ENS 56787

v t e ENS Event
04:00 Jun 18, 2023
Title	60 Day Notification for an Invalid Specified System Actuation
Event Description	The following information was provided by the licensee via phone and email: This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid specific system actuation of the North Anna Power Station Unit 1 Emergency Core Cooling System (ECCS). On 6/18/2023, a comparator card power supply associated with 1-CH-PC-1121A, charging pressure low-standby pump start signal comparator, failed and caused the `A' and `B' charging pumps to auto-start and the previously running `C' charging pump to trip and lock-out. This event is considered an invalid system actuation because the actuation was not initiated in response to actual plant conditions or parameters and was not a manual initiation. The ECCS pumps functioned as expected in response to the actuation. The `A' Charging pump was shut down in accordance with plant procedures following replacement of the comparator card. There was no impact on the health and safety of the public or plant personnel. The reportability requirement was determined beyond the 60-day notification requirement on 9/21/2023. The NRC Resident Inspector has been notified.

ENS 56787 +/-
Where
North Anna Virginia (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+2767 h115.292 days <br />16.47 weeks <br />3.79 months <br />)
Opened:	Bob Page 11:00 Oct 11, 2023
NRC Officer:	Ernest West
Last Updated:	Oct 11, 2023
56787 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
North Anna with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-06-18T04:00:00 [Table view]
[ENS list for North Anna]

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