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    NRC Issues Event Notification for Monticello Nuclear Plant in Minn.


    January 25, 2022 - Targeted News Service

     

      WASHINGTON, Jan. 24 -- The Nuclear Regulatory Commission issued the following event notification (No. 55708) involving Monticello Nuclear Plant, Minnesota:

      INVALID ACTUATION OF SECONDARY CONTAINMENT RELAYS

      The following information was provided by the licensee via email:

      "This telephone notification is provided in accordance with 10 CFR 50.73(a)(1) to report an invalid actuation of secondary containment relays in accordance with 10 CFR 50.73(a)(2)(iv)(A).

      "On November 29, 2021, the `B' Fuel Pool radiation monitor spiked high during restoration following the performance of the 0068 procedure `Spent Fuel Pool & Reactor Building Exhaust Plenum Monitor Calibration' due to cable to radiation monitor connector degradation from handling. This resulted in a Partial Primary Containment Group II isolation (gas systems), initiation of Standby Gas Treatment system, and isolation of the Reactor Building Ventilation system.

      "All systems responded as designed to the actuation signal. Operations reset the Partial Primary Containment Group II isolation signal, shutdown Standby Gas Treatment System, and restored Reactor Building Ventilation system per procedures.

      "At the time of the occurrence, the `A' Fuel Pool radiation monitor was reading normal at approximately 1.5 mr/hr. The `B' Fuel Pool radiation monitor spiked above the 50 mr/hr setpoint and continued to read erratically. Work was performed to clean and reconnect the connector and testing per 0068 procedure verified the condition was corrected. The `B' Fuel Pool radiation monitor returned to service.

      "There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."

      Power Reactor

      Event Number: 55708

      Facility: Monticello

      Region: 3

      State: MN

      Unit: [1] [] []

      RX Type: [1] GE-3

      NRC Notified By: Jason Brevig

      HQ OPS Officer: Mike Stafford

      Notification Date: 01/21/2022

      Notification Time: 10:25 [ET]

      Event Date: 11/29/2021

      Event Time: 11:28 [CST]

      Last Update Date: 01/21/2022

      Emergency Class: Non Emergency

      10 CFR Section:

      50.73(a)(1) - Invalid Specif System Actuation

      Person (Organization):

      Stoedter, Karla (R3)

      Table omitted: https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/2...

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