ML20155E343

Responds to NRC Bulletin 88-004, Potential Safety-Related Pump Loss. Demineralized Water Transfer Sys Has Potential for dead-heading of One Pump,But Sys Not safety-related.No Actions Planned in Response to Bulletin

ML20155E343
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	06/06/1988
From:	Taylor J DAIRYLAND POWER COOPERATIVE
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-004, IEB-88-4, LAC-12564, NUDOCS 8806160065
Download: ML20155E343 (2)

Text

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D ^ DAIRYLAND kh[S/[COOPERATlVE 2615 EAST AVE SO

• PO. BOX 817 t ACROS (608) 788-4000 JAMES W. TAYLOR Gsnoral Manager June 6, 1988 In reply, please refer to LAC-12564 DOCKET No. 50-409 Document Control Desk U. S. Nuclear Regulatory Washington, DC 10555 Gentlemen:

SUBJECT:

Dairyland Power Cooperative La Crosse Boiling Water Reactor (LACBWR)

Provisional License No. DPR-45 NRC Bullutin No. 88 Potential Safety-Related Pump Loss ,

REFERENCE:

(1) NRC Letter, Charles E. Rossi, to All Holders of Operating Licenses or Construction Permits for Nuclear Power Reactors. (8804290177)

The purpose of this bulletin, as stated in Reference 1, is to request that all licensees investigate and correct as applicable two miniflow design concerns. "The first concern involves the potential for the dead-heading of one or more pumps in safety-related systems that have a minific,w line common to two or more pumps or other piping configurations that do not preclude pump-to pump interaction during miniflow operation. A second concern is whether or not the installed miniflow capacity is adequate for even a single pump in operation."

The only operating system installed at this facility thac has a common discharge header with a recirculation line and two pumps installed anc could therefore result in dead-heading of one pump, should both pumps be running at the same time, is the Demineralized Water Transfer System. The Demineralized Water Transfer Pumps are 40 gpm centrifugal pumps, powered by 7.5 hp motors, one of which is in continuous operation to maintain demineralized water header pressure. A small amount of recirculation is provided through a 1/2-inch line back to the Virgin Water Tank to prevent dead-heading of the pump. If both pumps were running under low flow conditions, pump-to pump interaction will -

cause the weaker pump to dead-head. This system has operated satisfactorily for approximately twenty years.

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PDR ADOCK 05000409

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Document Control Desk LAC-12564 l Pabe 2' June 6, 1988 The. Demineralized Water Transfer System is not considered a safety-related system, therefore, no actions are planned in response to this bulletin.

If you have any questions regarding this reply, please contact us.

Sincerely,i .

DAIRYLAND POWER COOPERATIVE M

L James 5!. Taylor Genetal Manager JWT:GSB:sks cc. Mr. A. Bert Davis, Regional Administrator U. S. Nuclear Regulatory Commission, Region III

-Glen Ellyn, IL 60137 Mr. Peter B. Erickson, LACBWR Project Manager Division of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mr. Ken Ridgway, NRC Resident Inspector STATE OF WISCONSIN )

)

COUNTY OF LA CROSSE )

Personally came before me this day of _

/* , 1988, the above named, James W. Taylor, to me known to befthe person who executed the foregoing instrument and acknowledge the same. L/

&,k Notary Public, La Crosse C~inty Wisconsin My commission expires February 23, 1992.

PCI-50

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