05000482/FIN-2006003-06

Finding

Title

Reactor Coolant System (RCS) Pressure Boundary Leakage Due to Small Cracks in Steam Generator Lower Head Bowl Drain Lines

Description

A self-revealing, Green, violation of TS 3.4.13, RCS Operational Leakage, was identified for RCS pressure boundary leakage occurring while in Modes 1, 2, 3, or 4. This issue was determined not to be a finding because a performance deficiency was not identified. Enforcement discretion was exercised for this violation. During Refueling Outage 14, the licensee conducted bare metal visual inspections of their steam generator bowl drain boss welds and heat affected zones. The inspections were conducted as part of their Alloy 600 program and in response to Information Notice 2005-002. Based on the presence of boron deposits, the licensee determined that RCS pressure boundary leakage due to primary water stress corrosion cracking in the Alloy-600 region of the bowl drain weld area on Steam Generators C and D had occurred during the previous operating cycle.

06
Site:	Wolf Creek
Report	IR 05000482/2006003 Section 4OA3
Date counted	Jun 30, 2006 (2006Q2)
Type:	Violation: Severity level Enforcement Discretion
cornerstone	Mitigating Systems
Identified by:	Self-revealing
Inspection Procedure:	IP 71153
Inspectors (proximate)	T Rhoades B Baca G Werner S Cochrum J Mateychick
INPO aspect
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v • d • e

Finding - Wolf Creek - IR 05000482/2006003

1(0)2(0)3(1)4(0)5(0)6(0)7(0)10(0)11(0)201(0)301(0)401(0)

IR 05000482/2006003: 6

Finding List (Wolf Creek) @ 2006Q2

CCA Matrix: 2006Q2

	Q	CCA	Title
05000482/FIN-2005008-03	2005Q4		Failure to Ensure Redundant Safe Shutdown Systems Located in the Same Fire Area Are Free of Fire Damage
05000482/FIN-2006003-06	2006Q2		Reactor Coolant System (RCS) Pressure Boundary Leakage Due to Small Cracks in Steam Generator Lower Head Bowl Drain Lines

Self-Identified List (Wolf Creek)

[Wolf Creek Findings full list]

05000482/FIN-2006003-06

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