ML19211D164
| ML19211D164 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 12/20/1979 |
| From: | Furr B CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| IEB-79-15, NUDOCS 8001160596 | |
| Download: ML19211D164 (5) | |
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Carolina Powe.,r & Llght Company December 20, 1979
} ((P N.' h : 2 D FILE: NG-3513 (B)
SERIAL: GD-79-3230 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Washington, DC 20555 Attention: Director, Division of Reactor Construction Inspection BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS.1 & 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324 SUPPLEMENTAL RESPONSE TO IE BULLETIN 79-15 Gentlemen:
In our response, Serial Number GD-79-2248, dated September 10, 1979, to your request for information on deep draf t pumps in IE Bulletin 79-15, the Brunswick Steam Electric Plant, through a misinterpretation of the request, did not address the service water pumps.
Carolina Power & Light Company submits the following information on the BSEP service water pumps:
1.
BSEP uses ten deep draf t pumps in its service water system, four on the nuclear and six on the conventional header.
2.
Manufacturer: FMC Corporation, Peerless Pump Division Model: 26 HXB-2 stage, Serial Nos. 338348 through 338357 Capacity: 8,000 gpm, TDH 115 f t, 885 RPM Application: Station Service Water (Nuclear and Conventional) 3.
See Attachment 1 for pump dimensions.
4.
a.
Summary of start-up testing:
Unit No.1:
Preoperational performance test P0-38 completed on March 14, 1975, for 1A &
IB Nuclear Service Water Pumps, and on September 7, 1976, for IA, IB, & IC Conventional Service Water Pumpsi Unit No. 2:
Preoperational Performance Test P0-38 completed on December 23,1974, and PO-38-1 completed on September 23, 1975.
3 411 Fayetteville Street
- P. O. Box 1551 e Raleigh, N. C. 27602 3(1h, 8001160 W
1754 3 h-6 n ctnwu
Director 4-December 20, 1979 f
The preoperational testing provided data for performance analysis in order to determine that the system would perform as designed.
The test also served to check the various interlocks associated with each component, permissives for operation, trip functions, and proper operation of annunciators.
Data compiled during these tests included pump starting and running current and voltage, discharge pressures and temperatures, bearing temperatures, vibration analysis on both pump and motor, pump stuffing box temperatures, and pump flow rates. All tests were deemed acceptable.
b.
Summary of routine maintenance history:
This maintenance consists of vibration monitoring and motor cooler line inspection once per week. Oil levels are checked daily.
- Packing, discharge strainers, and pumps are checked three times per week.
Trouble tickets provide a means of pinpointing problem areas as they arise.
Periodic tests are conducted every 31 days to measure pump suction pressure, discharge pressure, pump flow, pump AP, and pump vibration.
5.
An analysis of all trouble tickets written on the service water pumps reveals that the major operational problems include packing seal leaks, discharge valve repair, motor bearing failure, and n lfunction of the discharge strainers. Major repair erforts include the coating of the stainless steel pump shaft with a chrome oxide ceramic coating sealed with a salt water resistant sealant to reduce abrasive wear. This was applied in the stuffing box only where the packing was presenting a wear problem. The most time-consuming repair is that of the motors. Pumps have been out of service for as long as 14 months while awaiting replacement parts.
Motor failures have been attributed to cooling coil failures of the 90/10 copper nickel coils due to mechanical damage, and erosion failures caused by the upstream pressure regu?ator failing, and causing a 60 psig inlet pressure to the coil rather than the specified 25 psig.
Pump deficiencies noted in the past include bearing wear, coupling thread galled, wear ring out of specification, and galled stuffing box bushings.
175ff M 6
Diiettor December 20, 1979 6.
Maintenance and operational history on the pumps is presently available in the form of trouble tickets and periodic tests.
Fro.n the available information, the longest interval for operation, the number of cycles during this interval, duration of each cycle, the operating mode, the longest continuous operation at or near rated flow, and the pump status at the completion of that run are shown in Table 1.
It should be noted that these pumps are normally running (in a salt water application) in contrast with ECCS pumps which are normally in standby in fresh water application.
We trust that this information satisfies the request of IE Bulletin 79-15.
Yours very truly,
/
/
//vY
$,/J.Furr Vice President Nuclear Operations RMP/CSB/eaj*
Enclosures cc:
Mr. James P. O'Reilly 5
175 317
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TABLE 1 Longest Interval Approximate Duration Of Operating Longest Continuous Pump Status Pump For Operation Number of Each Cycle Mode Operation At/Near Cycles Rated Flow 1A Nuclear 19 months 29 Varied widely Rated
> 3 months Not available IB Nuclear 18 months 27 Varied widely Rated
> 3 months Not available {
lA Conventional 11 months 17 Varied widely Rated
> 3 months Not available 9
1B Conventional 7 months 11 Varied widely Rated
> 3 months Not available. tn N
IC Conventional 25 months 38 Varied widely Rated
> 3 months Not available 2A Nuclear 20 months 30 Varied widely Rated
> 3 months Not available 2B Nuclear 21 months 32 Varied widely Rated
> 3 months Not available 2A Conventional 18 months 27 Varied widely Rated
> 3 months Not available 2B Conventional 24 months 36 Varied widely Rated 1 3 months Not available 2C Conventional 18 months 27 Varied widely Rated
> 3 months Not available t
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