05000423/FIN-2017004-01

Finding

Title

Failure to Maintain RCS Pressure during Solid Plant Cooldown

Description

A self-revealed NCV of very low safety significance (Green) of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified wherein, on October 13, 2017, Dominion failed to accomplish an activity affecting quality, Plant Cooldown, in accordance with approved procedures. Specifically, during solid plant cooldown, over the course of 18 seconds, reactor coolant system (RCS) pressure increased from 350 psia to 472 psia, which exceeded the limit of 435 psia established by Attachment 1, RCS Cooldown Curves, of operating procedure OP 3208, Plant Cooldown, Revision 028. Dominion operations staff took prompt actions to restore RCS pressure within limits and completed a required engineering evaluation to determine the effect of the out of limit condition on the structural integrity of the RCS. Dominion entered this issue into the corrective action program (CAP) as condition report (CR) 1080842 and completed a root cause evaluation of the event. This finding was determined to be more than minor because it adversely affected the configuration control attribute of the Barrier Integrity cornerstone objective to provide reasonable assurance that physical design barriers (RCS) protect the public from radionuclide releases caused by accidents or events. The inspectors evaluated the finding using IMC 0609, Appendix G, Attachment 1, Shutdown Operations Significance Determination Process Phase 1 Initial Screening and Characterization of Findings, and determined the finding to be of very low safety significance (Green). The finding had a cross-cutting aspect in the area of Human Performance related to Work Management because the licensee did not implement an adequate process of planning, controlling, and executing work activities such that nuclear safety was the overriding priority. Specifically, Dominion failed to recognize the increased risk of isolating instrument air during solid plant operations. [H.5]

01
Site:	Millstone
Report	IR 05000423/2017004 Section 1R20
Date counted	Dec 31, 2017 (2017Q4)
Type:	NCV: Green
cornerstone	Barrier Integrity
Identified by:	Self-revealing
Inspection Procedure:	IP 71111.2
Inspectors (proximate)	J Fuller L Mckown C Highley H Anagnostopoulos E Burket J Deboer P Presby J Brand D Schaefer
Violation of:	10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion V
CCA	H.5, Work Management
INPO aspect	WP.1
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v • d • e

Finding - Millstone - IR 05000423/2017004

1(0)2(0)7(0)8(0)403(0)404(0)1(3)2(1)3(1)4(1)5(0)6(0)7(1)302(0)403(5)404(0)301(0)

IR 05000423/2017004: 1

Finding List (Millstone) @ 2017Q4

CCA Matrix: 2017Q4

	Q	CCA	Title
05000336/FIN-2017403-01	2017Q1		Security
05000336/FIN-2017403-02	2017Q1		Security
05000336/FIN-2017403-03	2017Q1	H.11	Security
05000336/FIN-2017403-04	2017Q1	H.8	Security
05000336/FIN-2017403-05	2017Q1	H.12	Security
05000336/FIN-2017001-01	2017Q1	P.3	Failure to Maintain CST Temperature in Accordance with Procedural Requirements
05000423/FIN-2017001-02	2017Q1	H.3	Change of C Charging Pump Testing Requirements Contrary to ASME OM
05000336/FIN-2017405-01	2017Q2		Security
05000336/FIN-2017002-01	2017Q2		Potential Untimely Corrective Action for Anchor Darling Double Disc Gate Valves
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

Self-Identified List (Millstone)

	Q	Title
05000336/FIN-2017001-03	2017Q1	Licensee-Identified Violation

[Millstone Findings full list]

05000423/FIN-2017004-01

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