ENS 53456

v t e ENS Event
13:44 Apr 25, 2024
Title	Pressure Boundary Leakage Identified While Shutdown
Event Description	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.

ENS 53456 +/-
Where
Arkansas Nuclear Arkansas (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor
Time - Person (Reporting Time:+-51447.56 h-2,143.648 days <br />-306.235 weeks <br />-70.473 months <br />)
Opened:	Kevin Parks 22:11 Jun 12, 2018
NRC Officer:	Bethany Cecere
Last Updated:	Jun 12, 2018
53456 - NRC Website
v • d • e

v t e Emergency Notification System
Arkansas Nuclear with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2023-07-15T10:39:00 [Table view]
[ENS list for Arkansas Nuclear]

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