ML20037B549

Informs That NRC Is Continuing Review of ECCS Performance. Util 760831,1020 & 1117 Replies to NRC 760426 Request for Addl Info Did Not Include Complete & Statistical Answer to Question 4.Schedule for Response Requested within 30 Days

ML20037B549
Person / Time
Site:	Dresden
Issue date:	12/08/1976
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	Bolger R COMMONWEALTH EDISON CO.
Shared Package
ML20037B550	List: ML20037B549 ML20037B551 ML20037B552
References
NUDOCS 8010170713
Download: ML20037B549 (2)

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DISTRIBtJTION Docket T

ORB #2 Reading NRC PDR p.

Loca1 PDR g :;;;:.s ORB #2 Reading I

Docket :to. 50-10 VStello i+

DEC 8'1976 KRGo11er F

P:

TJCarter s.:

0 ELD Co rionwealth Edison Company.

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~ATT!!:

i'.r. R. L. Bolger MGrotenhuis P

Assistant Vice President RWoods f

Post Office Eox 767 RMDiggs E

Chicaco, Illinois 60GM DEisenhut b4 TBAbernathy Gentlemn:

JRBuchanan k

i DRESDE1 !!!! CLEF.n. p0'1ER STATIO!8 ti!!IT l10.1 ECNNb P.E:

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Uc are continuino our review of the Dresden Unit No.1 ECCS performance p:

uith respect to the requirerents of 10 CFR Part 50.46.

Your August 31,

!5 1976, October 20, 1976, and !'ovenber 17, 1976 replies to our April 26,197C request for additional infornation did not include a conplete an1 satis-factory answer to Question 4 of Enclosure A.

ascent data uhich has become available to the General Electric Company is

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sumari;:ed in the attached neeting minutes.

In the light of this recent c'ata, justify your assuned spray coefficients in regard to effects on t....-.._

spray distribution due to steam environment, pressure and updraft. Also F

consider the minimum spray flou present in APED-4927 and APED a928 tests (or any other test data you chocse to reference in support of your assumed spray cooling coefficients).

Please provide within 30 days your

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schedule for a complete response, including description of any tests you nir:ht propose to obtain data applicable to your plant.

Sincerely, M signed by p k Ziemann Dennis L. Zienann, Chief Cperatinq Reactors Branch #2 E

Division of Operating Reactors

Enclosure:

d As stated above CC:

,_E See next page 80101707/3 s

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DEC 8 1976 1..' ~.

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Hr. John W. Rowe E!EW Ishan, Lincoln & Beale w

Counselors at Law One First National Plaza, 42nd Floor Mjg[3

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Chicago, Illinois 60603

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