05000458/FIN-2016002-02

Finding

Title

Failure to Conduct Common Cause Failure Evaluation in Response to Inoperable Emergency Diesel Generator

Description

The inspectors identified a non-cited violation of Technical Specification 3.8.1, AC Sources Operating, for the licensees failure to take required actions for an inoperable emergency diesel generator. Specifically, after classifying the Division I emergency diesel generator as inoperable on the basis of a nonconforming condition discovered during an extended maintenance outage, and after failing to either verify that the Division II emergency diesel generator was not inoperable due to common cause failure within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or conduct a surveillance run on the Division II emergency diesel generator within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , the licensee failed to enter Mode 3 within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , as required by Actions C.3.1, C.3.2, and G.1 of Technical Specification 3.8.1, respectively. The licensee entered this issue into their corrective action program as Condition Report CR-RBS-2016-03978. Corrective actions included the scheduling of training to ensure that operations personnel fully understand the technical specification requirements for common cause evaluation as they relate to adverse conditions on emergency diesel generators. The failure to take required actions for an inoperable emergency diesel generator was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the equipment reliability attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to follow technical specification requirements to ensure the availability, reliability, and capability of the operable emergency diesel generator directly affected the cornerstone objective. Using NRC Inspection Manual Chapter 0609, Significance Determination Process, Appendix A, Exhibit 2 -- Mitigating Systems Screening Questions, the inspectors determined the finding to be of very low safety significance (Green) because the finding did not represent an actual loss of function of the Division II emergency diesel generator. The finding had a cross-cutting aspect in the area of human performance, consistent process, because the licensee failed to use a consistent, systematic approach to make decisions. Specifically, the licensee failed to review the required actions of the applicable technical specification so as to ensure that all of those actions would be properly carried out [H.13].

02
Site:	River Bend
Report	IR 05000458/2016002 Section 4OA2
Date counted	Jun 30, 2016 (2016Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71152
Inspectors (proximate)	B Parks F Ramirez G Warnick J Sowa L Brookhart M Phalen P Hernandez
Violation of:	Technical Specification
CCA	H.13, Consistent Process
INPO aspect	DM.1
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Finding - River Bend - IR 05000458/2016002

1(0)2(3)3(0)4(0)5(0)6(0)7(3)9(4)10(0)11(0)12(0)201(1)301(0)401(0)402(0)403(0)404(6)405(0)406(0)407(0)501(0)

IR 05000458/2016002: 1 2 3

Finding List (River Bend) @ 2016Q2

CCA Matrix: 2016Q2

	Q	CCA	Title
05000458/FIN-2015008-04	2015Q3	H.1	Failure to Identify an Adverse Trend in the Performance of Post Maintenance Testing on High Critical Components
05000458/FIN-2015008-03	2015Q3	H.2	Failure to Preclude Repetition of Consequential Gaps in Operator Performance
05000458/FIN-2015405-01	2015Q3		Security
05000458/FIN-2015003-01	2015Q3	H.12	Failure to Operate the Unit 1 Feedwater System In Accordance With Procedures
05000458/FIN-2015008-01	2015Q3	H.1	Failure to Recognize Violations of Contamination Control Requirements as Adverse Conditions
05000458/FIN-2015008-02	2015Q3	H.9	Failure to Promptly Document Adverse Conditions in the Corrective Action Program
05000458/FIN-2015403-01	2015Q4		Security
05000458/FIN-2015007-02	2015Q4		Failure to Obtain Prior NRC Approval for a Change in Reactor Core Isolation Cooling Injection Point
05000458/FIN-2015007-01	2015Q4	P.1	Failure to Establish Adequate Procedures for Severe Weather Operations
05000458/FIN-2015004-01	2015Q4	H.8	Failure to Ensure Work Hours are Within Work Hour Limits
05000458/FIN-2015004-02	2015Q4	H.3	Failure to Properly Implement Surveillance Testing of Penetration Valve Leakage Control System Leads to Inoperability in Excess of Technical Specification Allowed Outage Time
05000458/FIN-2015004-03	2015Q4	H.5	Failure to Conduct Operations and Control Work Practices to Minimize Residual Radioactivity into the Site, including the Subsurface
05000458/FIN-2015004-05	2015Q4	H.12	Failure to Follow Procedure Results in Inadvertent Draindown of Reactor Pressure Vessel
05000458/FIN-2015004-06	2015Q4	H.8	Failure to Restore Main Steam Positive Leakage Control System to Operable Prior to Changing Modes
05000458/FIN-2015004-04	2015Q4		Failure to Make a Notification to NRC Operations Center Regarding a Radioactive Spill Reported to Another Government Agency
05000458/FIN-2015010-02	2016Q1	H.1	Failure to Adequately Assess Risk During Chiller Unavailability
05000458/FIN-2015010-01	2016Q1		Technical Specification Allowed Outage Time During Loss of Non-Technical Specification Supported Systems
05000458/FIN-2015010-04	2016Q1	H.14	Failure to Accomplish an Operability Determination In Accordance With Procedures
05000458/FIN-2016009-02	2016Q1		Failure to Establish Adequate Procedural Guidance
05000458/FIN-2016201-01	2016Q1		Security
05000458/FIN-2016009-03	2016Q1	P.2	Failure to Implement Corrective Actions to Prevent the Recurrence of a Reactor Scram Due to Grid Disturbances
05000458/FIN-2015010-03	2016Q1	P.5	Failure to Identify and Correct Circuit Breaker Failure Mechanism
05000458/FIN-2016009-04	2016Q1	H.14	Failure to Adequately Assess Risk During Motor Generator Set Unavailability
05000458/FIN-2016009-01	2016Q1	H.2	Failure to Follow Procedure While Installing Jumpers for Shutdown Cooling
05000458/FIN-2015010-05	2016Q1	H.12	Failure to Identify and Correct an Adverse Condition in a Timely Manner
05000458/FIN-2016007-03	2016Q2		Failure to Demonstrate that Appendix R Emergency Lights Satisfied their Maintenance Rule Performance Criteria
05000458/FIN-2016007-02	2016Q2		Failure to Isolate Control Circuits for Safe Shutdown Equipment From the Effects of a Control Room Fire
05000458/FIN-2016007-01	2016Q2		Inadequate Loop Flow Test Procedure
05000458/FIN-2016002-03	2016Q2	H.4	Failure to Identify and Correct Improperly Stowed Transient Combustibles
05000458/FIN-2016002-02	2016Q2	H.13	Failure to Conduct Common Cause Failure Evaluation in Response to Inoperable Emergency Diesel Generator
05000458/FIN-2016002-01	2016Q2	H.5	Failure to Follow Station Guidance on Use of Temporary Power Cables and Control of Transient Combustibles

Self-Identified List (River Bend)

	Q	Title
05000458/FIN-2015003-02	2015Q3	Licensee-Identified Violation
05000458/FIN-2015007-03	2015Q4	Licensee-Identified Violation
05000458/FIN-2015004-07	2015Q4	Licensee-Identified Violation
05000458/FIN-2015403-02	2015Q4	Licensee-Identified Violation

[River Bend Findings full list]

05000458/FIN-2016002-02

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