ENS 51270

v t e ENS Event
18:30 Jul 22, 2015
Title	Degraded Condition Due to Reactor Coolant System Leak
Event Description	On July 8, 2015, Fort Calhoun Station was in Mode 1, 100% when personnel identified an increase in the Reactor Coolant System unidentified leakage rate. As a result, personnel performed a containment entry and identified the source coming from the Reactor Coolant Pump 3A seal area. Based on this observation, a monitoring plan was established and on July 20, 2015 the leak rate exceeded the pre-establish leak limit and operators manually shutdown the reactor. On July 22, 2015, at approximately 1330 CDT, personnel identified the source of the seal leak as a crack on the middle seal inlet line, which is part of the reactor coolant system boundary. Maintenance personnel have since repaired the seal line and it has passed post-maintenance testing. The 8-hour verbal report is being made post event due to additional review of the leakage condition identifying the leakage constituted a degraded condition due to be material defects in the primary coolant system. The leak rate was between 1 and 2 gpm. The licensee notified the NRC Resident Inspector.

ENS 51270 +/-
Where
Fort Calhoun Nebraska (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+119.52 h4.98 days <br />0.711 weeks <br />0.164 months <br />)
Opened:	Julie Bissen 18:01 Jul 27, 2015
NRC Officer:	John Shoemaker
Last Updated:	Jul 27, 2015
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v • d • e

v t e Emergency Notification System
Fort Calhoun with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2015-07-22T18:30:00 [Table view]
[ENS list for Fort Calhoun]

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