ML18046B005
| ML18046B005 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/27/1981 |
| From: | Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8110300419 | |
| Download: ML18046B005 (3) | |
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consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (517) 788-0550 October 27, 1981 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission*
Washington, DC 20555 DOCKET 50-255 - LICENSE DPR-20
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PALISADES PLANT - UPDATE OF INSERVICE PUMP TESTING PROGRAM Consumers Power Company Palisades Plant is updating its inservice pump testing program to comply with requirements of the ASME B & PV Code,Section XI; 1977 edition with Addenda through Summer 1979.
This is done in accordance with 10 CFR 50.55a.
Pursuant to 10 CFR 50.55a (g) and the Palisades Technical Specifications, the relief request from certain code items is the same as the one submitted by Consumers Power Company April 25, 1980.
A copy of this request is provided for your information as Attachment 1.
Brian D Johnson Senior Licensing Engineer CC JGKeppler, USNRC NRC Resident Inspector - Palisades Attachment
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\\I ATTACHMENT I SERVICE TESTING OF PUHPS REQUESTS FOR EXEr-IPTIONS TO SECT XI 77S78
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In general, instrumentation is not available to measure both flow and discharge pressure of the pumps included in the test program.
Previous Code editions allowed measurement of either flow or differential pressure on pumps in fixed-resistance syste::r.s, but the 1977 ec'iition now requires both to be roeasured.
For systems in which the test flow path configurations are duplicated (i.e., system resistance essentially constant), both flow anc differential pressure are responsive to pump hydraulic performance, and therefore, either parameter will give adequate information to verify accep-table pump operation.
For monthly tests of pumps in systems which have essentially fixed operat-ing configurations and flow resistance characteristics, therefore, either flow or pressure, but not necessarily both, will continue to be monitored.
This approach is adequate to allow early detection and correction of de-grading pump performance.
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In the case of the service water system, ~here is no installed flow instru-mentation.
This system can not be considered a fixed resistance system, however, in that pump flows will vary because of numerous temperature control valves which automatically change flows to supplied components.
Since the system heat loads during normal plant operation are es~entially constant, pump flows and the resulting discharge pressures can be consider-ed as functions of Lake Michigan water temperature.
On this basis, a graph of expected pump discharge pressures vs Lake temperature was develo~
ed using approximately three years operating data (see attachment), and this graph, in turn, has been used as the basis for the pump discharge pressure acceptance criteria as allowed by Article lWP-3210 of the Cede.
In the 2 1/2 years this graph has been used, it has shown itself to predict the pump pressures with reasonable accuracy.
In addition, the flow requirement for service water during normal plant Operation, per the FSAR, is almost identical to the flow required following an MHA (14,275 gpm vs 14,330 gpn).
Therefore.,. the abi)ity of the service water pumps to. handle cooling* r*equirements during normal operation is, El itself, continuous confirmation of the ability of the system to handle the peak heat load following an MHA.
Therefore, for the monthly service water pump tests, a graph of expected pump performance based on historical data will continue to be used to monitor the performance of the pumps.
This method is adequate to allow early detection and correction of degrading service water pump performance.
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