ENS 53044
ENS Event | |
|---|---|
13:42 Oct 30, 2017 | |
| Title | Temporary Loss of Control Room Envelope Boundary |
| Event Description | At 0942 Eastern Daylight Time (EDT) on October 30, 2017, a Main Control Room (MCR) alarm was received for low control room positive pressure.
At 0943 EDT, a Control Room Envelope (CRE) door was found ajar and immediately closed. Technical Specification 3.7.10 Control Room Emergency Ventilation System (CREVS) was declared not met for both trains and Condition B entered. At 0945 EDT the alarm cleared, CREVS was declared operable and LCO 3.7.10, Condition B was exited. The safety function of the CRE boundary is to ensure the in-leakage of unfiltered air into the CRE will not exceed the in-leakage assumed in the licensing basis analysis of Design Basis Accident (DBA) consequences to CRE occupants. From 0942 EDT to 0943 EDT WBN [Watts Bar Nuclear] was unable to validate that CREVS could fulfill its required Safety Function. This event is being reported pursuant to 10 CFR 50.72(b)(3)(v)(D). NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+2.13 h0.0888 days <br />0.0127 weeks <br />0.00292 months <br />) | |
| Opened: | Brian Mcilnay 15:50 Oct 30, 2017 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Oct 30, 2017 |
| 53044 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |