19:50 Jun 16, 2021
Atmospheric Steam Dump Valves Inoperable
On June 16, 2021, at 1550 EDT, Palisades Nuclear Plant was operating in Mode 1 at 100% power. At that time, operations identified an acrid odor in the control room. Investigation revealed that the steam dump control relay had failed, rendering all four atmospheric steam dump valves inoperable.
The loss of function of all four atmospheric steam dump valves is reportable in accordance with 10 CFR 50.72(b)(3)(v)(D) as an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
Troubleshooting and replacement of the relay are in progress.
The plant remains stable in Mode 1 at 100% power.
The NRC Resident Inspector has been notified.Unit 1 is in a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LCO for Tech Spec 3.7.4.b, atmospheric steam dump valve inoperability. The Unit is in a normal offsite power line-up.
Michigan (NRC Region 3)
|10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident|
|Time - Person (Reporting Time:+3.85 h0.16 days <br />0.0229 weeks <br />0.00527 months <br />)|
23:41 Jun 16, 2021
|NRC Officer:||Thomas Kendzia|
|Last Updated:||Jun 17, 2021|
|55311 - NRC Website|