ENS 51505

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v t e ENS Event
01:03 Sep 10, 2015
Title	Invalid Actuation of a General Containment Isolation Signal Affecting More than One System
Event Description	This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe invalid actuation containment isolation signals affecting containment isolation valves in more than one system. On September 9, 2015 at 2103 hours0.0243 days <br />0.584 hours <br />0.00348 weeks <br />8.001915e-4 months <br /> Eastern Daylight Time (EDT), Unit 1 experienced a loss of electrical power to motor control center 1CB when the substation E6 feeder breaker tripped. The loss of power resulted in closure of primary containment isolation valves (PCIVs) in Unit 1 Primary Containment Isolation System (PCIS) Group 2 (i.e. Drywell Equipment and Floor Drains, Residual Heat Removal (RHR) Discharge to Radwaste, RHR Process Sample, and Traversing lncore Probe), Group 3 (i.e., Reactor Water Cleanup), and Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems). It has been determined that affected PCIVs appropriately closed. However, the limit switch within the motor operator of the inboard RWCU PCIV (i.e. 1-G31-F001) malfunctioned; resulting in an inaccurate remote position indication. Testing has confirmed that 1-G31-F001 properly closed and can perform its intended safety function. These PCIV isolations were the result of a substation E6 feeder breaker trip to motor control center 1CB and not in response to actual plant conditions (i.e., to mitigate the consequences of an event) and, therefore, were invalid. This event did not result in any adverse impact to the health and safety of the public. The NRC Resident Inspector was notified.

ENS 51505 +/-
Where
Brunswick North Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1164.38 h48.516 days <br />6.931 weeks <br />1.595 months <br />)
Opened:	Mark Turkal 13:26 Oct 28, 2015
NRC Officer:	Jeff Herrera
Last Updated:	Oct 28, 2015
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v • d • e

v t e Emergency Notification System
Brunswick with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2024-01-02T04:33:00 [Table view]
[ENS list for Brunswick]

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