ML19344E598
| ML19344E598 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/15/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8009020322 | |
| Download: ML19344E598 (4) | |
Text
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MW0m'sDCi'E IM CR Docket No. 50-313 August 15, 1980 Mr. William Cavanaugh -III Vice President, Generation and Construction Arkansas Power and Light Company P.O. Box 551 Little Rock, Arkansas 72203
Dear Mr. Cavanaugh:
Subject:
IREP Schedule J
At our meeting on August 4 we promised to send you an outline of the IREP schedule for the first 5 months annotated to highlight the skills and knowledge that could best be provided by your representative (s) on the IREP team.
The anticipated start date is September 15, 1980. The following discussion refers to the IREP Procedure and Schedule Guide, to nly letter of. July 25, 1980.
First 2 weeks - First cut rt tasks 1-5, late September.
The team will be familiarizing itself with the plant documentation and perfoming the first few tasks in the IREP Procedure and Schedule Guide. We anticipate l.
a number of document requests to be made from the procedure index or diagram index. Someone thoroughly familiar with the plant design and operations documentation would help the team to be selective and to request the appropriate documents.
Third through eighth week '- First cut at tasks 6-17, October and early November.
The team will be classifying initiating events, developing the catalogs of accident scenarios in broad outline (event tree analysis),
defining system success vs. failure criteria, and tracing the possible causes of the initiating events to faults in the support systems which i
also serve the required mitigating systems. During this phase, the assistance of an individual who has a broad understanding of accident processes, systems design, # operation would be particularly valuable.
We have not requested the voluminous plant design documentation on power generation equipment that may prove to be necessary to perfonn the fault tree analyses of transient initiators and non-passive failure LOCAs.
Therefore, we will probably assign to the more knowledgeable owner's representative the lead responsibility for the development of the fault trees-for the initiating events. He will also be expected to partici-pate in each of the other tasks: event tree analysis, definition of the i
system success vs. failure criteria, etc.
.8009020$2R
,,,.p Mr. William Cavanaugh, III August 15, 1980 Ninth through sixteenth week - First cut at tasks 18-27, late November through January.
This phase of the study will focus on fleshing out the reliability-predictive models of the systems (fault tree analysis).
The visit to the plant by the team will occur late in the prior phase or early in this phase. We anticipate that the early work in this phase will concentrate on the relatively straight-fomard front line engineered safety features.
In the later phase the work will move to the modeling of the network of suppcrt systems. We expect a progressively growing need for owner's representative assistance to the team within this interval in the centexts of (1) surveillance M cintenance practices, (2) operating and emergency procedures, and (3) control and instrumentation.
Sixteenth through twentieth week - First cut at tasks 28-35, February.
The initial screening of accident scenarios according to likelihood and the search for not-yet-identified common cause failure modes will take place in this interval.
Particularly useful knowledge and skills in your representatives will be in the areas of possible operator corrective action in the face of multiple failures, control and instrumentation, and procedures.
In this and successive phases the team will be refining their models of the potentially dominant accident scenarios. The questions the team will need to ask of your personnel will be more sharply focused. The physical presence on the team of the more knowledgeable and valuable personnel will be less important than in the fomative second phase (weeks.2-8).
You will, however, want to keep your more senior people in engineering and operations apprised of the emerging picture of the dominant accident sequences. You may want to intersperse the occasional management briefings with more frequent technical briefings during the last few months of the program.
From our point of view, we would prefer as much continuity, knowledge, and skill as we can get in your participants. We do understand, though, that your better people are in great demand.
If I were in your shoes and could manage it, I would assign a junior systems and licensing engineer or systems reliability engineer to stay with the IREP team throughout.
He or she would be in it for the experience, for liaison, and to take a prominent role in the digestion and use of the results at the conclusion of the IREP study.
He or she might be earmarked to exercise and keep the IREP models updated after the NRC study is complete, as Florida Power Corporation is planning to do.
I would select that person for imagination, sound abstract thinking or broad overview, and at least a passing familiarity with mechanical, electrical and control systems engineering. That person should also have the facility with mathematics to rapidly learn probabilistic system reliability analysis while on the team.
In addition to this continuous presence on the IREP team, I would assign a couple of others for temporary assignment to IREP.
I would pick the most knowledgeable individual I could pry loose in plant operatior and engineering for the 6 week second phase period
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-!:r. !!illian Cavanaugh, III.. AUG 15 lE in October and f;ovenbar (cvent trees,.systm success critoria, and the analysis of initiating events).
I wuld try to camark 1 day per week of-this sano person's tine fron February through the conclusion of the study.- while he or she remains at their non al post - to review the convergence on results. A third person, chosen for familiarity with control and instrumentation, naintenance procedures and encreency procedures muld be detailcd to IREP in January and February (late in the systm. )
reliability nodeling phase and the subsequent probabilistic cyaluations to' assure that the rodeling of the netwrk of support systens is dond correctly,'to participate in the evaluation of.cquirrent unavailabii nty duo to test and naintenance, and to assist in rodeling the possibilities for operator corrective action during accidents. That person, too, I would assign.to part tino review of IREP results after their return to r.omal assignnent in !! arch. To nake sure that Ferson can get up to speed pro.~ptly when he or she joins the tecn in January, that person should have attended.- as a nininun - an engineering sfort course in protabilistic systen reliability analysis or fault tree analysis.
This representation, one person full tino and tuo rare highly-qualified people for 6 unck assignacnts should nect our nutual need to assure thct the radels produccd in IPEP fairly portray your plant and offer 30ur people considerable experience in probabilistic safety analysis uithout
'indaly burdening your already hard pressed staff, or so we believe.
I
.. ope that this helps you in Jour planning for IREP participation.
Sincerely, Original signed by Darrell G. Eicc:dnit Darrcll C. Eiseqhut, Director Division of Licensing Office of f:uclear Fcactor Regulati:,n cc:
See I,ttached. List bec:
Docket File-NRC Public. Document Room G. Vissing R. !iattson M..Ernst S. -Israel F. P.ousome
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Arkansas Power & Light Company cc:
Mr. Robert Szalay, Licensing and Mr. David C. Trimble Safety Project Manager Manager, Licensing Atomic Industrial Forum Arkansas Power & Light CompaRY 7101 Wisconsin Avenue P. D. Box 551 Little Rock, Arkansas 72203 Washington, DC 20014 Mr. James P. O'Hanlon Mr. E. P. O'Donnell General Manager
.Ebasco Services. Inc.
Arkansas Nuclear One 89th Floor P. O. Box 608 2 World Trade Center Russellville, Arkansas 72801 New York, NY 10048 Mr. William Johnson U. S. Nuclear Regulatory Commission Dr. Edwin Zebroski P. O. Box 2090 Nuclear Safety Analysis Center Russellville, Arkansas 72801 3412 Hillview Avenue P. O. Box 10412 Mr. Robert B. Borsum Palo Alto, CA 94303 Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Mr. Nick Reynolds DeBevoise & Libernan 120017th Street, NW Washington, D.C.
20036 Arkansas Polytechnic College l
Russellville, Arkansas 72801 Director, Bureau oi Environmental Health Services 4815 West Markham Street.
Little Rock, Arkansas 72201 Mr. Paul F. Levy, Director Arkansas Department of Energy 3000 Kavanaugh Little Rock, Arkansas 72205 Mr. William T. Craddock, Mgr.
Availability Engineering j
First National Bank Building P. D. Box 551, Seventh Floor Little Rock, Arkansas 72203
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