ENS 47357
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ENS Event | |
|---|---|
01:02 Oct 20, 2011 | |
| Title | Unanalyzed Condition Due to Pressure Instruments Containing Aluminum Material |
| Event Description | With Unit 1 in Mode 4 and Unit 2 in Mode 1 an issue was identified with the body material of existing installed pressure instruments for both the Personnel and Emergency Airlocks of both units. The pressure instruments were determined to have an aluminum body which is not suited for safety related use in containment.
Aluminum is a restricted/limited material in containment because it is not compatible with accident conditions and has failures with multiple adverse effects. Due to this condition, the pressure instruments would potentially lose pressure integrity during a LOCA with containment spray actuation. These pressure instruments are located inside containment and are connected to tubing that penetrates the airlock barrel. In event of a failure of any pressure instrument the integrity of the airlock would be compromised. The containment air locks form part of the containment pressure boundary and, as such, a loss of pressure boundary integrity would no longer meet general design criteria. Compensatory measures have been taken to prevent a failure of the airlock integrity due to containment spray actuation and at this time the airlock is operable. Luminant power determined this to be reportable at 2002 on 10/19/11 per 50.72(b)(3)(ii)(B) Comanche Peak Units 1 and 2 being in an unanalyzed condition that significantly degrades plant safety. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Comanche Peak  Texas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| LER: | 05000445/LER-2011-003 |
| Time - Person (Reporting Time:+-1.45 h-0.0604 days <br />-0.00863 weeks <br />-0.00199 months <br />) | |
| Opened: | Raul Martinez 23:35 Oct 19, 2011 |
| NRC Officer: | Vince Klco |
| Last Updated: | Oct 19, 2011 |
| 47357 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Standby (0 %) |
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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