ML19305E274
| ML19305E274 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/21/1980 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML19305E260 | List: |
| References | |
| 2-ST-14-01, 2-ST-14-1, NUDOCS 8004230260 | |
| Download: ML19305E274 (16) | |
Text
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2 ST 15 d
VIRGIN!A ELECTRIC AND POWER COMPANY aevision No.: 0 Date:
STARTUP TEST PROCEDURE FOR NN
---POWER STATION UN IT g 2
TITLE:
BORON MIXING AND COOLDOW!!
i Prepared By:
E.R. SMITH; JR Date:
Engineering Recomended Aoprovat:
Date:
STATION NUCLEAR SAFETY ANO OPERATING CCMMITTEE APPROVAL OF PROCEDURE _:
Chairman's Signature:
Date:
All personnel conducting actual testing in accordance with this procedure will verify by their signature that they have read it in its entirety prior to ccanencing any testing:
.nr a CON 7goLLED poCOME"
,:; s
...e y,CR " ICE 31,,-e,ST F.1, /.J' < 0; d
TEST RESULTS REVIEVED BY ENGINEERING:
g TEST RESULTS APPROVED BY STATION NUCLEAR SAFETY AND GPERATING COMMITTEE:
Chairman's Signature:
Date:
Coments :
800423o 260
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l TEST RESULTS (Use additional pages as needed)
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2-ST-15 Page 1 of 9 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NO. 2 BORON MIXING AND COOLDOWN
References:
1.
Precautions, Limitation and Setpoints for Westinghouse NSSS system 2.
Technical Specifications, North Anna Unit #2 3.
WCAP-8747: North Anna Nuclear Design Report i
4.
North Anna Station Curve Book 5.
2-0P-5.2 6.
2-0P-30 7.
2-0P-31 8.
2-0P-32.1 1.0 Purpose 1.1 To borate and verify boron mixing while in natural circulation.
1.2 To demonstrate the capability to cooldown and depressurize on natural circulation.
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2-ST-15 Page 2 of 9 Initials 2.0 Initial Conditions 2.1 The following initial conditions exist:
2.1.1 Reactor power is at 2% to 3% RTP.
2.1.2 Natural circulation has been established.
2.1.3 Steam generator level is being maintained at approx-imately 33% on the narrow range indicators.
2.1.4 Feedwater and condensate systems are in service in accordance with 2-0P-30 and 2-0P-31.
If main feedwater pump operation cannot be maintained under these condi-tions, the auxiliary feedwater system will be used in accordance with 2-0P-32.1.
2.1.5 Steam generators are steaming via the condenser or atmospheric steam dumps.
(Preferred is to condenser for SG pressure equilibrium).
F 2.1.6 Pressurizer heaters are in automatic and are maintain-ing normal operating pressure.
2.1.7 RCS average temperature is approximately 550'F.
2.1.8 Shutdown banks are fully withdrawn and control banks are at least at their inertion limit. Rod control system is in manual. The rod height should be such that control bank D ends up at ~ 160 steps.
2.1.9 PRZR level control is in automatic and maintaining programmed water level.
2.1.10 The RCS and PRZR boron concentrations are within 20 l
ppm.
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2.2 The CVCS is in a normal at power make up and letdown configura-tion with the exception of the auxiliary spray valve. This j
valve will be operated as necessary to provide the spray function.
2-ST-15 Page 3 of 9 Initials 2.0 Initial Conditions (cont.)
2.3 Sufficient boric acid is available for borating the RCS approxi-mately 100 ppm.
2.4 Sufficient water is available to provide makeup for the expected cooldown to 450'F.
2.5 Perform the following:
2.5.1 Install brush recorders to record data at the following locations.
Brush Recorder No. 1 Connect To:
Monitoring i
Channel No. 1 FP-414B, C1-432 RCS Flow, Loop 1
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Channel No. 2 FP-424B, C1-433 RCS Flow, Loop 2 Channel No. 3 FP-434B, C1-434 RCS Flow, Loop 3 Channel No. 4 PP-455B, C1-427 Pzr Pressure i
Channel No. 5 FP-459B, C1-442 Pressurizer Level Bruch Recorder No. 2 Connect To:
Monitoring Channel No. 1 PP-474B, C2-433 Stm. Gen. #1 Press.
Channel No. 2 LP-474B, C1-429 Stm. Gen. #1 Level Channel No. 3 FP-474B, C3-741 Stm. Gen. #1 Sta Flow Channel No. 4 PP-484B, C2-444 Stm. Gen. #2 Press.
Channel No. 5 CP-489B, C1-430 Stm. Gen. #2 Level Channel No. 6 FP-484B, C3-746 Stm. Gen. #2 Stm. Flow Brush Recorder No. 3 Connect To:
Monitoring Channel No. 1 PP-494B, C2-445 Stm. Gen. #3 Pressure Channel No. 2 LP-494B, C1-431 Stm. Gen. #3 Level Channel No. 3 FP-494B, C3-748 Stm. Gen. #3 Stm. Flow Channel No. 4 S/6A Aux Feed Flow Channel No. 5 S/6B Aux Feed Flow Channel No. 6 S/6C Aux Feed Flow 2.5.2 Record the following on each strip cha'i a) Test Number b) Recorder QA Number c) Time and Date d) Chart Speed e) Scale Used f) Test Point g) Parameters
2-ST-15 Page 4 of 9 I
Initials 2.0 Initial conditions (cont.)
2.5.3 Record on reactivity-computer recorder a.
Flux b.
Average wide range Tcold c.
Average wide range T hot d.
Average Steam generator pressure 2.6 Four incore T/C may be trended on the analog trend recorder on the main control board.
(Suggest trending the four hottest thermocouples, one from each quadrant.)
2.7 2-ST-7 has been performed and data is available to correct the excore detectors for T shadowing.
C 2.8 Notify the Shift Supervisor on duty of the impending test and co-ordinates its performance through him.
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2-ST-15 Page 5 of 9 Initials 3.0 Precautions 3.1 Do not exceed 5% RTP.
3.2 Do not exceed any of the following temperature limits.
3.2.1 610'F for any core outlet thermocouple.
3.2.2 65'F for any loop A T.
3.2.3 580.3*F for any loop T average.
3.3 Avoid sudden changes in auxiliary feedwater flow rate or in steam generator level.
3.4 Maintain 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 shadowing of the excore detectors will occure as the temperature in the downcomer of the pressure vessel decreases.
3.7 During the boration hold Tcold approximately constant.
3.8 During cooldown maintain control back D at approximately 160 steps if possible. The excore shadowing correction factor was obtained in this configuration.
3.9 Note possible effects of a positive moderator temperature coefficient.
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2-ST-15 Page 6 of 9 Initials 4.0 Instructions i
4.1 Boration 4.1.1 Begin sampling the RCS and PRZR on a ~ 20-minute fre-quency and record the data on the Data Sheet 4.1.2 Verify that the system is in equilibrium with respect
{ to power, RCS temperature, pressure, and boron concen-tration.
PRZR pressure ~ 2235 50 psig S/G pressure ~ 1005 psig
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RCS PRZR boron concentration within 20 ppm Successive boron samples with in 10 ppa Reactivity is approximately zero and constant 4.1.2 Energize PRZR heaters and initiate auxiliary sprays.
Try to energize all heaters.
Ideally auxiliary sprays should operate continually to provide for maximum mixing in the pressurizer. Transfer charging paths i
between normal and auxiliary sprays as necessary to i
provide for optimum pressure control and boron concen-tration equilization between the RCS and PRZR.
4.1.4 Initiate boration at approximately 500 pcm/hr via the borate mode.
4.1.5 As the boration proceeds withdraw the controlling banks I
as necessary to r.intain flux approximately constant and reactivity approximately zero.
NOTE:
Observe T and T. They should remain approximately C
h constant l
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2-ST-15 Page 7 of 9 Initials 4.0 Instructions 4.1.6 Terminate boration after
- 100 ppm increase in RCS i
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 />.
4.1.7 Continue sampling until the boron concentration stabi-t lizes and the system is again in equilibrium, as i
defined above.
4.2 Cooldown 4.2.1 Verify that the CVCS will provide auto makeup.
NOTE:
Depending on rod position and the magnitude and polarity I
at the isothermal temperature coefficient dilution and/or boration may be required.
4.2.2 Verify that the system is in equilibrium with respect to power, RCS temperature, pressure and boron concentra-tion.
PRZR pressure ~ 2235 50 psig S/G pressure
- 1005 psig i
RCS PRZR boron concentration within 20 ppa i
Successive boron samples within 10 ppe
)
Reactivity is approximately zero and constant 4.2.4 Start process computer trend block.
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4.2.5 Obtain a thermocouple map and repeat every 10*F during cooldown.
4.2.6 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 levels the cooldown rate may be increased.
2-ST-15 Page 8 of 9 Initials 4.0 Instructions 4.2.7 Initiate the cooldown by slowly increasing the rate of steam dump and proceed to approximately 450*F core inlet temperature. When T,y is reduced to less than 543*F, bypass the steam dump interlocks.
4.2.8 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 i
at approximately 160 steps if possible.
t CAUTION: As the cold leg temperatures decrease the excore detectors will not be dependable because of neutron shadowing.
4.2.9 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.
4.2.10 Insert control rods until the reactor is subcritical.
4.2.11 Restart all three reactor coolant pumps in accordance with 2-0P-5.2.
4.2.12 Allow primary system to heat up to
- 547*F.
Completed By:
Date:
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Page 9 of 9 I
I 5.0 Acceptance Criteria t
5.1 The RCS can be borated and the boron uniformly mixed in natural circulation.
i 5.2 The RCS can be cooled down to approximately 450*F on natural l
l circulation.
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6.0 Attachments t
6.1 Test Equipment Data Sheet 6.2 Data Sheet 6.3 Trend Blocks i
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I 2-ST-15 i
i.1 Page 1 of 1 i
TEST EQUIPMENT DATA SHEET e
i TEST EQUIPMENT DESCRIPTION
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- NOTE: This applies only to temporarily installed test equipment or instrumentation 4
Permanent instrumentation which is part of the system and shown on drawings should not be included.
Completed By:
Date:
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2-ST-15.2 Page 1 of 1 DATA SHEET RCS PZR TIME BORON BORON REMARKS CONC.
CONC.
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Date:
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2-ST-15.3 Page 1 of 2 PROCESS COMPUTER TREND BLOCK A l
COLUMNS ADDRESS PARAMETER UNITS 1
T0406A RCL A T F
COLD 2
T0426A RCL B T F
COLD 3
T0446A RCL C TCOLD 4
T0419A RCL A T F
HOT 5
T0939A RCL B T F
H0T 6
T0959A RCL C TH0T 7
T0400A T
LOOP A
'F AVG 8
T0420A T
AVG 9
T0440A T
LOOP C
'F AVG 10 T0403A AT LOOP A 11 T0423A AT LOOP B 12 T0443A AT LOOP C 13 F0128A CHARGING FLOW GPM 14 F0143A LETDOWN FLOW GPM 15 U1250 HIGHEST REL FUEL ASSY PWR 16 LO480A PRESSURIZER LEVEL 17 LO112A VCT LEVEL 18 U1251 HIGHEST REL ASSY PWR INDENT i
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2-ST-15.3 Page 2 of 2 PROCESS COMPUTER TREND BLOCK B COLUMNS ADDRESS PARAMETER UNITS I
LO400A S/G A LEVEL 2
LO420A S/G B LEVEL 3
LO440A S/G C LEVEL 4
PO400A S/G A PRESS PSIG S
PO420A S/G B PRESS PSIG l
6 PO440A S/G C PRESS PSIG 7
P0480A PRESSURIZER P PSIG 8
PO498A RCL SYSTEM P PSIG 9
P0142A CHARGING PRESS PSIG 10 UO482 AVG PZR PRESS PSIG 11 UO483 AVG PZR LEVEL 12 U1118 RX THERMAL POWER MW I
i 13 U1170 AVG T/C TEMP
- F 14 AS REQUIRED HOTTEST T/C (QUADRANT 1)
- F 15 AS REQUIRED HOTTEST T/C (QUADRANT 2)
- F 16 AS REQUIRED HOTTEST T/C (QUADRANT 3)
- F 17 AS REQUIRED HOTTEST T/C (QUADRANT 4)
- F
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