ML17199F969

Forwards Safety Evaluation Accepting Util 851213 & 31 Review of Electrical Distribution Sys & Related Tech Specs for Compliance W/Gdc 17,App a to 10CFR50.License Amend Allowing cross-tie Between Units for Bus-Tie 24-1/34-13 Under Review

ML17199F969
Person / Time
Site:	Dresden
Issue date:	12/16/1986
From:	Zwolinski J Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
Shared Package
ML17199F970	List: ML17199F969 ML17199F971
References
TAC-60944, TAC-60945, NUDOCS 8701080540
Download: ML17199F969 (2)

Text

December 16, 1986 Docket No~. 50-237/249 DISTRIBUTION __

Mr. Dennis L. Farrar t'DQ_c_ket File J NRC PDR - --

EJordan GHolahan Director of Nuclear Licensina Co1TUT1onwealth Edison Company -

Post*Office Box 767 BGrimes RScholl Chicago, Illinois 60690 Local PDR BWDl Readina RBernero OGC-BETH(Info)

Dear Mr. Farrar:

JZwolinski Dresden File JPartlow NThompson JS tang CJamerson ACRS (10)

GLainas

SUBJECT:

DRESDEN UNITS 2 AND 3 COMPLIANCE WITH GDC-17 (TAC 60944, 60945)

Re:

Dresden Nuclear Power Station, Unit Nos. 2 and 3.

As a result of the August 16, 1985 event at Dresden Unit 2 where the normal supply of offsite AC power was lost, the staff raised questions regarding compliance with 10 CFR Part 50, Appendix A, General Design Criterion (GDC*) 17 for Dresden Units 2 and 3.

By letter dated December 13, 1985 and December 31, 1985 Cormnonwealth Edison Company (CECO) provided a review of the electrical distribution system and related Technical Specifications for Dresden Units 2 and 3 to assess compliance with GDC-17.

Enclosed is the staff's safety evalu-ation. Based on the evaluation the staff finds the Dresden Units 2 and 3 desia~

satisfies the interpretation of GDC 17 in use at the time that the units were -

licensed (1969-1971). Although recently licensed plants have considerable more independence in their required offsite power supplies, based on the staff review of the design and recent operating experience of Dresden Station, we find no obvious problems that warrant consideration of backfit *under 10 CFR 50.109, and do not believe that providing a second full capacity line* will provide a signifi-cant *improvement in the public health and s9fety *.

• Therefore, we consider that the design of the electrical distribution system is in accordance wfth GDC 17.

~ -

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The staff is currently reviewing a lit~~s~ am~ndment to cha~ge ~he Tech~i~al

. Specifications to allow a cross-tie betw~e'n Units *2 and 3 for bus-ti.e 24-1/34-13.

We will.report on the acceptability of the' Technical Specification change in a separate licensing action.

.. : '870108054Cf 861216 t 'I*

PQR

.ADOCK 05000237. *:. *.

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cc w/ enc lOsure:.. _ -

See next.page DBL: BWR#lr*

CJamerson 12/ llP /86 DBL:~#l J~: ac 121 /86 Sincerely,

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Original signed by

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John A: Zworinski,* Dir~c:tor BWR Project Directorate* #1...

Division of BWR:.Li c.ens i ng

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JZwolinski 12/\\ (, /86 Jr--

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'~r. Dennis L. Farrar Commonwealth Edi~on Company cc:.

Mr.. Michael I. Miller Ish~m, Lincoln & Reale Thr~e First National Plaza*

'"Stf'ite '5?-00 Chi ca go, *I 11 i nr.i s 60602 Mr. :lJ. Eenigenburg

• Plant Superintendent Dresden *Nuc1ear Power Station

• . Rural Route #J Morris, _Illinois - 60450

.U. S. Nuclear Regulatory Commission

• Resident Jnspectcr~ Office -

Dresc'en Station,

_ Pural Route.#1

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• Morris; Illinois 604~0 Chairman

' Board of Supervisors of -

Grundy County

. Grun~y County Courthous~

~ Morris, Il 1 ;noi s, 60450. :.

Regional Administrator*

• ~~i1c1earRegulatory Commission,

. 799 Roos eve 1 t Road :

Region II T Glen Ellyn, Ill_inois 60137_'

• Mr: Mich~el.E.. :Parker,* Chief~

Division of Enginee_ring-

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• J1lir1ois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor..

-> Spri ngf i e 1 d, ) 11 i noi s ;62704-Dresder. Nuclear Power Station llnit.s 2 and 3

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