05000457/FIN-2018002-01

Finding

Title

Inadequate Detail in Maintenance Work Instructions Resulted in Failed Gearbox Oil Cooler Head Gasket and Inoperable 2B Auxiliary Feedwater Pump

Description

A self-revealed finding of very low safety significance (i.e., Green) and an associated Non-Cited Violation (NCV) of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified for the licensees failure to have adequate detail within their maintenance work instructions to enable proper reassembly of the 2B auxiliary feedwater (AF)pump gearbox oil cooler. Specifically, during the licensees 19th Unit 2 refueling outage in April 2017, the gearbox oil cooler closure head was reassembled following scheduled maintenance using an excessive amount of room temperature vulcanizing silicone (RTV) on the joint and an insufficient amount of torque on the closure head bolting. As a result, on March 16, 2018, the closure head joint failed causing several hours of unplanned inoperability and unavailability for the 2B AFPump.

01
Site:	Braidwood
Report	IR 05000457/2018002 Section 1R12
Date counted	Jun 30, 2018 (2018Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	Self-revealing
Inspection Procedure:	IP 71111.12
Inspectors (proximate)	D Kimble D Betancourt E Fernandez T Go C Hunt D Sargis S Sheldon M Porfirio L Torres E Duncan
Violation of:	10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion V
CCA	H.9, Training
INPO aspect	CL.4
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Finding - Braidwood - IR 05000457/2018002

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 05000457/2018002: 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]

05000457/FIN-2018002-01

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