ML20115A986
| ML20115A986 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 10/09/1992 |
| From: | Mccarthy D CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLS-92-249, NUDOCS 9210150206 | |
| Download: ML20115A986 (4) | |
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CP&L Carolina Power & Ught Company OCT 0 91992 SERIAL: NLS 92 249 United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, L' NIT NOS.1 AND 2
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DOCKET NOS. 50 325 & 50 324/ LICENSE NOS. DPR-71 & DPR-62 ADDITIONAL INFORMATION REGARDING SERVICE WATER PUMP SEISMIC QUALIFICATION Gantlemen:
The purpose of thit letter is to provide information requested by the NRC staff during a telephone conference call on August 17,1992, concerning service water pump seismic qualification issues.
The staff questions relate to Carolina Power & Light Company's July 10,1992 submittal (Serial Number NLS 92136) for the Brunswick Steam Electric Plant, Units 1 and 2.
Please refer any questions regarding this submittal to Mr. M. R. Oates at (919) 546 6063.
Yours very truly, 5
D. C. McCarthy Manager Nuclear Licensing bection KAH/WRM/kah (swpump.wpf)
Enclosure cc:
Mr. S. D. Ebneter Mr. R. H. Lo
'Ar R. L. Prevatte
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W' ENCLOSURE 1 BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2 NRC DOCKET NOS, 50-325 & 50-324-OPERATING JCENSE NOS. OPR 71 & DPR-62 SW PUMP SEISMIC CUAllFICATION INFORMATION NRC QUESTION 1:
Provide a description of your service water pump maintenanct program (s).
b CPALRESPONSE:
The maintenance and testing activities associated with the service water pumps and motors are listed in Table 1, Also listed are the preventive maintenance procedures for the pump intake bays
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- and traveling screens l sincb these procedurn have an impact on pump performance, in addition to the procedurt,s listed in Table 1, the auxiliary operators perform daily rounds and record data, as specified la Operating instruction (01) 3.4, Daily Check Sheets - Auxiliary Operator Daily Rounei f
The changes being implemented to minimize service water pump maintenance are upgrades to pump ma*erials, conversion to product-lubrication for the pumps, and upgrade of the motor thrust bearings. The pump materia!s are being upgraded to enhance long-torm corrosion resistance. In particular, replacement of cacbon steel fasteners with Monel and the carbon steel pump base plates with a stainless steel material will reduce maintenance due to corrosion.
The conversion to product-lubrication for the purop bearings and the' thrust bearing = 3 grade will.
allow the service water tube water system to be remo"ed from service. This sy0 tem has a great L
_. deal of corrective mainteriance.1The cyclene separators, which filter the lobe water prior to each -
. service water pump, have been susceptible to clogging, requiring maintenanco involvement to rod
-out the separators. The service water tube water pressure reiief valves (PRVs), which reduce lube water oressure before it enters the cooling coils, also have been corrective maintenance items; Malfunction of the PHVs can resu.iin higher flows and higher velocitiesin the cooling coils. causing -
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increased wear of ',he coils and fittings. Removal of the service water lobe water system will' eliminate these cencerns, b
NRC QUESTI'ON 2:
Provide the short term quali.! cation criteria being used for the service water pumps..
P&L RESPONSE:
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- The short-term qualification criteria being used for the service water pemps are contained in thel l
L Nuclear Engineering Department (NED) Design Guide DG-il.20 (Revision 2). This design guide,
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along with a discussion of the acceptance criteria, wero previously submitted to the NRC by letter dated April 15,1992 (Serial Number NLS-92-118). The short-term qualification criteria used are -
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'3 percent damping for the design basis earthquake (DBE) and allowable stresses of 90 percent of -
the minimum material yield stresses. More detailed information is contained in the Design Guide and in the specific pump stress analysic performed for CP&L by Mcdonald Engineering Analysis, Inc. The pump stress report has been received by CP&L and is currently undergoing review to verify the results.
NBC OUESTION 3:
Summarize the results of engineering analyses being performed for the service water system (including lines less than 1-112 inch).
CP&L RESPONSE:
The only remaining stress work activity associated with the service water pumps is the analysis of the pump discharge piping lines. These lines are currently being analyzed by the Brunswick Design Tu nover Project (DTOP) group. The service water system is the last large bore system required to be analyzed under the IE Bulletin 79-14 Program. Piping stiffnesses developed during the IE Bulletin 79-14 Program have been included in the service water pump stress report. Any support -
modifications required as a result of these analyses will be implemented following the final piping stress analyses.
The service water lube water system, from the main service water headers to the service water pumps, has been analyzed. Qualified piping supports have been designed using the final analyzed loads and are currently being installed. The service water lube water lines, which carries lube water down the pump column to the suction bell bearings, are supported from the pump column flanges and have been analyzed as part of the Service Water Pump Stress Report. The resultant stresses in these 1/2-inch lines have been shown by these analysec to be within the material allowables.
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4 TABLE 1 SERVICE WATER PUMP MAINTENANCE ACTIVITIES PROCEDURE TITLE / DESCRIPTION FREQUENCY ENP 2706 Service Water Pump Motor Log Quarterly ENP-2702.1 Infrared Thermography Predictive Annual Maintenance OPDM-MEC 514 Vibration Data Collection -Pump Vibration 28 Days Trending OPM-LUB 500 Plant Equipment Lubrication Schedule--
Annual Motor Oil Sample inspection OPM M509 Visual Inspection of Electnc Motors -
Annual inspect and Clean Motor Air Passages OPM-M511 Service Water Pump Motor Shaft inspection Refueling OPM STU 500 Service Water Intake Structu'e Inspection Refueling and Cleaning OSPP RTD-004 Inspection of Service Watr.c Pump Motor Annual RTDs PPX-503 Backflush Motor Oi! Cy>ler Annual PT 24.1-1 U1 Service Water Purip & Dirharge Valve Quarterly Operability Test--Sat:sfy Section XI requirements PT-24.1 -2 U2 Scrvice Water Pump & Discharge Valve Quarterly Operability Test--Satisfy Section XI i
l requirements 01-3.4 Daiiy Check Sheets--Auxiliary Operator Daily and per shift Daily Rourds
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