ENS 54391

v t e ENS Event
04:53 Nov 16, 2019
Title	Temporary Loss of Control Room Envelope Boundary
Event Description	At 2353 EST on November 15, 2019, a Main Control Room (MCR) alarm was received for low control room positive pressure. At 2355 EST, 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. Watts Bar Unit 1 and Unit 2 entered Condition B. At 2355 EST on November 15, 2019, the alarm cleared, CREVS was declared operable and LCO 3.7.10 Condition B was exited for both units. This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. See similar EN #54390. The licensee has taken compensatory measures while investigating the cause.

ENS 54391 +/-
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:+-1.85 h-0.0771 days <br />-0.011 weeks <br />-0.00253 months <br />)
Opened:	Justin Gallagher 03:02 Nov 16, 2019
NRC Officer:	Michael Bloodgood
Last Updated:	Nov 16, 2019
54391 - NRC Website
v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2021-03-01T20:11:00 [Table view]
[ENS list for Watts Bar]

Navigation menu