ML20094P721

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Clamp Induced Stress on Hope Creek Main Steam Piping Lines C & D
ML20094P721
Person / Time
Site: Hope Creek 
Issue date: 07/27/1984
From: Farrell C, Jacqueline Thompson, Zaliznyak M
GENERAL ELECTRIC CO.
To:
Shared Package
ML20094P713 List:
References
170-109, NUDOCS 8408170342
Download: ML20094P721 (22)
v • d • e


Text

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3 ODELAL ELECTRIC CIWANY CUW lWWED STRESS Of HOPE OtER MAIN STIAN PIPINO LiMS C ACC D JULY 27,1984 DESIGN MMO #170-109 PREPARED BY:

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M. A. ZalIjoiak, h ineer Plant Piping Analysis 1 ItEVIEWED BYs C. A. Farrell, Engineer Plant Piping Analysis i APPROVED BY:

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m. ~ s M.n Plant Piping Analysis i DRF 221 40 M7-1 0400170342 040014 PDR ADOCK OD000354 G

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TABLE OF CofffS8tf8 r

1.8 BASIARotse 2.0 MeredE 3.0 Dl8CUS$1011 j

3.1 Primary Membrane 3.2 Primary Membrane Plus Bending

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3.3 Stresses Due to Belt Preloed 1

3.4 Clamp Design Criterte l

3.5 telt Loosening Protection r

l, 3.6 Stress Due to Constraint of Expension from Internal Pressure 3.7 Stress Due to Cenetraint of Of f forential Thersel Expansion 3.8 Fatigue Usage 3.9 Clmps on Elbows Appendia A Main Stese Line C Results kl Itede Olegru with Clamp Locations k2 Clasp Assembly Properties

  1. 3 Load ComtInstions l

k4 Clamp induced Stress, Preloed Stress and Fatigue k5 Mighest Clamp induced Stress intoneltles I

Appendla O Main Steam Line 0 Roults bl IIede Olegram with Clasp Locations

> $ Clamp Assembly Properties

>3 Lead C W inettons

>4 Cleep induced Strees, Proloed l

Strees and Fetigue

>9 Highest Clamp induesd Stress intenettles Appendia e 1810 Informatten hotles 43-40

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l 1.0 BA0t81018e ASIE lit requires Met Me offacts of sttachment la produclig Mermal stresses, stress eencontretlen and restreints en pressure retalning members shall he taken iste secount la cheding for onepliance with strees criterie.

0 8-3645)

Attachments to pIplag are generally categerlaed as Integral attachments and non-f atogral attachments. Lugs and stanchiens welded to the pipe well are examples of latogral ettechnents. Clamps used for etteching i'

hengers and snubbers to the pipe by belting are nee integral ettechnents.

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l The design reports propered by General Electric specifically address local stresses et Istegral attachments (lues) If Me loeds on the lug are l

l significant. Rules for evaluating local stress et lues have been defined by A88E Code cases N122 and N3tt. GE camputer pro 0rans evaluate local i

stress et legs In a menner consistent with Mese Code cases.

In November of 1983, the Nuclear Regelstery Committee issued IE Inferestien Notice 83-00: Use of Speciellaed 'Stiffa Pipe Clamps, (AppendIn C). The Information notice Identified three concerns with l

l stiff pipe clamps excessive belt proloed laduced stresses in the pipe, smell clamp contact bearing areas that eeutd Induce local overstress and i

the of fact of clamp en elbow stress Indloos. Although no response was 1

required from the notice, the issue ses raised in question 210.53 of the Hope Creek final safety enelysts report. The response to the question committed to evaluate the ef fect of stif f clamps on the piping.

[

2.0 P W OSE This analysis evaluates the stresses laduced by E-5ystem cleeps attached j

to the main steen piping in General Electric's scope of supply.

3.0 OlSCUS$10N l

The Code does not have rules for the evolustion of non-latogral sttachments: however, methods consistent with the Intent of the Osde have

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l been developed to address the concerns of Inforestion Nottee 83-00 and i

the Cods.

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3.1 Primary h ana ifranaan l

The oilstence of a pipe clamp will not of fact he calculetten for minimum l

wel1, la fact, membrano stresses in Me circumferentiel diractlen due to pressure will be less in the vicinity of the clamp then la the areas sesy frem the sleep. The primary membrane stress is less then Met of j

efreight pipe due to sleep reinforcement of offactive thickness.

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1 3.2 Prf-- 7 "

  • maa plus Prf-- w "--Mina !ttra-Equation g is aimed at preventing collapse of N piping system due to loods that produce primary stresses. Collapse is prevented:by keeping the stresses due to pressure, deed weight, and inertia offacts of dynamic feeds to less than prescribed values. The existence of clamps on piping systems do not adversely affect the moment carrying capablitty nor do j

they reduce the ability of N piping system to resist collapse under i

I combined loadings that produce primary stresses.

The only concern is %e loading transmitted from the snubber through the clamp pad to N pipe. This bearing load will result in local stress in the pipe wall. These stresses are conservatively calculsted using the Indice method and added to W membrane and overall bending stresses computed by equation g of the Code.

3.3 Strasses Dge to Prained When the clamp is initially installed ch the piping system and the bolts are tightened, h proloed will produce stress in he pipe wall. The stress produced by proloed is applled one time and produces a stress of only one quarter cycle. Stresses of this type need not be included in h stress evaluations required by 2-3600. Although bolt proloods are not addressed under %e Code, bolt preioeds could result in damage to a pipe if a clamp was poorly designed. Calculations have been made to ensure that bolt proloods could not result in local plastic deformation of the piping.

3.4 Clamo Design criterla The stiff type clamps vers designed to provide a high strength attachment for the pipe which would not slip and would fit on the mallest practical length of pipe. Clamp design of the strap type are too wide to fit in many locatices and require lugs to hold them in position. The stiffness of a compact high strength clamp is inherently greater than that of a i

strop type. General EloctrIc specIfIcetIons requlre that alI ciamps be significantly sttifer than the snubber attached to it. The stiffness requirement does not govern he design of stiff type clamps.

3.5 Prgtect1GILir.m.100Sanlag in order for h clamp to hold its pos! tion during vibratory loads, it must grip the pipe with enough force to prevent sliding. The two mechanians for clamp loosening are loss of tension In the bolt due to nut backing off and bolt stress relaxation. To prevent backing off of the nuts, all bolts have double nuts. The bolt meterial selected for the clamp is an A490 type commonly used for flange bolts. This meterial was selected because et he temperatures of concern, It is resistent to relemation.-

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3,6 t#== P- - $n P--hala+ af rv-alan frem in+arnal Praamura Clamp laduced stresses caused by the constraint of pipe expansion due to laternal pressure have been added to other operating secondary and and K Indicos for the clamp.

peak stresses by calculating special Cy y

3.T th== % +a nan. u ain+ af nIfferan+ tai Thermal rvanneran :

Clamp induced stresses due to differential temperatures and material expansion coeffIclents have been accounted for by computing special C3 and K Indices for h e clamp. The stresses have been added to other s

operarlag secondary and peak stresses.

3.8 Fatfque ilsana The fatigue usage at each clamp location has been consorystively computed taking into consideration clamp induced stresses from pressure, temperature and snubber loadings. The clamp induced stresses were added to the stresses computed for each load set using equation 10 and 11 of 2-3650. Cumulative fatigue usage was computed by the rules of the Code.

3.9 Cfamos cr. Elhans Some claps are located on or near the ends of elbows because of lack of space. Clamp loadings on elbows due to snubbers, Internal pressure and differential expansion are similar to or less than those on straight pipe. The mejor dif ference between a clamp on straight pipe and on an elbow is the coupling between the pipe bending and the clamp loeds due to elbow ovalization. The clamp tends to resist ovalization by stiffening the pipe well. This local stiffening results in three effects: a slight stif fening of the elbow in bending, a slight reduction In overall elbow bending stress and a local stress concentration at the clasp pad. The first two effects are small and can be neglected in a stress analysis.

The local stress concentration at the clamp pad is caused by the pad preventing the local region of elbow under It from assuning the ovalIzetion curvature. This local resistance to curviture causes the stress concentration by crimping the pipe wall. Sendir.g Indices C,and and K, for elbons with clamps have been calculated to account for this secon8ary stress concentration effect.

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FIC.URE A-1 N00E DIAGRM FOR MIN STEM LINE C i

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r 8788843

- ELECTRIC CINIPAMV SPEC MS.

SSA MEV. fe. S SSILife WATER REACTWR SYSTEMS DEPAftTMENT IWPE CAEEK 048 0 MAIN STEAM C TDE LSADINS 0198400A71880 USED P0ft THE ANALYSIS es 1see AftE AS FOLLOW UESteII 1 PO + WY1

+ MER i-LEWL B 1 PP + WT1

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+ Seitf(ISMI seet LEWL B 3 PP + WT1

+ SSftT((API leet

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i eseleTEsos ALL UNITS AftE IN POU0 DSS, EffCHES EMCEPT NOTED 1

seefetTEmme IP 900 USEft ifMIT PftESSuftE Felt EACH LSAO Copef MATION, PEAK PftESaultE WILL M USED FOR LEVEL 5,8 AIS D 4

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8738843 G

OEMIRAL ELECTRIC COMPA8W SPEC MO.

RSA REV. 800. 0 SelLIIe tdATER SDEACTOft SYSTEMS OdPARTMENT 4

HOPE CAEEK MS C MAIM STEAM C 00 EAR 0000E Old.

MDe 36.000 SDo 23.664 To 1,198 le 6986.7 Ze 937.4 31 a 0.50 Cle 1.49 CRs 1.00 CSe ?.SS C3's 0.50 SS e 1.00 Kim 1.00 Kte 1.00 r.3 e 1.00 STRESS Out TO LUS See 014.

SSCa AftE INCLUDEO A. PftlftAflV STHESSES EEcuATION 93 SEltVIM Cefe. PflESSUftE SEMOl005 AND TOTAL ALLOWASLE STHESS LEVEL seB.

StatESS TOftsteet STftESS STRESS STitESS RATIO 4

OESIGft 1

7018.

1044.

9630.

RSSSO.

0.999 l

LEWL B l

7908.

1285 12509.

39880.

0.398 LEWL 5 a

7908.

10el.

10684.

39860.

0.334 LEWL C 9

7905, 395 9372.

39425.

O.SSS i

l LEWL 0 1

7908.

1718.

12849 93800.

0.242 t

LEWL D R

7808.

1081.

19078 83100.

0.200 i

LEWL D 3

7906.

1969.

18400.

93800.

O.347 B. PfttttAlIY PLUS SECONDAftY SEOUAT 109 1 S 68322.

93100.

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l C. SECONDAltY STflESS ftANSE (EcuATION 12) 1 13 2834.

53100.

0.083 l_

S. PRiftA PLUS SECO EMC TH EMP (EGUAT 13310 IS 30828.

53100.

0.977 E. CLApr FRE-IALD STRESS 7277.

27052.

0.269.

l 0.I29 1.0 0.129 l

F. CUBRIIATIVE USAGE FACTOR l*

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e OEMRAL ELECTRIC COMPANW SPEC 000.

ESA MEV. 900. 0 SSILites HATER REACTOR SYSTEMS DEPARTMEMT IMPE CAEEK MS C MAIM STEAM C NEAR MODE 038.

4 SDe 26.000 ids 23.844 To 1.188 1 S986.7 Ze 337.4

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32 e 1.01 Kle 3.00 KS 1.00 x3 l.00 STRESS OUE TO LUS SOS 031.

SSC4 ARE INCLUOE0 i

A. PIllftANY STRESM S (EOUAfteN SI MHWIM Cops. PM SSURE SEND 1les AND TOTAL ALLOWASLE STMSS LEVEL NO.

STIIESS ToftslON STHESS STRESS STMSS RATIO l

MSIGN I

70lef.

2028.

18747.

26560.

0.708 1

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7908.

2123.

19735.

31880.

O.Sl9 LEWL 5 2

7806.

2170.

20285.

31860.

0.637 LEWL C I

7908.

1907.

12907.

39825.

0.324 4

j LEWL D 1

7508.

2123.

19735.

53100.

0.372 7

LEWL 0 2

7505.

2870.

20285 53100.

0.382 LEWL D 3

7508.

2372.

20993.

53100.

0.398 l

S. PftlMANY PLUS SECONDARY (EOUAT 103 i S 79444.

53100.

S. SECOBSARY STItESS ftANSE (EOUATION 123 1 82 8839.

53900.

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s. PasetA PLUS SECO ExC TH Ene staunT 138 0 13 32889.

est00.

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27052.

0.269 E. G.Alf FRE-t m n STRESS 0.327 1.0 0.327 F. QSSIL&i1VE USAGE FACTOIL l~

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C7sS843 OEmnAL ELECTRIC COMPA88V SPEC MO.

RSA IIEV. 800. 0 e

t SSOLIDS teATER REACT 0ft SYSTEftS DEPARTPENT l

900PE CREEK 008 C 58tANCN CONNECTIONS 90 EAR 900DE 037.

SDe SS.000 les 23.684 Te 1.154 le 8944.7 Ze 937.4 31 e 0.50 Cle 1.37 Cte 1.50 C3e 3.82 C3's 0.90 SE e 1.08 Kle 1.00 K2e 1.00 K3e 1.00 STflESS OUE TO LUS See 037.

SSCS AftE 100CLUDEO i

A. P8liftANv STftESSES (EcuATISIG Si SElIWICE Corp. PftESSURE SE881000 AND TOTAL ALLOWASLE STHESS i

LEVEL NO.

STitESS 70ftslON STRESS STitESS STRESS RATIO

.ESi.n i

70ie.

iiO.

i3SSO.

=990 0.Sie i

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7908 ISS7.

17298.

31840 0.943 i

LEWL 3 2

7908 IRSS.

14999.

31880 0.469 LEWL C l'

7908.

SSS.

11110 39829.

O.279 LEWL 9 1

7908 ISS7.

17377.

93100.

0.327 LEWL D R

7908 1284.

19040.

83100.

0.284 l

LEWL 0 3

7908 1438.

18480.

53900.

0.394 i

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o. PalnAny PLuS SECONnAny IEcuAT 109 1 9 S4983.
SS100, i

C. SECOldhANY STilESS IRADISE BEOUATIODI 12) 1 It 12989.

83100, 0.244
9. PflinA PLUS SECO EMC TH EMP IEcuAT 13910 la RSSSI.

SS100.

0.584 E. CLAMP PRE-LOAD STRESS 5890.

27052.

0.218 i

l F. CtBSILATIVE USAGE FACTOR 0.195 1.0 0.195 i

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Table A-4.5 1l

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Highest Cicap Indue:d Stress Ir.tensitics Hope Creek Main Steam Line C Highest

']I Identification of Location Calulated Allowable j

Ev usted(1) of H @ st Stress Points I ctor Limits

  • )fp, Allowed Comb. Ho.

Primary St mss E

1 18747 26550 0.706 1

SSC4. Header tion Primary Stress Eq 9 < 1.8Se 41.5Sy Servici Level 5 20285 31860 0.637 2

SSC4. Header Primary Stress Eq. 9 <2.255m & 1.8Sy Servidi Level C 12907 39825 0.324 1

SSC4. Header Primary Stress Eq. 9 < 3.0Sm Service Level D 20993 53100 0.395 3

SSC4. Header (3)

Primary plus Secondary SSC4. Header Eq.10 < 3.0Sm 71444 53100 1.345 SSC8 Header 12 % 5 53100 0.244

},resses Primary plus Secondary Stress without Thennel SSC4.' Header Expansion 32851 53100 0.619 Eq.13 < 3.05m i

Cumulative Usage Factor SSC4. Header 10 0.327 1.0 0.327 l

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il(1) All equations used are from ASE B&PV Code. Sec. III - NS-3650.

(3) Eqn. 10 triggers fatigue usage calculation using low cycle fatigue method. Since I(2) See Table A-3 fatigue usage is within allowable.,the higher Table A-5 ratio is acceptable.

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- ELECTRIC OSFA8W SPEC MS.

RSA IEEW. 800. S SSELIIIS tAATEft AEACTest SYSYets OEPARTVEftf ISPE CAEEK 008 O MAIN STEAM 0 ftS LSAD8000 018e1004T8900 USED Pelt T9E AllALYSIS se toes AnE AS PgLLew i

SEsteII 1 PO + WTl

+ MI LEWL 5 1 PP + WTl

+ SeftT( teBER lost

+ t TSV last I

LawL S a PP + WTl

+ 8eftTt itBEl last

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+ SGftT(tAPI last

+ ( SSEl leeg

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ese0ESTEsse ALL UBIRTS ARE IN Pouses,180CHES EXCEPT TESTED iF 000 USER IIS'UT PftESSUIIE FOlt EACH LSAO ColeIteATION, PEAK Pumm WlLL SE USED PWR LEVEL S,4 A8S S j

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7 9789H3 SEMAAL ELECTSGC CENAffV SPEC 009.

RSA IIEW. 900. 0 SSIL1000 uATER REACTOft SYSTEftS DEPAft190ENT j

DISPE CAEEK MS O ftAIM STEAM D ftEAR SGSSE 039.

1 SDe SS.000 lDe SS. SN To 1.188 to SSSE.7 2 937.4

<l j

30 = 0.90 Cte 1.52 Cte 1.90 CSa t.SS C3's 0.90 BR e 9.09 Kle 1.00 KRe 1.00 K3e 1.00 STMSS SW TO LUS SOS 039.

Seed AftE INCLUDE 0 J

A. PRIftAftY STHESSES (EOutTidII St I

SElIWICE COPS. PRESSURE SENDISES AND TOTAL A8.LOWASLE STRESS LEVEL 00 3.

8TitESS TORSItye aTRESS STftESS STitESS RATle i

eESean i

70s..

ns.

Sur.

mSSO.

0. S=

]

LEWL 3 1

7909.

1986.

9877.

3:480 O.304 LEvL e a

7906 es4.

tis 79, s:SSO.

0.s8s LEvt c 1

750s.

87n.

t8334 sesaS.

0. ASS LEWL B t

7966.

fIOS.

9787.

ti3900, 9.t84 j

i LEWL D 3

7909.

t020.

11837.

S3t00.

O.299

}

Levo o a

7909.

140.

tiend.

Ssi00.

0.ma4 B. PftIftAftY PLUS SECONDAftY tEOuAT tot 1 S 608tt.

93300 C. SECONDARY STIIESS ItA00SE tEOUAT10M 13)t3 SS 7284.

93100.

O.137

e. PAsetA PLuS ScCO Exc Tee axP stouAT tan to 13 atta7.

83100.

0.886 l

7277.

27052.

0.269 E. G.Alf PRE-LOAD STRESS I

l F. CttelLATIVE USACE FACTOR 0.165 1.0 0.165 1

1 I

i i

Table 3-4.4

Highest Clamp Induced Stress InteIsitics Hope Creek Hain Steam Line D

(

Highest N

Identification of Location

)

of H W st Stress Points Calulated Allowable j

ustd (1) ctor Limits Allowed Comb. No.

~

afp/

3

}

Primary Stress Eq. 9 < 1.55m Design Condition 9578 26550 0.361 1

S501. Riser Primary Stress Eq. 9 < 1.85m & 1.5Sy Servic'E Level 8 12313 31860 0.386 2

S503. Header Primary Stress Eq. ? < 2.255m & 1.8Sy h..

Servid Level C 11819 39825 0.297 1

5503. Header i

Primary Stress d

Eq. 9 < 3.05m Serv 1G Level 0 13393 53100 0.252 3

55D2 Riser Primary plus Secondary (3) 5503. Header Eq. 10 < 3.05m 62434 53100 1.176

'~

i 5504. Header Secondary Stresses 7284 53100 0.137 l

Eq. 12 < 3.05m Prtenry plus Secondary i

Stress w1thout Thermal S504," Header Espansion 31127 53100 0.586 l.

Eq. 13 <_3.05m l

Cumulative Usage Factor 0.175' 1.0 0.'175 5503. Header U < 1.0

~

(1) All equations used are from ASE 8&PV Code. Sec. III - H8-3650.

(3) Eqn. 10 triggers fatigue usage calculation using low cycle. fatigue method. Since (2) See Table 8-3 fatigue usage is within allowable, the higher Table B-5 ratio is acceptable.

l i

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