ML20042C111
| ML20042C111 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/31/1982 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML20042C110 | List: |
| References | |
| PROC-820331, NUDOCS 8203300215 | |
| Download: ML20042C111 (10) | |
Text
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DOCKET No. 50-213 APPENDIX I llADDMI NECK PIANT PUMP TESTING PROGRMi MARCil 1982 8203300215 820315 PDR ADOCK 05000213 p
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i OPERATIONAL READINESS TESTING FOR PUMPS There are fourteen (14) pumps at Connecticut Yankee which qualify for operational readiness testing under Subsection IWP of Section XI. All of these pumps are either under continuous service or periodically surveillance-tested under the plant Technical Specifications.
The attached tabulation of pumps identifies the pumps to be tested, pump code classes, parameters to be measured and test intervals.
The provisions of Subsection IWP will be adhered to insofar as installed instrumentation allows at a test frequency compatible with safe operating criteria.
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CONNECTICUT YANKEE INSERVICE PUMP TEST PROGRAM PUMP PUMP CODE MEASURED SECTION XI CYAPCO CODE IDENTIFICATION DISCRIPTION CLASS PARAMETERS TEST TEST RELIEF REQUESTED INTERVAL INTERVAL P-18-1 A Charging 2
Measurement
- Taken Per P-18-1B IWP-3400b
- 1. Speed (if variable)
N/A
- 2. Inlet Pressure (Pi)
Quarterly Ouarterly Yes - Note 1
- 3. Differential Pressure Quarterly Quarterly Yes - Note 1
- 4. Flow Rate Quarterly Qaarterly Yes - Note 1
- 5. Vibration Amplitude Quarterly Quarterly
- Note 8
- 6. Bearing Temperature Yearly Continuous No
- 7. Observe Lubricant Level or Pressure Quarterly Quarterly No P-14-1 A Residual Heat Removal 2
- 1. Speed (if variable)
N/A P-14-1B (RHR)
- 2. Inlet Pressure (P1)
Quarterly Quarterly Yes - Note 2
- 3. Differentiel Pressure Quarterly Quarterly Yes - Note 2
- 4. Flow Rate Quarterly Shutdown Yes - Note 2
- 5. Vibration Amplitude Quarterly Quarterly Note 8
- 6. Bearing Temperature Yearly None Yes - Note 7
- 7. Observe Lubricant Level or Pressure Quarterly Quarterly No
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CONNECTICUT YANKEE INSERVICE PUMP TEST PROGRAM PUMP PUMP CODE MEASURED SECTION XI CYAPC0 CODE IDENTIFICATION DISCRIPTION CLASS PARAMETERS TEST TEST RELIEF REQUESTED INTERVAL INTERVAL P-32-1A Auxiliary Steam 3
- 1. Speed (if variable)
Quarterly Quarterly No P-32-1B Generator Feed-
- 2. Inlet Pressure (P1)
Quarterly Qu'arterly No water (Steam
- 3. Differential Pressure Quarterly Quarterly No Driven)
- 4. Flow Rate Quarterly Refueling Yes - Note 3
- 5. Vibration Amplitude Quarterly Quarterly Note 8
- 6. Besring Temperature Yearly None Yes*- Note 7
- 7. Observe Lubricant Level or Pressure-Quarterly Quarterly No P-92-A low Pressure Safety 2
P-92-B Injection (LPSI)
- 1. Speed (if variable)
N/A
- 2. Inlet Pressure (Pi)
Quarterly Quarterly Yes - Note 4
- 3. Differential Pressure Quarterly Quarterly Yes - Note 4
- 4. Flow Rate Quarterly 40 Months Yes - Note 4
- 5. Vibration Amplitude Quarterly Quarterly Note 8
- 6. Bearing Temperature Yearly None Yes - Note 7
- 7. Observe Lubricant Level or Pressure Quarterly Quarterly No Revision 0 Date 2/24/82
P CONNECTICUT YANKEE INSERVICE PUMP TEST PROGRAM 4
PUMP PUMP CODE MEASURED SECTION XI CYAPC0 CODE IDENTIFICATION DISCRIPTION CLASS PARAMEi ERS TEST TEST RELIEF REQUESTED INTERVAL INTERVAL P-15-1A High Press Safet) 2 P-15-1B Injection (HPSI)
- 1. Speed (if variable)
N/A
- 2. Inlet Pressure (Pi)
Quarterly Quarterly Yes - Note 5
- 3. Differential Pressure Quarterly Quarterly No
- 4. Flow Rate Quarterly 40 lbnths Yes - Note 5
- 5. Vibration Amplitude Quarterly Quarterly Note 8
- 6. Bearing Temperature Yearly None Yes - Note 7
- 7. Observe Lub. Level or Pressure Quarterly Quarterly No P-37-1A Service Water Measurements taken per P-37-1B (SW) 3 IWP-3400b P-37-lC
- 1. Speed (if variable)
N/A P-37-lD
- 2. Inlet Pressure (Pi)
Quarterly Quarterly Yes - Note 6
- 3. Differential Pressure Quarterly Quarterly Yes - Note 6
- 4. Flow Rate Quarterly Quarterly Yes - Note 6
- 5. Vibration Amplitude Quarterly Quarterly Note 8
- 6. Bearing Temperature Yearly None Yes - Note 7
- 7. Observe Lub. Level or Pressure Quarterly Quarterly No Revision 0
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PUMPTESTREbEFREQUESTS 1.
Charging Pumps Test Requirement - Pump inlet pressure,' differential pressure and flow rate will be measured during scheduled tests.
Basis for Relief - Instrumentation for direct measurement of pump inlet pressures is not available. The static pressure of the volume control tank (head and ullage) will be used as the inlet pressure reference. The plumbing from the volume control tank to the charging pump inlets is a fixed resistance system.
System flow rate and differential pressure vary according to requirements of reactor coolant pump seals, make-up, let down, volume control tank level, etc., which makes a test at a referenced flow or differential pressure difficult to achieve. There is no recirculation piping which could be used for such a test.
Alternate Testing CYAPC0 will measure all necessary parameters. These will be used to determine a point which will be plotted on the manufacturer's performance curve. The utilization of the manufacturer's performance curve with offsets showing " alert" and " required action" tolerances is considered a satisfactory technique for evaluating pump test data in this variable resistance system.
2.
Residual Heat Removal Pumps Test Requirement - Measure flow rate and differential pressure during scheduled tests.
Basis for Relief - The RHR systems design precludes operating the pumps in any other mode but the recirculation mode while the plant is in normal operation. The recirculation circuit permits a flow of less than one percent of the RHR design rated flow. This low flow is not considered valid for evaluating the hydraulic performance of a centrifugal pump.
Instrumentation is not installe'd to measure inlet pressure to these pumps. Suction for recirculation is from the refueling water storage tank.
Alternate Testing The plumbing from the RWST to the RHR pumps is a fixed resistance system. CYAPC0 will determine and reference the RWST to pump inlet static head to establish inlet pressure. All code paraneters, including the calculated inlet pressure and excluding rated flow rate, will be measured during this scheduled recirculation test. A design flow hydraulic performance measured will be taken at cold shutdown when the RHR system is in operation. Revision 0
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3.
Auxiliary Feedwater Pumps Test Requirement - Measure flow rate during scheduled tests.
Basis for Relief - The auxiliary feedwater system design is such that during normal plant operation, the pumps can only be operated on recirculation flow from the demineralized water storage tank.
The recirculation circuit flow is approximately 50 GPM (about 10 percent of design flow).
Such a low flowrate is not considered valid for evaluating the hydraulic performance of a centrifugal pump.
Alternate Testing Scheduled tests with other parameters recorded will serve as operability tests. Flow rate is determined at refueling outages when a special test set-up allows level changes in the demineralized water storage tank to be recorded and timed to establish this measure-ment.
4.
, Low Pressure Safety Injection Pumps Test Requirement - Measure inlet pressure, differential pressure and flow rate during scheduled tests.
Basis for Relief - The LPSI system is not designed with provisions for measuring pump inlet pressure. The LPSI system design precludes operating the pumps in any other mode but the recirculation mode while the plant is in normal operation.
The recirculation circuit is a fixed resistance circuit, and as such would not require flow measurement for pump performance evaluation. However, the recirculation circ ~uit permits less than ten percent of design flow to pass. This low flow is not considered valid for evaluating the hydraulic performance of a centrifugal pump.
Full flow testing of these pumps requires flow into the reactor coolant system and as such requires considerable time and effort to provide space for the pumped water. The flow test performed during the 1980 refueling outage increased raoioactive airborne levels and delayed refueling work.
Results of this test showed both pumps still exceed design flow values.
Alternate Testing CYAPC0 will perform this full flow test each 40 months. The static head of the refueling water storage tank will be used to calculate the pump inlet pressure reference. The scheduled recirculation tests with other code required parameters recorded or determined will serve as an operability test.
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5.
High Pressure Safety Injection Pumps
_ Test Requirement - Measure inlet pressure, differential pressure and flow rate during scheduled tests.
Basis for Relief - The HPSI system is not designed with provisions for measuring pump inlet pressure. The HPSI system design precludes operating the pumps in any other mode but the recirculation mode while the plant is in normal operation. The recirculation circuit is a fixed resistance circuit, and as such would not require flow measurement for pump performance evaluation.
However, the recirculation circuit permits less than thirteen percent of design flow to pass.
This low flow is not considered valid for evaluating the hydraulic performance of a centrifugal pump.
Full flow testing of these pumps requires flow into the reactor coolant system and as such requires considerable time and effort to provide space for the pumped water.
The flow test performed during the 1980 refueling outage increased radioactive airborne levels and delayed refueling work.
Results of this test showed bcth pumps still exceed design flow values.
Alternate Testing CYAPC0 will perform this full flow test each 40 months. The static heac' of the refueling water storage tank will be used to calculate the pump inlet pressure reference. The scheduled recirculation tests with other code required parameters recorded or determined will serve as an operability test.
6.
Service Water Pumps Test Requirement - Resistance of a system shall be varied until the measured flow rate or differential pressure equals the corresponding reference value. Measure inlet pressure during scheduled tests.
Basis for Relief - The path from the river to the pumps is considered a fixed resistance system. CYAPC0 will establish pump inlet pressure references during the tests by referencing the head from the level of the river to the pump. The service water system requirements vary as river temperature and plant cooling requirements change.
These variations, both seasonal and operating, make a test at a referenced flow rate or differential pressure difficult and/or impossible.
CYAPC0 will measure all parameters (except inlet pressure) to be used to determine a point which will be plotted on the manufacturer's performance curve.
The utilization of this curve with offsets showing " alert" and " required action" tolerances is considered satisfactory method for evaluating scheduled pump test data for this variable resistance system.
7.
All pumps except charging pumps.
Test Requirement - The bearing temperature of all centrifugal pump bearings, and main shaft bearings of reciprocating pumps shall be measured at points selected to be responsive to changes in the temperature of the bearing.
Basis for Relief - Bearing metal temperature monitoring can be effective in detecting bearing problems.
However, no pumps except the charging Revision 0 Date 2/24/82 k
4 pumps, have the permanently installed temperature sensors required to measure bearing metal temperatures; i.e., outer race of anti-friction bearings or babbitt lining of sleeve bearings. The annual measurement or bearing housing temperature is far less effective in detecting bearing problems than the monthly performance of vibration signature analysis being performed by CYAPC0.
o HPSI and LPSI pump bearings are located deep inside the pump casing and are surrounded by the oil reservoir. There is no design provision for directly measuring bearing temperatures.
A-quarterly check on the lubrication level and vibration tests are accomplished.
O Service water pumps have five bearings-primarily shaft steading bearings.
It is not possible to measure temperatures of the four lower bearings due to pump casing designs. A quarterly check on the lubrication level and vibration tests are done. The upper bearing temperature of the service water pumps is recorded.
o Residual heat removal pumps have no design provision for direct measurement of bearing temperatures and the results of using a hand-held pyrometer are questionable. A quarterly check on lubrication level and vibration tests are done, o
Auxiliary feed pumps have no design provision for direct measurement.
Bearings are enclosed in oil reservoir and are not directly accessible.
A quarterly check on lubrication level and vibration tests are done.
Alternate Testing Record and analyze pump vibration as scheduled. This analysis will provide more meaningful analysis of pump bearing condition than the annual measurement of bearing temperatures.
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8.
All Pumps Test Requirenent - Measure at least one displacement vibration amplitude during each scheduled test.
Basis For Relief and Alternate Testing To meet the vibration monitoring of ASME Section XI, Section IWP, exception is taken to the specific vibration requirements of IWP and an alternate, more effective vibration analysis program, as described herein, is proposed.
During the scheduled inservice pump test, vibration velocity is measured. Vibration velocity is a function of displacement and frequency and is a direct measurement of component condition.
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In addition, a supplemental. program is performed which enhances the evaluation of the component condition. This program consists of octave analysis and signature analysis. The octave analysis consists of octave band data gathered on a vibration meter from 8 Hz to 8KHz. This data is then plotted on octave band plotting paper and retained as a permanent record. These plots ~are compared to baseline' data and to previous data for a continuing evaluation of the condition of the component.
The vibration signature consists of an automatic plot of vibration amplitude in velocity versus frequency typically over a frequency range of 0-500 cycles r r second.
This supplemental vibration program analysis approach provides for the early detection of deterioration of pump mechanical condition, a determination of the cause of problems, and a more accurate assessment of the vibration severity.
Criteria for evaluation of changes as to cause, severity, and the establish-ment of alert and required action ranges shall be specified in the CYAPC0 procedures.
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