ML19317H008

Forwards Sample Surveillance Tech Specs Re PWR Hpis & LPIS Sys Throttle Valve Stops in Determining Use of Throttle Valves to Obtain Required Flow Distribution in HPSI or LPIS

ML19317H008
Person / Time
Site:	Rancho Seco
Issue date:	07/18/1977
From:	Reid R Office of Nuclear Reactor Regulation
To:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
Shared Package
ML19317H009	List: ML19317H008 ML19317H015
References
NUDOCS 8004020686
Download: ML19317H008 (3)

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M 1819U DIST.UBUTION:

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Decket No.: 50-3 L PDR

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RWReid RInaram p:7 7 5 Sacramento Municipal Utility District L01shan

- J:g:l ATTN: Mr. J. J. Mattimore JWetmore.

Assistant General Mahager Attorney, OELD p....

and Chief Engineer 0I&E(3) 6201 S Street DEisenhut P. O. Cox 15830 TBAbernathy

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Sacramento, California 95813 JRBuchanan

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h=i Gentiemen:

TCarter Gray file g==

RE: RANCHO SECO HUCLEAR GENERATING STATION

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=EM A large number of PWR High Pressure and Low Pressure Safety Injection

=s Systens (HPSI and LPSI) utilize a com

on low pressure and a coanon high lJ ~.6~

pressure header to feed the several cold (and in so:ne cases hot) leg y

injection points. Maintenance of prcper flow resistance and pressure Fc=EE:

drop in the piping system to each injection point is necessary to:

M BE (1) prevent total pump flow fro:n exceeding runout conditions when the h

system is in its minimum resistance configuration; (2) provide a proper flow split between injection points in acccrdance with the

~F assumptions used in the ECCS-LOCA analyses, and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that asse'ed in the ECCS-LOCA analyses. Many plants have either manual or E~

notor operated valve (s) in the lines to each injection point that have

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clectrical or mechanical stops which have been adjusted during pre-E operational testing of the plant to ensure that these flow recuirements h,=gg E

are satisified.

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In view of the safety function associated with the proper setting of valves used to throttle flow in these systems, we consider it appropriate that periodic verification be made of these valve positions. Accordingly, F

we recuest that you determine if throttle valves are used to obtain the

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re. quired flow distribution in the HPSI or LPSI systems.

If throttle valves are used, we request tnat you propose changes to your technical specificaticns to incorporate the surveillance recuirements given in the enclosure.

In the event valves are not utilized to throttle flow in your systems, r

you snould advise us of this fact and no f9rther action will be required.

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The above action should be completed sithin 60 days of receipt of

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this letter.

In the event you should desire further discussion of,,

this matter, please contact us.

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Sincerely, l}"qEj

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Robert W. Reid, Chief F

Operating Reactors Branch #4 l.

Division of Operating Reactors i::

Enclosure:

Technical Specifications-E=m-cc w/ enclosure:

r.:.EE Sce next page

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Sacram:nto fiUnicipal Utility District

$f David S. Kaplan, Secretary and

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General Counsel

=ih 6201 S Street Post Office Box 15830 idy;g; Sacramento, California 95813

-my Business and Municipal Department Sacramento City-County Library 82S I Street Sacramento, California 95814

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