05000336/FIN-2018010-04

Finding

Title

Flood Seals Not Installed in Unit 2 A EDG and Auxiliary Building Penetrations

Description

The team identified a finding of very low safety significance (Green) and associated NCV of 10 CFR Part 50, Appendix B, Criterion XIV, Corrective Actions. Dominion identified a condition adverse to quality but did not correct the condition. Specifically, Dominion performed evaluations and walk downs in 2012 and 2016 to validate that all necessary flood seals for design basis and beyond design basis flood events had been properly installed. Dominion determined that they could not verify 50 wall penetrations had seals installed and entered the deficiency into the corrective action program. The team noted that an electrical conduit that passed through a Unit 2 A emergency diesel generator (EDG) building exterior wall, located below the design basis flood height, was one of the penetrations in question. During the inspection, following NRC questions, Dominion removed the electrical conduit cover plate and confirmed that a seal was not installed.

04
Site:	Millstone
Report	IR 05000336/2018010 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 XIV, Inspection, Test, and Operating Status
CCA	P.3, Resolution
INPO aspect	PI.3
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v • d • e

Finding - Millstone - IR 05000336/2018010

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 05000336/2018010: 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]

05000336/FIN-2018010-04

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