05000423/FIN-2018010-05

Finding

Title

Inadequate Test Control of ECCS Valve Interlocks

Description

The team identified a finding of very low safety significance (Green) involving an NCV of 10 CFR Part 50, Appendix B, Criterion XI, Test Control. Specifically, Dominion did not ensure that all testing required to demonstrate that emergency core cooling system (ECCS) valve interlock circuits would perform satisfactorily was being performed. The team determined that certain interlocks associated with ECCS valve 3SIL*MV8804A control circuit were not properly tested to demonstrate that the valve would not open if interlocks had not been met or would open, when required, with minimum interlock requirements met during design basis accidents.

05
Site:	Millstone
Report	IR 05000423/2018010 Section 1R21
Date counted	Jun 30, 2018 (2018Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.21M
Inspectors (proximate)	K Mangan M Patel J Brand J Rady C Lally C Baron J Nicely M Gray
Violation of:	10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion XI
INPO aspect
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v • d • e

Finding - Millstone - IR 05000423/2018010

1(0)1(0)2(0)3(1)4(0)5(0)6(0)10(5)11(1)301(0)403(1)410(1)501(0)

IR 05000423/2018010: 1 3 4 2 5

Finding List (Millstone) @ 2018Q2

CCA Matrix: 2018Q2

	Q	CCA	Title
05000336/FIN-2017007-01	2017Q3		Failure to Replace Auxiliary Feedwater Solenoid Valves within the Required Frequency
05000336/FIN-2017003-01	2017Q3	H.12	Inadequate Procedure Results in Inadvertent Lowering of Spent Fuel Pool Level
05000423/FIN-2017004-01	2017Q4	H.5	Failure to Maintain RCS Pressure during Solid Plant Cooldown
05000336/FIN-2018010-03	2018Q2	P.5	Failure to Correct Part 21 Power Supply Defects
05000336/FIN-2018010-01	2018Q2	P.2	Over-Duty Breakers on Safety-Related Buses on Unit 2
05000423/FIN-2018010-02	2018Q2	P.1	Over-Duty Breakers on Safety-Related Bus 34C on Unit 3
05000336/FIN-2018010-04	2018Q2	P.3	Flood Seals Not Installed in Unit 2 A EDG and Auxiliary Building Penetrations
05000423/FIN-2018010-05	2018Q2		Inadequate Test Control of ECCS Valve Interlocks
05000336/FIN-2018410-01	2018Q2	H.1	Security

Self-Identified List (Millstone)

[Millstone Findings full list]

05000423/FIN-2018010-05

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