ENS 49915
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ENS Event | |
|---|---|
15:55 Mar 14, 2014 | |
| Title | Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment |
| Event Description | While evaluating IER 13-54, regarding the impact of unfused direct current (DC) circuits, a determination was made that the described condition is applicable to Edwin I. Hatch Units 1 and 2 for reactor protection system (RPS) battery/battery charger ammeter circuits. This results in an unanalyzed condition with respect to 10CFR50 Appendix R analysis requirements.
In the postulated event, a fire induced hot short could adversely impact safe shutdown equipment. The Unit 1 and 2 RPS battery/battery charger ammeter indication circuits are routed from the affected components to the main control room. It is postulated that a fire in one fire area can damage the affected cables and cause short circuits without protection that would overheat the cable and possibly result in secondary fires in other fire areas where the cables are routed. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to conduct a safe shutdown as required by 10CFR50 Appendix R. Interim compensatory measures (i.e., fire watches) have been implemented for the affected areas of the plant. This condition is being reported pursuant to 10CFR50.72(b)(3)(ii)(B). The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.28 h-0.0117 days <br />-0.00167 weeks <br />-3.83544e-4 months <br />) | |
| Opened: | Guy Griffis 15:38 Mar 14, 2014 |
| NRC Officer: | Dong Park |
| Last Updated: | Mar 14, 2014 |
| 49915 - NRC Website
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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 526502017-03-30T13:22:00030 March 2017 13:22:00
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