05000361/FIN-2009005-04

Finding

Title

Failure to Correct Problems with Emergency Diesel Generator Train A

Description

The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensee\'s failure to take adequate corrective actions for conditions adverse to quality associated with Unit 3 emergency diesel generator train A. Specifically, on June 13, 2009, following an emergency diesel generator failure on June 6, 2009, immediate corrective actions were inadequately implemented when improperly configured annunciator power supplies were installed in the emergency diesel generator train A annunciator system. This configuration problem contributed to rapid capacitor degradation as a result of the increased heat from a resistor, which ultimately caused the emergency diesel generator failure to start on December 12, 2009. This finding was entered into the licensees corrective action program as Nuclear Notification NN 200756001. The finding is greater than minor because the failure to correct conditions adverse to quality for the emergency diesel generators is associated with the equipment performance attribute of the Mitigating Systems Cornerstone and affects the associated cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using the Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheets, the inspectors determined that this finding represented an actual loss of safety function of emergency diesel generator train for greater than the technical specification allowed outage time. This required that a Phase 2 estimation be completed. Because the Phase 2 analysis concluded that the finding was potentially greater than green, a Phase 3 analysis was completed by a regional senior reactor analyst. The San Onofre SPAR model indicated that the delta core damage frequency for emergency diesel generator train A being non-functional was 2.0E-6/yr. For an exposure time of 7 days, this resulted in an incremental core damage frequency of 3.8E-8 for this finding, considering internal events only. The dominant sequence was a station blackout sequence with failure of the diesels, failure to cross-tie power from the other unit, failure to recover either onsite or offsite power, failure of batteries at 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, and a failure to manually control the turbine-driven auxiliary feedwater pump after battery depletion. The senior reactor analyst determined qualitatively that the contribution of external events would not significantly add to this result; therefore, the finding is determined to be of very low safety significance. This finding has a crosscutting aspect in the area of human performance associated with resources because the licensee failed to provide adequate instructions to perform activities affecting quality H.2(c) (Section 1R12)

04
Site:	San Onofre
Report	IR 05000361/2009005 Section 1R12
Date counted	Dec 31, 2009 (2009Q4)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.12
Inspectors (proximate)	L Ricketson G Guerra R Lantz P Elkmann J Adams J Reynoso G Warnick C Osterholtz A Fairbanks M Bloodgood R Schmitt
CCA	H.7, Documentation
INPO aspect	WP.3
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v • d • e

Finding - San Onofre - IR 05000361/2009005

6(0)2(7)3(9)4(5)5(13)7(2)8(0)9(2)301(0)302(0)401(0)402(2)403(0)26(0)

IR 05000361/2009005: 1 2 3 4 5 6 7 8 9 10 11 12 13

Finding List (San Onofre) @ 2009Q4

CCA Matrix: 2009Q4

	Q	CCA	Title
05000361/FIN-2009002-03	2009Q1	H.11 H.12	Failure to Properly Inspect Scaffolding in Safety-Related Areas
05000361/FIN-2009002-02	2009Q1	H.14	Failure to Properly Implement the Operability Determination Process
05000361/FIN-2009002-01	2009Q1	H.8	Failure to Follow Procedures when Performing Maintenance on the Auxiliary Feedwater System
05000361/FIN-2009002-04	2009Q1	H.5	Inadequate Procedure for Reactivity Manipulations
05000361/FIN-2009002-05	2009Q1	H.14	Failure to Properly Evaluate Boric Acid Leakage from the Reactor Coolant Pump Vapor Seal
05000361/FIN-2009002-06	2009Q1	H.4 H.5	Failure to Follow Procedures to Reassemble a Reactor Coolant System Pressure Retaining Component
05000361/FIN-2009002-07	2009Q1	H.11 H.12	Failure to Follow Procedure for Aligning a Reactor Coolant System Ion Exchanger
05000361/FIN-2009003-08	2009Q2		Failure to Establish Adequate Scaffolding Erection Procedures
05000361/FIN-2009003-09	2009Q2	P.2	Failure to Maintain Written Procedures Covered in Regulatory Guide 1.33
05000361/FIN-2009003-04	2009Q2	H.7	Failure to Assess and Manage Risk for Electrical Switchyard Impacting Maintenance
05000361/FIN-2009003-07	2009Q2	H.2	Failure to Follow Procedures for Safety-Related Painting Activities
05000361/FIN-2009003-06	2009Q2	H.8	Improper Controls for Electrical Test Equipement
05000361/FIN-2009003-03	2009Q2	P.3	Risk Assessment Performed Using Risk Assessment Tools with Known Errors
05000361/FIN-2009003-02	2009Q2	H.14	Failure to Implement Corrective Actions to Prevent Repeat Safety-related 480V Breaker Failures
05000361/FIN-2009003-05	2009Q2	P.2	Failure to Perform Operability Determination in a Timely Manner on Safety-related Equipment
05000361/FIN-2009003-01	2009Q2	H.11 H.12	Failure to Evaluate the Impact of Temporary Scaffolding on Installed Fire Protection Systems
05000361/FIN-2009004-05	2009Q3		Failure to Specify Appropriate Requirements in Procurement Documents
05000361/FIN-2009404-01	2009Q3	H.7	Security
05000361/FIN-2009004-03	2009Q3	P.1 P.1(a)	Failure to Follow Corrective Action process for an Inadequate Postmaintenance Test
05000361/FIN-2009004-02	2009Q3	P.3	Failure to Assess and Manage Risk for Maintenance that Could Impact Offsite Power Components
05000361/FIN-2009004-01	2009Q3	P.3	Failure to Submit Complete Revisions to Updated Final Safety Analysis Report for Penetration Seal Changes
05000361/FIN-2009004-04	2009Q3	P.1 P.1(a)	Failure to Notify the NRC within Required Timeframe
05000361/FIN-2009005-09	2009Q4	H.2	Failure to Implement Fire Protection Plan Requirements Related to Hot Work Activities
05000361/FIN-2009005-07	2009Q4	H.4 H.5	Inadequate Circulating Water System Maintenance Procedures Contribute to Unit 2 Inadvertent Reactor Trip
05000361/FIN-2009005-08	2009Q4	H.7	Unit 2 Heat Treat Pre-Job Brief Not Performed in Accordance with Procedural Requirements
05000361/FIN-2009005-10	2009Q4	H.7	Inadequate Design Control for Safety-Related Electrical Connections
05000361/FIN-2009005-06	2009Q4	H.13	Failure to Adequately Implement Compensatory Measures to Maintain Equipment Operable
05000361/FIN-2009005-05	2009Q4	P.2	Failure to Follow the Operability Determination Process
05000361/FIN-2009005-04	2009Q4	H.7	Failure to Correct Problems with Emergency Diesel Generator Train A
05000361/FIN-2009005-03	2009Q4	P.2	Failure to Correct Problems with Emergency Diesel Generator Train B
05000361/FIN-2009005-02	2009Q4	H.14	Failure to Adequately Identify Problems in Correction Action Program
05000361/FIN-2009005-01	2009Q4	P.1 P.1(a)	Failure to Initiate a Notification in a Timely Manner
05000361/FIN-2009402-02	2009Q4	H.12	Security
05000361/FIN-2009402-01	2009Q4	P.1	Security
05000361/FIN-2009007-02	2009Q4	H.2	Incorrect Mixing and Batching Associated with Concrete
05000361/FIN-2009007-01	2009Q4	H.2	Failure to Adequately Store and Preserve Materials for Used in Safety-Related Concrete

Self-Identified List (San Onofre)

	Q	Title
05000361/FIN-2009005-11	2009Q4	Licensee-Identified Violation
05000361/FIN-2009005-12	2009Q4	Licensee-Identified Violation
05000361/FIN-2009005-13	2009Q4	Licensee-Identified Violation

[San Onofre Findings full list]

05000361/FIN-2009005-04

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