ML16342D535

WCAP-14826, Instrumentation Calibr & Drift Evaluation Process for Diablo Canyon Units 1 & 2,24 Month Fuel Cycle Evaluation.

ML16342D535
Person / Time
Site:	Diablo Canyon
Issue date:	01/31/1997
From:	Trozzo R, Tuley C WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML16342D530	List: ML16342D529 ML16342D531 ML16342D532 ML16342D533 ML16342D535 ML16343A474 ML17083C623
References
WCAP-14826, NUDOCS 9702120285
Download: ML16342D535 (68)

Text

Westinghouse Non-Proprietary Class 3 pocket I'~'cgaSS10A

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Instrumentation Calibration and Drift Evaluation Process for Diablo Canyon Units 1 and 2 24 Month Fuel Cycle Evaluation Westinghouse Energy Systems 9'702120285 9'70133.

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SZSTINGHOUSE NON-PROPRlETARY CL4SS 3 WCAP-14826 INSTRUMENTATIONCALIBRATIONAND DRIFT EVALUATIONPROCESS FOR DIABLO CANYON UNITS 1 AND 2 24 MONTH FUEL CYCLE EVALUATION January, 1997 R. W. Trozzo C. R. Tuley

'WESTINGHOUSE ELECTRIC CORPORATION Nuclear Services Divivion P.O. Box 355 Pittsburgh, Pennsylvania 15230-0355 1997 Westinghouse Electric Corp., All Rights Reserved

FOREWORD This information is being submitted in support of the PACIFIC GAS AND ELECTRIC DIABLO CANYON I/2 24 Month Extended Fuel Cycle Program.

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ACKNOWLEDGlVKÃTS The authors of this report wish to acknowledge L. Bates, T. Donat, and P. Kennevan for their cooperation and technical assistance throughout the Diablo Canyon Units 1 and 2 Extended Surveillance Interval Program.

I' TABLE OF CONTF2G'S

1.0 INTRODUCTION

................................... 2.0 PROCESS DESCRIPTION ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~ ~ ~

2.1 INPUT DATA ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

2.2 PROBABILITY/CONFIDENCELEVEL 2.3 DISTRIBUTION FUNCTION EVALUATION 2.4 OU'lI 'IER EVALUATION ...................... 2.5 DRIFT/CALIBRATIONACCURACY DETERMINATION 2.6 TIME DEPENDENCE 3.0 RES ULTS o ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

3.1 TRANSMITJKRS/SENSORS 3.1.1 CALIBRATIONACCURACY 3 .1.2 DRIFT ............e ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 3.2 PROCESS RACKS ........................... 3.2.1 CALIBRATIONACCURACY 3 .2.2 DRIFT ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

4.0 CONCLUSION

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 16 Figure 1 WESTINGHOUSE CALIBRATIONACCURACY & DRIFT EVALUATIONPROCESS ............................ TABLE 1: DIABLO CANYON UNITS 1 & 2 DRIFT

SUMMARY

......... APPENDIX A DIABLO CANYON UNITS 1 & 2 SAMPLE DRIFT EVALUATIONOUTPUT NARROW RANGE STEVrI GENERATOR LEVEL TRANSMITTERS ...... - lll-

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'a INSTRUMENTATIONCALIBRATIONAND DRIFT EVALUATIONPROCESS FOR DIABLO CANYON UNITS 1/2 FUEL CYCLE EXTENSION TO 24 MONTHS

1.0 INTRODUCTION

In support of the extension of fuel cycles to 24 months, Enclosure 2 to Generic Letter 91-04 requires that plant instrument drift be reviewed for consistency with setpoint uncertainty calculations under the extended operating cycle. Westinghouse has developed a process to accomplish this for instrumentation calibration accuracy and drift for a 24 month fuel cycle. An overview of this process is shown in Figure 1. The plant as left and as found calibration data is first organized into computer spreadsheets and examined with respect to distribution type using commercially available software. Next, the sample data is extrapolated to the population using descriptive statistics and tolerance factors, resulting in calibration accuracy or drift allowances at specified probability (or proportion) and confidence levels. Finally, the drift data is examined for the indications of time dependence and adjustments are made, as appropriate, to yield instrumentation drift allowances applicable to a 24 month fuel cycle, i.e., a maximum surveillance interval of 30 calendar months. An integral part of this process is the continual screening of data integrity and the removal, as appropriate, of nonrepresentative data sets based on the identification of mechanistic causes or statistical outliers.

2.0 PROCESS DESCRIPTION 2.1 INPUT DATA

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+a,c Note that there typically exists several functions where past operating data is not available due to the replacement of the instrumentation with devices of a different manufacturer/model. For these cases, manufacturer's specifications along with engineering judgement and knowledge gained from evaluations of similar instruments at Diablo Canyon as well as other plants are used as the basis to estimate a conservative drift allowance.

2.2 PROBABILITY/CONFIDENCE LEVEL

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+a,c 2.3 DISTRIBUTION FUNCTION EVALUATION

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+a,c 2.4 OUTLIER EVALUATION

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+a,c DRIFT/CALIBRATIONACCURACY DET1<WMINATION

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+a,c 2.6 TIME DEPENDENCE Up to this point in the process, the x + ks drift values have been derived from as left and as found data without regard to the time interval associated with each surveillance. Since an objective of the drift evaluation process is to evaluate past performance for a nominal 18 month fuel cycle and to predict performance for a 24 month fuel cycle, an evaluation of the time dependence of drift is performed. The process involves a combination of qualitative and quantitative checks to determine whether a time dependency exists and, if so, to determine a drift value applicable to a 30 month surveillance period. [

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+a,c 3.0 RESULTS The calibration accuracy and drift evaluation process described in Section 2 was employed to evaluate the RPS/ESFAS functions affected by the Diablo Canyon Units 1 and 2 Fuel Cycle Extension program. The results of these evaluations will be discussed for transmitters/sensors and process racks.

t 3.1 TRANSMITTk&S/SENSORS All transmitters and sensors were evaluated for both calibration accuracy and drift.

3.1.1 CALIBRATIONACCURACY

+a,c 3.1.2 DRIFT

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+a,c 3.2 PROCESS RACKS Westinghouse evaluated several different types of process rack equipment which are affected by the 24 month surveillance extension. This equipment includes process computer point indication, control board indicators and a limited number of analog rack modules. All equipment was evaluated for both calibration accuracy and drift.

3.2.1 CALIBRATIONACCURACY

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4.0 CONCLUSION

In support of the extension of fuel cycles to 24 months in accordance with Generic Letter 91-04, a process has been identified to evaluate instrument calibration accuracy and drift based on plant as left and as found calibration data. This process has been applied to the RPS/ESFAS functions affected by the Diablo Canyon 1 and 2 fuel cycle extension to 24 months. These evaluations have concluded that the calibration accuracy achieved by the plant I&C staff is within procedural tolerances and consistent with the assumptions of the statistical setpoint methodology, The as left and as found data has been evaluated to determine drift on a 95/95 basis, including an evaluation of potential time dependence.

The resulting drift allowances have been incorporated in setpoint uncertainty evaluations and will serve as a basis for evaluating drift at the increased surveillance interval.

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FIGURE 1 WESTINGHOUSE CALIBRATION ACCURAC Y 8 DRIF T EVALUATION PROCESS +a,c

TABLE 1: DIABLO CANYON UNITS 1 5 2 DRIFT SUIIlIIMARY Transmitter Channel Function Device Drift Approx. Max r Notes d Data Pts Prcssurizcr Pressure low, High, Low Si. ITDP Roscmount 1154SHSRC Pressurizer Level <<gh, Control Rosemount II53HD5 RCS Flow Low, ITDP Roscmount 1153HD5RC Barton 784 Narrow Range Stcam Generator Low Low, High High, Rosemount 1154DP4RC level Control Containment Pressure High, High-High Roscmount 1154DPSRC Steam Generator Prcssure Low Sl, ITDP Barton 783 High Negative Rate Rosemount 1154SH9RC Feedweter Flow ITDP Rosemount 1153HD5RC Turbine I'tage Pressure ITDP Barton 783 Roscmount 1153GD8RC RCP uV Rchrys Undervoltege Basler BE1.27 RCP uF Relays Underfrequancy Basler BE14II Seismic Triggers High Ianemetrics TS33A 4KV uV Relays Undervoltage Wasterghouse General Electric Feedwater Temperature ITDP Type E Thcrmocouplcs TCsf WP250

Rack Channel Function Device Drift Approx. Max r Notes I Data Pts Pressunter Pressure ITDP W VX.252 Indicator Pressuriter Level Control W VX 252 Indicator RCS Flow ITDP W VX.252 Indicator Narrow Range Steam Generator Control W VX.252 Indicator level Stcam Generator Pressure ITDP W VX.252 Indicator RCS T ITDP W VX.252 Indicator Pressurirsr Pressure ITDP W P.250 Computer Stcam Generator Pressure ITDP W P-250 Computer To*inc 1'tage Pressure ITDP W 7100 Analog Racks

APPENDIX A DIABLO CANYON UNITS 1 dk 2 SAMPLE DRIFT EVALUATIONOVIPUT NARROW RANGE STEAM GENFKATOR LEVEL TRANSMITTk&S

NARROW RANGE STE~ GENERATOR LEVEL TRANSMXITERS SENSOR DKFT - ROSEMOUNT 1154DP4RC

SPREAD SHEET DATA

SPREAD SHEET DATA (CORI~IED)

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PGE NR STEAM GENEEMTOR LEVEL SENSOR DRIFT

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PGE NR STEQvl GENERATOR LEVEL SENSOR DRIFT (CONTQ'RJED)

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