ML17292A611

Rev 0 to Pressure Locking Evaluation for RCIC-V-31.

ML17292A611
Person / Time
Site:	Columbia
Issue date:	07/12/1996
From:	Kelsow W WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML17292A609	List: ML17292A608 ML17292A610 ML17292A611
References
ME-02-96-23, ME-02-96-23-R00, ME-2-96-23, ME-2-96-23-R, NUDOCS 9612030158
Download: ML17292A611 (26)

Text

RESPONSE TO REQUESTER PLANT SPECIFIC CALCULATION This attachment does not constitute an LBD.

y Attachment 2 Page 1 of 16 .

BDC Page whsrrrrrctoN tusLfc towER SUPPLY SYSI.EM CALCULATIONCOVER SHEET NONE Equipment Piece No. Project Page Conrd On Page MIP 2 1.000 1.100 Dllsclpline Calculation No.

RCIC-Y-31, RCIC-MO-31 MEW-8&25 Quarty Class MECHANICAL Remarks c tmov<ileslrcictpjcajc.doc T1Ue/Subject PRESSVRE LOCKING EYALVATIONFOR RCjC-Y-31 Purpose DETERMINE THE OPEN THRUST REQUIREMENT FOR A POSTULATED PRESSURE LOCQNG CONDITION CAUSED SY PRE5SUREAT THE SUCTION LINE RELIEF VALVESET PRESSURE BECOMING TRAPPED IN THE VALVEBONNET; REVISION STATUS/ REVISION DESCRIPTION INITIATING TRANSMITTAL NO. F,PorS DOCUMENTS NO.

INITTALISSUE GL 85-07

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REVISION VERIFIED BY/DATE APPROVED BY/DATE PERFORMED BY/DATE NO.

JEFE ~AWds'u 96i2030i58 96ii25 PDR'DOCK 05000397 P ..fDR Study calculations shall be used only for the purpose of evaluating alternate design options or assisting the engineer in performing assessments.

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Attachment 2 Page 3 of 16 Page Cont'd On Page 1.100 1.200 Calculation No.

WhafBPICFON tubUC POWER CALCULATIONINDEX SUPPLY SYSTEM ME;02-8lo-23 Revision No.

0 PAGE No. SEQUENCE Calculation Cover Sheet 1.000 - t.ggg Calculation Index 1100 - troo Verification Checklist for Calculations and CMR's t.2go Calculation Reference List 1.300 - trot Calculation Output Interface Document Revision index " 400 - l.eo Calculation Output Summary 2 000 - agog Calculation Method, 3 000 - a.ooo Sketches 4.000-Manual Calculation 5.000-APPENDICES:

MATHCADCALCUlATlON Appendix A Pages Appendix B Pages Appendix C Pages Appendix 0 Pages Historical / Information Appendix H N/A Pages Superseded Pages Appendix S N/A Pages Appendix Pages Appendix Pages Appendix Pages 008.25ZTS R1 tSIQS)

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RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 4 of 16 This attachment does not constitute an LBD.

wA$8plcroN tUIUc towER VERIFICATIONCHECKLIST FOR N SUPPLY SYSIXM CALCULATIONSAND CMICE 1.200 1.300 Calculation/@MR verified using the following methods:

M- Revision ~ was Q Checklist Below Q Alternate Calculations Checklist item initial Clear statement of purpose of analysis Methodology clearly stated and sufficiently detailed and appropriate to proposed application Logical consistency of analysis

~ Completeness of documenting references

~ Completeness of documenting and updating output interface documents Completeness of input Consistency of input data with approved criteria Completeness in stating assumptions Validity of assumptions Calculation sufficiently detailed

~ Arithmetical accuracy

~ Physical units specified and correctly used Reasonableness of output conclusions Supervisor independency check gf acting as Verifier)

Did not specify analysis approach Did not rule out specific analysis options Did not establish analysis inputs

~ If a computer program was used:

Is the program appropriate for the proposed application?

Have the program error notices been reviewed to determine ifthey pose any limitations for this application?

Is the program name, revision number, and date of run inscribed on the output?

'f Is the program identified on the Calculation Method form?

so, is it listed in Chapter 10 of the Engineering Standards Manual?

Other Elements Considered Zevz

~ If a separate verifier was used for validating these functions or a portion of these functions, sign and initial below.

Based on the foregoing, the calculation is adequate for the purpose intended.

Verifier Signature{a) I Date Verifier Initials

lt < I 4 I[ ~ W $ JI, )I I $ 4 ', % 4 RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 5 of 16

~ This attachment does not constitute an LBD.

Con'I On Page 1.301 1.400 WASHWCTOM tUBLIC POWER CALCULATIONREFERENCE LIST SUPPLY SYSTEM ME-02-9&23 Reialon No.

ISSUE DATE, DOCUMENT'O.

SEQUENCE AUTHOR EDITION TITLE NO. OR REVISION Gcc Rcfcrcnccs Scctlon of A cndtx A . L

RESPONSE TO REQUESTER PLANT SPECIFIC CALCULATION

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Attachment 2 Page 6 of 16 Con1cn Pspo WASHOIC1ON tUSLlC tOWER CALCULATION 1.400 2.000 SUPPLY SYSTEM OUTPUT INTERFACE DOCUMENTS REVISION INDEX ME-02-98-23 7/11/98 ~

Prspatod By I Oatn VenAo4 By I OSI ~ Reislon Ha

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The below listed output interface calculations and/or documents are impacted by the current revision of the subject calculation. The listed output interfaces require revision as a result of this calculation. The documents have been revised or the revision deferred with Manager approval, as indicated below.

CHANGED BY CHANGE DEFERRED DEPT.

AFFECTED DOCUMENT NO.  : BDC SCN CMR Rev. RFTS NO. MANAGER' None Re uired for deferred chan esonl 088 26286 (SI03)

y t' RESPONSE TO REQUESTER PLANT SPECIFIC CALCULATION

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Attachment 2 Page 7 of 16 Page Con't On Page wAs)GNGTQN FUEL)c pou/Ea 2.000 S OOO CALCULATIONOUTPUT

SUMMARY

N SUPPLY SYSIXM Ca)ouht)on ))o.

ME-02-98-29 Discuss)on o) Resuits Revision No.

0

1. TME TOTAL REQUIRED THRUST'TO OPEN RCIC-Y-31 NTH THE VALVEPRESSURIZED TO 118 PSIG IS 1024f LG.

2. THE ACTUATOR OPEN THRU5T CAPAGILI7YIS 13,~ LO . (310% POSITlVE THRUST MARGIN)

3. 7HE MAXIMUMPREFERRED ST'ATIC UNSEATlNG LOAD I5 9 948 LS TO ENSURE THAT'THRUST'LIMITATIONSOF THE VALVEOR ACTVATORARE NOT EXCEEDED, Conc)us)on s RCIC-V-31 REMAINS OPERAOLE UNDER THE POSTULATED PRE55URE LOCKING CONDmONS.

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RESPONSE TO REQUESTER PLANT SPECIFIC CALCULATION

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Attachment 2 Page 8 of 16 Page ConTd On Page WASIIRICZON PIIELIC POIFER SUPPLY SYSIKM 3.000 Appcndbc A CALCULATIONMETHOD ME-02-98-23 Ptapaead bytoata Varttted bytData Itevtaton Ho.

JE FELLMAN u>V98 tnatyata Method (chaott appropriate boxee)

[g Manual (As required, document source of equations in Reference List)

Q Computer Q MainFrame Q Personal Q In-House Program Q Computer Service Bureau Program BCS CDC PCC Q Other VelTTied Program: Code name/Revision Q Unverified Program: Document in Appendix B Apptsaeh/Methodotogy REV.

BAR THIS CALCULA7)ONJS SASED ON THE METHOD PRESENTED IN THE PROCEEDINGS OF THE SORKSIIOPON GATE VALVEF'RESSURE LOCKINGAND THERMALBINDINGHELD SY THE NRC FE8. 4, 1994; NVREGICF'-Of@8. 7HE METHOD DIRECTLYAPPUES THE EQUAT)oNS coNrAIHED IN THE 57H EDlIJDN oF RDARK 4 Y0UNGs F0RMUlAs F0R STRESS AND STRAIN, REF. 8.

THE TOTAL REQUIRED THRUST FOR OPENING ANYVALVEs UNDER PRE55 URGED SONNEf CONDJT)ONS, JS DEPENDENrON THE FINAL WEDGING FORCE FROM THE PREVIOUS CLOSING CYCLE. FORA GIVEN TORQUESWIrCH SEl7JNG, 7HE WEDGIIJG FORCE CAN VARY SECAUSE INERTIALOVERSHOOT JS AFFEClED SY THE MAGNlllIDEOF 7HE DIFFERENrIALPRE5S URE ACROSS THE DISC. 7YPRALLY, THE HIGHEST WEDGING FORCE WOULDSE INTRODUCED WHEN THE VALVEJS CLOSED WIIHOUrDIFFERENTIALPRESSURE THIS CALCULATUN CONSERVATIVELYQUANOFJES THE UNIIEDGINGFORCE SASED ON AN ~4 AS TESTEDUNIVEDGINGFORCE UHDER SrATJCCOHDIMNSs AND GIVEN SONNET PRE55URE AND UP57REAM AND DOyrrNSTREAMEXlERNALPRE55URES.

THE CALCULAT)ONALSO MODELS A WEDGE PISTON EFFECr FOR FLEX WEDGE GATE VALVESWJIERESY LOWER EXTERNALPRESSURES 7HAN THE INTERNALSONNEr PRESSURE CAN RESULT'IN A NEr POMlVARDFORCE MJCH OPPOSES 7HE 5TEM PISTVN EFFECT.

CDNvERsELY, HIGHER ExlERNAL PREssUREs cAN RESULTIN A NEr UPwARDFDRcE. THE NEr FoRcE J5 EllHER PosmvE oR NEGAT)vE IN THE OVERALL DETERMJNAT)ON OF THE FORCE REQUIRED TO OPEN THE VALVE.

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RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2

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RC3 IPLR02vfCD w~~~tx 4 7N/96 CALCULATIONME4 -9 V.O Prepared By:

VeriGed By:

OPENING THRUST CAPABILITYCALCULATIONFOR RCIC-V-31; SUPPRESSION POOL SUCTION VALVETO RCIC PUMP UNDER POTENTIALPRESSURE LOCKED CONDITION Wetwell Chamber Pressure WW P:= 0 psig Assumed Elevation Head on Valve, Wetwell Side V EHW:= (466- 453) 0.433 Rcf. 2, pg. D-28 (due to minimum WW level) V EHW =5.6 psig Elevation Head Gem Relief Valve to Valve V EHRV:= (453- 431) 0.433 Ref. 2, pg. D-27/8 (relief valve is below RCIC-V-3 I) V EHRV =9.5 psig Internal Bonnet Pressure (relief valve sctpoint) PB:= 125.5 - V EHRV psig Ref. 2, pg. D-28" Suction Pressure P CST:= (448- 426) 0.433 Ref. 19,20 (CST head, keepfull pump oII) P CST =9.5 psig Valve Open Pressure. V OP:= WW P psig Mean Seat Diameter MSD:= 8.17 in Rcf. 4 Valve Hub Radius H R:= 3.38 in Measured Poisson's Ratio for carbon steel v:= 0.30 Ref. 7,p546 Valve Seat Angle (degrees), 0 (radians) VSA:= 50:= VSA-.01745 0 =0.1 Ref. 4, DR-1078, pg. 82 Measured Static Unwedging Load SUW:= 7646 Ibf Ref. 13 Measured Unwedging Load Reading Error SUW re:= 0.104 Ref. 13 Measured Unwedging Load Full Scale Error SUW fsc:=0 Ibf Ref. 13 Stem Diameter SD:= 1.625 in Ref. 10 Measured Running Load RL:= 441 Ibf Ref. 13 Measured Stem Coeflicient ofFriction It:= 0.0863 Ref. 13 Measured Valve Factor VF:= .6. Ref. 13 Degraded Voltage DV:= 0.8 Rcf. 14 Tlneads Per Inch TPI:= 4 Rcf. 15 Thread Starts (Lead x TPI) TS:= 2 Ref. 15 Motor Speed MS:= 1900 rpm , Ref. 15 Unit Overall Ratio OAR:= 362 Ref. 15 Motor Torque MOT TQ:= 15 It-Ibs Ref. 15 Torque Loss 250 F MOT TQ loss:= 0.0 Ref. 16, Att. 6.3, pg. 3 Torque Loss Temperature TLT:= 250 F Ref. 16, Att. 6.3, pg. 3 Minimum Ambient Temp. for Torque Loss ATL:= 104 F Rcf. 16, Att. 6.3 Am. 93-14 Pullout El5ciency PO elf:= 0.4 Ref. 16, Att. 6.5, Am. 9345 Run EIIiciency RUN elf:= 0.5 Rcf. 16, Att. 6.5, Am. 9345 Stall EIIicicncy STALL cff:= 0.6 Ref. 16, Att. 6.5, Am. 9345 Operator Thrust Limit (162%) OTL:= 22680 Ibf Ref. 168k 17 Valve Open Thrust Limit VOL:= 25167 lbf Ref. 11 Max. Operating Temp. T max:= 220F Ref. 8 Gear Rating GR:= 250 It - Ibs Ref. 17 Measured Stem Factor SFM:= 0.0123 Unseating, Rcf. 13

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RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 10 of 16 This attachment does not constitute an LBD.

RC31PLRO.MCD CALCULATION~2-96-23 RKV. 0 Prepared By:

Verified By:

~W'tQgP:

1) Detenninc the operability of the valve with the bonnet pressurized to suction line relief valve set pressure with a 5% stem factor degradation. The motor operator should have sufficient capability to open the valve with the bonnet pressurized without exceeding the thrust limitations of the valve or the operator.

2) Determine the maximum prcfencd static unwcdging force with a 5% stem factor degradation to provide increased assura'nce that the valve or operator open thrust limitwin not bc exceeded.

BtaRHBaL:

1) WNP-2 Pressure Locking and Thermal Bindiag Report, WPPSS-ENT136, December 29, 1993.

2) RCIC System MOV Design Basis Review, C106-9243.05.

3) PPM 2.4.6, Reactor Core Isolatioa Cooling System

4) QID 361701

5) EPRI Perfonnance Prediction Program, EPRI TR-103119

6) Formulas for Stress and Strain, Roark and Young, 5th Edition.

7) Handbook of Engineering Fundamentals, Eshbach, John Wiley and Sons, 1969.

8) QID 221001

9) NUREG/CR-5807, Impmvements in Motor Operated Gate Valve Design aad Prediction Models for Nuclear Power Systems.

10) CVI 4 1 A40P3

11) Weak Link Calculation, 216-92453, CMR 964234

12) Limitorque SEL-3

13) RCIC-V-31 MOVATSTest WO NAP3465, test date May 25, 1993.

14) Calculation E/I 02-9242.

15) Calculation ME42-92-150, Rev. 0, CMR 944018

16) MES-10; Limitorque opemtor can withstand a one time thrust overload of up to twice the nominal rating or up to 162% for 2 cycles.

17) Limitorque Selection Pmcedure, SEL-7.

18) NUREG/CP4146, Workshop on Gate Valve Pressure Lochng and Thermal Binding, Feb. 4, 1994

19) Instrument Master Data Shet, RCIC-LS-15A, LOW LOW CST Level causing RCIC-V-31 to open

20) CVI 21540-3195, RCIC suction piping isometric

1) The absence or existence ofa vapor pocket in the bonnet does not change the total required stem thrust to open the valve.

2) External pressure on the disc willnot reduce the static unwcdgiag load.

3) Assume the static unwedging load is directly additive to the differential pressure dynamic load due to bonnet pressure.

4) Running load is assumed to remain constant over the interval between baseline tests. Ruaning load is accounted for indirectl since running load is included in thc measured unseating load and the measured unseating load is added directly to the calculated pressure locking load in determining the required thrust to opea

5) The CST is at the low level switchover point, RCIC keepfull pump is not running, and the wetwell is at atmospheric pressure.

This will create the largest diQereatia) pressure across each side of the disc when the bonnet is pressurized to the suction line relish'alve set pressure minus elevation head.

RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 11 of 16 This attachment does not constitute an LBD.

RC3 IPLRO.MCD CALCULATIONME-02-96-23 REV. 0 Prepared By:

VeriQed y:

5K IJlKK: 'n culate e ed theseat thedscduetoint usin e ce able 24 ase 2d.

a:~ 0.5.MSD b:= H R q i:= PB ro:= b a~4.1 b~3.4 q i~116 ro=3.4 C2:= 025 I -

L

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1 +2 In- C2 =0.014 b -I C3:~ + I In + C3 =0 4a 2

b C8:= 0.5 1+v+(I v) C8 =0.9 a

C9:= - -

In + I 2

C9 =0.1 2 4 2 2 LI I:= I + 4 I ro 5 - 4 ~

2+ ln LII =0 64 a L17:=0.25 I- I-v 4

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I - - ~

I + (I + v) In L17 =0 Determine the force on the perimeter of the disc hub (Qb i, Ibfin)

I

. a (C2 L17 - C8 LII)

Qb t:=q t Qb i =54.4416 C2 C9 - C3 C8 Determine the force on the perimeter of the disc (Qa i, Ibfm) at the seat ring Qa t:= Qb t - ~

a - ro Qa i =-29.6604 a

Case 2d for Internal Pressure

RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 12 of 16 This attachment does not constitute an LBD.

RC31PLRO.MCD CALCULATIONME'A2-96-23 REV. 0 Prepared By:

VeriGed By: rC t 'the forckse krted a rkssurcs on k hi ure side and on the low ressure side usi eference able 24 Ca e 2d and Case b WW side:* V OP+ V EHW PUMP side:= P CST q h:= if(WW sidezPUMP side,WW side PUMP side) PUMP side =9.5 q I:= if(WW side<PUMP side,WW side, PUMP side) WW side =5.6 q h=9.5 q 1=5.629 Determine the force on the perimeter of the disc hub (Qb h, Ibfm) due to the high pressure side a (C2 L17- C8.LI I)

Qb h =4.4718 C2C9-C3 C8 Determine the force on the perimeter of the disc (Qa h, Ibfm) at the seat ring due to the high pressure side Qa h:= Qb h -

a 2a (a -m j Qa h =-2.4363 Determine the force on the perimeter of the disc hub (Qb I lb') due to the low pressure side a (C2.L17 - C8 Ll I)

Qb I ~2.6424 C2C9- C3 C8 Determine the force on the perimeter of the disc (Qa I, Ibfm) at the seat ring due to the low pressure side Qa I:= Qb I a ro Qa I =-1.4396 the force on the perimeter of the hub (W hub, Ibfm) due to the differential pressure over the hub area

'etermine (q h-q I) xb W hub =6.5859 Determine the differential force on the perimete of the hub (W hub h I, Ibfm) due to the high and low pressure side, which excludes the hub area.

W hub h I:= Qb h-Qb I W hub h 1=1.8294 Determine the total differential force on the perimeter of the hub (W hub bF, Ib/in)

W hub dF:= W hub+ W hub h I W hub bF =8.4153

RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 13 of 16 This attachment does not constitute an LBD.

RC31PLRO.MCD CALCULATIONME@2-96-23 REV. 0 Determine thc force on thc perimeter of the disc (Qa dhl, Ibfin) on the low pressure side duc to the external differential pressure.

Qa deal:~ 0- W hub N a Qa ~ ~-6.963 t ine e eac seat 'n duetothefour sureloadin co ditions Determine the ring load on the high pressure side (Qr h, Ibfin)

Qr h:= Qa i- Qa h Qr h =-27.2241 Determine the ring load on the low pressure side (Qr I, Ibfin)

Qr I:= Qa i - Qa I+ Qa ~ Qr I =-35.1838 Determine the total disc force on the high pressure side (F h, Ibf)

F h:= x MSD Qr h F h =%99 F h:= if(F ha0,(-1) F h,F h) F h =-698.7571 Determine thc total disc force on thc low pressure side (F I)

F I:=xMSDQr I F 1=-903 F I:= if(F IaO,O,F I) F 1=-903 Ibf Determine Disc Area (DA, in"2) 2 x.MSD . 2 DA:= DA ~ 52.4 in 4

DF:i VF DF =0.6 ct e e total re i b Determine thrust required due to pressure only (RT~, Ibf)

RT~:= (F I+ F h) DF RT~:= if(RT~>O,RT~, (- I) RT~) RT~ = 961 Ibf

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Attachment 2 Page 14 of 16 RC31PLRO.MCD CALCULATIONME@2-96-23 REV. y I'relied By:

Verified By:

Determine Stem Piston Effec (SPE, lbf)

Determine Stem Area (SA, in"2)

SD SA:~ sc 4 SA ~2.1 Calculate the Stem Piston Effect SPE:0 SA PB SPE ~241 Determine the Net Wedge Piston Effect (NDPE, lbf)

Determine the top half of the projected area of one of the discs only due to the angle of thc wedge (PAT, in"2)

'Ihe top width TW:= MSD sin(0) TW =0.7 The projected shape ofthe wedge area is an ellipse.

PAT:= x 0.5 MSD 0.5 TWPAT =4.6 Ref. 7, pg. 2-56 Dctenniae total projected area that would result in a downward force from internal bonnet pressure (IPAT, ia"2). TPAT also represcats the area over which the up@md forces from external disc pressures would act.

TPAT:~ 2.PAT TPAT ~9.1 Determine thc Internal Wedge Piston Effect (IDPE, lbf)

IDPE = TPATPB IDPE = 1060 Determine the External Wedge Piston Effect for the high pressure side (EDPEH, lbf)

EDPEH:= PAT q h EDPEH =44 Determine the External Wedge Piston Effect for the low pressure side (EDPEL, lbf)

EDPEL:= PAT q I EDPEL =26 Determine the Net Wedge Piston Effect NDPE = IDPE - EDPEH- EDPEL NDPE ~ 990 Determine the corrected Static Unwedgiag Load (SUWC, lbf)

SUWC = 8533 SUWC;=

I- SUW re + SUW fse TOTALREQUIRED THRUST TO OPEN (RTO, lbf)

RTO:= SUWC+ RT~ - SPE+ NDPE RTO = 10244 6

RESPONSE TO REQUEST R PLANT SPECIFIC CALCULATION Attachment 2 Page 15 of 16 This attachment does not constitute an LBD.

RC31PLRO.MCD 7/8/96 CALCULATIONMFA2-96-23 REV. 0 Prepared By:

VeriGed By:

OP C lb Determine Stem Factor (SF, ft)

TS TPI TANa:= TANa =0.1 K SD- 0.5 SD .5 I

(.96815 TANa + p)

SFI:= SFI =0 24 (.96815 p TANa)

SF:= if(SFM>0, SFM, SF1) SF =0 Determine Torque Loss at Max. Operating Temperature (IL) i:= 1..2 OT TQ loss TL:= Iinterp(vx,vy, T max)

Determine Motor Start Torque (MST, ft-lbs)

MST:= MOT TQ (I - 'IL) MST ~ 15 Determine Reduced Voltage Factor (RVF)

RVF:= DV RVF =0.8 DC motor Determine Pullout Torque (POT)

POT;= MST OAR PO efrRVF POT = 173.8 ft - lbs POT:= if(POT>GR, GR, POT) POT ~ 173.8 ft - lbs OPERATOR OPEN 'IHRUST CAPABILITY POT OTC:= OTC = 14127 SF lbf MARGIN:= OTC - RTO MARGIN = 3882

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RC31PLRO.MCD CALCULATIONME-02-96-23 REV. 0 Pngmred By:

Verified By:

TO RAD 0 C OTCI:* POT SF 1.05 OTC I = 13454 Ibf S C ING RC S T LM:= if(VOL>OTC,OTC,VOL)

T LM:= if(T LM>OTL,OTL,TLM)

T LM:= if(T LM>OTCI,OTCI,T LIM)

T LIM= 13454 Ibf VOL =25167 OTC1 =13454 OTL =22680 MSUW:= SUWC - (RTO - T LIM)- 1000 - SUW fse - SUW SUW re MSUW =9948 Ibf T LM=13454 RTO ~ 10244 SUWC =8533 SUW fse=0 SUW =7646 SUW re ~O.I C C SIO I) The highest total required thrust to open@TO = 10244 Ibf) is less than thc operator capability with 5% stem factor degradation ( OTC1 ~ 13454 Ibf). Therefore, the valve is capable of performing its safety function with a bonnet pressure of PB ~ 116 psig, pumpside prcssure ofP CST ~9.5 psig, and wetwell chamber'pressure of WW P ~0 psig.

2) The maximum prefened static unwedging force was determined to beMSUW =9948 Ibf The measured static unwcdging force of SUW =7646 lbf is less than the maximum preferred value.

The maximum preferred unwcdging force ensutes the calculated required ttuust to open wiH not exceed the thrust limitations of either the valve or the operator with a 1000 Ib margin.