ENS 50198

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v t e ENS Event
18:44 Jun 12, 2014
Title	System Restoration Error Causes Both Trains of Control Structure Chilled Water System to Be Inoperable
Event Description	On 6/12/2014, [multiple Limiting Condition of Operations] LCOs were entered on SSES Units 1 and 2 for an inoperable Division 2 train of Control Structure Chilled Water starting at 1344 EDT for the planned performance of a flow surveillance. During restoration steps at 1444 EDT on 6/12/2014, a Division 1 Control Structure Chilled Water control switch was mistakenly manipulated which caused the redundant operable train to be declared inoperable. During this time both divisions of Control Structure Chillers were inoperable and were not available to perform the required safety function. This is a condition that, at the time of discovery, could have prevented fulfillment of a Safety Function and is reportable under [10 CFR] 50.72(b)(3)(v)(D) as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> notification. The loss of safety function is based on 1) the SSC is inoperable in a required mode of operation, 2) the inoperability is due to personnel error, and 3) there was no redundant equipment in the same system that was operable. The Division 1 train of Control Structure Chilled Water was restored to operable status at 1446 EDT on 6/12/2014. The licensee notified the NRC Resident Inspector.

ENS 50198 +/-
Where
Susquehanna Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-0.25 h-0.0104 days <br />-0.00149 weeks <br />-3.4245e-4 months <br />)
Opened:	Ron Fry 18:29 Jun 12, 2014
NRC Officer:	Jeff Rotton
Last Updated:	Jun 12, 2014
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v • d • e

v t e Emergency Notification System
Susquehanna with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-04-08T00:52:00 [Table view]
[ENS list for Susquehanna]

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