05000482/FIN-2018010-04

Finding

Title

Failure to Identify 125 VDC Equalizing Voltage Exceeded Design Requirements

Description

The team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to verify or check the adequacy of design calculation NK-E-001, 125 Volt Direct-Current (VDC) Class 1E Battery System Sizing, Voltage Drop and Short Circuit Studies, Revision 4. The licensee failed to recognize that the actual 125 VDC Class 1E bus voltages had exceeded the maximum design limit voltages for downstream equipment identified in the calculation, and they had not placed any limits on voltages which could exceed the design limit of 140 VDC on the Class 1E System components.

04
Site:	Wolf Creek
Report	IR 05000482/2018010 Section 1R21
Date counted	Sep 30, 2018 (2018Q3)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.21M
Inspectors (proximate)	R Kopriva F Thomas I Anchondo A Palmer H Leake J Zudans T Farnholtz
Violation of:	10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion III, Design Control
CCA	H.13, Consistent Process
INPO aspect	DM.1
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v • d • e

Finding - Wolf Creek - IR 05000482/2018010

1(1)2(3)3(2)4(0)5(0)6(0)7(2)8(0)10(5)11(0)201(4)403(0)404(0)440(0)

IR 05000482/2018010: 1 2 3 4 5

Finding List (Wolf Creek) @ 2018Q3

CCA Matrix: 2018Q3

	Q	CCA	Title
05000482/FIN-2017008-02	2017Q4	H.9	Failure to Provide Adequate Emergency Lighting
05000482/FIN-2017008-01	2017Q4		InadequateEvaluation of Spurious Valve Operation
05000482/FIN-2018001-01	2018Q1		Inadequate Functionality Assessment Associated with the Emergency Excess Letdown Flowpath
05000482/FIN-2018007-02	2018Q2		Minor Violation
05000482/FIN-2018007-01	2018Q2	P.2	Failure to Provide Adequate Work Instructions for Preventive Maintenance on Safety-Related Equipment
05000482/FIN-2018002-03	2018Q2	H.2	Failure to Adequately Implement Instrumentation and Controls Surveillance Procedures
05000482/FIN-2018002-02	2018Q2	H.3	Failure to Maintain Adequate Pressurization of the Control Room Envelope
05000482/FIN-2018002-01	2018Q2		Announcement of an NRC Inspectors Presence by Station Personnel
05000482/FIN-2018003-01	2018Q3	H.14	Failure to Correct Degraded Performance of a Safety-Related Tornado Damper
05000482/FIN-2018003-02	2018Q3		Failure to Submit a Licensee Event Report for a Condition Prohibited by Technical Specifications
05000482/FIN-2018010-01	2018Q3		Failure to Follow Procedures
05000482/FIN-2018010-02	2018Q3		Failure to Establish an Adequate Procedure for Operator Time Critical Actions Validation
05000482/FIN-2018010-03	2018Q3	P.4	Failure to Correct Reoccurring Problems with Time Critical/Sensitive Action Activities
05000482/FIN-2018010-04	2018Q3	H.13	Failure to Identify 125 VDC Equalizing Voltage Exceeded Design Requirements
05000482/FIN-2018201-01	2018Q3		Security
05000482/FIN-2018201-02	2018Q3		Security
05000482/FIN-2018201-03	2018Q3		Security
05000482/FIN-2018201-04	2018Q3		Security

Self-Identified List (Wolf Creek)

	Q	Title
05000482/FIN-2018010-05	2018Q3	Licensee-Identified Violation

[Wolf Creek Findings full list]

05000482/FIN-2018010-04

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