ML20035G065

Forwards NUMARC Proposed Additions to Maintenance Rule Implementation Guideline 93-01 Re EDG Reliability

ML20035G065
Person / Time
Issue date:	03/05/1993
From:	Correia R Office of Nuclear Reactor Regulation
To:	Zech G Office of Nuclear Reactor Regulation
References
NUDOCS 9304260099
Download: ML20035G065 (4)

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UNITED STATES 8

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March 5,1993 Memorandum To:

Gary G. Zech, Chief Performance and Quality Evaluation Branch, h7tR

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From:

Richard P.Correia, Chief Section B Performance and Quality Evaluation Branch, NRR l

Subject:

PROPOSED ADDITIONS TO NUMARC 93-01 REGARDING EDG i

RELIABILITY Attached for your review and comment is NUMARC's proposed additions to the NUMARC maintenance rule implementation guideline,93-01, regarding EDG reliability and bcensee t

commitments to the SBO coping analysis reliability target values.

original signed byr Richard P.Correia, Chief Section B Performance and Quality Evaluation Branch, NRR

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E.Rossi R.Zimmerman G.Zech G. Grant O.Rothberg T.Foley C.Petrone P.O'Reilly Distribution:

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1 performance related data. In addition to the assumptions made in and results of 2

reliability approaches to maintenance, the a.sumptions in or results of IPEs/PRAs

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3 should also be considered when establishing goals. In addition plants may consider I

4 analytical techniques (e.g., system unavailability modeling) for developing goals. When 5

selecting a goal, the data should be collected over a sufficient length of time to 6

minimize the effects of a random event.

7 8

Monitoring should consist of periodically gathering, trending, and evaluating 9

information pertinent to the performance, and/or availability of the SSCs and comparing j

10 the results with the established goals and performance criteria to verify that the goals are 11 being met. Monitoring results (including (a)(1) and (a)(2) activities) should be analyzed 12 in a timely manner to assure that appropriate action is taken.

13 14 Regulations and licensee commitments (@Ei6sTjipl)isssl GEderiR@

d6cksted reliabiEty'targat(iij@siposse jto t!i[ Static (UlaWout RofMlO,C 15 o

16 provide a baseline for testing and surveillance activities of some SSCs under the scope of 17 the Maintenance Rule. Additional testing and surveillance ac:ivities could be necessary 18 if SSC performance is unacceptable. The Maintenance Rule results could also provide 19 the basis for reduced testing and surveillance. The basis for technical specification, 20 licensing commitments, and other regulation rnay be appropriately used for goal setting.

21 Typical examples of such regulations or licensee commitments ir.clude:

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1. Surseillance test and inspections performed in accordance with Section XI of 24 the ASME code as required by 10 CFR 50.55a.

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2. Reactor pressure vessel material surveillance tests conducted in accordance 27 with Appendix H of 10 CFR Part 50.

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3. Containment leakage tests performed in accordance with Appendix J of 10 30 CFR Part 50.

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4. Component surveillance or testing required by plant technical specifications.

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5. Fire protection equipment tested and maintained in accordance with 35 Appendix R of 10 CFR Part 50.

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6. Tests and inspections performed in response to NRC bulletins, generic letters, 38 or information notices.

39 40 9.4.1 Coal Setting 41 42 Goals can be set at the structure, systern, train, or component level, and for 43 aggregates of these where appropriate. In some cases the utility may clect to establish thresholds which would provide indication ofimproved performance toward the ultimate 44 - -.

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23 12.2.4 Optimizing Availability and Reliability for SSCs

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24 25 For risk significant SSCs adjustments shall be made, where necessary, to 26 maintenance activities to ensure that the objective of preventing failurcs is appropriately 27 balanced against the objective of assuring acceptable SSC availability. For BjidfdiiB) 28 non-risk significant SSCs, it is acceptable to measure SSC performance against overall 29 plant performance criteria idid fp}istEdhj3yjfdiisNzipshielper(sisianbQsir$t l

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31 32 The intent is to optimize availability and reliability of the safety functions by 33 properly managing the occurrence of SSCs being out of service for preventive 34 maintenance :1ctivitics. This optimization could be achieved by any of the following:

35 Enstiring that appropriate preventive maintenance is performed to meet 36 37 availability objectives as stated in plant risk analysis, FSAR, or other reliability 38 approaches to maintenance; 39 Allocating preventive maintenance to applicable tasks commensunte with 40 41 anticipated performance improvement (e.g., pump vibration analysis instead of 42 teardown);

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Reviewing to determine that availability of SSCs has been ricceptable; t i

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. Focusing maintenance resources on preventing those failure modes that affect 2

a safety function ; or 3

Scheduling, as necessary, the amount, type, or frequency of preventive 4

5 maintenance to appropriately limit the time out of service.

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