ML20238F835
| ML20238F835 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/28/1998 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20238F827 | List: |
| References | |
| M-51-62, M-51-62-R05, M-51-62-R5, NUDOCS 9809040366 | |
| Download: ML20238F835 (43) | |
Text
-___ - _ _ - _ _ _ _ _ _ - - _ _ _ _
i Effective Date:
EXHIBIT NE-C-420-6 Rev 3
) PORC NO Page 1 of 1 SQR NO AWJ/mak QR. NO ,
50.59 NO '
RESP MGR. YES '
Calc. # Af -$/--f 2 Rey,
[
ECR # k'8/[b Rev. O CALCULATION REVISION SHEEET
'l INTERIM REVISION MARGIN REVISION PRELIM REVISION t
THIS CALCULATION HAS BEEN IMPACTED PER THIS REVISICN SHEET AS FOLLOWS:
.TN('09Pd26' PR (fr 9f-0/M9. kis PSVM/9?M #l#DE /N EBV S PER to? @-.Moa en wrr 1 AWE Nou) AlAo AP9LICABIE 77) UNIT 2. ..
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NS 12CVIS/0ftl or M-S7 -42 cap cuy 77ter evs2swn9~ -rv Aacesss nmq 7n oxf 2 Prepared By: 4 hMk Date: /b [
Reviewed By: Date: R[~2=/77
.) Approved By: ($ "
Date: 2-2%-9E
..- t 9809040366 980828 PDR ADOCK 05000353' P PDR i _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ - - - _
l Effective Date:
EXHIBIT NE-C-420-3 Rev 3 PORC. NO Page 1 of 2
-) -
SQR QR; NO NO AWJ/mak l 50.59 NO RESP MGR. YES ,, Calc # [f-5/-h2- Rev. [
ECR # @ -b/MC/ Rev. d l
CALCULATION REVIEW CHECKLIST (This revision is a complete rewrite) t.
i' MANUAL COMPUTER YES or l C'.LC. CALC.
pjg
[ Preoarer '
X X Freeform Comments field of PIMs and DEC database issues were reviewed for I65 inclusion of issues within the revision scope Reviewer:
X X Calculation is the appropriate basis for the activity 1
X X Format requirements are followed _y_
New Calculations follow Exhibit 12 format Revisions -
- a. Applicable content addressed within existing format or
- b. Addressed in new section, Technical Content impact of ECR XX- XXXXX /
X X Calculation assumptions, considerations, and methodology conform to applicable __Y_
design requirements X X AR evals have been issued to track assumptions requiring confirmation Afr.
X .X Sources of data and formulas were reviewed and verified to be correct and complete Ada_
X X- Input data is correct and used property X. The analytical method used in the calculation has been considered and is proper for the 4
_tk intended use X Mathematical accuracy has been checked and is correct (indicate method used) /h.
-a) Complete check of each calculation b) Spot check of selected calculations c) Performance of altemate or approximation calculation (attached)
X X Calculation results were checked against applicable design criteria and were found to be in compliance 4 X X. Existing calculations requiring revision as a result of this calculation have been identifiedanddocumented
.Q X The analytical methods described in the computer calculation summary are proper for theintended use 88 X Calculation accuracy has been checked and is correct (indicate method used) 4 a) Check sample calculation using data other than that used in the sample b) Performance of altemate or approximation calculation (attached)
- c) Describe other method used t
Exhibit NE-C-420-3, Rev. 3 Page 2 of 2
~
X' ' Program used is appropriate, input is valid, and output is reasonable considering the A/4.,
) input X- X Base calculation has been reviewed against current drawing revisions and posted _g_
DCOs to ld,entify significant dfferences /
X X A 50.59 has either been prepared or an existing 50.59 covers the scope of the calculation revision X' X All system and topic numbers associated with the calculation are listed X X The PIMs Document Control Module Responsible Branch code for the calculation is correct Interim Revision:
X X
X X
Latest revision of Calculation Cover Sheet prepared except for signatures RESP ORG field on page 4 of ECR has been changed to ECR preparer branch code d
unless altemate agreement reached with another branch for astuildng 4 '
X X Copy of revision attached to ECR X X DEC database revised to reflect resolution of issues Direct Revision:
X.
X.
X X
Latest revision of Calculation Cover Sheet used M
DEC database revised to reflect resolution of issues _d Marain Revision:
DEC database revised to reflect resolution of issues .
.4/8 X X Copy of revision attached to ECR .gg >
Acorover Marain Revision X X PIMs CHANGE AUTHORIZING DOCUMENT Screen Current date entered in DWG INC DATE field and M
'9999" entered in INC REV field 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. If a calculation is both a manual and a computer cale, then the attributes to both manual and computer calculations need to be considered.
List the documents used to support this review.
)
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l Prepared By: , Date: F,' , &
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"The reviewer's signature indicates compliance with S&L standard SOP-0402 and the ver!fication of l
thefollowing minimum items: correctness ofmathfor handprepared calculations, appropriateness ofinput data, appropriateness ofassumptions, and appropriateness ofthe calculation method. "
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CALCULATION REVIEW CHECKLIST MANUAL- COMPUTER YES or N/A CALC. CALC.
X X Calculation is the appropriate basis for the activity '/55 X X Calculation assumptions, considerations, and methodology conform to applicable design requirements Vrg X X Sources of data and formulas were reviewed and verified to be correct and complete vfr X X input data is correct and used properly ygcc X The analytical method used in the calculation has been considered and is proper for the intended use P6'S X Mathematical accuracy has been checked and is correct (indicate method used) )'6 5 a) complete check of each computation y6 3 b) spot check of selected computations 4//4 c) performance of alternate or approximation calculation (attached) A//A X X Calculation results were checked against applicable design criteria and were found to be in compliance WI X X Existing calculation requiring revisbn as a result of this calculation have been identified & dwmented A//4, X The analytical methods described in the computer calculation summary are proper for the intended use 4//A X X All system and topic numbers associated with the calculation are listed yb!r X Computational accuracy has been checked and is correct (indicate method used) A//4 a) check sample calculation using data other than that used in the sample 4//A b) performance of alternate or approximation calculation (attached) d/4 c) describe other method used A//4 X Program used is appropriate, input is valid, and output is reasonable considering the input /t//2;t X- X Base calculation has been re' viewed against current drawing revisions and posted DCD's to identify significant differences )7ti 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 calculation are noted by an "X" in the appropriate column.
List the documents used to support this review. A g:44whrMS/Oc('vpWrr M MF68 8y n)#D P-OOMS-/ A #7h" sNr A6WWG TO V6##v 1//977 M6VnMWJ A 19 K CudM6 W PREPARED BY: -
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_ CALC. NO. N"* C / ~ b b NO, OF SHEETS
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g Q s'o:=:y'C RECORD OF LSSUES
- NO. DESCRIPTION BY DATE CHKO DATE APPRO DATE A
m A in A N /9\ & asw coura_ suest N A Final calc. Revised for calc. d screening only. Added sheet d , y.m.cy
^ list of MDCPs DCPs etc. y% #\ Wi#"
lAh $f1b0 rev1ewed./tgas k % % F ID CALCULATION SCREEN [NG FOR THE AS-BUILT des!GN fd The purpose of this calculation revision is to document that the calculation results
- and conclusions are still applicable to the as-built design of the plant, including modifications.
j % Reviewer has determined the calculation results and conclusions are applicable to the as-built design of the plant because:
O O the original design margin was large and subsequent modifications have had little or no impact on the design margin.
here have been no modifications to the system which affect this calculation.
the pre-op test 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:
a C Reviewer has detern:ined the calculation results and conclusions are no longer applicable to the as-built design of the plant because:
the calculation design margin has already been exceeded.
Other:
C Reviewer cannot determine that the calculation results and conclusions are applicable to the as-built design of the plant in the time available. Further technical evaluation is reconsnended.
2r.
)tefer to Sheet # for a list of ECPs, DCPs, design documents and pre-op test results that were reviewed during the calculation screening review.
T h:* '..? Utilization of this calculation by persons without access to the pertinent factors and without proper regard for Sta purpose. could lead to erroneous conclusions.
should it becces necessary to use any of this' calculation in your work in the future. it is suggested that the calculation be reviewed with authorized aechtel personnel, to ensure that the purposes. assumptions, judgments and 11attations are thoroughly understood. Rechtel cannot assues responsibility f or the use of cal-lculations not under our direct control.
seP 30:20. Rev 8/88 soa nav s mu T-42/27
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Ef fect ive Dete 9/4/94 Exhibit NE-C-420-1, Rev. !
Page 1 of 1 RAS /kam CALC. # b
- b! ~ b 1 REV. N b M PM MC CALCULATION-REVIEW CHECKLIST MANUAL COMPUTER YES or N/A CALC. ^ CALC.
X X CALCULATION IS THE APPROPRI ATE BASIS FOR THE ACTIVITY X X CALCULATION ASSUMPTIONS, CONSIDERATIONS, AND METHODOLOGY CONFORM TO I APPLICABLE DESIGN REQUIREMENT 3 X -X SOURCES OF DATA AND FORMULAS WERE REVIEWED AND VERIFIED TO BE U CORRECT AND COMPLETE X X INPUT DATE IS CORRECT AND USED PROPERLY X THE ANALYTICAL METHOD USED IN THE ' CALCULATION HA3 BEEN CONSIDERED 7 AND IS PROPER FOR THE INTENDED USE X
MATHEMATICAL ACCURACY HAS BEEN CHECKED AND 13 CORRECT (INDICATE 8 HETHOD USED)
A) COMPLETE CHECK OF EACH COMPUTATION I' B) SPOT CHECK OF SELECTED COMPUTATIONS - AM C) PERFORMANCE OF ALTERNATE OR APPROXIMATION CALCULATION A.8 4 (ATTECHED)
X X- CALCULATION RESULT 3 WERE CHECKED ACAINST APPLICABLE DESION CRITERI A AND WERE FOUND TO BE IN CCMPLI ANCE X -X EXISTING CALCULATIONS REOUIRING REVISION AS A RESULT OF THIS CALCULATION HAVE BEEN IDENTIFIED & DOCUMENTED X THE ANALYTICAL METHODS DESCRIBED IN THE COMPUTER CALCULATION 4/A
SUMMARY
IS PROPER FOR THE INTENDED USE X X ALL SYSTEM AND TOPIC NUM5ER3 ASSOCIATED WITH THE CALCULATION ARE Y LISTED X COMPUTATIONAL ACCURACY HAS BEEN CHECKED AND IS CORRECT (INDICATE A/d METHOD USED) ,
A)- CHECK SAMPLE CALCULATION USING DATA OTHER THAN THAT USED IN MN THE SAMPLE B) E?RTORMANCE CF M. TERNATE OR APPROXIMATION CALCULATION M (ATTACHED)
C) DESCRIBE OTHER MLTHOD USED: ..
X PROGRAM USED IS APPROPRI ATE, INPUT IS VALID, AND OUTPUT IS A) b REASONABLE CONSIDERING THE INPUT X X BASE CALCULATION HAS BEEN REVIEWED ACAINST CURRENT DRAWING REVISIONS AND POSTED DCDS TO IDENTIFY SIGNIFICANT DIFFERDICES 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 'ccalculations are noted by an 'X' in the appropriate column.
List the documents used to support this review. CH I4 d # a. H - 410 G ver_
? ~r C.n MI E)l- toet- 3 ~ l 2- s = 19 So le~ h eJ 9tu an m s . E n - oc s.o . 4-* * *
. REVIEWED BY: 'd i DATE: (0.O M l
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CALC. NO. N- 9" N REV. NO, 3 OniclNATOR bO b- Of-otoIl DATE l- D i
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[ PROJECT _ lbb I)K # % / fA JOB NO. -
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The Foilowing MDCPs, DCPs. Design Documents, and Pre-Op Test Results Were Reviewed.
If) Circled items relate specifically to this calculation.
M MDCP DCP PCR/PCN g UNIT 1 UNIT 2 UNIT 1 UNIT 2 UNIT 1 UNIT 2 0024-1 0815-1 5579-2 68 2006 5 1115 6878 O! 0035-1 0831-1 6006-2 76 2014 80 5006 6995 0047-1 5010-1 78 2015 84 5012 8203 0133-1 5042-1 81 2021 86 5013 8455 gfy 0171-1 5054-1 109 2044 116 5022 8466 0176-1 5178-1 115 2083 121 5042 8468 CN 0193-1 5228-1 117 2088 248 5510 8477
_ 0302-1 5261-1 139 2092 620 5562 8595 0303-1 5579-1 156 2095 6005 20173
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0363-1 5650-1 239 2103 6080 20176 0397-1 5658-1 289 6084 20179 0
0494-1 5663-1 367 6116 20181 0522-1 5716-1 493 6121 20216 0680-1 5770-1 558 6171 20319 0696-1 5789-1 559 6208 20321 0793-1 5791-1 563 6240 20329 0801-1 5906-1 2014 6241 20383 2015 6306 20405 2021 6331 20423 2083 6354 20477 2088 6373 20562 2092 6494 20580 2095 6569 20739 2103 6620 20886 Other:'DesigniDocuments+
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REFERENCES (CONTINUED)
- 11. Specification No. NE-265, Revision 1, Specification for ECCS Suction Strainers.
- 12. Bechtel Drawing 8031-M-277, Revision 66. .
- 13. SDOC NE-265-00037, Revision 0: ABB Calculation 599-PENG-CALC-060, Revision 0, Limerick ECCS Strainer Sizing for Debris Loading and Pressure Drops.
14.- SDOC NE-265-18, Revision 0: ABB Calculation MISC-PENG-CALC-062, Revision 0, Evaluation of Predictions and Data for Prototype Strainer.
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s $F P 20768 Rev, (6/76)
196 21453 1s4
^
"Suo d"Jc"P CALCULATION SHEET EA$"is***
Revision # .s' REVISION 4 Purpose
. To re-evaluate the net positive suction head available (NPSHA) for the residual heat removal HR) system with suction aligned from the suppression pool (SP) under the worst expected cond' ons and with an increase in the maximum allowable differential pressure across the suction strain of 5.0 psid (the original design was 2.0 psid).
During the regular pump valve and flow tests, measurements will be taken of the pr ssure at the pump suction (PP-51 102A-D and PP-51-202A-D) with suction aligned to the SP and w' no flow (static) and c with design rated (10,000 gpm) flow (dynamic). The purpose of these measure ents is to show loop capability for LGS Technical Specification requirements. An additional purpo of this calculation is to establish the maximum value for the difference between these two measur pressures beyond which the loop may not satisfy its safety function.
Results With suction aligned from the SP under worst expected conditio (212*F and 1 atm), with a pump flow rate of 11,000 gpm, a SP level of 199* 11%", and a maximum owable differential pressure across the suction strainer of 5.0 psid, the calculated net positive suctio ead available is NPSHA = 7.97 eet h The margin to the net positive suction head required y the pump is, Marg' = 2.0 feet With a system test (SP to SP) flow rate of 1, 00 gpm, the maximum allowed change in suction t pressure measured at PP-51-1(2)02A(-D) i 6.3 psid.
P,.-P%, > 6.3 psid Max. Allowed These results are applicable to bo LGS Unit 1 and Unit 2. ,
Inputs T = 212 *F P = 45 psia (only used to determ p and p) p = 59.81992 lbm/cuft P = 0.28222 cp P = 1 atm
= 1 atm O = 11,000 gpm d = 23.25 inches L%(24") = 474.5 feet Lo(30") = 151.5 feet Zps = 199.95833 feet Z,oo
= 174.87500 feet i NPSHR = 6.0 feet @ 11,000 gpm c____-_______ _ _ _ _ _
196-21453 1/94 I
"" ^
'NERP uo an CALCULATION SHEET SAEe ie"~~**
" I Revision #f i
Calculations NET POSITIVE SUCTION HEAD AVAILABLE Flow losses (not including strainer) from page 3-2 of References 5 & 6, f
1 Re = 50.65929 OP d q l
N!
l
= 5.08 E+06 l
)
To account for 40 year life, assume a roughness f actor of 0.00085 feet (equivalent to cast iron).
From page A-24 of References 5 & 6, f = 0.0163351.
From page 3-2 Equation 3-5 of Reference 5 & 6, AP, = 2.161037 3E-4 IP0 Ly
= 474.5 + 151.5 x 23.25 "
< 29.25 j
= 522.57 feet AP, = 2.161037233E-4 (0.0163351)(59.81992)(522.57)(11M)
(23.25)5 l 1
l
= 1.965 psid '
l l
1M-214531/94 PECO EN Y CALC NO.: M-51-62 CALCULATION SHEET e^oe: 17 Revision #5 Calculations (Cont'd)
Calculating the NPSHA, with P, = P,,
NPSHA = 1"(P - Py - AP f- AP,%) + ZSP - Z p p
= 199.95833 - 174.875 - IM 59.8199 1.965 + 5.0)
= 8.317 feet @ p = 59.81 2 lbm/cuft b
= 8.317 x 59.819 %
6 .'4
= 7.97 est @ p = 62.4 lbm/cuft Thus, NPSHA = 7.97 feet NPSHR - 6.00 feet (@ 11.000 gpm. Ref 10)
Margin - 2.00 feet I
_ _ _____________ _ l
106 21453 1/94
. 1 PECO ENERGY CALC NO.: M-51 E2 CRCUMTION SHEET e^oE: 18
- f_~
Revision ,_
Calculations (Cont'd)
MAXIMUM VALUE The pressure loss due to flow calculated above considered the longest suction line from th P and assumed a roughness factor of 0.00085 to account for a 40 year life. The equivalent len calculated is therefore conservative for the calculation of NPSHA, but should not be used to evalu e a maximum value for a measured difference in suction pressure between static and dynamic con ~ ions because it would attribute more measured flow dP to the line itself and less to the strainer. T s a conservatively LOW value of equivalent length should be used for this part of the calculation.
It is conservative to assume the hotest SP temperature expected during the t t, that of the maximum SP temperature allowable by Technical Specification during normal plant op ration,95*F.
T = 95 'F P = 45 psia p = 62.06687 lbm' uft p = 0.71955 c Q = 10,000 gpm Calculating the Reynold's Number for these input paramet rs yields, Re = 50.6 29 OP pd
= 1.88 E+06 and using clean pipe with a rough ss factor of 0.00015, we get a friction factor of, f = 0.0124405 Re-evaluating the a total e uivalent line length using shorter line lengths of, L,(24" = 450 feet L,(3 ') = 100 feet
'23'25'5 L" = 450 + 100 x 29.25, 1
= 481.73 feet
196 21453 1/94 "E ENER "
uc c CALCULATION SHEET $$efi9 Revision JP 6 x
Calculations (Cont'd)
Evaluating the line losses (not including the suction strainer),
APf = 2.161037233E-4 (0.012M5)(62.06687)(41.73)(10000)2 (23.25)5
= 1.183 psid The difference between the pressure at the pump suction (PP) at static conditi s and at dynamic conditions can be expressed as, AP = P,wc - P g.
b
= A P, + A P, + A P %
where.
P,,,,, = pressure at the p mp suction with no flow P% = pressure at the mp suction with flow APf = pressure loss ue to flow (not including the suction strainer)
AP, = pressure los due to velocity (i.e. the velocity head in psid)
A P,,,, = maximum llowable pressure drop across the strainer (5.0 psid)
The pressure loss due to velocity is evaluated sing the 30" suction pipe (since the pressure tap is in the 30" portion of the suction line) as, A P , = 1. E-5 P d4 l = 1.80086E-5 (62.06687) (10000)
(29.25)4
= 0.1527 psid i
i Y_____-______-_______
1M2unta I
PECO EN Y CALC NO.: M-51 -62 CALCULATION SHEET e^as: 20 Revision #I Calculations (Cont'd)
Thus the difference between the measured suction pressure at static conditions and at conditions becomes, AP = AP f + AP y + APu
. A
= 1.1 0.15 + 5.00
= 6.3 psid Max. Allowed l
l E - - _ - - - - - - - - _ - - - - - - - - - - - - -
ECR # LG 97-03058 CEMMM-M-@ Pm M
- 2. of AEM ,
- 1. CALCULATE NPSHA FOR MODE "A-1" (REF.1)
Operatine Conditions Flow = 10,150 gpm .
Temperature = 170*F Specific Weight @ 170*F = 60.79 Ib/ft' (Ref 7)
Minimum Suppression Pool W.L. Depth = 18.04 ft (Ref 2)
Minimum Suppression Pool W.L. Elevation = 199'-11%" (Ref 2)
Pressure @ Suppression Pool = 14.7 psia (Ref 1)
Vapor Pressure @ 170*F = 5.99 psia (Ref 7)
Pump Suction Elevation = 174.875 ft (Ref 3)
NPSHA = h, - hyp, + h, - h3 v.
4 where, ,
i
- h. = absolute pressure (in feet ofliquid) on the surface ofliquid supply level hyp, .= head (in feet) corresponding to the vapor pressure of the liquid being pumped i
h, = static head (in feet) ofliquid above centerline ofimpeller eye j h3 = suction line friction losses (in feet)
Calculate Suction Line Losses (AP)
AP = 0.000216 3 (Ref 5) d I
where, _ l I
i AP = friction losses, psi '
. Q = flow, gpm ,
L = length of pipe,' ft d = internal diameter of pipe, inches l
p = weight density of fluid, Ib/ft' i
' f = friction factor l
. 1
- I CALCULATION M-51-62, PAGE 22 J2e45 Reynolds Number of Flow in Pipe i
O# #8 Re = 50.6 (Ref 5) M N
3 OF_
where, '
= absolute (dynamic) viscosity in centipoise = 0.4 @ 170* F (Ref 5)
AP @ 24" Line Re = ( ' }( ' )
= 335x10' (23.25)(0.4) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for Pipe Aging 24" DIA, CastIron Pipe = 0.0004 (Ref 5) f = 0.016 (Ref 5)
AP3 . = 0.000216 (0.016)(474.5)(60.79)(10150)2 (23.25)'
= 1.51 psi 6P @ 30" Line Re=( ' ' }
= 2.66x10' (29.25)(0.4) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for Pipe Aging 30" DIA, Cast Iron, Pipe = 0.00034 (Ref 5) f = 0.015 (Ref 5)
AP, = 0.000216 ( . )( )(60.B)(10M0)2 (2925)5
= 0.144 psi l
L----_----------
I 1 .
CALCULATION M-51-62, PAGE 23 D5V S l AP of Suction Stminer ECR # LG 97-03058 Dirty AP @ 11,000 gpm @ 180*F = 7.11 ft (Ref 13) 6 4' OF For Mode A-1 the strainer AP @ 10,150 gpm @ 170
- F is needed.
t The 10 *F difference in temperature between Mode A-1 conditions and Reference 13 is addressed in the note on page 24.
The dirty strainer AP given in Reference 13 consists of normal system losses and bed losses (the layer of debris consisting of fiber and corr 6sion products). When adjusting the AP for various flow rates the system losses are proportional to the square of the flow rates , while the
. bed losses have a linear relationship to the flow rates (Reference 14).
From Reference 13 the actual system losses are 2.85 ft and the bed losses are 4.26 ft @
11,000 gpm @ 180*F.
Therefore, the dirty AP @ 10,150 gpm @ 180
- F is:
fl0'150 fl0'150' (2.85 ft)(11,000>+ (4.26 ft)(11,000s= 636 ft H O 2 Total Suction Line Friction losses h3 = AP24. + AP 3o. + APSULANER h3 = (1.51 + 0.144)(144/60.79) + 6.36 = 10.28 ft H 2O Static Head h, = Min W.L. @ Suppression Pool - Elevation @ Center Line of Pump Suction Nozzle h, = 199.96 ft - 174.875 ft = 25.085 ft
_m______.__.____ _ _ _ . _ _. . _ _ _
CAI.CULATION M-51-62, PAGE 24 pg.s MODE A-1 NPSHA ECR # LG g7 03058 NPSHA = h, - hy , + h, - h ,f - '#I OF_
NPSHA = (14.7 - 5.99)(144/60.79) + 25.085 - 10.28 = 35.44 ft H2O RHR Pump NPSHR @ 10,150 gpm = 5 ft H O 2 _ (Ref 10)
NPSHA > NPSHR NOTE - the dirty strainer AP used is for 180
- F. Based on Reference 14 the stminer AP will-be slightly greater at 170 *F (from 180
- F to 170
- F will not result in the NPSHA being less than the NPSHR for Mode A-1.
I O
i 6
CALCULATION M-51-62, PAGE 25 AdC
- 2.- CALCULATE NPSHA FOR MODE "A-2" REF.1)
Ooerating Conditions ECR # LG 97-03058 Flow = 11,000 gpm dS OF Tempenture = 180*F >
Specific Weight @ 180*F = 60.57 lb/ft' (Ref 7)
Specific Weight @ 212'F = 59.81 lb/ft' (Ref 7)
Minimum Suppression Pool W.L. Depth = 18.04 ft (Ref 2)
Minimum Suppression Pool W.L. Elevation = 199'-11%" (Ref 2)
Pressure @ Suppression Pool = 14.7 psia (Ref 1)
Vapor Pressure @ 180'F = 7.511 psia (Ref 7)
, Pump Suction Elevation = 174.875 ft (Ref 3)
NOTE: Equations for NPSHA, AP, and ReynoI'ds Number are defined in the section of this calculation evaluating Mode A-1 (see page 21 and page 22).
AP O 24" Line p = absolute (dynamic) viscosity in centipoise = 0.35 @ 180*F (Ref 5)
Re = (50.6)(11,000)(60.57) = 4.14x10' (23.25)(035) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for pipe aging.
l 24" DIA, CastIron Pipe = 0.0004 (Ref 5) f ='O.016' (Ref 5)
AP24 . = 0.000216(0.016)(474.5)(60.57)(11000)2 (23.25)'
l
- = 1.77 psi c
j, - 6P @ 30" Line Re = ( ' '
= 3.29x10' (29.25)(035) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for pipe aging.
30" DIA, Commercial Steel Pipe = 0.00034 (Ref 5)
- f = 0.015 (Ref 5)
____ _____m_ _ _ - _ _ . _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ . . _ _ _ . . _ _ _ _ - _ _ _ - _ . - - - - , . - -.
- CALCULATION M-51-62, PAGB 26 l ev's L
AP3e= 0.000216(0.015)(152)(60.57)(11000)*
[ (29.25)5
= 0.169 psi ECR # LG 97-03058
^ of og AP of Suction Strainer Actual Diny AP @ 11,000 gpm @ 180 *F = 7,11 ft H2 O (Ref 13) l Maximum Allowable Dirty AP @ 11,000 gpm @ 212 *F = 12 ft H2 O (Ref 11 and Ref 13)
Convened to 180 *F = (12)(59.81/60.57) = 11.85 ft H2O
- Total Suction Line Friction losses
[ h3 = AP24 . + AP3 o. + APmsg Based on Actual Strainer Dirty AP:
h3 = (1.77 + 0.169)(144/60.57) -F 7.11 = 11.72 ft H2O Based on Maximum Allowable Strainer Dirty AP:
h3 = (1.77 + 0.169)(144/60.57) + 11.85 = 16.46 ft H 2O Static Head
~
h,, = Min W.L. @ Suppression Pool - Elevation @ Center Line of Pump Suction Nozzle h,, = 199.96 ft - 174.875 ft = 25.085 ft MODE A-2 NPSHA .
j
- NPSHA = h, - hy , + h,, - h3 NPSHA Based on Actual Strainer Dirty AP=
- (14.7 - 7.511)(144/60.57) + 25.085 - 11.72 = 30.46 ft H2O
' NPSHA Based on Maximum Allowable Strainer Strainer Dirty AP=
(14.7 - 7.511)(144/60.57) + 25.085 - 16.46 = 25.72 ft H2 O RHR Pump NPSHR @ 11,000 gpm = 6 ft H2O (Ref 10)
NPSHA > : NPSHR l
n-
CALCULATION M-51-62, PAGE 27 RO' C
- 3. ' CALCULATE NPSHA FOR MODE "B" (REF.1)
Operatine Conditions es .
06'og Flow = 10,000 gpm Temperature = 212*F '
. Specific Weight @ 212*F = 59.81 lb/ft' (Ref 7)
Minimum Suppression Pool W.L. Depth = 18.04 ft (Ref 2)
Mmimum Suppression Pool W.L. Elevation = 199'-11%" (Ref 2)
Pressure @ Suppression Pool = 14.7 psia (Ref 1)
Vapor Pressure @ 212'F = 14.696 psia (Ref 7)
Pump Suction Elevation = 174.875 ft (Ref 3)
NOTE: Equations for NPSHA, AP, and Reynolds Number are defined in the section of this calculation evaluating Mode A-1 (see page 21 and page 22).
AP O 24" Line p = absolute (dynamic) viscosity.in centipoise = 0.29 @ 212
- F (Ref 5)
Re = (50.6)(10,000)(59.81) = 4.49x10' (23.25)(0.29) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for pipe aging.
24" DIA, CastIron Pipe = 0.0004 (Ref 5)
' f = 0.016 (Ref 5)
AP . = 0.000216 (0.016)(474.5)(59.81)(10,000)2 3
(23.25)5
= 1.44 psi AP O 30" Line '
l l= }( }( }
-Re=( '
= 3.57x10' (29.25)(0.29) c/D (Relative Pipe Roughness)
Use Cast Iron Pipe to account for pipe aging. .
30" DIA, Commercial Steel Pipe = 0.00034 (Ref 5) f = 0.015 (Ref 5)
- _ _ _ _ - _ _ _ _ _ _ _ _ - _ _ _ - - _ _ - -- _a
CALCULATION M-51-62, PAGE 28 d26Y r AP, = 0.000216-(0.015)(152)(59.81)(10,000)'
(29.25)5
= 0.138 psi , EcR # LG 07-0305 Vh' A GE /69 OF AP of Suction Strainer -
Maximum Allowable Dirty AP @ 212.5'F @ 11,000 gpm = 12 ft H O 2 (Ref 11 and Ref 13)
For Mode B the strainer pressure drop @ 212
- F @ 10,000 gpm is needed.
The AP associated with the strainer consists of normal system losses and bed losses (the layer of debris consisting of fiber and corrosion products). When adjusting the AP for various flow rates the system losses are proportional to the square of the flow rates while the bed losses have a linear relationship to the flow rates (Ref 14).
- From Reference 13 the actual system losses are 2.85 ft @ 213 *F @ 11,000 gpm. Therefore it is assumed the maximum specified di2ty AP of 12 ft from Reference 11 allows for 9.15 ft for bed losses.
Therefore the Maximum Dirty AP @ 212
- F @ 10,000 gpm is:
(2.85 ft)(11,000s+ (9.15 ft)(11,000s= 10.67 ft R O 2 NOTE: The strainer AP obtained from Reference 11 is based on 212.5'F and 11,000 gpm.
The actual system losses obtained from Reference 13 is based on 213 *F and 11,000 gpm. The Mode B operating tempenture is 212
- F (Reference 1). The difference in temperature is considered negligible based on the insignificant change in water properties between 212
- F, 212.5 ' F, and 213
- F which wotild have no impact on NPSHA.
-Total Suction Line Friction IAsses hf , = AP24. + AP3o. + APmmga hr, = (1.44 + 0.138)(144/59.81) + 10.67 ft = 14.47 ft H 2O l
CALCULATION M-51-62, PAGE 29 stel C Static Head h,i = Min W.L. @ Suppression Pool - Eevation @ Center Line of Pump Suction Nozzle h,, = 199.96 ft - 174.875 ft = 25.085 ft ECR # LG 97-03058 MODE B NPSHA p //d OF NPSHA = h, - hy , + h,i - h 3 NPSHA = (14.7 - 14.7)(144/59.81) + 25.085 - 14.47 = 10.62 ft H 2O RHR Pump NPSHR @ 10,000 gpm = 5 ft H2O (Ref 10)
NPSHA > NPSHR The GE RHR Process Diagram (Reference 1) requires the NPSHA at the pump suction nozzle to be 210.3 ft plus the difference in elevation between a reference location and the centerline of the pump suction nozzle. Reference 1 defines the reference location as 2 ft above the pump mounting flange. From Reference 12, the RHR pump mounting flange is at Elevation 177 ft. J Therefore, based on the requirements of Reference 1, the NPSHA must be 214.43 ft (177 + <
2 -174.875 + 10.3). From above, the RHR piping arrangement only provides 10.62 ft.
Although the NPSHA does not meet the generic design requirements specified in Reference 1, NPSHA is considered acceptable based on the actual as-built pump vendor requirements in 3 accordance with Reference 10. '
l
. R CALCULATION M-51-62, FAGE 30 i
Rey'C
-4. NPSHA Marnin For Mode B Based On Actual Dirty Strainer AP The RHR System operating in Mode B is the limiting accident mode for NPSH, therefore the NPSHA margin based on the Actual dirty strainer AP will be based on Mode B conditions.
RHR Mode B NPSHA = 10.62 ft H 0.@ 2 10,000 gpm'@ 212 *F (page 29 of this calculation)
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 NPSH margin based on the actual dirty strainer AP. Therefore, the above NPSHA will be adjusted to obtain the NPSHA based on the actual dirty strainer AP:
NPSHAw og = NPSHAr.,.2, + Maximum Allowable Dirty Strainer AP - Actual Dirty Strainer AP Maximum Allowable Dirty Strainer AP @ 10,000 gpm @ 212*F = 10.67 ft H 2O (Page 28)
The Actual Didy Strainer AP is obtained from Table 3 of Reference 11:
Actual Dirty Strainer AP @ 11,000 gpm @ 213
- F, however the actual Mode B tempemture is 212
- F. This l'F difference is considered to have an insignificant affect on the strainer AP based on the insignificant change in water properties from 212
- F to 213
- F.
Adjusting Actual Dirty Strainer AP adjusted to 10,000 gpm:
As previoulsy stated the actual dirty strainer AP consists of strainer system losses and strainer bed losses. From Reference 14 the system losses are proportional to the square of the flow rates while the bed losses have a linear relationship to the flow rates.
Therefore the Actual Dirty Strainer AP adjusted to 10,000 gpm: ;
/
10'000 f10'000' (2.85 ft)(11,000s+ (3.75 ft)(11,000s= 5.76 ft H O 2 Therefore, NPSHAmin;, = 10.62 ft + 10.67 ft - 5.76 ft = 15.53 ft H 2O ECR # LG 97-03058 yM / OF j l !
l l L .
7----
CALCULATION M-51-62, PAGE 31
- dV f
> Determine NPSHA Margin:
(-
! NPSHA Margin = NPSHA%ipiny - NPSHR L
l NPSHR = 5 ft H 2O @ 10,000 gpm (Reference 10)
I Thenfore, NPSHA Margin = 15.53 ft - 5 ft = 10.53 ft H2O Therefore, them is sufficient margin between the RHR Pump NPSHA and the NPSHR when considering the actual dirty strainer AP of the new large capacity passive strainers.
ECR # LG 97-03058 ATTAC AGE MS OF
?
0 l
1 4
ATTACHMENT 2 Limerick Generating Station, Unit 2 NPSH Analysis Core Spray System
)
1 I
I I