ML17298A893

Rev 1 to RCS Demonstration Test.

ML17298A893
Person / Time
Site:	Palo Verde
Issue date:	02/29/1984
From:	ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:
Shared Package
ML17298A892	List: ML17298A891 ML17298A893
References
PROC-840229, NUDOCS 8403160052
Download: ML17298A893 (16)

Text

Rev. 1 2/29/S4 REACTOR COOLANT SYSTEM DEMONSTRATION TEST 1.0 The primary objectives of the 'Reactor Coolant System Demonstration Test are as follows:

1.1 To verify the adequacy of the modification to the Upper Guide Structure (UGS).

1.2 To verify the adequacy of the modification to the four main Reactor Coolant Pumps.

1.3 To verify the adequacy of the redesign of the Reactor Coolant System Thermowells.

1.4 To measure and determine the Reactor Coolant System pump flow rates as follows:

1.4.1 Using Ultra Sonic flow measuring equipment 1.4.2 Using a high speed data logger (TDAS) to measure and record the RC pump delta pressures during coast down tests 1.5 To record, for baseline data, various Reactor Coolant Pump temperature, pressure and flows for all four RCP's on a continuous basis.

1.6 To record for baseline data on a continuous basis Reactor Coolant System and supporting plant system parameters. i.e.;

1.6.1 Nuclear Cooling Water temperatures 1.6.2 Nuclear Cooling Water flows 1.63 Seal injection flows 1.64 Seal injection temperatures 1.7 To collect data for a minimum of 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> of four (4) pump steady-state, operation at a RCS temperature of 565 + 5'F and 2250 + 15 psia.

1.7.1 CE has determined through analysis of the Precritical Vibration Analysis Program (PVAP) data obtained from the Hot Functional testing that the primary forcing function frequency driving the UGS is approximately 14 Hz.

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Rev. 1 2/29/84 1.7.2 Per Nuclear Regulatory Guide 1.20 requirements "to obtain sufficient vibratory cycles on all components" within the UGS at a forcing function frequency of 14 hertz then the time required equals:

50,400 cycles/hr 8 14Hz rate 198.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

2.0 Method to Obtain and Verify Objectives 2.1 Four major instrumentation test stations are being assembled to acquire and record data from both permanent plant instruments and temporarily installed instruments.

The permanent plant instruments will be used to provide baseline data on a continuous basis.

The temporary instrumentation will be used to verify the pump modifications, the UGS modifications and the thermowell redesign.

The temporary instruments can be categorized as follows:

2.1.1 Accelerometers 2.1.2 High Frequency Pressure transducers 2.1.3 Strain gauges 2.1.4 Ultra-sonic crystals 2.1.5 Suction pressure pressure transducers 2.2 Recording instrumentation 2.2.1 Thirteen 8 channel strip chart recordersit 2.2.2 Five, 14 channel FM magnetic tape recorders 2.2.3 Micro-processor controlled data'oggers 2.2.3.1 PERM DAS Permanent Data Acquisition System i

2. 2. 3. 2 DART Data Acquisition and Retrievable Termi nal 2.2.3.3 TDAS Temporary Data Acquisition System

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Rev. 1 2/29/S4 2.3 Temporary Reactor Coolant System Pump Instruments 2.3.1 A tri-axial accelerometer mounted on the thrust bearing assembly on each of the four RCP's will monitor vibration/motion transferred from the pump/impeller through the pump shaft to the thrust bearing.

2.3.2 Three high frequency pressure transducers will measure the pressure pulses caused by the impeller vanes. Both frequency and amplitude of the pulses will be obtained and recorded:

These pressure pulse signals will also be routed to the UGS instrumentation test station so that the relationship between the pump pressure pulses and vibration and strain occurring within the UGS can be determined.

2.3.3 Three (3) tri-axial accelerometers, magnetically mounted on two of the cold legs and on Hot Leg 1 will measure pump induced vibrations of the RCS piping.

2.3.4 Four pressure transducers are being installed to measure the pump suction pressure for each of the Reactor Coolant pumps to verify adequate suction head pressure is present any time the pumps are in operation.

2.3.5 The Ultra-sonic crystals will be mounted on Hot Leg 1 and 2 to be used with the Ultra-sonic flow measuring equipment to determine the RCP flows for the system.

2.4 Thermowell Instrumentation 2.4.1 Three thermowells will have internally mounted bi-axial accelerometers to measure the motion of the thermowells caused by the pump pressure pulses. One of the thermowell outer nozzles will also have a bi-axial accelerometer to measure motion at the outer connector-head location to determine if any vibratory motion is being induced external to the RCS piping.

2.5 UGS Instrumentation 2.5.1 Nine bi-axial accelerometers are mounted in and on the tubes within the UGS to monitor vibration.

2.5.2 Seven high frequency pressure transducers are also mounted with the tubes to measure pressure pulses occurring in the tubes.

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2. 5.3 Eighteen (18) strain gauges are mounted on the tubing and webbing within the UGS particularly in those areas where damage was found after the Hot Functional test.

3.0 Procedures 3.1 Controlling and Sequencing 3.1.1 The Reactor Coolant System Test Procedure 91HF-1RC17 has been written to control, sequence and coordinate data acquisition by the instrumentation test stations personnel and equipment as a fifty (50) test step sequence is performed to verify the test objectives and begin a 200 hour0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> steady-state four pump run.

3.2 Implementing Procedures 3.2.1 Three implementing procedures have been written to provide a defined and controlled data acquisition system at each of the major test stations. These procedures are as follows:

3.2.1.1 UGS Modification Verification 91HF-1RC18 3.2.1.2 RCS Pump Data, Operating 6 Continuous Monitoring 3.2.1.3 Pre-Core RCS Flow Rate 91HF-lRC03, Rev. l.

3.3 Pre and Post-test Inspection RV.

3.3.1 The pre-inspection procedure will be a visual inspection with photographs.

3.3.2 The post-test inspection will occur after the Demonstration Test has been completed and Reactor Vessel is disassembled.

3.4 Post-test Inspection Reactor Coolant Pump 3.4.1 At least one RCP will be disassembled and inspected for wear, damage, cracking, and cavitation effects after the RCS has been vented, cooled down, and drained.

4.0 Pre-Test Initial Conditions The Pre-Core Hot Pump Test Controlling Document, 91HF-1ZZ05 f'.1 will define and control operating support systems, valve line-ups and maneuver the plant to the pressure and temperature plateaus

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Rev. 1 2/29/84 required by the Reactor Coolant System Demonstration Test Procedure 91HF-1RC17. The Demonstration Test Director will control the Reactor Coolant pump starts, stops, and steady-state pump combinations required to reach the four pump 200 hour steady state run.

4.2 The initial temperature and pressure plateau is 150'F and 360-375 psia.

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This allows fill and vent, pressurizer bubble 5.0 Temperature and Pressure Bar-graph Explanation 5.1 there are seven (7) basic temperature steps denoted by the bar graph as follows:

5.1.1 150'F + O' 5.1.2 200'F + 5'F 5.1.3 260'F + 5'F 5.1.4 360 F + 5'F

5. 1. 5 500'F + 5'F 5.1.6 550'F + 5 F 5.1.7 565'F + 5'P and 565'F + 0.5'F The 565'F + 0.5'F is maintained during the ultrasonic flow measurements.

5.2 There are four (4) basic pressure plateaus denoted by the bar graph as follows:

5.2.1 360 375 psia 5.2.2 360 - 390 psia 5.2.3 1485 - 1515 psia 5.2.4 2235 2265 psia

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5. 3 Bar graph numbering 5.3.1 The numbers written above the bar graph plateaus such as 6- -16, 17 for temperature plateau 255 265'F (written below the bar) indicates those Test Sequences being performed in order at that temperature (and also pressure).

5.4 Test Step Summary (145-155'F, 360-375 psia) 5.4.1 Test Steps 1 5 will monitor the following:

5.4.1.1 Internal/External thermowell vibration 5.4.1.2 Pump vibration and shaft orbit data.

5;4.1.3 RCS pipe motion 5.4.1.4 UGS vibration, pressure and strain 5.4.1.5 Pump pressure pulsations 5.4.1.6 Pump suction pressure 5.4.2 Test Steps 6 17 (255 265'F, 360 375 psia) 5.4.2.1 Pump vibration and,orbit data Y

5.4.2.2 RCS pipe motion 5.4.2.3 UGS Vibration, pressure, and strain 5.4.2.4 Pump pressure pulsations 5.4.2.5 Pump suction pressure Various single, dual and three pump configurations are provided during these test sequences, including start, stop, and steady-state conditions.

5.4.3 Test Steps 17 19 (355 365'F, 360 390'sia) 5.4.3.1 Pump vibration and orbit data 5.4.3.2 RCS pipe motion

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Rev. 1 2/29/84 5.4.3.3 Pump pressure pulsations 5.4.3.4 Pump suction pressure 5.4.4 Test Steps 20 25 (495 505'FF, 1485 1515 psia) 5.4.4.1 Pump vibration and orbit data 5.4.4.2 RCS pipe motion 5.4.4.3 Pump pressure pulsations 5.4.4.4 Pump suction pressure 5.4.4.5 UGS vibration, pressure, strain 5.4.5 Test Steps 25 39 (545 555'F, 2235 2265'sia) 5.4.5.1 Pump vibration and orbit data 5.4.5.2 RCS pipe motion 5.4.5.3 Pump pressure pulsations 5.4.5.4 Pump suction pressure 5.4.5.5 UGS vibration, pressure, strain (UGS data completed at test step 39).

5.4.6 Test Steps 39-1 49 (560 570'F or 564.5 565.5'F 8 2235 2265'sia)

These test steps are primarily for determining the RCS combined flows using the Ultra-Sonic Flow Measuring equipment. Some of the Test Steps are used to maneuver the pump combinations for 4 pump steady-state flow, no flow (all pumps off) and coast downs (RCP delta-pressure measurements) two pump combination. When flow data is being collected by ultra-sonics the temperature must be very stable. This is the reason for the 565 + 0.5'F tolerance.

5.4.7 After the successful completion of all test steps through and including 49, the RCS will begin the 200 hour0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> 4 pump steady-state run. Data will continue to be taken on a once-per-shift basis; however, all test stations will be manned in a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> continuous basis to monitor for any unsafe condition or any parameter trending towards an out-of-limit condition.

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