05000458/FIN-2012004-01

Finding

Title

Improper Hydrogen Igniter Breaker Trip Coil Setting

Description

The inspectors reviewed a self-revealing non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to correctly translate the design bases for the power supply for the hydrogen igniter system into procedures used to set the associated power system supply breaker trip coil. The licensees immediate corrective actions included evaluating the proper trip coil setting and adjusting the trip coil accordingly. The station documented the finding in Condition Report CR-RBS-2012-02623. This performance deficiency is more-than-minor and is therefore a finding because it is associated with the design control attribute of the Barrier Integrity Cornerstone and adversely affected the cornerstones objective to ensure that physical design barriers (fuel cladding, reactor coolant system, and containment) protect the public from radionuclide releases caused by accidents or events. Specifically, this performance deficiency resulted in an incorrect trip coil setting, which decreased the reliability of the hydrogen igniters, which burn hydrogen in a controlled manner to prevent containment damage. Using Inspection Manual Chapter 0609.04, Initial Characterization of Findings, the finding required a significance evaluation per Inspection Manual Chapter 0609, Appendix H, Containment Integrity Significance Determination Process, because the unavailable Division 1 hydrogen igniters represented a degraded condition affecting containment barrier integrity that can potentially increase large early release frequency (LERF) without affecting the core damage frequency (CDF). Inspectors determined that this was a type B finding. Using section 6.0, the inspectors determined that the finding was of very low safety significance (Green) because the hydrogen igniters are arranged in two independent divisions such that each containment region has two igniters, one from each division, controlled and powered redundantly so that ignition would occur in each region even if one division failed to energize. The inspectors determined that the apparent cause of this finding was that in response to earlier failures of the trip coil, the licensee had not investigated the problem thoroughly enough to identify and correct this performance deficiency. However, because the earlier failures had all occurred more than seven years ago, the inspectors determined that this cause did not reflect present licensee performance, so the inspectors did not assign a crosscutting aspect to it.

01
Site:	River Bend
Report	IR 05000458/2012004 Section 1R15
Date counted	Sep 30, 2012 (2012Q3)
Type:	NCV: Green
cornerstone	Barrier Integrity
Identified by:	Self-revealing
Inspection Procedure:	IP 71111.15
Inspectors (proximate)	G Guerra P Elkmann A Barrett W Sifre J Laughlin R Hagar M Young G Larkin G Apger B Rice C Steely D Strickland
INPO aspect
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v • d • e

Finding - River Bend - IR 05000458/2012004

1(0)2(10)3(7)4(4)5(6)6(0)9(8)10(8)11(0)12(5)13(0)301(0)403(2)404(1)503(0)801(0)31(0)

IR 05000458/2012004: 1 2 3 4

Finding List (River Bend) @ 2012Q3

CCA Matrix: 2012Q3

	Q	CCA	Title
05000458/FIN-2011008-04	2011Q4		Station Blackout-Containment Venting
05000458/FIN-2011402-01	2011Q4	H.14	Security
05000458/FIN-2011008-09	2011Q4	H.9	Inadequate Simulator Fidelity for Emergency Diesel Generator Loading
05000458/FIN-2011008-08	2011Q4	P.5	Inadequate Emergency and Abnormal Procedures for Standby Diesel Generator Fail to Load Sequences
05000458/FIN-2011008-07	2011Q4	H.9	Inadequate Abnormal Procedure for Reducing Loads on Standby Diesel Generators
05000458/FIN-2011008-05	2011Q4		Inadequate Procedures for Monitoring Standby Service Water System Leakage
05000458/FIN-2011008-03	2011Q4		Failure to Establish Residual Heat Removal Heat Exchanger Testing Frequency
05000458/FIN-2011008-02	2011Q4	P.2	Failure to Use Conservative Design Assumptions in the Ultimate Heat Sink Inventory Calculation
05000458/FIN-2011008-01	2011Q4	P.2	Inadequate Testing of Division I and Division III Standby Diesel Generators
05000458/FIN-2011005-02	2011Q4	H.2	Failure to Adequately Monitor the Performance of the Control Building Chiller System
05000458/FIN-2011005-01	2011Q4	H.12	Standby Service Water Pump Motor Lubrication Deficiencies
05000458/FIN-2011008-06	2011Q4		Failure to Obtain NRC Approval for Change to Ultimate Heat Sink Inventory Requirements
05000458/FIN-2012002-03	2012Q1	H.14	Failure to Verify Assumptions used in Standby Equipment Room Temperature Analysis
05000458/FIN-2012002-04	2012Q1	H.7	Failure to Appropriately Set Reactor Core Isolation Cooling Flow Controller High Output Limit
05000458/FIN-2012002-06	2012Q1	H.7	Inadequate Maintenance Instructions for the Suppression Pool Cooling Isolation Valves
05000458/FIN-2012002-07	2012Q1	H.8	Failure to Perform a Radiation Survey
05000458/FIN-2012002-08	2012Q1	H.2	Failure to Control Access to a High Radiation Area
05000458/FIN-2012002-09	2012Q1		Failure to Properly Fabricate and Install the mid-Standard Turbine Shaft Brush
05000458/FIN-2012002-05	2012Q1	H.8	Inadequate Relief Valve Configuration Control Results in a Reactor Downpower
05000458/FIN-2012002-02	2012Q1	H.8	Failure to Appropriately Assess and Manage Risk for Internal Flooding Events
05000458/FIN-2012002-01	2012Q1	H.9	Failure to Adequately Monitor the Performance of the Digital Radiation Monitoring System
05000458/FIN-2012003-01	2012Q2	H.2	Failure to Follow Procedure to Protect Sensitive Plant Areas
05000458/FIN-2012003-02	2012Q2	H.13	Failure to Follow Severe Weather Operations Procedure
05000458/FIN-2012003-03	2012Q2	P.1	High Pressure Core Spray Diesel Generator Bearing Lubrication Deficiencies
05000458/FIN-2012003-04	2012Q2		Failure to Properly Assemble Turbine Control Valve Push ROD-SPRING Housing Coupling
05000458/FIN-2012003-05	2012Q2		Failure to Specify Manual Actions for Safety Relief Valve Operations During a Station Blackout Event
05000458/FIN-2012004-01	2012Q3		Improper Hydrogen Igniter Breaker Trip Coil Setting
05000458/FIN-2012010-02	2012Q3	H.14	Failure to Declare Reactor Core Isolation Cooling System Inoperable
05000458/FIN-2012009-08	2012Q3		Ability to Promptly Staff the Fire Brigade at All Times During Plant Operation
05000458/FIN-2012009-07	2012Q3		Onsite Safety Review Committee Implementation
05000458/FIN-2012009-06	2012Q3		Implementation of the Station Cable Reliability Program
05000458/FIN-2012009-05	2012Q3		Implementation of Vendor and Industry Recommended Relay Testing and Maintenance
05000458/FIN-2012009-04	2012Q3		Corrective Action Program Implementation for Prior Lockout Relay Failure in February 2011
05000458/FIN-2012009-03	2012Q3		Implementation of the Procedure for Infrequently Performed Tests or Evolutions
05000458/FIN-2012009-02	2012Q3		Past Operability of the Reactor Core Isolation Cooling System
05000458/FIN-2012009-01	2012Q3		Main Control Room Annunciator Control and Conduct of Operations
05000458/FIN-2012004-04	2012Q3	H.5	Inadequate Verification of Leading Edge Flow Meter Functionality
05000458/FIN-2012004-03	2012Q3	P.5	Failure to Appropriately Tune the Reactor Core Isolation Cooling Turbine Speed Controller
05000458/FIN-2012004-02	2012Q3	H.6	Untimely Corrective Actions to Ensure Reliability of the 480 Vac Molded Case Circuit Breakers and Unitized Motor Starters
05000458/FIN-2012010-03	2012Q3	H.14	Failure to Establish an Adequate Controlling Procedure for Stroking Safety Relief Valves at LOW Power
05000458/FIN-2012010-04	2012Q3	H.5	Failue to Implement Effective Corrective Actions for Lockout Relay Failures
05000458/FIN-2012010-05	2012Q3		Failure to Est Lockout Relays in Accordance with Vendor Testing Practices
05000458/FIN-2012010-06	2012Q3	P.5	Failure to Establish an Adequate Cable Reliability Program
05000458/FIN-2012010-01	2012Q3		Failure to Correct Spurious Isolation of Reactor Core Isolation Cooling System
05000458/FIN-2012010-07	2012Q3	H.13	Loss of Onsite Safety Review Committee Independence
05000458/FIN-2012010-08	2012Q3	H.7	Failure to Prevent Conflicts of Duty for Fire Brigade Members

Self-Identified List (River Bend)

	Q	Title
05000458/FIN-2012002-10	2012Q1	Licensee-Identified Violation
05000458/FIN-2012003-06	2012Q2	Licensee-Identified Violation
05000458/FIN-2012003-07	2012Q2	Licensee-Identified Violation
05000458/FIN-2012404-01	2012Q2	Security

[River Bend Findings full list]

05000458/FIN-2012004-01

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