ENS 55558

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v t e ENS Event
06:41 Jun 3, 2021
Title	High Pressure Coolant Injection Inoperable Due to LOW Level Instrumentation
Event Description	At 0241 [EDT] on June 3, 2021, during performance of a High Pressure Coolant Injection (HPCI) Condensate Storage Tank (CST) level functional surveillance, the HPCI torus suction inboard isolation valve was slow to open during swap of suction from the CST to the Torus. On June 9, 2021, it was determined that as a result of the June 3, 2021, slow swap condition, TS 3.3.5.1 Required Action D.1 to declare HPCI inoperable within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> was applicable due to inoperable CST low level instrumentation channels. At 1817 [EDT] on June 3, 2021, HPCI suction was swapped to the torus, making TS Required Action D.1 no longer applicable. Reactor Core Isolation Cooling (RCIC) was available throughout this condition. At 0900 [EDT] on November 3, 2021, it was determined that an NRC event report due to HPCI inoperability should have been made. This event is being reported as a late 8-hour non-emergency notification pursuant to 10CFR50.72(b)(3)(v)(D) based on an unplanned HPCI inoperability. The cause of the slow valve opening was later determined to be corrosion products on contacts of a relay in the CST low level instrumentation logic. On June 4, 2021 at 1451 [EDT], the HPCI CST Level Functional Test was completed Satisfactorily, restoring HPCI Instrumentation to Operable. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

ENS 55558 +/-
Where
Fermi Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+3678.95 h153.29 days <br />21.899 weeks <br />5.039 months <br />)
Opened:	N. Schafer 13:38 Nov 3, 2021
NRC Officer:	Michael Bloodgood
Last Updated:	Nov 3, 2021
55558 - NRC Website
v • d • e

v t e Emergency Notification System
Fermi with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-06-13T03:33:00 [Table view]
[ENS list for Fermi]

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