ENS 55311

v t e ENS Event
19:50 Jun 16, 2021
Title	Atmospheric Steam Dump Valves Inoperable
Event Description	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.

ENS 55311 +/-
Where
Palisades 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:+3.85 h0.16 days <br />0.0229 weeks <br />0.00527 months <br />)
Opened:	Barb Dotson 23:41 Jun 16, 2021
NRC Officer:	Thomas Kendzia
Last Updated:	Jun 17, 2021
55311 - NRC Website
v • d • e

v t e Emergency Notification System
Palisades with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2021-06-16T19:50:00 [Table view]
[ENS list for Palisades]

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