16:03 Sep 25, 2019
High Pressure Coolant Injection Declared Inoperable
At 1203 EDT, on September 25, 2019, during a Division 2 Emergency Equipment Service Water (EESW) pump and valve surveillance test, the Division 2 Emergency Equipment Cooling Water (EECW) Temperature Control Valve was found to be approximately 80 percent open rather than in its required full open position during fail safe testing. The Division 2 EESW system is required to support operability of the Division 2 EECW system. The Division 2 EECW system cools various safety related components, including the High Pressure Coolant Injection (HPCI) system room cooler. An unplanned HPCI inoperability occurred based on a loss of the HPCI Room Cooler. An investigation is underway into the cause of the failure. This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D) based on an unplanned HPCI inoperability.
The NRC Senior Resident Inspector has been notified.
The licensee is in 72-hour shutdown action statement.
Subsequent engineering evaluation has determined that the EECW TCV was capable of passing sufficient flow to perform its design basis functions, including supporting the HPCI room cooler, while approximately 80% open. Therefore, HPCI remained operable and there was no loss of safety function. The event did not involve a condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident under 10 CFR 50.72(b)(3)(v)(D).
The NRC Resident Inspector has been notified.Notified R3DO (Cameron).
Michigan (NRC Region 3)
|10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident|
|LER:||look for an ler...|
|Time - Person (Reporting Time:+-0.55 h|
15:30 Sep 25, 2019
|NRC Officer:||Ossy Font|
|Last Updated:||Nov 22, 2019|
|54293 - NRC Website|