areas of the plant. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Salem  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.23 h-0.0929 days <br />-0.0133 weeks <br />-0.00305 months <br />) | |
| Opened: | Kelly Johnson 16:08 Nov 14, 2013 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Nov 14, 2013 |
| 49539 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 534382018-06-01T04:00:0001 June 2018 04:00:00
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