05000443/FIN-2009007-01: Difference between revisions

Finding

Title

Inadequate B EDG Design Change

Description

A self-revealing apparent violation of 10 CFR 50, Appendix B, Criterion III, Design Control was identified following a review of the identified causes for the failure of the B EDG jacket water cooling system on February 25, 2009. Specifically, NextEras failure to adequately control design changes implemented on the B EDG jacket water cooling system in January 2009 led to the failure of the gasket on flange JTR005 in the B EDG jacket water cooling system on February 25. The inspectors determined that this finding is more than minor because it is associated with the design control attribute of the Mitigating Systems Cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, design modification 08MSE11, intended to address flange JTR005 alignment and change the flange gasket design was inadequate and resulted in inoperability of the B EDG. In accordance with IMC 0609, Significance Determination Process, a Phase 3 risk analysis was performed and determined that the calculated delta CDF for the finding was 2.27E-6, which represents a low to moderate safety significance or White finding. The cause of the finding is related to the corrective action component of the cross-cutting area of problem identification and resolution because NextEra did not thoroughly evaluate problems in a timely manner such that resolutions address causes (P.1(c)). Specifically, NextEra did not adequately evaluate deficient conditions when addressing B EDG cooling water flange leaks, failed to adequately use readily available internal operating experience, and failed to adequately evaluate and correct the impact of engine vibrations on flange JTR005 integrity, contributing to a subsequent failure of the flange. (1R18

01
Site:	Seabrook
Report	IR 05000443/2009007 Section 1R18
Date counted	Sep 30, 2009 (2009Q3)
Type:	Violation: White
cornerstone	Mitigating Systems
Identified by:	Self-revealing
Inspection Procedure:	IP 71111.18
Inspectors (proximate)	C Cahill D Lew E Burket J Heinly J Rady K Mangan R Moore W Raymonda Burritta Ziedonis D Schroeder S Ibarrolaa Burritta Defrancisco C Cahill D Holody D Roberts G Bowman J Clifford K Farrar S Collins W Raymond
CCA	P.2, Evaluation
INPO aspect	PI.2
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v • d • e

Finding - Seabrook - IR 05000443/2009007

1(0)2(0)3(0)4(2)5(1)6(0)7(2)301(0)302(0)402(0)403(0)501(0)

IR 05000443/2009007: 1 2

Finding List (Seabrook) @ 2009Q3

CCA Matrix: 2009Q3

	Q	CCA	Title
05000443/FIN-2009007-01	2009Q3	P.2	Inadequate B EDG Design Change
05000443/FIN-2009004-01	2009Q3		Failure to verify that ultimate heat sink isolation valves do not leak in excess of design basis assumptions.

Self-Identified List (Seabrook)

	Q	Title
05000443/FIN-2008005-01	2008Q4	Licensee-Identified Violation
05000443/FIN-2009007-02	2009Q3	Licensee-Identified Violation
05000443/FIN-2009004-02	2009Q3	Licensee-Identified Violation

[Seabrook Findings full list]

@@ Line 1: / Line 1: @@
 {{finding
 | title = Inadequate B EDG Design Change
 | docket = 05000443
 | inspection report = IR 05000443/2009007

05000443/FIN-2009007-01: Difference between revisions

Latest revision as of 23:09, 29 May 2018

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05000443/FIN-2009007-01: Difference between revisions

Latest revision as of 23:09, 29 May 2018

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