ML19290C664
| ML19290C664 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/15/1979 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19290C651 | List: |
| References | |
| PROC-791215-03, NUDOCS 8001220554 | |
| Download: ML19290C664 (16) | |
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SPECIAL TEST NO. 9B BORON MIXING AND C00LDOWN t
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SPECIAL NO. 9B 12/15/79 BORON MIXING AND C00LDOWN Table of Contents Page 1.0 OBJECTIVES 1
2.0 PREREQUISITES 2
3.0 PRECAUTIONS 5
4.0 SPECIAL TEST EQUIPMEttr 6
5.0 INSTRUCTIONS 7
6.0 ACCEPTANCE CRITERIA 9
APPENDIX A - References 10 APPENDIX B - Deficiencies 11 1
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SPECIAL NO. 9 B 12/15/79 TEST DESCRIPTION This test will demonstrate that the Reactor Coolant System (RCS) can be uniformly borated approximately 100 ppm while in natural circulation. Boron samples will be taken continuously from the RCS (1 and 3) hot legs and the pressurizer to verify concentration uniformity.
This test will also demonstrate the capability to cool down the RCS on natural circulation using four steam generators. Cooldown will proceed until the RCS temperature is approximately 450 F.
Auxiliary sprays will be used to provide boron mixing between the PRZR and RCS.
This will also demonstrate depressurization capability.
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SPECIAL NO. 9 B Page 1 of 9
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12/15/79 1.0 OBJECTIVE The purpose of this test is; 1) to borate and verify boron mixing while in natural circulation (NC), and 2) to demonstrate the capability to cool down and depressurize on natural circulation.
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bYf U14u.s av. yn Page 2 of 9 12/15/79 i
2.0 PREREQUISITES 2.1 The following initial conditions exist:
2.1~.1 Reactor power is at 2% to 3% RTP.
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2.1.2 Natural circulation has been established.
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2.1.3 Steam generators are being fed by the auxiliary feedvater system. Level is being maintained at approximately 33%.
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2.1.h Steam generators are steaming via the condenser or atmospheric steam dumps. (Preferred is to condenser for SG pressure equilibrium).
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j 2.15 Pressurizer heaters are in automatic and are maintaining normal operating pressure.
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2.1.6 RCS average temperature is approximately 550 F.
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2.1.7 Shutdown banks are fully withdrawn and control banks are at least at at their-inertion limit. Rod control system is in manual. The rod 160 steps.
height should be such that control bank D enda up at N
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2.1.8 PRZR level control is in automatic and maintaining programmed water level.
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2.19 The RCS and PRZR boron concentrations are within 20 ppm.
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2.2 The Reactivity computer has been checked out and flux, reactivity, Teold (avg h loops), Thot (avg h loops) are being recorded on the strip chart recorders.
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2.3 The CVCS is in a normal at power make up and letdown configuration with the exception of the auxiliary spray valve. This valve vill be operated as necessary to provide the spray function.
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SPECIAL NO. 9B Page 3 of 9 12/15/79
- 2. 0 (Continued) 2.4 Sufficient boric acid is available for borating the RCS approximately 100 ppm.
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2.5 Sufficient water is available to provide makeup for the expected cooldown to 450 F.
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2.6 SI's which are necessary to perform this test have been performed (to be supplied later).
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2.7 Prior to performing the cooldown portion of this test set up the following test signals on brush recorders:
NOTE: Exact recorder / channel parameter matching is not necessary.
2.7.1 Recorder No.1 CHANNEL PARAMETER TEST POINT RACK 1
PRZR Pressure PP/455E R1 2
PRZR Level LP/459B R1 3
LPl EL Temp TP/413E R2 4
LP2 HL Temp TP/423E R2 5
LP3 HL Temp TP/433E R2 i
6 LP4 HL Temp TP/443E R2 2.7.2 Recorder No. 2 CHANNEL PARAMETER TEST POINT RACK 1
LPl CL Temp TP/413F R6 2
LP2 CL Te=p TP/423F R6 3
LP3 CL Temp TP/433F R6 4
LP4 CL Temp TP/443F R6 5
LPl Flow FP/414B R1 6
LP2 Plow FP/424B R1 2.7.3 Recorder No. 3 CHANNEL PARAMETER TEST POINT RACK 1
LPl SG Level LP/519B R5 2
LP2 SG Level LP/529B R1 3
LP3 SG Level LP/539B R1 4
LP4 SG Level LP549B R5 5
LP3 Flow FP/434B R1 6
LP4 Flow FP/444B R1 2.7.4 Recorder No. 4 CHANNEL PARAMETER TEST POINT RACK LPl SG Press PP/516B R12 1
2 LP2 SG Press PP/526B Rll 3
LP3 SG Press PP/536B R11 4
LP4 SG Press PP/546B R12 5
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SPECIAL No. 9B Page h of 9 12/15/79 2.0 (Continued) 2.8 Trend'the following parameters on the process computer at ~ 5-minute intervals.
Wide range cold legs T0kO6A T0k26A TOLk6A I
T0h66A Wide range hot legs T0419A T0439A T0kS9A TokT9A Steam Generator Levels LOLO3A L0h23A Lokh3A LOh63A Ioop Flow FOLOOA F0h20A F04kOA F0k60A
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29 special Test 9A has been performed and data is availab e to correct the l
excore detectors for T shadowing.
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SPECIAL NO. 9B Page 5 of 9 12/15/79 30 PRECAUTTCNS, LIMITATIONS, AND ACTIONS t
3.1 Do nct exceed 5% RTP.
3.2 to not exceed any of the following temperature limits.
3.2.1 610 F for any core outlet temperature.
3.2.2 65 F for any loop 6 T.
323 578 F for any loop average.
3.3 Avoid sudden changes in auxiliary feedvater flow rate or in steam I
generator level.
3.4 Me.intain PRZR pressure at approximately 2235 psig. Care should be taken in pressure control since sprays are through the auxiliary spray flow path.
3.5 During boration operate the sprays as much as practical to provide maximum mixing in the PRZR.
3.6 Caution should be used in maintaining power level below 5% RTP during the cooldown since flux shadoving of the excore detectors vill occur is the temperature in the downcomer of the pressure vessel decreases.
i 3.T During the boration hold Teold approximately constant.
3.8 During cooldown maintain control bank D at approximately 160 steps if possible.
TI e excore shadowing correction factor was obtained in this configuration.
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SPECIAL NO. 9B Page 6 of. 9 12/15/79
'.0 Seccial Test Eauitment i
4 Identification Calibration Instrument Specification Number Verificatfor:
1 Reactivicy Computer and Associated Equipment (4) 6 recorders i
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If test instruments are changed during this test, the instrument infor=ation
=ust be recorded here and an entry =ade in the chronological log book explaining this change.
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SPECIAL NO. 9B Page 7 of 9 5.0 INSTRUCTIONS 12/15/79 5.1 Boration 5.1.1 Begin sampling the RCS and PRZR on a ns 20-minute frequency and record the data on Data Sheet 1.
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5.1.2 Verify that the system is in equilibrium with respect to power, RCS temperature, pressure, and boron concentration.
PRZR pressure-2235 t 50 psig S/G pressure -- 1005 psig RCS - PRZR baron concentration within 20 ppm Successive boron samples within i 10 ppm Reactivity is approximately zero and constant
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5.1.3 Verify that the following paraceters are recorded on the reactivity computer recorders: Record all pertinent information on recorders.
a.
1st strip chart recorder i Reactivity 11 Flux b.
2nd strip chart recorder i Average Th wide range 11 Average Tc wide range
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5.1.4 Energize PRZR heaters and initiate auxiliary sprays. Try to energize all heaters. Ideally auxiliary sprays should operate continually to provide for maximus mixing in the pressurizer. Transfer charging paths between normal and auxiliary sprays as necessary to provide for optimum pressure control and boron concentration equilization between the RCS and PRZR.
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5.1.5 Initiate boration at approximately 500 pem/hr via the borate mode.
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5.1.6 As the boration proceeds withdraw the controlling banks as necessary to maintain flux approximately constant and reactivity approximately zero.,
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NOTE: Observe T and T. They should remain approximately constant.
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5.1.7 Terminate boration after tA 100 ppm increase in RCS boron concentration at the end of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
5.1.8 Continue sampling until the baron concentration stabilizes and the system is again in equilibrium, as defined above.
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brELLAL av. zu Page 8 of 9 12/15/79 5.0 (Continued) 5.2 Cooldown NOTE: Perform SI-38, SI-48, and SI-127, periodically during the cooldown.
5.2.1 Verify that the CVCS will provide auto makeup.
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Depending on rod position and the magnitude and polarity at the iso-NOTE:
thermal temperature coefficient dilution and/or boration may be required.
5.2.2 Verify that the system is in equilibrium with respect to power, RCS temperature, presaure and boron concentration.
PRZR pressure-2235 + 50 psig S/G pressure - 1005 psig RCS - PRZF boron concentration within 20 ppm Successiv-boron samples within 10 ppm Reactivity is approximately zero and constant
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5.2.3 Start the test recorders on slow speed (5mm/ min). Record on the charts the date, time, recorder ID, parameters measured, measurement range, charts speed, test being performed and name of person recording data.
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5.2.4 Start process computer trend block.
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5.2.5 Obtain a thermocouple map and repeat every 10 F during cooldown.
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5.2.6 Before cooldown is initiated read the following statement.
Cooldown should be initiated as slow as possible to prevent possible adverse steam generator water level fluctions. When the unit operator feels comfortable with the SG 1evels the cooldown rate may be increased.
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5.2.7 Initiate the cooldown by slowly increasing the rate of steam dump When and proceed to approximately 450 F core inlet temperature.
T is reduced to 540 F block the steam flow SI and bypass the steam '
dOEhinterlocks.
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5.2.8 Use the control rods as necessary to maintain core power approximately constant. Refer to Appendix C for power indication. Control bank D should be maintained at approximately 160 steps if possible.
CAUTION: As the cold leg temperatures decrease the excore detectors will not be dependable because of neutron shadowing.
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SPECIAL NO. 9B Page 9 of 9 12/15/79 5.0 5.2 (Continued) 5.2.9 Upon reaching approximately 450 F terminate the cooldown. The test is completed; turn off the recorders and terminate the trend blocks. Attach strip chart, recorder traces, and P-250 output to this test.
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5.2.10 Insert control rods until the reactor is suberitical.
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5.2.11 Restart all four reactor coolant pumps in accordance with SOI 68.2.
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5.2.12 Allow primary system to heat up to A-547 F.
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6.0 ACCEPTANCE CRITERIA 6.1 The RCS can be borated and the boron uniformly mixed in natural circulation.
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6.2 The RCS can be cooled down to approximately 450 F on natural circulation.
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SPECIAL NO. 9B t
Page 1 of 1 12/15/79 APPENDIX A References 1.
FSAR 2.
Technical Specifications
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Appendix B 2/6/79 Page of Rev.
o Page of Test Deficiencies #
Test Deficiency i
Recommended Resolution i
s Final Resolution
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Originator Signature Date PORC Review of Final Resolution b
l )9 Approval of Final Resolution
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Plant Superintendent Date 11
SPECIAL NO. 9B Page 1 of 12/30/79 APPENDIX C Outline I.
Core Power Determination A.
Excore detector output correction factor plots.
1.
The plots obtained in Special Test 9A shc,uld be used to correct the excore detector outputs for changes in the core inlet temperatures.
B.
M/D Power Monitor Program 1.
Power Conversion Constant Adjustment a) The output of the REF prie.ary calorimetric will give a
% power output; this output must be input to the M/D Power-Monitor Program so that the program output vill be in percent power and equal to the primary calorimetric output.
2.
Power Monitoring a) The M/D Power Monitor Program vill calculate the integral power as seen by one pass of 5 or 6 detectors. After the output has been calibrated to be equal to the REF primary calorimetric it vill be rerun up to once every 2 minutes or as necessary to continuously monitor core power.
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SPECIAL NO. 9A Page 2 of l
12/30/79 APPENDIX C (Continued) i t
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