ENS 57652: Difference between revisions

v t e ENS Event
00:00 Apr 8, 2025
Title	Auxiliary Feedwater System Inoperable
Event Description	The following information was provided by the licensee via phone and email: On April 7, 2025, at 2000 EDT, it was discovered that all pumps in the auxiliary feedwater system were inoperable due to the loss of control power to the `B' train emergency feedwater (EFW) flow control valve which supplies the `D' Steam Generator. The redundant `A' Train EFW flow control valve for the `D' Steam Generator remains functional, as well as the capability of the auxiliary feedwater system to supply all steam generators. The `A' and `B' EFW flow control valves are arranged in a series configuration for each steam generator. Failure of any of the 8 EFW flow control valves to meet its surveillance requirements will render all EFW pumps inoperable per technical specifications (TS). This condition is being reported pursuant to 10 CFR 50.72(b)(3)(v)(B). The NRC Resident Inspector has been notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: Troubleshooting is ongoing for the cause of the loss of control power. The licensee is currently in TS limiting condition for operation 3.7.1.2 action statement 'D' to restore at least one auxiliary feedwater pump to operable status as soon possible.

ENS 57652 +/-
Where
Seabrook New Hampshire (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
Time - Person (Reporting Time:+1.73 h0.0721 days <br />0.0103 weeks <br />0.00237 months <br />)
Opened:	Jack Connolly 01:44 Apr 8, 2025
NRC Officer:	Jon Lilliendahl
Last Updated:	Apr 8, 2025
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v • d • e

v t e Emergency Notification System
Seabrook with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
WEEKMONTHYEAR2025-04-08T00:00:00 [Table view]
[ENS list for Seabrook]

Revision as of 06:20, 9 April 2025