ML17310A677
| ML17310A677 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/09/1993 |
| From: | ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | |
| Shared Package | |
| ML17310A676 | List: |
| References | |
| 13-MC-ZZ-643, 13-MC-ZZ-643-R01, 13-MC-ZZ-643-R1, IEB-88-008, IEB-88-8, NUDOCS 9310080257 | |
| Download: ML17310A677 (32) | |
Text
A'NPP CALCULATIONSHEET CALC. TITLE AUXILIARYSPRAY LINETHERMALSTRATIHCATION CALC NO 13-MC-ZZ-643 STRATIFIEDTHERMALANALYSISOF THE 2-INCH DIA.PIPE SHEET NO.
REV ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE CHECKER DATE Rev.
Indi-c$1nf
3.0 REFERENCES
I 1)
Chem. Vol. Control Sys. AuxiliarySpray Draw. No. 13 - P - CHF - 107, Rev. 16 2)
BPC, Reactor Coolant System - Pressurizer Spray Line Iso.,Sketch Sheet 13 -P-RCF - 102, Rev.5, Prob. RC-502, Sheets 1lA and 11B.
3)
Letter 281-00896-MAR/KMS, dated July 31, 1992 from M.,A. Radspinner to File, "CATS Item 41011, IEB 88-08 Thermal Stresses in Piping Connected to the RCS" 4)
Letter 161-04571-WFC/JMQ, dated January 15, 1992 &om W.F. Conway, APS to NRC, "Response to NRC request forAdditional Information on NRC Bulletin 88-08" 5)
Calculation No. 13-MC-ZZ-588, Rev. 4, dated 12-15-89. "CVCS AuxiliarySpray Line Class 1 Pip-ing.
6)
Calculation No. 13-MC-ZZ-596, Rev. 4, dated 4-27-'90. "Pressurizer Spray Lines Class 1 Analysis."
7)
"Reduction and Assessment of Surge Line and AuxiliarySpray Line Temperature and Displacement Data," September 1991, prepared by Fatigue Evaluation Services, ABB'Combustion Engineering Nu-clear Power.
8) 1977 ASME Boiler and Pressure Vessel Code,Section III,Division 1 including Summer 1979 Adden-da.
9)
ANSYS - Engineering Analysis System Computer Code, Revision 4.4A, 1989.
- 10) Calculation No. 13-MC-CH-531, Rev. 5, dated 2-18-92. "CVCS AuxiliarySpray Line Class 2 Piping Analysis."
9310080257 9'31001 PDR ADOCK 05000528 8
~ 0 CALCULATIONSHOT CALC. TITLE AUXILIARYSPRAY LINETHERMALSTRATIFICATION CALO NQ 13-MC-ZZ-643 SUBJECT STRATIFIEDTHERMALANALYSISOF THE 2-INCH DIA.PIPE SHEET NO.
REV ORIGINATOR DATE CHECKER gas DATE REV ORIGINATOR DATE CHECKER DATE Rev.
Indi-4.0 AUXILIARYSPRAY LINETRANSIENTDEFINITIONS PIPING SYSTEM DESCRIPTION The function of the AuxiliarySpray Line is to provide the operator with an auxiliary pressurizer spray to control the Reactor Coolant System, RCS, pressure during the final stages ofreactor shutdown by allowing cooling of the pressurizer. The Aux. Spray Line is part of the Chemical Volume Control System, CVCS, and is located between the charge line (Loop 2A) and the pressurizer, (RCE-X02). It is a 2-inch Schedule 160pipe size. The upstream end connects to the charge line where it takes the fluid, (reactor coolant) &om this charge line. Note that the section of the charge it connects to is a portion after the regenerative heat exchanger outlet nozzle. The down stream end connects to the 4-inch main spray line, and the main spray line immediately connects to the pressurizer inlet nozzle.
NORMALSTART-UP OPERATIONS The pressure in the-line rises from atmospheric pressure to 2250 psig. After equilibrium of the system is attained the flow in the line drops back to zero flow, while the temperature and the pressure in the pipe system remain at 125 F,and 2250 psig.
NORMALOPERATIONS During Normal Operations ofthe plant systems such as at fullpower, step power changes and ramp power changes, there is no flow in the AuxiliarySpray Line. In the system heat-up Operating Condition, circula-tion starts in the loop with coolant flow and temperature of44.0 GPM and 120 F.
UPSET OPERATIONS In normal operations of the plant system an upset condition is assumed where the AuxiliarySpray Line may inadvertently function at fullpower. For this event the coolant pressure is maintained at 2250 psig and the fluidtemperature rises from an initialtemperature of 125 F to 460 F in a short time and the flowreaches to 61.6 GPM.
NORMALSHUTDOWN OPERATIONS During'normal shutd'o~ or'rea'ctor-cooling,she flowirnhirpipe system increases. from-zear6ow-to-61~
GPM and the temperature of the fluid increases from 125 F to 225 F. However, the pressure in the line remains the same, 2250 psig. After the pressurizer is cooled the flowwillslowly be reduced to zero, the fluid temperature willbe reduced to 70 F and pressure willbe reduced to atmospheric pressure.
THERMALSTRATIFlCATION As a part of APS response to NRC, Reference (4), NED assessed Unit 3 AuxiliaryPressurizer Spray Sys-tem temperature data. This data was recorded to evaluate the potential for thermal stratification in the AuxiliarySpray Line. The data reduction performed by. ABB-CE focused primarily on plant heat-up and cooldown operations. In Reference (4) APS concluded that the AuxiliarySpray Line did not exhibit ther-mal stratification due to leakage as described in IE Bulletin 88-08. However the line did exhibit a top-to-bottom temperature differential ofup to 115 F in the portion of the pipe system between Valve V-431 and
C
ANPP CALCULATIONSHE CALC. TITLE AUXILIARYSPRAY LINETHERMALSTRATIFICATION PALP NP 13.MC-ZZ-643 SUBJECT STRATIFIEDTHERMALANALYSISOF THE 2-INCH DIA.PIPE SHEET NP.
REV ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE CHECKER DATE Rev.
Indi-5.0 CALCULATIONS Calculations were performed by using ANSYS Version 4.4A computer code'because this code allows the input of the variable pipe wall temperatures experienced during stratification. The input is shown in Sec-tion 6.0 based on Histograms per the existing Class 1 design basis calculations (References 5 and 6). Al-though the monitored temperatures were in the range of400 F at top to about 285 F on bottom ofpipe, the thermal load cases were input with the Main Spray operating temperature on the top less 115 F for the bot-tom temperature. This was done for conservatism as the higher temperature values yield a larger differen-tial expansion top to bottom due to their larger mean coefficients. The stratified section isSection I as described on the following sheets and shown on the sketch on sheet 40.
The input and stress summaries for each individual load case output are shown in Attachments 1 and 2, The maximum stresses in the output are in terms of maximum stress intensity which is conservative com-pared to the bending stress as it is equal to twice the maximum shear stress and includes the effects of in-ternal pressure. Maximum stresses occur at the 4"x4"x2"Tee (Data Point 7) and at the 2" Check Valve Taper Transition Joints (Data Points 51 and 52). The results of the load case runs for expansion stress at these locations are shown in Tables 1 and 2 in Section 7.
The stratified load conditions affect only Primary Plus Secondary Stress Intensity Range, Eqtn. (10) and Peak Stress Intensity Range, Eqtn. (11) for calculating Usage Factors. Moment stresses from the ANSYS analyses are substituted for the second term in both equations. The through wall temperature gradient terms in both equations can be taken from the existing stress calculations, references 5 and 6. The moments due to dead weight, seismic inertia and seismic anchor movement are not affected by thermal stratification and were taken from the exisitng Qexibility'analysis, reference 10.
Equation (10) and Equation (11), Sp, is recalculated as'follows for the Tee and Taper Transition Joints by using the unintensified moment stress from Table 1 included in the second term of both equations. The maximum stress for all thermal load conditions in Table 1 is conservatively used to calculate the moment stresses. in-all calculations. below:.
For both locations, the Tee and Taper Transition Joints, the maximum Equation 10 stress is compared to 3 Sm. Equation 11 peak stresses for each transient are then calculated and the resulting Cumulative Usage Factors for both locations are compared with the 1.0 allowable.
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I 2-REV ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE CHECKER DATE Rev.
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REV ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE CHECKER DATE Rev.
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REV ORIGINATOR DATE CHECKER DATE
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REV ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE
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REV ORIGINATOR DATE CHECKER'ATE g.d.~
REV ORIGINATOR DATE CHECKER'ATE 'ev.
Indi CONCLUSION:
The AuxiliarySpray line is able to withstand the effects ofStratified Flow, as monitored by the PVNGS monitoring program, for a 40 year life.
The calculations incorporating Stratified Flow effects reflected increased Usage Factors at both 4"x4"x2" Tee and the Tapered Transition Joint at valve V431. The increased Usage Factors required mandatory breaks at these locations. However, there are breaks postulated at these locations.
(
Reference:
Figure 3. 6-23, UFSAR) and therefore there is no impact due to increased Usage Factors at these locations.)
6.0 OPER. TEMP. / REE TEMP.
AUX/ MAIN AUX.SPRAY MAINSPRAY
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COOLDOWN (A)
'OOLDOWN (B)
"I COOLDOWN (C)
NORMAL-10%
NORMAL+10%
UPSET LD REJE UPSET INAD.AU UPSET SPUR. EVENT I
CYCLES FLOW RATE 500 10/0 40 10/62 92 10/62 368 10/62 85 220/0 10/62 355 437/62 200,000 290/0 200,000 290/0 lYK'RN PRESS.
2250 400/2250 400/2250 400/2250 2250 2250 2250 2250 2250 SECI'. I 11LMP.
SEC, J,K TP.hlP.
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ERED AS I SIGNIFICA MPERATU E CHANG USED IN
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PII%rTEhll'LRAllJRES IVRTRANSIENI'IISIQGRAhIS-AUXILIARYSPRAY PIPI'. SYSTEhl NORMAI.Pl ANfCOO! DOWN (A): During Normal Plant Cooldown Operations U<erc is intermittent (low in thc auxiliary spray linc. At this time U<e auxiliary spray pipe has a liow condition of62 GPM for two. (2). minutes and shuts down for twenty, (20), minutes to zero (low. Stratification in pipe ace<ion is coa<crvatively assumed to exist forthis operation in thc pipe section I, CII.(F009-8CAA-2".TI<cre is a possigility Utat thc regenerative heal cxcl<angcr is not operating so various tcmpcraturcs are assumed and accounted for by PIJQff C:GODOWN (A),(II),and (Cl Conditions 33m 0
37 3
0 33 C
O I0 Nurnbcr ofCycks:
Pipe Section Refcrcncc Temp. F System Temp. F Delta Temp. F Pressure p<ig (low GPM I
COOLDOWN CONDITION(A)-40 cycles a
I B
C 435 375 365 365 365 365 365 SmATIFICATIONIS TO DE INCLUDEDIN PIPE SECflON I 400 400 400
=- 400 7'O IO IO IO IO IO INPUT F<ILE = inpl8 70 70 70 70 70 435 435 435 435 435 435 375 O
m Ox O
m 0
33 6)z 0
a 8
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REFERENCE - HISTOGRAM VH (0
Z0
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inp19 Pipl:"rEMI'ERAllIRESFOR TRANSIENI'IISTOGRAMS-AUXILIARYSPRAY Pll'E SYSTEM NORMAI.Pier COOLDOWN (B): During Nomlal Plant Coohiown Operations dtere is intermittent lIowin thc auxiliary spray linc. At this time thc auxiliary spray pipe has a liow condition of 62 GPhl fortwo. (2), minutes and shuts down fortwenty, (20), minutes to zero liow.Stratification in pipe section is conservatively assunted to exist forthis operation in thc pipe section I, CII EMIT.BCAA-2".Titcrc is a possibility tltat the regencrativc Iteat exchanger is not operating so various tctnperatures are assumed and accounted for by PLANI'OOI JM'tVN(A). (B)~ and (C) Ctuulilions 02Q 0
0)
GI mO Vt O
4i Im Number of Cycks:
Pipe Section Rcfcrcncc Temp. F Systcnt Temp. F Delta Temp. F Prcssure psig Plow GPM COOLDOWN CONDITION(B)- 92 cyc ks t
IIO 70 70 70 70 70 435 435 435 435 435 435 325 365 365 365 365 365 7~J IO 10 10 10 IO IO INPUT FILE = inpl9 REFERENCE - HISTOGRAM VII ALSrRATIPICATIONIS TO BE INCLUDEDIN PIPE SECrlON I 400 400 400 400 400 IIO 435 375 110 110 IIO 110 2MO O
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O PIPE'I7<hIPIWLTURES IrORlIPNSIEÃfIIISTOGRAh(S-AUXII.IARYSPRAY PIPI SYS'I'Ehl NORh(AI.PL<QKCOOUX)KVN(C): During Normal Plant Conh)own Operations there is intcrmittcnt flow in thc buxiliary spray linc. At this tin<c the auxiliary spray pipe has a liow condition of 62 GPM fortwo. (2), minutes and shuts down fortwenty, (20), minutes to acro t)ow. St ra < ilication in pipe ace<ion is conservatively assumed to exist for this operation in thc pilm section I, CII-F. 009-BCAA-2". )bere is a possibility that thc rcgencrativc heal exchanger is not operating so various trmperaturcs arc assumed and accounted I'or by PLANT COOUX)tVN(A), (B), a<<<l (C) Conditions 0D G)z 0
Number of Cycks:
Pipe Section COOUMtVNCONDITION(C)- 368 cycks B
O m
Rcfcrencc Temp. F System Temp. F Delta T<<mp. F I 60 435 275 70 435 365 435 435 435 365 365 365 70 70 70 70 435 365 435 275 160 O
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I O
Pressure psig TIIER STRATIFICATIONIS TO BE INCI.UDFDIN PIPE SECPION I 400 400 400 400 400 21~
Row GPM 71'O IO 10 IO IO IO 02Qz 0Zl INPUT ALE= i)IP20 O
3<
m I0z0 REFERENCE - HISTOGRAM VH O
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4 ANPP CALCULATIONS T
OALO TITI E AUXILIARYSPRAY LINETHERMALSTRATIFICATION CALO NP 13-'MC-ZZ-643 STRATIFIEDTHERMALANALYSISOF THE 2-INCH DIA.PIPE SHEET NO.
REV.
ORIGINATOR DATE CHECKER DATE REV ORIGINATOR DATE CHECKER DATE Rev.
Indi-XbMBE >.
STRESS
SUMMARY
FOR EFFECT ON 4X4X2TEE (DATAPOINT 7)
(Load Cases are per Class 1 Design Basis Calc. for 4x4x2 Tee documented in Ref. 6)
LOAD CASE MAX.STRE S INTENSITY S.I.
i BRANCH
'COMBINED inp12 inp13 inp14 inp15 inp16 inp17 inp18 inp19 inp20 6371 6370 6364 6370 6361 6372 6361 6356 6351 6687 6685 5211 6713 9457 7819 6692 6647 6602 13058 13055 11575 13083 15818 14191 13053 13003 12953 Maximum Stress is per inp16 and equals 6361+9457=15818 psi per ANSYS analysis.
1
ANPP CALCULATIONS T
CALC. TITLE AUXILIARYSPRAY LINETHERMALSTRATIFICATION CALC NO 13-MC-ZZ-643 STRATIFIEDTHERMALANALYSISOF THE 2-INCH DIA.PIPE SHEET NO.
REV ORIGINATOR DATE CHECKER DATE REV
'RIGINATOR DATE 'HECKER DATE Rcv.
Indi-T~BIJ>> 2 STRESS
SUMMARY
FOR EFFECT ON CHECK VALVETAPER TRANSITIONJOINTS (DATAPTS 51 4 52)
(Load Cases are per Class 1 Design Basis Calc. for Check Valve V431 documented in Ref. 5)
D inp14 5842 51 inp16 6632 51 inp18 9149 52 inp19 9154 52 inp20 9159 52 Maximum Stress is per inp20'and equals 9159 psi with SLY=1.9 per ANSYS analysis.
The base stress used in the code evaluation done in Section 5.0 is, therefore, 9159/1.9=4821 psi.
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