05000317/FIN-2007004-04

Finding

Title

Unit 2 Pressurizer Safety Valve LOW Lift Setting

Description

On November 16, 2006, Unit 2 automatically tripped due to high pressurizer pressure during the performance of a clearance order to support scheduled maintenance. As a result of the trip, one of two pressurizer code safety valve simmered (approximately three minutes) based on acoustic monitoring indications. Constellation sent the code safety valve to Wyle labs for analysis. The as-found setpoint was 2414 psia versus a required TS value of 2475 psia. Constellation determined that the low set point was due to degraded threads on the bonnet and compression screw. The inspectors identified concerns with the ACE. Constellation wrote condition report IRE-025-193 and plan on revising the ACE. This is issue is unresolved pending the inspectors review of the revised ACE to determine if there is a performance deficiency associated with the setting of the pressurizer safety valves

04
Site:	Calvert Cliffs
Report	IR 05000317/2007004 Section 4OA2
Date counted	Sep 30, 2007 (2007Q3)
Type:	URI:
cornerstone	Initiating Events
Identified by:	NRC identified
Inspection Procedure:	IP 71152
Inspectors (proximate)	S Kennedy M Klump R Rolph D Schroeder M Davis M Patel J Kraftya Dimitriadisg Dentel G Johnson M Davis P Frechette P Presby R Rolph S Kennedy
INPO aspect
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v • d • e

Finding - Calvert Cliffs - IR 05000317/2007004

1(0)2(0)3(1)4(1)5(1)6(0)7(0)8(0)9(0)201(0)402(0)403(0)404(0)502(0)17(0)

IR 05000317/2007004: 4

Finding List (Calvert Cliffs) @ 2007Q3

CCA Matrix: 2007Q3

	Q	CCA	Title
05000317/FIN-2007003-06	2007Q2		Degraded fire barrier between two fire areas
05000317/FIN-2007004-04	2007Q3		Unit 2 Pressurizer Safety Valve LOW Lift Setting

Self-Identified List (Calvert Cliffs)

[Calvert Cliffs Findings full list]

05000317/FIN-2007004-04

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