ML20135H563

Truth-Analysis/Action-Reaction Review of 480-Volt Essential Bus Tie Breaker Control Scheme, Final Rept

ML20135H563
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/31/1985
From:	PROTO-POWER MANAGEMENT CORP.
To:
Shared Package
ML20135H560	List: ML20135H559 ML20135H563
References
TAC-59801, NUDOCS 8509240015
Download: ML20135H563 (19)

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{{#Wiki_filter:/ V' .N TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL-BUS TIE BREAKER CONTROL SCHEME AUGUST 1985 FINAL REPORT Prepared For Public Service Company of Colorado Nuclear Engineering Division 2420 West Avenue - Suite 100-D Denver, Colorado 80211 Prepared By 8509240015 850913 ' ROTO-POWER CORPORATION PDR ADOCK 05000267 591 Poquonnock Road P PDR Joton, Connecticut 06340 (203) 446-9725 i

~ PEgo i TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME TABLE OF CONTENTS PAGE

1.0 INTRODUCTION

1 2.0

SUMMARY

1 3.0 THE TRUTH-ANALYSIS"/ ACTION-REACTION TECHNIQUES 2 4.0 480V ESSENTIAL BUS TIE BREAKER APPLICATION 3 4.1 Model Development 3 4.2 Evaluation Technique 4 5.0 ANALYSIS RESULTS 4 Appendix A - Model Definition Documentation 7 Appendix B - Modifications 9 This document and all associated documentation is copyrighted and all rights are reserved by Proto-Power Corporation TRUTH-ANALYSIS" is a trademark of Proto-Power Corporation oCopyright 1985 Proto-Power Corporation

Pcga 1 TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME l

1.0 INTRODUCTION

This document presents the results of the TRUTH-ANALYSIS"/ ACTION-REACTION approaches to analyzing the 480V Essential Bus Tie Breaker Control Scheme at' Fort St. Vrain Station. The purpose of this review was to identify discrepancies in the control scheme logic and/or identify potential component single failures that could lead to misoperation of these control schemes. This work was performed in accordance with Public Service Company of Colorado, Purchase Order No. 56813 2nd Proto-Power's authorized engineering task item (7511461) dated July 8, 1985. 2.0

SUMMARY

Proto-Power has used the TRUTH-ANALYSIS" and ACTION-REACTION modeling techniques to identify potential " sneak circuits" and/or identify potential component single failures that could lead to misoperation of the 480V Essential Bus Tie Breaker Control Scheme. The results of this analysis indicate that generally the control system performs as required. The analysis has demonstrated two areas of concern to control system operation: 1. The potential failure of the 480V AC Supply Breakers (252TR1, 252TR2 or 252TR3) to trip following loss of power. 2. The potential failure of the automatic sequence programmer to operate following a single component failure. Failure of the 480V AC Supply Breakers to trip following a loss of power to the 372V level may occur either from the operator failing to place the synchronizing switch in the off position or' failure of that switch. Failure of the automatic sequence programmer to operate may occur in two different sets of circumstances. First, the failure of two adjacent contacts of control relay 286G1A or iH)9G+B, and secondly, the f ailure of two adjacent contacts of control relay CR-9205 or CR-9206. p (

• Copyright 1985 Proto-Power Corporation

PCgD 2 TRUTB-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME Additionally, two other potential sources of single com-ponent failure which may cause control system misoperation have been identified. The potential impact of these two scenarios has been determined not to have an effect on operation. Each of the items discussed above is described in detail in Section 5.0. Appendix B includes the Proto-Power proposed modifications to the' associated circuitry. Generally, the review of the 480V Essential Bus Tie Breaker Control Scheme has confirmed the adequacy of the logic control schemes. The models created in this review provide an accurate representation of the logical relationships of components associated with these control schemes and will provide a method for accurate verification of future modifications to the modeled control schemes. 3.0 THE TRUTH-ANALYSIS"/ ACTION-REACTION TECHNIQUES The TRUTH-ANALYSIS" and ACTION-REACTION computer-aided techniques were developed by the Proto-Power Corporation for use in the analysis of complex instrumentation and control system logic. diagrams or electrical schematics. The technique provides a uniform, consistent method for deter-mining the signal state of each device within a particular control-system based upon the input signals provided to that system. The TRUTH-ANALYSIS" models provide a design tool for a systematic evaluation of individual system component logic inputs and output (s). This evaluation consists of con-verting logic diagrams to matrix-type truth tables by utilizing a computer to generate all possible combinations of inputs and to determine the resultant output (s). System logic errors, if any, will be identified, and recommen-dations to correct errors will be provided to ensure that the systems operate in accordance with design requirements. The ACTION-REACTION models provide a design tool to under-standing and evaluating the operation.of control systems. These models can be based on either logic or schematic diagrams and are used to indicate the control system response to user-specified input and control signals. ocopyright 1985 Proto-Power Corporation

. _ ~ = _ Page 3 l TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF l 480V ESSENTIAL BUS '.?IE BREAKER CONTROL SCHEME 4.0 480V BSSENTIAL BUS TIE BREAKER APPLICATION i The TRUTH-ANALYSIS" and ACTION-REACTION models for the 480V l Essential Bus Control. Scheme have been prepared and ana-lyzed. Initial model development occured during Proto-Power's TRUTH-ANALYSIS"/ ACTION-REACTION Review of Systems 1 and Components Associated with PCRV Moisture Ingress at Fort i St. Vrain Station. This initial version was modified and expanded for this analysis to include, in more detail, j additional circuitry not included in the initial model. Due to the complexity of this control scheme, it was divided into several imodels for a more efficient performance of the TRUTH-ANALYSIS"/ ACTION-REACTION techniques. Model boundaries have been established to include the 480V essential bus undervoltage relays and sensors, the 480V SWGR bus supply breakers,.the 480V essential bus tie breakers, the diesel i generator circuit breakers, the load sequencer, the timers j T1 and T2, and the diesel engine start /run circuitry. 4.1 Model Development Final model delineation was based upon our review of electrical schematics, system descriptions and FSAR sections. A detailed list of documents is provided in Appendix A. The list of models used in our analysis was: 1 List of Models Model Description Analysis Type l { TIEBKR Sensors thru 2/3 logic schemes ACTION-REACTION PWR480 Tie breaker,480V SWGR breaker, ACTION-REACTION load. sequencer and diesel 2 start /run circuitry i SWGBKR 480V SWGR Breaker TRUTH-ANALYSIS" i [ TIMER Timer T1 and T2 ACTION-REACTION i 1 The preliminary results from the models'were presented and discussed in detail with PSC personnel. As a result of those discussions, certain areas of the models were mod _ified'to include additional components l i and to reflect'certain specific component features. 4 i oCopyright 1985 Proto-Power Corporation i .--..m _r,

Pcge 4 TRUTH-ANALYSIS"/ ACTION-REACTION 4 REVIEW OF i 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME 4.2 Evaluation Technique Logic diagrams for each.of the models were drawn to reflect the electrical schematics listed in Appendix A and to emulate proper system o'pe r a t io n. The logic diagrams were then translated into TRUTH-ANALYSIS"/ ) ACTION-REACTION models. Each modal was analyzed by one or both methods, as indicated in the list of models. 4 The ACTION-REACTION type analyFis consisted of the user operating the model by specifying input and control signals and examining the resultant output. The FSAR i sections referenced in Appendix A were used as a guide to operation of the models. Results of the analysis are presented in Section 5.0. f Additionally, ACTION-REACTION modeling techniques.were used to predict and/or confirm the effects of potential component single failure. The effects of specific areas of concern and Proto-Power proposed modifications are. described in Section 5.0. h The TRUTH-ANALYSIS" type analysis consisted of the development of model error definintions which corre-I sponded to specific combinations of component align-ments that were considered to be undesirable. Each possible combination of inputs, control signals and resultant outputs were examined by the computer model and compared to the model error definition. Results of the analysis are presented in Section 5.0. l i 5.0 ANALYSIS RESULTS i From the results of the analysis, the following areas have been identified as potential paths for failure of 480V Essential Bus Tie Breaker Control Scheme to function as designed: i 1. Failure of Control Relay Cr-9203 or CR-9204 t l The relay's function is to align essential bus No. 2 to the first on line diesel generator with two diesel l engines running. 1 Failure of contact-(1-2) will prevent the bus tie breaker of the first on line diesel generator. bus from closing. The other bus tie breaker will close if the "second on line diesel generator has two diesel engines running. i oCopyright 1985 Proto-Power Corporation

Patge 5 [ TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME Recommendation Essential bus No. 2 loads are not sequenced onto the bus via the automatic sequence programmer from the first diesel generator. Essential bus No. 2 is connected to n and sequenced onto the bus via 'the automatic sequencer programmer from the second on line diesel generator with no effect on operation. Proto-Power does not recommend any changes at this time. 2. Failure of Control Relays 286G1A or 286G1B 1 { The' relay's function is to lockout the second on line diesel generator from realigning the bus tie breakers. Failure of two adjacent contacts (11-11C) and (12-12C) will prevent the ' automatic sequencer programmer from operating. i Recommendation Relay 286G1A or 286G1B construction is such that contact failure of these two (2) adjacent contacts while the remaining contacts operate, would prevent the relay from performing its required function. Failure of the entire relay does not produce this result. Therefore, Proto-l Power recommends PSC consider rewiring one contact to provide a means of eliminating the effect of this single 4 i failure. The proposed schematic changes to prevent this . failure are shown in Appendix B. 3. Failure of Control Relay CR-9205 or CR-9206 l j The relay's function is to align the automatic sequence programmers to the proper diesel generators. Failure of two adjacent _ contacts (3-4) and (7-8) l-will prevent the automatic sequencer programmer from operating for the first on line diesel generator. ~ Neither Drums 1 nor 2 will operate. l Recommendation Relay CR-9205 or.CR-9206 construction is such that contact failure of these two (2) adjacent contacts while the remaining contacts operate, would ' prevent the relay from performing its required f unction. Failure of the i entire. relay does not produce this result. Therefore, 4 ocopyright 1985 Proto-Power Corporation

Pcgo 6 TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME Proto-Power recommends PSC consider rewiring one contact to another deck of the relay, both contacts are presently wired to the same deck. The proposed sche-matic changes to prevent this failure are shown in Appendix B. 4. 480V AC Supply Breakers 252TR1, 252TR2 or 252TR3 On loss of power to the 372V (77.5%) level, the associ-ated supply breaker is tripped and the associated bus tie breaker is closed to align the bus to another operating bus. Failure of the operator to return the synchronizing switch to the off position or failure of the synchronizing switch will prevent the supply breaker from tripping on loss of power. The degraded bus will be paralleled to the operating bus via the bus ~ tie breaker without synchronizing the power. Recommendatian Proto-Power recommends PSC consider wiring a normally closed contact of the supply breaker in series with the applicable contact that closes the bus tie breaker. This will prevent the bus tie breaker from closing if the supply breaker does not open. The proposed sche-matic changes to prevent this failure are shown in Appendix B. 1 i l 1 oCopyright 1985 Proto-Power Corporation

Pcge 7 TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME J Appendix A - Model Definition Documentation s t 8 Copyright 1985 Proto-Power Corporation

Page 8 TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME The following documents were used in the development of the TRUTH-ANALYSIS"/ ACTION-REACTION models. A. Electrical Schematics E1203 P20 Rev.L E1203 P21 Rev.L E1203 P43 Rev.R E1203 P44 Rev.P E1203 P47 Rev.S E1203 P48 Rev.S E1203 P36 Rev.M E1203 P37 Rev.R E1203 P38 Rev.M E1203 P1600 Rev.K E1203 P1601 Rev.V E1203 P1602 Rev.L E1203 P2201 Rev.A thru (18 sheets) E1203 P2218 Rev.A E1204 - Rev.T E1205 - Rev.S E1207 - Rev.AA E1208 - Rev.Z B. Applicable System Descriptions (SD-92) C. FSAR Description (8.2.2.2 thru 8.2.5.3.2) I l l

1. Copyright 1985 Proto-Power Corporation

Page 9 TRUTH-ANALYSIS"/ ACTION-REACTION REVIEW OF 480V ESSENTIAL BUS TIE BREAKER CONTROL SCHEME l 4 1 Appendix B - Modifications i 4 oCopyright 1985 Proto-Power Corporation

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