ML19332B612

Provides Individual Plant Exam Method & Schedule.Completion of Level 1 PRA Scheduled for Jul 1991.Containment Performance Analysis Will Be Completed in Feb 1992.Results Will Be Provided in Sept 1992

ML19332B612
Person / Time
Site:	Callaway
Issue date:	10/31/1989
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ULNRC-2099, NUDOCS 8911070391
Download: ML19332B612 (5)

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Cetober 31, 1989

-U.S'.1 N uclear Regulatory Commission ATTN: Document. Control Desk *

- Mail Station-P1-137 ULNRC- 2099 -!

Washington, D.C. 20555 ,

> . Gentlemen:

DOCKET NUMBER 50-403 CALLAWAY PLANT INDIVIDUAL PLANT EXAMINATION METHOD AND SCHEDULE '

References:

1.) NRC Generic Letter _88-20, dated 11/23/88 .

2.).NRC Generic' Letter 88-20, Supplement l',

l' dated 8/29/89 3.).54FR36402, dated 9/1/89 4.) NUREG-1335, " Individual Plant 6

Examination: Submittal Guidance" 5.) ULNRC-1943, " Comments on Draft NUREG-1335", dated 3/17/89

• In accordance with-References.1-4, Union Electric will perform a Level'l PRA and a containment performance method 1 of._ item 4 of Reference-1) for analysis.(i.e.,The examination wil1~ make-use of current Callaway.

Level 1 PRA techniques, as generally described in The containment performance References 1 and 4. ,

analysis will-follow the guidance given in Appendix 1 of J Reference 1 and. Appendix A of Reference 4. MAAP 3.Ob

? will be used to assess the phenomena associated with

' postulated severe accident transients.

Our schedule for performing the IPE is as follows:

!- Completion of Level 1 analysis: July, 1991 l# 't

• Completion of containment performance (back-end). M

( analysis: February, 1992

-n September, 1992

• Submittal of results to the NRC:

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~ As~ discussed'in Reference 4,-a new design verification effort 'is- not: needed for confirmation 'that our Our

' IPE represents the.as-built, as-operated plant.

extensive design-control, configuration control, and document control programs will ensure that drawings and procedures used in the IPE reflect the. current-design and operating. philosoph;' of the plant. Design modifications and procedure changes occurring prior to sequence.quantification will be factored into the IPE submittal. The review process to be employed, discussed below, will also confirm that our IPE reflects the as-built, as-operated plant. As such, plant walkdowns will be limited to general plant familiarization and to those cases where as-built drawings may not be sufficient for the particular issue under consideration.

Walkdowns may be beneficial in addressing spatial and geometry issues associated with the internal flooding analysis, system dependencies and spatial systems interactions, and certain back-end phenomenological mechanisms. Such walkdowns are planned, and will be performed on an as-needed basis.

Regarding the Callaway IPE review process, all documentation packages will receive a peer review by an I individual who is involved in the IPE. This same review process is applied to assure the quality of all safety-related calculations. Independent, in-house -l j

L reviews will be performed on selected IPE task .!

documentation packages, as these packages are completed. l For example,-event tree documentation packages will be  !

l p reviewed by Operations Dept, personnel to ensure that the event trees accurately reflect the potential j l

1 sequences of events following the occurrence of an ~!

accident initiator. Our IPE consultant will also' review 4

i all documentation packages. In addition, Union Electric l

l and Wolf Creek Nuclear' Operating Corporation will ,

L exchange and review documentation packages for the l

~ purpose of insuring that no potential vulnerabilities are overlooked. Callaway and Wolf Creek were designed, i

l' purchased and licensed under the Standard Nuclear Unit L

Power Plant ~ System (SNUPPS) concept and remain similar in design and operating philosophy. After the IPE-is completed, Union Electric intends to hold a training course to acquaint Operations, Engineering and other plant staff with the IPE process, results and potential future applications. Union Electric does not plan, however, to train a team of personnel, not involved in performing the IPE, to independently review the entire IPE.

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-f Based on the' review process and. training. course-

. described:above, Union 1E3ectric believes,that the intent =  !

of--the requested independent, in-house review will be t

met, while prudently dedicating resources to the:IPE.

Very truly;yours, l

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Donald F. Schnell-1 1

KGC/GGY/ dis 8

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STATE OF MISSOURI )

) SS CITY OF ST. LOUIS )

Donald F. Schnell, of lawful age, being first duly. sworn upon oath says that he is Senior Vice President-Nuclear and an officer of Union Electric Company; _that he has-read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power'and authority to do so; and-that the facts therein stated are true and correct to the best of his knowledge, information and belief.

By v I- Donald F. Schnell 1 i-Senior Vice President- l Nuclear SUBSCRIBED and sworn to before me this E d day of dcu, 1989 l

-l 4 BARDARA PFAFk M h0TARY FUBUC, STATE OF MISSOURI Mt COMMISSION EXPIRES AFRIL 22, 1993 ST. LOUIS COUNTY l

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Shaw, Pittman, Potts & Trowbridge

'2300-N. Street, N.W. -

Washington,.D.C. -20037

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. Dr . J.13. Cermak -

CFA', - I nc .

4 Professional Drive. (Suite 110)

• Gaithersburg, MD 20879

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R. C. Knop  !

Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III h 799-Roosevelt Road Glen Ellyn,' Illinois 60137  :

Bruce'Little Callaway Resident Office U.S. Nuclear Regulatory Commission RRil' Steedman, Missouri 65077 Tom Alexion (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission

• l White-Flint, North, Mail Stop 13E21 11555 Rockville Pike Rockville. MD 20852 Manager, Electric Department Missouri Public Service Commission Jefferson City, MO 65102 Dave Modeen j Nuclear Management and Resources Council 1776 Eye St., N.W.

l Suite 300

/ Washington, D.C. 20006-2496 l-l l

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