ML20207B633

Requests Determination If Throttle Valves Are Used to Obtain Required Flow Distribution in HPSI or LPSI Sys.If Throttle Valves Used,Tech Specs Should Be Changed within 60 Days to Incorporate Encl Surveillance Requirements

ML20207B633
Person / Time
Site:	Davis Besse
Issue date:	11/09/1977
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Roe L TOLEDO EDISON CO.
References
TAC-08164, TAC-8164, NUDOCS 8612150495
Download: ML20207B633 (5)

Text

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ya MS Docket File R. H. Vollmer NRC PDR M. L. Ernst Local PDR. W. P. Gamill n0V 3 $7 LWR 1 File ELD l

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R. C. DeYoun9 V. Stello D. B. Vassallo K. Goller F. J. WiHiams G. lear Docket No. 50-346 Z W. Raass E. Hylton Mattson Toledo Edison Coupany [* hs ATTH: Mr. Lowell E. Roe ,

J. Knight bcc: JRBuchanan, NSIC Vice President Facilities R. Tedesco TBAbernathy, TIC p nt H. Denton ACRS (16)

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300 Madison Avenue Toledo, Ohio 43652 Gentlemen: .

RE: DAVIS-BESSE UNIT NO. 1 A large number of PWR High Pressure and Lcw Pressure Safety Injection Systec:s (HPSI and LPSI) utilize a ccenon low pressure and a common high pmssure header to feed the several cold (and in some cases hot) leg O injection points. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to:

(1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration; (2) provide a proper flow split betucen injection points in accordance with the 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 assumed in the ECCS-LOCA analyres. Many plants have either manual or motor operated valve (s) in the lines to each injection point that have electrical or mechanical steps which have been adjusted during pre-operational testing of the plant to ensure that these flow requirements' are satisfied.

In view of the safety function associated with the proper setting cf valves used to throttle flow in these systems, we consider it appropriate that periodic verification be made of these valve positions. Accordingly, we request that you determine if throttle valves are used to obtain the required flow distribution in the HPSI or LPSI systems. If throttle valves are used, we request that you propose changes to your technical specifications to incorporate the surveillance requirements given in the enclosure.

In the event valves are not utilized to throttle flew in your systems, you should advise us of this fact and no further action will be required.

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2- NOV 9 1977 The above action should be completed within 60 days of receipt of this letter. In the event you should desire further discussion of this matter, please contact us.

Sincerely.

-' Original Signed by

,' John F. Stols t Jchn F. Stolz, Chief Light tlater Reactors Branch flo.1 Division of Project fianagement

Enclosure:

- Technical Specifications cc w/ enclosures:

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.r Toledo Edison Company NOV S 1977 cc: Donald H. Hauser, Esquire The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 Gerald Charnoff, Esquiro Shaw, Pittman. Potts and Trowbridge 1800 H Street. N. W.

Washington, D. C. 20036 Leslie Henry, Esquire 4 Fuller, Seney, Henry and Hodge 300 Madison Avenue Toledo, Ohio 43604 OFFIC E W SUR AME &

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P SAFPLE SURVEILLANCE TECHNICAL SPECIFICATIONS FOR I

PWR HPSI AND LPSI SYSTEM THROTTLE VALVE STOPS

1. The correct position of each electrical and/or mechanical position stop for the following throttle valves shall be verified;

a. Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following completion of each valve stroking operation or maintenance on the valve when the HPSI or LPSI System is required to be operable.

b. At least once per 18 months.

HPSI System LPSI System Valve Number Valve Number g{

1. ,

1.

2. 2.

3. 3.

4. 4.

5. S.

2. A flow balance test shall be performed during shutdown to confirm the following minimum injection flow rates following conoletion of HPSI or LPSI system modifications that alter system flow characteristics:

HPSI System - Single Pump LPSI System - Single Pump Injection Leg ____ t __ gpm Injection Leg [ gpm Injection Leg 1 gpm Injection Leg [ gpm Injection Leg 1 __ gpm Injection Leg t gpm Injection Leg 1 __ gpm Injection Leg [ gpm Bases The purpose of these surveillance requirements is to provide assurance that proper ECCS flows will be maintained in the event of a LOCA. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to: (1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in accordance with the 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 assumed in the ECCS-LOCA analyses.

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