ENS 55188

v t e ENS Event
03:20 Feb 18, 2021
Title	Automatic Actuation of Group 2 Containment Isolation Logic
Event Description	At 2320 EST on 02/17/2021, with Unit 2 in Mode 5 at zero percent power, an actuation of the Group 2 containment isolation logic occurred on the inboard valves. The reason for the actuation was most likely due to air entrapment in reactor water level sensing lines following maintenance. Group 2 inboard isolation valves in the drywell floor and equipment drain system and the fission product monitor system automatically isolated as designed. As a corrective action, the variable leg and reference leg of the instrumentation were backfilled with water to ensure all air was removed from the line. This event is being reported in accordance with 10 CFR 50.73(a)(2)(iv)(A) as an event that results in an invalid actuation of the Group 2 containment isolation system. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

ENS 55188 +/-
Where
Hatch Georgia (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1278.95 h53.29 days <br />7.613 weeks <br />1.752 months <br />)
Opened:	Kevin Carter 09:17 Apr 12, 2021
NRC Officer:	Kerby Scales
Last Updated:	Apr 12, 2021
55188 - NRC Website
v • d • e

v t e Emergency Notification System
Hatch with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-11-02T01:11:00 [Table view]
[ENS list for Hatch]

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