05000456/FIN-2018002-03

Finding

Title

Inadequate Test Activity Coordination Results in Unintended Valve Actuation and Reactor Coolant System Pressure Drop

Description

A self-revealed finding of very low safety significance (i.e., Green) and an associated NCV of Technical Specification 5.4, Procedures, was identified for the licensees failure to have properly coordinated testing activities associated with redundant Unit 1 pressurizer pressure instruments in accordance with the stations procedural requirements governing such testing. Specifically, during the licensees 20th Unit 1 refueling outage, on April 23, 2018, redundant pressurizer pressure instrumentation channels were inadvertently subjected to simultaneous testing activities. This resulted in the coincidence logic for both of the units pressurizer power-operated relief valves (PORVs) being satisfied and the PORVs opening to depressurize the RCS from approximately 345 pounds per square inch gauge (psig) to approximately 320 psig

03
Site:	Braidwood
Report	IR 05000456/2018002 Section 1R19
Date counted	Jun 30, 2018 (2018Q2)
Type:	NCV: Green
cornerstone	Initiating Events
Identified by:	Self-revealing
Inspection Procedure:	IP 71111.19
Inspectors (proximate)	D Kimble D Betancourt E Fernandez T Go C Hunt D Sargis S Sheldon M Porfirio L Torres E Duncan
Violation of:	Technical Specification
CCA	H.4, Teamwork
INPO aspect	PA.3
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v • d • e

Finding - Braidwood - IR 05000456/2018002

1(0)2(3)3(2)4(0)5(0)6(0)10(0)11(0)12(0)13(0)301(0)410(0)411(1)412(0)503(0)

IR 05000456/2018002: 2 3 1

Finding List (Braidwood) @ 2018Q2

CCA Matrix: 2018Q2

	Q	CCA	Title
05000456/FIN-2017003-01	2017Q3	H.11	Failure to Implement Adequate Radiological Controls for Treated Liquid Radioactive Effluents Containing Tritium
05000456/FIN-2017008-01	2017Q4		Failure to Prevent Secondary Missiles Following a Postulated HELB
05000456/FIN-2017008-02	2017Q4		Inadequate Blow Out Panel Design Control
05000456/FIN-2017008-03	2017Q4		Failure to Properly Correct Errors in Design Analysis for Main Steam Line Break in Main Steam Tunnel
05000456/FIN-2017008-04	2017Q4		Untimely Corrective Action for Secondary Missiles
05000456/FIN-2017008-05	2017Q4		Inaccurate Analysis of Record
05000457/FIN-2018002-01	2018Q2	H.9	Inadequate Detail in Maintenance Work Instructions Resulted in Failed Gearbox Oil Cooler Head Gasket and Inoperable 2B Auxiliary Feedwater Pump
05000456/FIN-2018002-02	2018Q2	H.3	Work Instruction Error Results in Reactor Coolant System Pressure Transient
05000456/FIN-2018002-03	2018Q2	H.4	Inadequate Test Activity Coordination Results in Unintended Valve Actuation and Reactor Coolant System Pressure Drop

Self-Identified List (Braidwood)

[Braidwood Findings full list]

05000456/FIN-2018002-03

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