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EN Revision Text: TEMPORARY PROCESS RADIATION MONITORING SAMPLE CART NON FUNCTIONAL At 1245 PST, on November 23, 2019, the Turbine Building Process Radiation Monitoring Sample Rack (TEA-SR-26) was declared non-functional and taken out of service to perform planned preventive maintenance per procedure. The temporary sample cart was placed in service as an alternate method per plant procedures. At 0854 PST, on November 25, 2019, it was discovered that the temporary sample cart had a broken belt. At that time neither the Turbine Building Process Radiation Monitoring Sample Rack nor the temporary sample cart could be returned to service. At 1300 PST, on November 25, 2019, the temporary sample cart was returned to service following repairs. This restored the required compensatory measures for TEA-SR-26. This event is being reported as a major loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii). There was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

• * * UPDATE ON 11/27/2019 AT 0655 EST FROM SEAN KEEHN TO BRIAN LIN * * *

At 2057 PST, on November 26, 2019, it was discovered that the temporary sample cart had lost power and was not in service. At this time, neither TEA-SR-26 nor the temporary sample cart were in service, this was a subsequent failure of the temporary sample cart, and at the time the station had been unsuccessful at restoring a reliable alternate sampling method following the failure that occurred at 0854 PST, on November 25, 2019. At 2350 PST, on November 26, 2019, the temporary sample cart was returned to service following repairs. This restored the required compensatory measures for TEA-SR-26. The NRC Resident Inspector will be notified. Notified the R4DO (Pick) via email.