05000315/FIN-2018001-02

Finding

Title

Operation of Letdown System Leads to Voiding and Subsequent Relief Valve Lift

Description

The inspectors identified a finding of very low safety significanceand associated Non-Cited Violation of Technical Specification 5.4, Procedures, when the licensee failed to maintain a procedure for operating the letdown system. As a result, a water-hammer occurred which caused a safety-related relief valve to lift, which discharged reactor coolant to the Pressurizer Relief Tank until letdown was isolated

02
Site:	Cook
Report	IR 05000315/2018001 Section 1R20
Date counted	Mar 31, 2018 (2018Q1)
Type:	NCV: Green
cornerstone	Initiating Events
Identified by:	NRC identified
Inspection Procedure:	IP 71111.2
Inspectors (proximate)	J Ellegood T Taylor R Baker M Holmberg T Go G Roach L Smith K Riemer
Violation of:	Technical Specification - Procedures
INPO aspect
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v • d • e

Finding - Cook - IR 05000315/2018001

1(2)2(6)3(2)4(0)5(0)6(0)10(1)301(0)410(0)411(0)

IR 05000315/2018001: 1 2

Finding List (Cook) @ 2018Q1

CCA Matrix: 2018Q1

	Q	CCA	Title
05000315/FIN-2017007-01	2017Q3	P.3	Failure to Correct Operable, but Non - Conforming Conditions
05000315/FIN-2017004-01	2017Q4		Failure to Correct Numerous Anchor Darling Double Disc Gate Valve Non-Conformances
05000315/FIN-2017004-02	2017Q4		Unit 1 Letdown System Safety Valve Lift During Preparations for Cooldown
05000315/FIN-2017004-03	2017Q4	H.1	Failure to Promptly Correct The CAQ by Not Testing the CCW Leak Isolation Valves
05000315/FIN-2017004-04	2017Q4	H.14	Failure to Verify the Adequacy of the Design for a Temporary Modification
05000315/FIN-2018001-01	2018Q1		Failure of Unit 1 Turbine Driven Auxiliary Feedwater Pump to Reach Rated Speed
05000315/FIN-2018001-02	2018Q1		Operation of Letdown System Leads to Voiding and Subsequent Relief Valve Lift

Self-Identified List (Cook)

	Q	Title
05000315/FIN-2017004-05	2017Q4	Licensee-Identified Violation

[Cook Findings full list]

05000315/FIN-2018001-02

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