Technical Evaluation Report

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PNL-6287

Technical Evaluation Report

Study Group Review of Nuclear Service Diesel Generator Testing and Aging Mitigation K. R. Hoopingarner B. 3.Kirkwood P. J.Louzecky

March 1988 Prepared for the U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Engineering under Contract DE-AC06-76RLO 1830 NRC/RES FIN 2911 Pacific Northwest Laboratory Operated for the U.S. Department of Energy by Battelle Memorial Institute

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PNL-6287

TECHNICAL EVALUATION REPORT

STUDY GROUP REVIEW OF NUCLEAR SERVICE DIESEL GENERATOR TESTING AND AGING MITIGATION

K. R. Hoopingarner B. J. Kirkwood af P. J. Louzeckyja

March 1988

Prepared for the U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Engineering under Contract DE-AC06-76RL0 1830 NRC/RES FIN 2911

Pacific Northwest Laboratory Richland, Washington 99352

(a) Independent consultants.

ABSTRACT As part of the Nuclear Plant Aging Research (NPAR) Program, the Pacific Northwest Laboratory is performing a Diesel Generator Aging Assessment Study for the U.S. Nuclear Regulatory Commission. In the on-going NPAR Phase II of the aging study, efforts have been focused on aging mitigation and other success strategies for improving nuclear plant diesel generator operation and maintenance. A study group of diesel experts, the authors of this report, met on April 29 and 30, 1987, to resolve issues on diesel generator aging mitigation and improved operations, testing and maintenance. This report documents the conclusions and recommendations of the study group. If these recommendations are put into practice, the experts agreed that many of the engine aging stressors could be either eliminated or their effects could be managed to reduce failures. The focus of the study group was to 1) address the diesel generator aging stressors resulting from the present nuclear industry testing practices, and 2) propose potential mitigating measures. A new recommended testing program was developed and is documented in this report. It appears that, if implemented, the recommended program could greatly reduce the fast-start aging stressor and improve the operability and reliability of diesel generators.

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CONTENTS' ABSTRACT ...................... 1.0 EXECUTIVE SUMMARY AND GENERAL BACKGROUND ...... 1.1 1.2 2.0 EXECUTIVE SUMMARY.............................................. BACKGROUND ....... ........................................... ..................... .................. .....................

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1.1 1.1 1.3 2.1 2.2 2.3
............................ .......................

TESTING AND INSPECTION .. 2.1 2.2

TESTING AND INSPECTION ASSUMPTIONS .......................... TESTING RECOMMENDATIONS ...... 2.2.1 2.2.2 2.2.3 2.2.4 Periodic Testing Recommended Engine Test Starting and Loading

2.3 2.4 2.5 2.6

Engine Test Operation ................ o......... ...... Testing After Specific Faults and Maintenance ... .....

2.3 INSPECTION RECOMMENDATIONS ......
2.3.1 2.3.2 2.3.3 3.0 Weekly Inspections ..........

..............................

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2.6 2.7 2.7 2.9 3.1 3.4 3.6 3.6 4.1 4.1 4.1 4.2 492

.... ......

............. ....
.................

Monthly and Quarterly Inspections .....

Yearly or Refueling Outage Inspections .................

MONITORING AND TRENDING .... oo ............. 3.1 3.2 3.3 MONTHLY MONITORING ... ..... .............. ...........
.............

OTHER PERIODIC MONITORING ........................ TRENDING .. .............................

4.0

MODIFICATIONS, TRAINING AND MAINTENANCE 4.1 MODIFICATIONS ........ oo 4.1.1 4.1.2 4.2

............................

........................

New Modifications Recommended .......................... Optional Modifications .................. .........

TRAINING ...........................

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4.3 5.0

MAINTENANCE ...............

...

4.3 o....................... 5.1 5.1 0....... 6.1...
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