ML20199L848

Rev 4 to M-52-31, NPSH Analysis Core Spray Sys

ML20199L848
Person / Time
Site:	Limerick
Issue date:	01/15/1998
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20199L838	List: ML20199L833 ML20199L841 ML20199L848
References
M-52-31, M-52-31-R04, M-52-31-R4, NUDOCS 9802100044
Download: ML20199L848 (21)

Text

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4 ATTACHMENT 2 Limerick Generating Station Unit 1 NPSH Analysis Core Spray System t

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RESP HGR YES ECR # I/r 97-03056 Rev.

d CALCULATION REVIEW CHECKLIST MANUAL

- CCMPUttR CE CA 111,gt.jfL4 X

X Calculation is the appropriate basta for the activity M

X X

Calculation assunptions, conalderations, and methodotony conform to

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applicable design requirements

/

X X

sources of data and forerules were reviewed and verifled to be correct and

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input data is correct and used property

- /Co X

the analytical method used in the calculation has been considered and is proper for the intended use X

Mathematical accuracy has been checked and is correct (indicate method k

used) a)

Complete check of each calculation M

b)

Spot check of selected calculations c)

Performance of alternate or approximation calculation (attached)

R X

X Calculation results were checked against applicable design criteria ard A

vere found to be in cceptience

/

X X

taisting calculations requiring revision as a result of this calculation N/A have f een identifled and docunented X

The analytical methods described in the cceputer calculation sunnery are N/A proper f or the intended use X

X ALL system and topic rutaers associated ulth the calculation are listed M

X Computettonal securacy has t<en checked and is correct (Indicate method

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Used) 6)

Check sample calculation using data other than that used in the

.N/dl sempte b)

Ferformance of atternate or approximation calculation (attached)

N/M c)

Describe other method usedt N/A X

Program used is appropriate, input is valid, and output is reasonable M/8 considering the input X

X 6ese calculation has been reviewed against current drawing revisjona and Y4 posted DCDs to identify significant differences The criteria listed above are the minimum criteria to be considered and are not intended to limit the initiativo of the reviewer to consider other criteria.

Attributen applicable to manual and computer calculations are noted by an "X"

in the appropriate column, List the documents used to support this review. OhW4ko/dth++ud e'8 v-a-//tWwb "'b) @ A00283~ ctkt/

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Effective Date: 9/4/94 p,g,gg % Y {

CALCULATION COVER SHEET a

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CALCULATION COVER SHEET 6'd U C J'

emosict _ Limerick Ge:1. Station Unit I & 2 sos so, 8031 oiscieuN Mechanical

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M MMM reviewed.

cALCUL Afl0N $CR[FNING FOR THE A$. BUILT Ot$1GN til the purpose of this calculation revision is to document that the calculation results ch and conclusions are still applicable to the al. built design of the plant including modifications.

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@ Reviewer has determined the calculation results and conclusions are applicable y

to the as. built design of the plant because

/ the original design margin was large and subsequent modifications have had O

little or no irnpact on the design margin.

there have been no rnodifications to the system which ef fect this calculation.

he pre.op tett results (as adjusted to agree with calculation assumptions, where appropriate) are consistent with the calculation and subsequent mods have not significantly affected the calculation results.

Other:

e C Reviewer has determined the calculation results and conclusions are no longer applicable to the at-built design of the plant because the Calculation design margin has already been exceeded.

Other:

[ Reviewer cannot determine that the calculation results and conclusions are applicable to the as.tsvilt design of the plant in the time available. Further technical evaluation is recomended.

pefertoSheet [20-for a list of MDCPs. DCPs. design decurnents and pre.op test results that were reviewed during the calculation screening revitw.

Utilltation of thle calculotton by pe rsons, without access to the pertinent lectors and without prope t relatd f or its purpose, could lead to erroneous conclusto64.

Should it tecome necessary to use any of shts calculation in your votit in the futute. It to suggested that the calculation be reviend with authottled bec14t:1 personnel, to ensure that the rutpcoes, assumptions judgments and limitations are l thoroushly unde rstood. techtel cannot as.ame teeponsibility f or the use of cal.

.culations not unde r est direc t cont rol.

see testo, noy 8/ES H' a ' 1 C

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DESCRIPTION BY DATE CHKD DATE APPRO DATE g

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CEC. e M U-31 RCv.

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g, CALCULATION REVIEW CHECKLIST MANUAL COMPUTER YES or N/A S.hl8.1 Shl8 t.

X X

CECUuTION 39 THE APPROPRI ATE LASIC FOR THE ACTIV37Y Y

X X

CAteULATION A$sVHPT30Ns, Cotas!DERATIONS, AND HETHODOLC0Y CONFORN to Y

APPLICALLE DE$3CN REQUlkEMDiT3 X

X COURCts Or DAu MD FORMULAS WERE REVIEWED AND VERIF3tD T0 bt CORRECT AND COMPLETE X-X INPVT DATE la CORRtCT AND USED PROPERLY Y

X THE ANALYTICAt HETLOD USED IN THE CALCULATION HAS SEEN CCHS3DERtD Y

AND 19 PROPER ron THE INTDIDED USE X

HATHEMATICAL ACCUAACY HAS &LEN CHECKED AND 38 CORRECT {3NDICATE Y

HETH00 USED)

A)

COMPLETE CHECK Of LACH COMPUTAT]CN Y

8)

SPOT CHECK OF. SELECTED COMPUTAT30NS A44 C)

PERrQRMANCE OF ALTEMATE OR APPROX 3 MAT 10N C4CUMT30N W

l (ATTECHED)

X X

CECUMT30N RESULT 3 WERE CHECKtD ACA1NST APPs1 CABLE DE31CN CRITERI A

,,,,,(

AND WERt FOUND 70 St IN COMPL1ANCE X

X EXISTING CALCULAT30tJS REQUIRING REV2810N AS A RESULT OF TH18 Y

CALCULATION HAVE BREN 3DENTIT3t0 & DOCUND4TED X

THE ANALYT3 CAL HETHODS DESCR28tD IN THE CCHPUTER CALCULAT30N M8 SUH4ARY 38 PRorER FOR THE 1NTENDED U$t X

.Y.

ALL SYSTEM AND TUP!C NUHttRS ASSOCIATED WITH THE CALCULAT30N ARE Y

LISTED X

COMPUTATIONAL ACCURACY HAS BEEN CHECKED MD 38 CORRECT (INDICAft NN NtTHOD U$tD)

Al CHECK SAMPLt CALCUMT10N USING DATA CTHER THAN THAT USED IN Md THE SAMPLE 8)

PERFORKANCE OF ALTERNATE OR APPROXIKATION CALCULAT30N (ATTACHED)

C)

DESCR1st OTHra HtTHDD USEDI 8

t X

PR0 CRAM U$tD 1$ APrROPRIATE, INPUT IS VALID, AND OUTPUT IS A8 4 KCASONABLE CONSIDERING THE INPUT X

X BASE CECULATION MAS BEEN REVIEWED AGAINST CURRENT DRAWING Y

REV1510NS AND POSTED DCDS 701DENTITY $3CN173 CANT DIFTERD4CES The criteria listed above are the minimum criteria to be considered and are not intended to limit the initiative of the reviewer to consider other criteria.

Attributes applicable to manual and computer calculations are noted by an 'X' in the appropriate column.

List the documents used to support this review.

M

• 8 8 ' I - C00 8

• Jli.

M.l. t 10 tot o s c.. (

C sq Te d ls. \\

P n.

410 REVIEWED BY:

d I DATE:

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_ REV.No. 3 onioiNArop. 6. S. kA N Lo N I la l>/90 -__ CHtexto oatt M

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vnostcr LlMskick Gen. 6 rstron IS2 son no, _ 801I sunstc,_ Conc 5 PRAY NP.sHA C ALCUL ATloN& ~ Tve sHerr No.

Z 2. ""Y

• b\\

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' PUMP RukouT The following HDCPs, OCPs, Design Documents and Pre-op Test Results wt.v 2

reviewed:

j 3

11 0 C P OCP DE51Gli FRE OP d

Util f 1 UliI f 2 Ulij f 1 Util[ 2 00CUMEllTS TEST RESul.TS

(

5 gS-ol7f so tq - ?-

249 63 i

SG-0376 2.067 546!

(to SS-0 679 2ecof

((co E S- 0 642.

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CALCULATION SHEET Yt AM+4AP-h / 5 f/W 4.M. % rAA/GC41

/1/L4 /## k CALC. No.

M-52-31 REV. NO.

1. 2.

OR*IGINATOR Sklo Denny DATE 12/02/88 CHECKED Ma idhug DATE /1 1

• Pt PROJECT Limerick Generatina Station Units 1 and 2 JOB NO.

.8031 ECT core Borav NPSHA Calculations - Two Pumo Runout SHEET NO.

2

1. ce: roa rev.uou 4 Nesceu

't. acsoets, us pce%,Rcws..a4 c ue.um a.r.

s maa ou nus

,o muoc a s't,

j I.

Purpose To calculate the net positive suction head available (NPSHA)- from the suppression pool to the worst-case core spray pump, for the worst case conditions expected during the plant life, for I

comparison with the design NPSH required. IN Aopme$h iM NPSHA TMS MAus14 45 c4ccourst Msro os Tw 4<,.,vm ce n.rt s p 4 w tw.

P4rssow NeP.

6%

NI.

References M

A.

Crane Technical Paper No. 410, 21st printing, 1982 C3 B.

Process Diagram 8031-M-1-E21-1020-G-1.3

.. -...'U... N. Y.. m..N.'m..M.~.MC. Y Sff p+15 C.

,. m.,

p m

a

.av n...

Secesei w noaJ (9 4. et4 '.- Sucnca sees j

i gn D.

MechanicalCalculation8031-Misc-62,Rev.K b

cb E.

Bechtel Pipe Isometrics P'

1.

HBB-120-1 Rev. 22 9.

HBB-220-1 Rev. 12

~

2.

HBB-120-2 Rev.

9 10.

HBB-220-2 Rev.

8 3.

HBB-120-3 Rev. 20 11.

HBB-220-3 Rev. 11 o

4.

HBB-120-4 Rev.

9 12.

HBB-220-4 Rev. 10 o

5.

HBB-120-5 Rev. 21 13.

HBB-220-5 Rev.

7 6.

HBB-120-6 Rev.

9 14.

HBB-220-6 Rev.

7 7.

HBB-120-7 Rev. 22 15.

HBB-220-7 Rev.

7 8.

HBB-120-8 Rev.

9 16.

HBB-220-8 Rev.

7 F.

Bechtel Piping Specification 8031-P-300 to Addition 2 to Revision 33 G.

Anchor / Darling double Disc Gate Valve Catalog, Drawing PD-026 Rev. 1, dated 6/1/78 H.

Hydraulic institute Standards, 13th edition, 1975

'f.

E SPA.Ay Reme ICR FOR.M Aek C *i~e5T (. awe (rR. ),[V. F. /f #05 '- M l -li I '" b III. Resu to y,

93,c, gg, gg,g, oog3 7, ggy f g g ms

,, p o d W.i n.<

,,, nu.o The net positive suction head available (NPSHA) is 45.5 7'705 feet, which is greater than the net positive suction head requi e (NPSHR) o f -1frre-f eet.

Therefore the system suction lines are

'/

ADEOUATE.

Id O 1140~ to' tJPw & IS Potus FM r Mb is nte A<,v nt. vruc c~ supeu en q

)

M ftst~ fv M V CWDOPs. ATT' S, No ni 6 Sfet s inn a N t* H PS t4 f

w, e i s.2: i t er m - e.

rm, mu,-r i s swu mm (Hsco DJ Mvtnu% AtocwMa Lc pie,m ShtM u m,, FAr35vu-W.cF.* int 4.eT W n,v se suc nw uu r, w ww.

mt upse %J tmser, dal NT*

Af.,Wht CI A. N Sf*4W E'82 NE55v4 F DLO P

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j j

'I CALCULATION SHEET

/R M. d TM(7(.44. /f/24 /F4 k C

1 5

31 EV. )

1' 2 '

ORIGI!!ATon Skin Denny DATE 12/02/88 CHECKED M M MM% DATE 12. 1 9+

PROJECT Limerick Generatina Station Units 1 and 2 JOB NO.

8031

• • • )J ECT Core Sorav NPSHA Calculations - Two Pume Runout SHEET No.-

3 XV.

Assumptions g

A.

Pressure drop across &c ;;27,;IP strainer e a Lai3 is no greater than Marte per Referencte CeMo accew 7.

yms

/

9.L h

• S.n vs.d (Ses air > yefc7, <yp i

p D.

Suppression Pool elevation is at w00.0.57 feet, which is the La minimum expected pool elevation af ter pool draw-down, per y

g Reference DLZBA ett (opp.teunk, < ant W) n C.

Single pump flow is at runout condition of 3950 gpm, per Reference D.

to D.

Suppression Pool temperature is at 212 deg F, per Reference B, N

which is above the peak expected pool temperature for any accident sconario.

This is conservative, since water density n

decreases with higher temperature, and thus will NPSHA also tn decrease with higher temperature.

Although viscosity decreases with higher temperature, and so turbulence will ch increase and the friction factor decrease, this is a much smaller impact on NPSHA than that of density.

Ancluae uv4ussini M E.

see used aL Lho ualu.& suay gp, p1thqhtho W

M e"-h fler:__J The friction coef ficient for the tee branch is o

calculated as a normal full flow tee branch 40 is ccenne M

e etws c4Mm e (A Tws MAa c4W.

y F.

The penetration length is assumed to be 15 feet.

The actual penetration is much less than 15 feet.

G.

The total straight length of suction piping for any of the

' eight unit 1 and unit 2 core spray pumps is assumed to be 66 feet by bounding the summations of the straight lengths (including fitting lengths) for each pump, assuming 15 feet for the penetration (Assumption F).

H.

Pipe Aging is considered by calculation the friction losses for the straight length sections of pipe under new pipe conditions and adding an arbitrary 40% margin.

This margin is not added for fittings or the strainers.

p

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CALCo 1100 _M-52-31 REV. 110.

1 OSIGIllATOR Skin Denny DATE 12/02/88 CHECKED 641 PJ4+NA.DATE. / 2 o 2. Fi{

PROJECT Lin arick Generatina Station Units 1 and 2 JOB No.

8031_

53J ECT Core Scrav NFSHA Calculations - Two Puno Runout SHEET No.

4 4

V.

Theory and Equations Unless otherwise stated, reference for the following is Ref. A a y M

f, =.013 for 12 to 16 inch pipe.

T

+ b I's man.

cck A.

NPSHA = 14 4

• Qg - PA + (E3-E)- 2.59115E-3'*%

Ref.'Ti rho d

[D.

K(Strainers) dP

• d' Eqn.3-1k

=

n f

1.80086E-5*r I

p.,,

m where dP

= 2.

d=

inches l

r

• 62.4 lbm/cuit

+- Ref. C N

Q

= 3950 gpm l

C.

K(Straight Pipe) = (1 + 40%)

• 12

• f

• L / d tn D.

K(Gate Valve) = 89 0. 60384

• d' / C[

Eqn.

• ,-16 c.

E.

K(90 deg elbow) = U

• 14

• f, (90 deg butt welding J'

elbow with r/d = 1.5)

F.

K(45 deg elbow) = H

• 5.82

• f, o

o where (0.25*pi*f r/640.5*K) +K Ref. A pg A-29 K = (n-1)

• n = number of 90 dog be,*G7 u and n

O r/d = 1.5 and K-=

14

• f, then K = (0-1) *

( 0. 2 5

• 3.14

• 1. 5 *f,+ 0. 5

• 14 *f,) + 14

• f, 5.82

• f,

=

G.

K(Tee Branch) = N

• 60

• f, H.

.K(Tee Run) = N

• 20

• f, I.

K(Total) = sum ( Ks )

3R

• 't. L Pr = 3. 6 2. ess R 3'l50 3rs C.1\\ a..S 9 RW C-V

/ktr M Amue Due row nw Nw hm dmwm h g

( q c.

Is bn w '04 3'KO 61% M 2n. S 'i;. Rtc D S'F O m ot w vtr bWtTA W h ? M$ 6% oAMb Dtf $JffLctS,cd fen %

Tv'** ft W A4V LC' c F.

we o em.o-mm, w oun ca nw ima,n,w c wm In e /WM G 6f7t4CIN 111

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CALCULATION SHEET Gs rJ w

!*P4/w AM, d rMWl, /3/2f/##

CALC. NO

-B2-31 REV. NO.

Y2 ORkGINATOR Skin Denny DATE 12/02/88 CHECKED #+4( AJa+ovah DATE /E - t - fHF PROJECT _ Limerick Generatina Station Units 1 and 2 JOB NO.

8031

~ 7 JECT _ Core Snrav NPSHA Calculations - Two Pumn Runout SHEET No.

5 l

VI.

Data A.

Fluid Conditions 1.-

Temperature 212 deg F Assumption D 2.

Density 59.81466 lbm/cuft Ref. A l

- av-l 3.

Viscosity

.2822 c.p.

Ref. A PO 4.

Vapor Press.

14.696 psia Ref. A to 5.

Flow Rate 3950 gpm Assumption C q

B.

Elevations e,

141.90 a rt 1.

Suppression Pool 100.?107=

feet Assumption B zki ch 2.

Press. above SP 14.696 psia Ref. B F

3.

Pump Suction 175.75 feet Ref. E

- Os C.

Suction Piping O

c) 1.

Inside Diam.

15.25 inches Ref. F 2.

Basis Diam.

15.00 inches Ref. A 3.

Straight Length 66 feet Assumption G 4.

No. of Gate Valves 1

(F001)

Ref. E CV =

17,375 Ref. G 5.

No. of 90-deg elbows 6 Ref. E 6.

No. of 45 deg elbows 1 Ref. E 7.

No. of Tee Branches 1 Assumption E 8.

No. of Tee Runs 3

Ref.'E k

CALCe NO.

M-52-31 REV. NO.

1 OJ1IGINATOR Skin Denny DATE 12/02/88 CHECKED #W1 Athe DATE 1L -t-9E PROJECT Limerick Generatina Station Units 1 and 2 JOB NO.

8031

• • JECT Core Sorav NPSRA Calculations - Two Pumn Runout SHEET NO.

6 3

l 4

VII. Calculations 1.)Ji%HA (lens cN@AytfNM ALLW A%E MM WJR ME%VMY@

A.

Friction Losses p

I.'

strainers

)

ECA I

K=

2.0

• 25'

=

7286 j

N 6

{

1. % -5*.95 %.4*3950 N v

2.

Straight Length

=

2.78E+6 03 Re = 50.65929

• 3950

• 59.81466 15.25 *.2822 e=.00015 feet (Comm. Steel)====>

fa.0134 73 y,

K = (1+40%)

• 12 *.0134

• 66 / 15.25 =.975889 m

3.

Gato Valve (F001) 8

.159556 P

K = 890. 603 84

• 15. 25' / 17,375

=

4.

90 deg Elbows c)o X = 6

• 14 *.013 * (15. 2 5/15. 0 0)' = 1.16 6 6 4 0 5.

45 dog Elbows K = 1

• 5.82 *.013 * (15. 25/15. 00)' =. 0808 58 6.

Tee Branchos K = 1

• 60 *.013 * (15. 2 5/15. 00)' =. 8 3 3 315 7.

Tee Runs F a 3

• 20 *.013 * (15. 2 5/15. 00)' =. 8 3 3 315

CALCUIATION SHEET It/31/99

%.g y

N. M. Vs W /p c a t. /1/ff//8 d CALC. 31 REV. 110.

Kb ORIGINATOR Skin Danny DATE 12/02/88 CHECKED M'5 ^/**vw DATE I L - t 9+

PROJECT Limerick Generatina Station Units i and 2 JOB No.

8031 3 JECT _._ Core Sorav NPSHA Calculations - Two Puno Runout S!!EET NO.

7 8.

Total K K=

-697494*e9-9 97 588 9 +.159556 N 06 7'h5

+ 1.166640 +.080858 +.833315 +.833315 = M ) %

B.

NPS!!A NPSHA = 144 * (- 14. 696 - 14.696 ) / 59. 814 66 I49 44 y

+ ( -190. 01G7 - 17 5. 75 )

d

/15.259f71) j" L. 0 5" Tff5 (2. 59115E-3 8

co EA

• -10.dE 05;

• 3950

'A..F /

12.. o k6r3d7791-f eet N

=

em VIII.

Comparison NPS!!A.va. NPSHR ln A

"l6,. 5 if i 2

• O 90 Since NPSHK =

d5.2277^5 feet i M M

and

$ ~ NPSHK =

/ 0, O R.

(f.2f I-)\\

- 1+es feet h

e --

2.o 7m' we have a margin of "r'I O & feet ctA.

Ci

"'herefore, NPSHA > HPSHR and the suction line is o

ADEQUAT.E f.CP G., NC7F( FremP5 Titr N/54 /.ET v.4co IS.D l't.P F Fct. Mc00 6' ptt5 N

-T h e i b W iv'F i %

-s m;::=:C 4; ' c r ",, : : A 27.ac;;;; M W "

LW

' 44 6.a: Fo A T ;:

Tw.,e u;;h^.;;

TH' e 40,o

• NPJHtt R&ffilENCFO I4 R E F, 5. I t" THG A CTU A L V A L4 C-Ab sufhtG O Pd THE Patif VENOM

• y

($e imwwn C ma b.. " n ' 4 Us

- Et Afsp

^

mus s g

.)

CALCULATION S!!EET A

//43C M4 W 4 / 3- /

• f/ 9/'

A.M. % rA NGe#L. /1/1'//8/ Q CALC. 11 0..M-52-31 REV. 110.

9'. 2-ORIGIllATOR Skin Denny DATE 12/02/88 CilECitED /LAiM N w a DATE 11 1-N-PROJECT Linorick Generatinct station Units 1 and 2 JOD 110.

8031 ECT _ Core Soray NPSilA Calculations - Two Puno Punout SilEET llo.-_

8 IX.

Figuros DRYWELL g

SUPPRESSIoli POOL 14.696 paia

/97,7G P

=

v Mininum Water Level in M 9r9-14 feet T = 212 P to i

N c?

t!I

(>

5 y

16" !!BB-120/220

'O O

Core Spray Pump Pump Suction Elevation 175.75 feet FIGURE 1

M atara 154 C At.C N o.: M 52 31

' PECO ENgY CALCULATION SHEET PAGat 9

Revision 4

19 61.

REVISION 4 ccA P it g To re e luate the not positive suction head available (NPSHA) for the core s ay (CS) system with suction a ned from the suppression pool (SP) under the worst expected c0 ditions and with an increase in e maximum allowable differential pressure across the surtion tralner of 3.6 psid (the original desig w&4 2.0 psid).

During the regula ump valve and flow tests, measurements will be t en of the pressure at the pump suction (PP 52136 D and PP o2 236A D) with suction aligned to t e SP and with no flow (static) and i

with design rated (3, 5 gpm' pump) flow (dynamic), The purpose f these m88turements is to show loop capability for LG echnical Specification requirements. A dditional purpose of this calculation is to establish the maxin m value for the difference between t se two measured pressures beyond which the loop may not se sfy its safety function.

Results These results to applicable to both LGS nit 1 and Unit 2.

With suction aligned from the S under worst expecte conditions (212'F and 1 atm), with a pump flow rate of 3.950 ppm! pump (represen g full pump runo ), a SP level of 199' 11W, and a maximum allowable dNferential pressure actos the suction str nor of 3.6 psid, the calcutated nel positive suction head available tnd margin to the n31 sitive suct' n head required are, NPS A = 12.0 feet argin = 2.0 feet With a system test (SP to SP) flow rate 3,1 ppnVpump, the maximum allowed change in suction pressure measured at PP 521(2)36A(- ) is 3.3 sid. If the test flow rate is 3.950 ppm' pump, the maximum allowable v6ue rises to 5.

psid.

P,

. P

> 3.33 psid 3,175 gpm' pump) m

> S.10 psid ( 3.950 ppm' pump)

Max, Allowed J.02ufg T

212

'F

=

P 45 psia (only used to determ p and p)

=

59.81992 lbm/ cutt p

=

0.28222 p

p

=

P.

=

1 at P

1 atn

=

0 3.950 ppm

=

d 15.25 inches

=

K(wic avainer) 4.049573

=

A P,,,,,,,

3.6 psid

=

Zo 199.95833 feet

=

Z 175.75000 feet

=

m NPSHR 10.0 f eet @ 3,950 ppm

=

kI

.ns.ri c tS4

]

CALC NO.: M 52 31 P

ENgY CALCULATION SHEET eAoE:

1o Revision.

4 Calculations NET PO ITIVE SUCTION HEAD AVAILABLE

[

Flow losses et including strainer) from page 3 2 Equation 3 5 of References r & 6, AP, = 1.800864381E-5 p K Qe d4

1.258 psId Calculating the NPSHA, with P.

NPSHA = 144(P. P, - A P - AP,%,) + Z,p - Z P

pomp IM

= 199.95833 - 17.75 - 59.81992 (1.258 + 3.6)

= 12.5 feet @ p = 59.1992 lbm/cuft 59.81992 12.514 x 62.4

= 12.00 foot @ p = 62.4 lbm/ cutt

Thus, 12.0 feet NPSHA

=

NPSHR.

10.0 feet (@ 3.950 ppm. Ref 1

=

2,00 feet

\\,

Margin

>k e

1

.494 314%s 004 e

CALC in: M 52 31 PECO ENERGY CALCULATION SHEET exoE:

11 nuctan onou,,

Revision -

4 w

Tf M Cahlations (Cont'ct)

C4

^

MAXIM 4VALUE The pressur oss due to flow calculated above considered the longest suo n line from the SP, assumed a co ervatively long penetration length, included fitting lengths i the straight pipe, and added 40% to th straight pipe losses to account for a 40 year life. The quivalent length calculat edis therefore conserva e for the calculation of NPSHA, but should not be sed to evaluate a maximum value for a measure liference in suction pressure between static a dynamic conditions becauue it would attribute more m sured flow dP to the line itself and less to e stralner. Thus a conservahvely LOW value for K should used for this part of the calculation, e resistance factor (K) for fittings will not change, but we will not ciude the 40% additional (for 40 y r life) to the straight pipe length t nd we will only use half the strai pipe length (33 feet). This wi give us a K f actor for the straight p ipe of, 1

Kg= /

33 12

.0134 x 15.25 l

= 0.34796 We must also calcWte a rests nee coctfielent for the strainer, sine we w..J be testing the system ai a flow rate less than fusi runou 3,175 gpm/ pump versus 3,950 ppm'pu

). Using Equation 314 on page 3 4 of Reference A a strainer design conditions, A P,un, d 4 1.800864361E-5 p Oe (3.6) (15.25)4 1,800864361E-5 (59.81992) (3950)8

= 11.5890676

---.y--,---.,,_,.m.

. -.. ~ -. - - - - - ~ - -

.8M fles3144 cat.C No.: M 52 31 PEC ENEgY CALCULATION SHEET exas:

12 Revision 4

Tink dalculations (Cont'd)

M Thet Iline resistance coefficient will then be, Kw = 11.58907 + 0.34796 + 0,159556 + 1.166

+ 0.080858 + 0.833315 + 0.833315

= 15.010714 it is conservative to assume th hottest SP temperature expect during the test, that of the maximum SP temperature allowable by Te nical Specification during n mal plant operation,95'F.

T 95

'F

=

P 43 psia

=

62.0668 lbm'cuft p

=

0.719 ep p

=

O 3,17 gpm

=

Evaluating the line losses (including the suctl stra er),

AP = 1.8008643 1E-5 (15.0 714)(62.06687)(3175)8 f

(15.25)4

= 3.127 psld The difference between th ressure at the pump suction (PP) at static enditions and at dynamic conditions can be expres d as, A P = P,u, - Peg,

= A P, + A P,

where, f.

pressure at the pump suction with no flow

=

pressure at the pump suction with flow

=

AP pressure loss due to flow (not including the suction str ner)

=

f AP.

pressure loss due to velocity (i.e. the velocity head in p )

=

,,,.ss,..

""?e""@f CALCULATION SHEET

$$"T""

o Revit,lon 4

C tations (Cont'd)

The pre ute loss due to velocity la evaluated as, AP, = 1.80086E-5 P-08 d'

(62.06687) (3175)8

= 1.80086E-5 (1.25)*

= 0. 0833 psld Thus the difference between the measured su.rt pressure at static and dynamic conditions beconles, AP=AP +A j

y

= 3.1 716 + 0.20833 3.33549 psid (@ 3,175 gp pump)

Note: If the test is run full runout (3,950 ppm' pump) the ACTION value c anges to, 3950 "

AP = 3.33549,3175 s

= 5.1626 psid (@ 3,950 gpm/ pump)

--e m

,t CALCULATION M 52-31, PAGE 14 a'

2. NPSIIA Mareln Raamd On Actual Dirty Strainer Al' From Reference B, the CS System in Mode G is the accident mode at pump nmout conditions and is the limiting case.

NPSHA = 12.0 ft H O @ 3,950 rpm @ 212

• F (page 7 of this calculation)

I 2

The above NPSHA is based on the maximum allowable AP for the new large capacity passive strainers. The purpose of this calculation is to determine the NPSHA margin based on the actual diny strainer AP. Therefore, the above NPSHA will be adjusted to obtain the NPSHA based on the actual dirty strainer AP:

NPSilA,w.ioi, = NPSilAp.,,, + Maximum Allowable Dirty Stralnct AP Actual Dirty Strainer AP 4

Maximum Allowable Diny Strainer AP @ 3,950 gpm @ 212

• F = 9.2 ft (References C and J)

The Actual Didy Stralner AP is obtained from Table 4 of Reference J:

Actual Dirty Strainer AP O 3,950 gpm @ 213

• P = Stralner System lesscJ + StrainerBed leases Actual Dirty Strainer AP @ 3,950 gpm @ 213'F = 1.54 ft + 2.63 ft = 4.17 ft NOTE: The Actual Dirty Strainer AP obtained from Reference J is based on 213 *F, however the actual Mode G temperature is 212 'F.

This 1 ' F difference is considered to have an insignificant affect on the strainer AP based on the insignificant change in water preperties from 212

• F to 213 ' F.

Therefore, NPSHA,.i ni, = 12.0 ft + 9.2 ft - 4.17 ft = 17.03 ft H O A

2 Determine NPSHA Margin:

NPSHA Margin = NPSHA,.ioi,- NPSHR 4

NPSHR = 10 ft @ 3,950 gpm (Reference I)

Therefore, NPSHA Margin = 17.03 ft - 10 ft = 7.03 ft H O 2

Therefore, there is sufficient margin between the Core Spray Pump NPSHA and the NPSHR when considering the actual dirty AP of the new large capacity passive strainers.