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Event Notification Report for June 13, 2018

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
6/12/2018 - 6/13/2018

** EVENT NUMBERS **


53456

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Power Reactor Event Number: 53456
Facility: ARKANSAS NUCLEAR
Region: 4     State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: KEVIN PARKS
HQ OPS Officer: BETHANY CECERE
Notification Date: 06/12/2018
Notification Time: 22:11 [ET]
Event Date: 06/12/2018
Event Time: 00:00 [CDT]
Last Update Date: 06/12/2018
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
Person (Organization):
NICK TAYLOR (R4DO)
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Hot Standby 0 Hot Standby

Event Text

PRESSURE BOUNDARY LEAKAGE IDENTIFIED WHILE SHUTDOWN

"On June 12, 2018, at 1500 CDT, a Reactor Coolant System (RCS) Pressure Boundary leak was identified during a Mode 3, hot shutdown walkdown on a High Pressure Injection Line [HPI] to Reactor Coolant Pump (P32C) drain line weld near MU-1066A HPI Line Drain Valve and MU-1066B HPI Line Drain Valve. The 3/4 inch drain line containing drain valves MU-1066A and MU-1066B on the 'C' HPI header (CCA-5 pipe class) has a through-wall defect on the pipe stub or welds between the sockolet and valve MU-1066A. The leak location is in the ASME Class I RCS Pressure Boundary.

"The hot shutdown walkdown was being performed as part of a planned outage to investigate excessive Reactor Building Sump inleakage. Total unidentified RCS leakage prior to the investigation was determined to be at 0.165 gpm. After the initial investigation of the leakage, the following Tech Specs [TS] were determined be applicable: TS 3.4.5 - RCS Loops Mode 3, TS 3.4.13 - RCS Leakage, TS 3.5.2 - ECCS. Unit 1 is currently in Mode 3 and in progress of an RCS cooldown to comply with Tech Spec requirements."

The licensee notified the NRC Resident Inspector.


Page Last Reviewed/Updated Monday, June 18, 2018
Monday, June 18, 2018