ENS 47713
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ENS Event | |
|---|---|
23:05 Mar 1, 2012 | |
| Title | Battery Room Ventilation System Degraded |
| Event Description | While Units 1 and 2 were in Mode 1, operating at 100% power, an issue was identified with the doors for the safety related battery rooms and their normal position. Several doors to the battery rooms were found to be held open via electromagnetic door devices. These doors are an integral part of their battery room exhaust system. As designed, there is no uninterruptible power to the door mechanisms, all the doors are expected to close in the event of a Loss of Offsite Power.
The closure of the doors to the battery rooms, being an integral part of the exhaust system, would disrupt ventilation in the battery rooms and could allow hydrogen to increase to unacceptable levels during Loss of Offsite Power events. Compensatory measures have been taken to secure the doors open to maintain the hydrogen purging function before required limits are reached. The battery room ventilation system remains functional supporting operability of the batteries. Luminant Power determined this issue to be reportable as an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B). The licensee will notify the NRC Resident Inspector. |
| Where | |
|---|---|
Comanche Peak  Texas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-4.4 h-0.183 days <br />-0.0262 weeks <br />-0.00603 months <br />) | |
| Opened: | Raul Martinez 18:41 Mar 1, 2012 |
| NRC Officer: | John Knoke |
| Last Updated: | Mar 1, 2012 |
| 47713 - NRC Website | |
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 528172017-06-21T15:00:00021 June 2017 15:00:00
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