ENS 40373
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ENS Event | |
|---|---|
18:30 Dec 3, 2003 | |
| Title | Emergency Procedure Deficiency Causes Unanalyzed Condition |
| Event Description | While reviewing operator emergency response times contained in Callaway Plant's Final Safety Analysis Report (FSAR), it was determined that emergency procedure E-0 did not contain specific guidance for actions to be taken when one train of Control Room Emergency Ventilation System (CREVS) failed to properly operate. In FSAR Chapter 15A, the limiting single failure analyzed for the CREVS is the failure of a filtration fan within one train of CREVS. In this accident analysis scenario, a Control Room Filtration Unit fan fails and the train must be secured to prevent inadequately filtered Control Building air from being introduced into the Control Room. If the train is not isolated within 30 minutes, postulated dose to Control Room staff could potentially exceed GDC 19 limits.
While procedure E-0 addressed identifying faulted CREVS equipment and an attempted restoration of the faulted equipment, it did not contain sufficient guidance to ensure the Control Room staff would isolate the faulted train of CREVS if the equipment restoration attempt failed. A revision to procedure E-0 has been issued to correct this procedural deficiency. The licensee has notified the NRC Resident Inspector.
This notification is being retracted. Further evaluations concluded that a local area radiation monitor would have alerted the Control Room staff to a developing adverse condition in sufficient time for operators to have identified and isolated the faulted CREVS train prior to exceeding regulatory dose limits. This event does not represent an unanalyzed condition reportable per 10CFR50.72(b)(3)(ii)(B)." The NRC Resident Inspector was notified of this retraction by the licensee. Notified R4 DO (A. Gody) |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-1.1 h-0.0458 days <br />-0.00655 weeks <br />-0.00151 months <br />) | |
| Opened: | David Lantz 17:24 Dec 3, 2003 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Feb 2, 2004 |
| 40373 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 548062020-07-30T13:15:00030 July 2020 13:15:00
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