17:53 Feb 19, 2019
Secondary Containment Inoperable
On February 19, 2019, at 1307 EST, with the reactor at 100 percent Core Thermal Power and steady state conditions, plant personnel notified the Main Control Room that both doors in the Secondary Containment Airlock on the Reactor Building Fifth Floor were opened simultaneously for a period of approximately five minutes (i.e., from 1253 to 1258 EST). The failure of this interlock, which is intended to prevent both doors from being opened simultaneously, resulted in the Technical Specification (TS) Surveillance Requirement (SR) 220.127.116.11.3 not being met. The maximum Secondary Containment pressure observed during that time remained within TS limits. There were no radiological releases associated with this event.
Declaring Secondary Containment inoperable as a result of not meeting TS SR 18.104.22.168.3 is reportable under 10 CFR 50.72(b)(3)(v)(C) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material.
The licensee has notified the NRC Resident Inspector.The repair to the failed interlock is in progress. As a compensatory measure signs are posted on the doors to notify personnel to not access the Reactor Building via those doors.
Michigan (NRC Region 3)
|10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material|
|LER:||look for an ler...|
|Time - Person (Reporting Time:+-2.57 h|
15:19 Feb 19, 2019
|NRC Officer:||Joanna Bridge|
|Last Updated:||Feb 19, 2019|
|53883 - NRC Website|