ML19309A673

Responds to NRC 750513 Request for Feedwater Sys Stability Study.Discusses B&W Once Through Steam Generators Used at Facility.Response to Items Applicable to Facility Will Be Forwarded within 60 Days

ML19309A673
Person / Time
Site:	Rancho Seco
Issue date:	05/22/1975
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Purple R US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8003310645
Download: ML19309A673 (3)

Text

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NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL

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CONTROL NO: 5730

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FILE:

FROM: SWD DATE OF DOC DATE REC'D LTR TWX RPT OTHER Sacramento, Calif 3.J. Mattinoe 5-22-75 5-27-75 xxx

'TO:

ORIG CC OTHER SENT AEC POR vvv Mr. Robert A. Purple y

1-signed SENT LOCAL PDRxxxx

. CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

xxxx 30 50-312 DESCRIPTION:

ENCLOSURES:

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Ltr ref our 5-13-75 Itr....'trans'the fo116 wins,: Figure 4.2-5 Steam Generatot..

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PLANT NAME:

W Rancho Seco BUTLER (L)

FOR ACT!ON/INFORMATION 5-28-75 JGB i

SCHWENCER (L) ZIEMANN (L)

REG AN (E) 1 W/ Copies W/ Copics W/ Copies W/ Copies CLARK (L)

STOLZ (L)

DICKER (E)

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SALTZMAN GOSSICK/ STAFF KNIGHT KASTNE R E. GOULBOURNE (L)

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GIAMOUSSO SHAO SPANGL ER J. LEE (L)

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CHAPMAN DEYOUNG (L)

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IPPOLITO KNIGHTON M. SLATER (E)

PETERSON P. CO L LINS TEDESCO YOUNGBLOOD H. SMITH (L)

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KLECKER WEG OPR LAINAS ROJECT LDR G. WILLI AMS (E)

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$SMun SACRAMENTO MUNICIPAL UTlUTY DISTRICT O 6201 S Street, Box 15830, Sacramento, California 95813: (916) 452-3211 May 22, 1975

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Mr. Robert A. Purple, Chief A

Operating Reactors Branch #1 y'

Division of Reactor Licensing r

U. S. Nuclear Regulatory Commission b

I*9-Washington, D. C.

20555 U

Docket No. 50-312 Rancho Seco Nuclear Generating s

Station, Unit No.1

Dear Mr. Purple:

Please refer to your letter of May 13, 1975 wherein you requested a feedwater system stability study.

Rancho Seco Unit No.1 uses Babcock & Wilcox once through steam generators.

In this design the feedwater nozzles are located approximately at the mid-plane of the steam generator and the water level is maintained below the feedwater nozzles throughout the entire operating range.

The attached sketch shows the relationship between the steam generator water level and feedwater nozzles.

Since the feedwater nozzles are not submerged, Rancho Seco Unit No.1 is not susceptible to the type of occurrence experienced with systems using a submerged feedwater nozzle design.

We will, however, respond within sixty days to those items of your May 13, 1975 letter which may be applicable to Rancho Seco Unit No. 1.

Sincerely yours, ACx J. J. Mattimoe Assistant General Manager and Chief Engineer Attachment

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