JPN-88-059, Informs That Util Has Completed Hydraulic Calculations of Existing Miniflow Configuration for RHR Pumps,Per NRC Bulletin 88-004.Parallel Pump Interaction Not Applicable to RHR Sys & Calculated Miniflow Values Verified W/Pump Mfg

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Informs That Util Has Completed Hydraulic Calculations of Existing Miniflow Configuration for RHR Pumps,Per NRC Bulletin 88-004.Parallel Pump Interaction Not Applicable to RHR Sys & Calculated Miniflow Values Verified W/Pump Mfg
ML20206A477
Person / Time
Site: FitzPatrick Constellation icon.png
Issue date: 11/09/1988
From: Brons J
POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-004, IEB-88-4, JPN-88-059, JPN-88-59, NUDOCS 8811150141
Download: ML20206A477 (2)


Text

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M [ John C. Brone N r a a November 9, 1988 JPN-88-059 U. S. Nuclear Regulatory Commission Mail Station Pl-137 Washington, D.C. 20555 Attnt Document Control Desk

Subject:

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 NRC Bu)1etin 88-04, "Potential Safety-Related Pump LCuas"- l

References:

1. NRC Bulletin 88-04, "Potential Safety-Related Pump Loss", dated May 5, 1988.
2. NYPA letter J.C. Brons to NRC, dated July 22, 1988 (JpN-88-036), same subject.

Dear Sir:

In Bulletin 88-04 (Reference 1), the NRC asked licensees to investigate the potential for dead-heading one or more pumps in safety-related systems. The systems requiring evaluation utilize a common miniflow line for two or more pumps which may not preclude pump-to-pump interaction.

Licensees also had to verify the adequacy of miniflow line for  !

single pump operation.

In response to the Bulletin, the Authority performed a l preliminary review of all safety related systems to identify the parallel pumps which use a common miniflow line. This i review indicated that the only system which utilizes parallel pumps with a common miniflow line is the Residual Heat Removal l (RHR) System. As discussed in Reference 2, pump interaction during miniflow operation for this system is extremely unlikely. However, the Authority committed to perform hydraulic calculations to confirm the conclusion of the -

preliminary review.

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The Authority haa completed hydraulic calculations of the existing miniflow ccafiguration for the RHR pumps. These calculations indicate that a maximum pressure of 11 psi will exist downstream of the miniflow orifice. Thic pressure is significar.tly lower than the pump operating pressure of 240 psi at miniflow conditions. Tharefore, parallel pump interaction is not applicable to this installation. The Authority also contacted the pump manufacturer, Byron Jackson, and verified the adequacy of the calculated miniflow values. This verification confirms that the calculated miniflow capacity exceeds the required flowrate by 11 percent.

The Authority will verify the as-built size of the RHR miniflow orifices at the next available opportunity. For the remaining pumps, the result of analysis as outlined in Reference 2 will be provided by January 28, 1989 Should you or your staff have any questions regarding this matter, please contact Mr. J. A. Gray, Jr. of my staf*.

Very truly yours,

@(

s 1 hn C. Brons

/ Executive Vice President luclear Generatien cc: U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of P'.dsia, PA 19406 office of the Resident Inspector U. S. Nuclear Regulatory ccmmission P. O. Box 136 Lycoming, New York 1309':

Mr. David E. LaBarge Project Directorate I-1 Division of Resctor Projects - I/II U.S. Nuclear hegulatory Commission Mail Stop 14 B2 Rockville, MD 20852