Attachment 25 Non-proprietary Westinghouse Electric .
Attachment 25Non-proprietary Westinghouse Electric Company document WNA-AR-00189-WBT-NP,"Post Accident Monitoring System Reliability Analysis," Revision 1
* WestinghouseWestinghouse Non-Proprietary Class 3Nuclear AutomationWatts Bar Unit 2 NSSS Completion ProgramI&C ProjectsPost Accident Monitoring SystemReliability AnalysisWNA-AR-00189-WBT-NP,Rev. 1October 2011APPROVALSFunctionName and SignatureAuthorStephen A. Nass*Principal Engineer, Risk Applications & Methods IReviewerDennis N. Menard*Principal Engineer, Safety Systems Support & UpgradesStephanie L. Smith*Project Manager, Nuclear Automation LicensingApproverRobert E. Single*Manager, Reactor Protection Systems AP 1000 China*Electronically approved records are authenticated in the electronic document management system.WESTINGHOUSE NON-PROPRIETARY CLASS 3 2011 Westinghouse Electric Company LLCAll Rights Reserved
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisLIST OF CONTRIBUTORSRevision0, 1IName and TitleJenna L. TygerTechnical Editor, Technical CommunicationsMatthew A. ShakunEngineer, Nuclear Automation LicensingTemplate Version 2.2WNA-AR-00189-WBT-NP, Rev. 1iWestinghouse Non-Proprietary Class 3
Post Accident Monitoring SystemReliability AnalysisNuclear AutomationWatts Bar Unit 2 NSSS Completion Pro2ram I&C ProlectsREVISION HISTORYRECORD OF phen A. NassThis version is based on VWNAAR-00189-WBT withproprietary information redacted.1Stephen A. NassFigures 2.1-1 and 2.1-2 wereupdated.See EDMSReferences were updated tolatest applicable revision.Minor editorial and formattingchanges were made.DOCUMENT TRACEABILITY & COMPLIANCECreated to Support the Following Document(s)Document NumberRevisionN/AOPEN , Rev. 1iiWestinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisTABLE OF CONTENTSSectionTitlePageLIST OF CONTRIBUTORS .REVISION HISTORY .TABLE OF CONTENTS .LIST OF TABLES .LIST OF FIGURES .ACRONYM S AND TRADEM ARK S .GLOSSARY OF TERM S .REFERENCES .iiiiiivvviiviiiixSECTION 1INTRODUCTION .1-11.11.21.31.4PURPOSE .SCOPE .AVAILABILITY GOALS .SUM M ARY OF RESULTS .1-11-11-11-1SECTION 2SYSTEM DESCRIPTION .2-12.12.2SYSTEM ARCHITECTURE .FAILURE M ODES AND EFFECTS .2-12-3SECTION 3ANALYSIS ASSUMPTIONS AND CONSIDERATIONS .3-1SECTION 4RELIABILITY M ODELIN G .4-14.14.24.2.14.2.2BLOCK DIAGRA M M ODELS .AVAILABILITY EQUATIONS .Component Availability .System Availability .4-14-64-74-7SECTION 5FAILURE RATE DATA .5-15.15.25.35.45.55.65.7AC160 COMPONENTS .SENSORS .FLAT PANEL DISPLAYS .PC NODE BOX .PROBABILITY OF FAILURE DETECTION .SURVEILLAN CE TEST INTERVAL .M EAN TIM E TO REPAIR .5-15-25-35-35-35-4.5-4SECTION 6RELIABILITY CALCULATIONS .6-1WNA-AR-00189-WBT-NP, Rev. 1iiiWestinghouse Non-Proprietary Class 3
Post Accident Monitoring SystemReliability AnalysisNuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsTABLE OF CONTENTS (cont.)Section6.16.2TitlePagePAM S AVAILABILITY .SENSITIVITIES .WNA-AR-00189-WBT-NP, Rev. Iiv6-16-10Westinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisTABLE OF CONTENTS (cont.)LIST OF 46.1-156.1-166.1-176.2-1PageA C 160 Failure Rate Data .M TTR .PA M S Com ponent A vailability .Plant Com puter Link A vailability .Com m unications A vailability .O M A vailability .A uxiliary Pow er Supply Availability .D P Cell Pow er Supply A vailability .Chassis Pow er Supply Availability .Bulk Pow er Supply Availability .Pow er Supply Availability .Sensor Inputs for A1687 Card at Position 14 A vailability .Sensor Inputs for A1687 Cards at Positions 11, 12 and 13 Availability .RF620 Extension Subrack A vailability .Sensor Inputs for A1688 Modules at Positions 5 and 6 Availability .Sensor Inputs for D1620 Module at Position 4 Availability .RF616 Prim ary Subrack A vailability .Typical PA M S Train A vailability .PA M S System A vailability .Com ponent FV Importance -96-106-106-11LIST OF FIGURESFigureFigure 2.1 -1Figure 2.1-2Figure 4.1 -1Figure 4.1-2Figure 4.1-3Figure 4.1-4Figure 4.1-5Figure 4.1-6Figure 4.1-7Figure 4.1-8Figure 4.1-9Figure 4.1-10Figure 4.1-11Figure 4.1-12TitlePagePA M S Configuration .Pow er D istribution W iring D iagram .Top Level PA M S RB D .Typical PA M S Train RB D .RF616 Primary Subrack RB D .Sensor Inputs for D1620 M odule at Position 4 RB D .Sensor Inputs for A1688 Modules at Positions 5 and 6 RBD .RF620 Extension Subrack RB D .Sensor Inputs for A1687 Card at Positions 11, 12, and 13 RBD .Sensor Inputs for A1687 Card at Position 14 RB D .Pow er Supply RBD .Bulk Pow er Supply RBD .Chassis Pow er Supply R BD.D PI, D P2, and D P3 Pow er Supply RB D .WNA-AR-00189-WBT-NP, Rev.Rev. 34-44-44-44-54-5Westinghouse Non-Proprietary Class 3Westinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisTABLE OF CONTENTS (cont.)LIST OF FIGURES 1-144.1-154.1-16PageA ux Pow er Supply RBD .OM RBD .Comm unications RBD .Plant Computer Link RBD .Rev. 11WNA-AR-00189-WBT-NP, se Non-Proprietary Class 3Westinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisACRONYMS AND TRADEMARKSAcronyms used in the document are defined in WNA-PS-00016-GEN, "Standard Acronyms andDefinitions" (Reference 1), or included below to ensure unambiguous understanding of their use withinthis document.AcronymDefinitionAC 160Advant Controller series 160Advant Fieldbus 100Common Cause FailureCore Exit ThermocouplesCommon Qualified PlatformDirect CurrentFailure Modes and Effects AnalysisFlat Panel DisplayMaintenance and Test PanelOperator's ModulePost Accident Monitoring SystemPersonal ComputerReliability Block DiagramReference Junction ThermocoupleSub-cooled Margin MonitorSoftware Common Mode FailureAF100CCFCETCommon QDCFMEAFPDMTPOMPAMSPCRBDRJTSMMSWCMFAdvant is a registered trademark of ABB Process Automation Corporation.QNX is a registered trademark of QNX Software Systems GmbH & Co. KG ("QSSKG") and is usedunder license by QSS.Common Q is a trademark or registered trademark in the United States of Westinghouse ElectricCompany LLC, its subsidiaries and/or its affiliates. This mark may also be used and/or registered in othercountries throughout the world. All rights reserved. Unauthorized use is strictly prohibited.All other product and corporate names used in this document may be trademarks or registered trademarksof other companies, and are used only for explanation and to the owners' benefit, without intent toinfringe.WNA-AR-00189-WBT-NP, Rev. 1viiWestinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisGLOSSARY OF TERMSStandard terms used in the document are defined in WNA-PS-00016-GEN, "Standard Acronyms andDefinitions" (Reference 1), or included below to ensure unambiguous understanding of their use withinthis document.TermDefinitionNone.WNA-AR-00189-WBT-NP, Rev.IRev. 1WNA-AR-00189-WBT-NP,viiiviiiWestinghouse Non-Proprietary Class 3Westinghouse Non-Proprietary Class 3
Nuclear AutomationPost Accident Monitoring SystemWatts Bar Unit 2 NSSS Completion Program I&C ProjectsReliability AnalysisREFERENCESFollowing is a list of references used throughout this document.1.WNA-PS-00016-GEN, Rev. 5, "Standard Acronyms and Definitions," Westinghouse ElectricCompany LLC.2.WCAP-16097-P-A, Appendix 1, "Common Qualified Platform Post Accident MonitoringSystems," Westinghouse Electric Company LLC.3.ANSI/IEEE 352, "IEEE Guide for General Principles of Reliability Analysis of Nuclear PowerGenerating Stations Safety Systems," Institute of Electrical and Electronics Engineers, Inc., 1987.4.00000-ICE-30156, Rev. 8, "System Requirements Specification for the Common Q Post AccidentMonitoring System," Westinghouse Electric Company LLC.5.WNA-DS-01617-WBT-P, Rev. 4, "Post Accident Monitoring System - System RequirementsSpecification," Westinghouse Electric Company LLC.6.WNA-DS-01667-WBT-P, Rev. 4, "Post Accident Monitoring System - System DesignSpecification," Westinghouse Electric Company LLC.7.00000-ICE-30155, Rev. 11, "System Requirements Specification for the Common Q Generic FlatPanel Display," Westinghouse Electric Company LLC.8.WNA-AR-00180-WBT-P, Rev. 2, "Failure Modes and Effects Analysis (FMEA) for the PostAccident Monitoring System," Westinghouse Electric Company LLC.9.Watts Bar Technical Specification - Section 3.3.3 Post-Accident Monitoring (PAM)Instrumentation, Amendment 55.10.WNA-IG-00056-GEN, Rev. 1, "Standard Reliability Analysis Guidelines," Westinghouse ElectricCompany LLC.11.WNA-IG-00064-GEN, Rev. A, "Reliability and Availability Analysis Methods," WestinghouseElectric Company LLC.12.GKW F 310 708, Rev. 0, "Reliability Data Sheet, Advant Controller 160 Including S600 I/O,"ABB Power Plant Control, February 16, 1998.13.MIL-HDBK-217F, "Military Handbook reliability Prediction of Electronic Equipment," U.S.Department of Defense, December 2, 1991.14.NPRD-95, "Nonelectronic Parts Reliability Data," U.S. Department of Defense Reliability AnalysisCenter, 1995.WNA-AR-00189-WBT-NP, Rev. 1ixWestinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisREFERENCES (cont.)15.NUREG/CR-6928, "Industry-Average Performance for Components and Initiating Events at U.S.Commercial Nuclear Power Plants," U.S. Nuclear Regulatory Commission, February 2007.(Last Page of Front Matter)WNA-AR-00189-WBT-NP, Rev. IXWestinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisSECTION 1INTRODUCTION1.1PURPOSEThis reliability study provides an estimation of the availability of the Watts Bar Unit 2 Post AccidentMonitoring System (PAMS), which is based on the Common QTM safety platform described inWCAP-16097-P-A, "Common Qualified Platform Post Accident Monitoring Systems," Appendix 1(Reference 2).1.2SCOPEThe scope of the analysis shall include all of the electronics provided for PAMS under the Watts BarUnit 2 NSSS Completion Program Instrumentation & Control (I&C) Project, and the sensors that provideinput to the functions of PAMS.This availability analysis is done in accordance with the guidance provided in ANSI/IEEEStandard 352-1987, "IEEE Guide for General Principles of Reliability Analysis of Nuclear PowerGenerating Stations Safety Systems" (Reference 3). Specifically, the Reliability Block Diagram (RBD)method described in clause 4.3 of that standard will be applied. Other guidance on availabilityquantification found in the standard will also be applied as appropriate.1.3AVAILABILITY GOALS00000-ICE-30156, "System Requirements Specification for the Common Q Post Accident MonitoringSystem" (Reference 4, subsection 3.3.3.2) establishes the operational unavailability goal ofI]a". The quantitative results of this study will be compared to this goal.1.4SUMMARY OF RESULTSThe analysis has shown that the estimated availability of PAMS isfavorably with the required availability of []ac.]a,c.This compares(Last Page of Section 1)WNA-AR-00189-WBT-NP, Rev. 11-1Westinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability AnalysisSECTION 2SYSTEM DESCRIPTION2.1SYSTEM ARCHITECTUREThe Watts Bar Unit 2 PAMS is described in WNA-DS-0 1617-WBT-P, Rev. 4, "Post AccidentMonitoring System - System Requirements Specification" (Reference 5) and WNA-DS-01667-WBT-P,Rev. 4, "Post Accident Monitoring System - System Design Specification" (Reference 6). This system isa two train data acquisition and display system that also performs calculations on the input variables todetermine margins to critical safety function limits. Figure 2.1-1 (refer to Reference 6, Figure 2.1-1)shows the basic architecture of the Watts Bar Unit 2 PAMS. Figure 2.1-2 (refer to Reference 6, Figure4.2-2) shows the power distribution diagram for the Watts Bar Unit 2 PAMS.The Watts Bar Unit 2 PAMS consists of two separate Class IE trains that are built on an Advant Controller 160 (AC160) platform. Each of the two independent trains is capable of carrying out therequired functions. Each train consists of two AC 160 racks, a power supply, and one maintenance andtest panel (MTP). Each train is mounted in a dedicated cabinet, with identical hardware. An operator'smodule (OM) for each train is also provided in the main control room.Each train of PAMS has a flat panel display (FPD) for its MTP and OM. The system requirementsspecification for the FPD is provided in 00000-ICE-30155, Rev. 11, "System Requirements Specificationfor the Common Q Generic Flat Panel Display" (Reference 7).The elements of the PAMS components are interconnected by a fiber optic Advant Fieldbus 100 (AF 100)communications network.WNA-AR-OO 189-WeT-NP, Rev.WNA-AR-00189-WBT-NP,Rev. 1I2-12-1Westinghouse Non-Proprietary Class 3Westinghouse.Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring SystemReliability Analysisa,cFigure 2.1-1. PAMS ConfigurationWNA-AR-00189-WBT-NP, Rev. I2-2Westinghouse Non-Proprietary Class 3
Nuclear AutomationWatts Bar Unit 2 NSSS Completion Program I&C ProjectsPost Accident Monitoring Sy
13. MIL-HDBK-217F, "Military Handbook reliability Prediction of Electronic Equipment," U.S. Department of Defense, December 2, 1991. 14. NPRD-95, "Nonelectronic Parts Reliability Data," U.S. Department of Defense Reliability Analysis Center, 1995. WNA-AR-00189-WBT-NP, Rev. 1 ix Westinghouse Non-Proprietary Class 3
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