ML18219D856

Letter Prevention of Feedwater Line Water Hammer by Maintaining Feedwater Piping and Sparger Ring Sufficiently Filled

ML18219D856
Person / Time
Site:	Cook
Issue date:	12/30/1977
From:	Bien F Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Case E Office of Nuclear Reactor Regulation
References
Download: ML18219D856 (6)

Text

~ll DISTRIBUTION AFTER ISSUANCE L PERATING LICENSE NRC FORM 196 Iz 7S)

UM NUCLEAAREGULATORY COMMISSI DOCXET NUMBER

- ZIS TO>>

Mr. Edson G.

Case FROM:

Indiana 8 Michigan Power Co.

F.

N. Bien NRC OISTRIBUTION FDA PART 60 DOCKET MATERIAL FILE NUMBER DATE OF DOCUMENT 12/30 77 DATE RECEIVED 01 04 78

~LETTER ABORIGINAL CICOPY GNOTORIZED

~NCLASSIPIED PROP INPUT FORM NUMBER OP COPIPS RECEIVED i<IC aW DESCRIPTION

Response

to NRCIs 09/02/77 ltr. regarding the prevention of feedwater line water hammer by maintaining the feedwater piping sparger ri,ng sufficiently filled.

Notorized 12/30/77.....

ENCL,OSU AE nd 2p COOK UNIT 0 1 jcm 01/05/78 BRANCH CHIEF:

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INDIANA II MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 December 30, 1977 Donald C.

Cook Nuclear Plant Unit, No.

1 Docket. No. 50-315 DPR.

No.

58 Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

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Dear Mr. Case:

This letter is in response to Mr. Don K. Davis'eptember 2,

1977 letter regarding the prevention of feedwater line water hammer by maintaining the feedwater piping and sparger ring sufficiently filled.

We have in progress detailed analyses of the behavior of the feedwater system both with and without top discharge spargers.

This analysis is described in our response for Unit 2 to Question 010.2 part (c),

Amendment 78.

At this time, we believe that the results of these analyses will show that, with the present feedwater system design and plant operating procedures, any transient conditions will not damage the piping system.

Purther, we do not believe that any potential improvements from top discharge would justify the radiation exposure to the workmen involved in the installation.

The results of the analyses will be available for NRC staff review prior to the start of the Cycle 3 refueling outage for Donald C.

Cook Nuclear Plant, Unit No. l.

To cover the possibility that the analysis will not substantiate our belief, we are proceeding to procure material and will be prepared to install top discharge spargers (J-tubes) in Unit 1 during the refueling outage.

In the event the extended NRC staff review shows "J" tubes to be required for Unit 1, provision will be made to install these tubes during the Cycle 4 refueling outage.

i: s",)k:llJJ)

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I 1

I

Mr. Edison G.

Cas V,

P.

~4 December 30, 1977 Testing of the top discharge configuration will be carried out on Unit 2 as described in our response to Question 010.1 part. (c),

Amendment. 78.

Any future reports of water hammer events will be made in the form of Enclosure 2 to Mr. Davis'etter.

Very truly yours, FNB:dp F.

. Bien Vice President Sworn and subscribed to before me on this/~ay of December, 1977 in New York County New York Notary ubl c

.rsvp> D. Sa.l!:O:1:

Notary Public, SL~',o ol H. o Ycrlc

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Ho. 31-~3341<8 Qualified ln Wovr York Count/

Commission Expires Marcr 30, 19.ZM.

CC G. Charnoff R.J. Vollen R.C. Callen P.W. Steketee R. Walsh R.W. Jurgensen D.V. Shaller Bridgman

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