ML20126F960

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Forwards Info Re Facility FSAR Relative to CEDMs
ML20126F960
Person / Time
Site: Waterford 
Issue date: 03/19/1981
From: Hofer G
LOUISIANA POWER & LIGHT CO.
To: Keblusek S, Scott Moore, Terao D
NRC, OAK RIDGE NATIONAL LABORATORY
References
L-LOU-81-86, NUDOCS 8103240357
Download: ML20126F960 (18)
v • d • e


Text

.,

March 19, 1981 L-LOU 8 6 File:

14Q-R-9C

,([y TO:

S Kebiusek (NRC)V D Terao (NRC)

S Moore (Oak, Ridge

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FROM:

G G Hofer

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3jggle

SUBJECT:

LOUISIANA P' RM LIUfl COM ANY h v.kgj WATERFORD SES UNIT NO 3

CLARIFICATION OF.MEB ITEMS 50,

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52 and 56 4

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Please find attached additional information for MEB Items 50, 52 and 56.

This submittal should close out these items, i

If there are any questions, please do not hesitare to call me at (212) 839-3806.

CH:eco Attachment.

cc:

R K Stampley M A Pierson R F Devine K Fojt J P Padalino W Wittich JK Tompeck R W Prados (LPL)

J C Saldarini H B Mulliken (CE)

M P Horrell R Simeti (L-LOU-81-86)

JB Hart Daybook R M Foley E Olizon (C.18.9)

M Farr h

1 5

I I

l THIS DOCUMENT CONTAlf1S 1810324O M 7 POOR QUAUTY PAGES A

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Reply to Additional NRC Comments on Waterford-3 FSAR Relative to CEDM's (112240) l The fallowing information responds to additional NRC comments covering the design, analysis, and testing of the CEDM's as described in the Louisiana Waterford-3 FSAR. The " Item" numbers are SER references.

A.

Additional NRC Comment on Item 50:

At the meeting with C-E and Ebasco on October 2, a copy of calculated stresses and code allowable stresses was shown to us. The highest value of stress limit shown was 99.9 ksi for the motor housing.

1.

What is the value of Sm on which this is based?

2.

Can we have a copy of the data that was shown to us, so we can review it?

3.

What are the materials?

The last sentence of the proposal resolution should include the following words:

"for non-pressure parts."

Reply:

I 1.

Subparagraph NB-3222.2 of Section III of the ASME Soiler and Pressure Vessel Code requires that the stress intensity derived from the primary-l plus-secondarv stresses be less than the limit of 3 Sm. The design i

stress intensity Sm is given in Tables 1-1.1 and 1-1.2 of Section III of the ASME Boiler and Pressure Vessel Code. The values of Sm for the material of the motor housing and temperatures encountered in this analysis are also given in the following table:

Design Stress Intensity, Sm (ksi) l s

Temperature, OF l

Material Type 700 100 2000' 3000l4000!5000l6000l6150 l

I SA 182 F403 33.3 33.3 33.3' 33.3 32.5 31.4 30.6 30.4

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2-2.. A copy of the data that was shown at the meeting with C-E, NRC and Ebasco on October 2 is attached to this memo as Appendix A and 8.

3.

The materials for the various CE0M components are listed in Section 4.5.1 of the Louisiana Waterford-3 FSAR.

4.

The revised FSAR Subsection 3.9.4.2 still retains a description of the requirements for pressure boundary materials in addition to the revised sentence on non-pressure boundary raterials. Therefore, it is suggested that the words:

"for further discussion of design requirements on CEDM pressure boundary and non-pressure boundary components", be added to the last sentence of C-E's response to Itom 50.

B.

Additional NRC Comment on Item 52:

The proposed resolution covers the effects of distortier.. What are the effects of changes in pressure drop?

Reply:

As already described in the resolution for Item 52, changes in pressure diop will not affect operation of the rod drives.

The calculations of the magnitude and duration of the pressure wave associated with a small break shows that the pressure wave pulse lasts less than.03 seconds.

C.

Additional NRC Comment on Item 56:

The proposed resolution covers lifetime. What is the effects of the increased travel on the drop time?

Reply:

The response to Item 55 describes scram times for the 150" motor assembly.

All scram times for the 150" motor assembly were less than the allowed maximum of 3 seconds.

RFZ/dy Attach.

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APPEtIDIX A Contents:

Pages A1, A2 and A3

- Sheets 2, 3, and 4 of C-E Calculation RS-001,

' Tentative Structural Sizing for the CEDM Housing" A4, A5 and A6 Sheets 1, 2 and 3 of C-E Calculation RS-002, " Structural Analysis of the CEDM Housing - Ball Seal Housing and dpper Pressure Housing" A7, A8 and A9 Sheets 1, 2 and 3 of C-E Calculation RS-003, " Structural Acalysis of the CE*JM Housing - Motor Housing to Upper Pressure Fittings and 'totor Housing Tube" j

A10, All and A12 Sheets 1, 2 and 3 of C-E Calculation RS-004, " Structural Analysis of the CEDL' Housing - Motor Housing Lower End Fitting" s

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ABSTRACT

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Presented in this report are the tentative sizing calcula, ions for all pressure containin6 parts of the CEDM housing assembly for dasign, emergency, faulted and test conditions.

These calculati ons are basically a determination of the primary membrane and primary m'embrane plus bending stress int,ensities.

The results are evaluated by comparing these stress intensities with the limits of the 1971 ASME aciler and Pressure Vessel Code,Section III for Nuclear Vessels All stresses are satisfactory and' meet the appropriate allowables in the ASME Code.

2.

SlOMIFICANT RESULTS

)

Omega Seals The' table on the next page su=~arizes the results for the four omega seals on the CEDM housing.

The omega seals are labeled as follows:

A.

The seal between the ball seal housing and the housing nut.

B.

The seal between the ball seal housing and the upper housing assembly..

C.

The seal between the upper housing assembly and the motor housing assembly.

D.

The seal between the motor housing assembly and the CEDM nozzle.

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IUTRODUCTIO'I l

The pressure retaining components of the control element drive mechanism (CEDM) are desigred according to the rules cf Cte 4JM5 Cc.is. Under these rules prin:o ry stross. intensi ty is limited for design, emargency, faulted and test condi-tions, while primary-plus-secondary s tress intensitics _ and l

peak stress intensities are limited only for normal. and upset co.2ditions.

Consequently, it is convenient to separa te the analysis and evaluation of the CEDM housing into t>:o dis tinct tasks: (1) a hand calculation of the primary stresses in the housing cnd an evaluation of the resulting stress intensities; and (2) a finite element l

analysis of the primary-plus-seccndary stresses and' peak stresses due to norma 1 and upset conditions and an evalus.-

l tion of :he resulting stress intensities.

t Furthermore, the geometry of the CEDM assembly c

t.shes it possible to divide the. structure into t

three regions, separa ted by long cylinder distances, and to independently calculate the pri:.ary-plus-secondary (ar.d v

peak) stres.ses in each regien.

As a result of these con-Ii siderations, the analysis of the CEDM asse=bly is presented l

,l in four dis tinct calculations.

Calculation RS-001, 1s a tentative sizin6 and primary stress analysis j

  • for the entire CEDM assembly.

Calculations RS-003 and RS-004, are primary-plus-secondaiy i

stress analyses of two of these three independent regions,:

p' (1) the motor-housing-to-upper-pressure-housing-fitting i

I region, and (2) motor-housing-to-lower-end-fitting transi-

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tion region.

l j In this report, CE Calcula tion RS-002, the third indepen-

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dent regica noted above, the ball seal housing and upper pressure housing region, is analyzed for primary-plus-Secondary stresses and poah stressCS duc l'O the normal and ll upset cenditions, Internal

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operating pressure,. opera ting tempera tures, opera ti:1g basis ca rthquaho (0112) loads, dead weight, and t.cchanien1 cr.eitation loads are con..hicrod.

The recul ting s tress

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Jnt.chsitics a re evalunted necording to the applicable 5

criteria.

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The si6nificant results of this investigation are su==aiized in See tion II of this report.

Soction III describes the

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structural geometry and loading of the CEDM asnembly and j

sur..marizc's the applicable design eriteria,

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II.

SIG!!IFICA'd' RESULTS i

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The stresa evaluation shows that all stress intensities and usage factors tee t the recuirements of j

Sec. tion III of the 1971 ASI2 Boiler and Pressure vessel

Code, for the normal and upset conditions.

The, table below summ rizes the results of the pri=ary-plus-secondary s tress analysis and evalua tion.

i Summa ry of Primarv-Plus-Secon?.ary Stress Intensities Pri.::ary-Plus-Secondary Stress Intensity Stress (ksi)

Limits Max.

ASI2 Structural Stress Code Region Int.

Loc.

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. table below:

Summary 6f Peak Stroce Intencitica and Fatinuo Usane Factors l

Total Stress (ksi)

Fatigue Usage.

Max.

Usage Factor St::uc tural Stress Region Int.

Location,,

U Allowable u

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Cut 6 Lower Oteg 23.S

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IllTRODUCTICII The pressure retaining ecmponents of the control element drive mechanism (CECM) are designed according to the rules of fhe Mn5 rede.

Under these rules primary stress intensity I

is limited for design, emergency, faulted and test condi-tions, while primary-plus-secondary stress intensities and peak stress' intensities are limited only for normal and 3

upset conditions.

Consecuently, it is ccnvenient to i

separate the analysis and :valuaticn of the CEEM housing l

into two distinct tasks: (1) a hand calculation of the i

~

primary stresses in the housing and an evaluatien of tha i

resulting s ress intensities; and (2) a finite ' element analysis of the primary-plus-seccndary stresses,and peak stresses due to normal and upset conditi ns and an evalua-tion cf the resulting stress intensities.

~

Furthe rmore, the geccetry of the CECM assembly makes it possible to divide' the structure into three regions, separated by long cylinder distances, and to independently calculate the primary plus-secondary (and peak) stresses in each region.

As a result of these cen-l siderations, the analysis of the CE1:M assembly is presented in four distinct calculations.

Calculation RS-001, is a tentative sizing and primary stress analysis for the entire CEDM asse bly.

Caletlaticns RS-CO2 anc.

RS-004, are prin.ary-plus-secondary stress analyses of two of these three independent regions:

(1) the ball seal housing and ball-seal-housing-to-upper-pressure-hcusing transition, and (2) the motor-housing-to-lower-end-fitting transition region.

In this report, CE Calculation RS-CC3, the third independent region noted above, the motor-housin3-to-upper-pressure-housing-transition regien, is analy:cd fcr primary-plus-secondary stresses and peak stresses due to the normal and upset conditions.

Internal operating pressure, operating temperatures, operating basis carthquaxe (OBE) loads, dead weicht (D'd), pump-induced I

mechanical excitatien (Me.) load; and motor drivinc 1 pulse (DI) lov.: are considerci.

The resultin tress inten-cities and faticue usage factor are ovuluated according p

to the applicable criteria, A "1

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in Section II of this report.

1 II.

SIGIII~'ICAt:T RISULTS i

i The stress evaluation shows that all stress intedsities and usage factors rect the recuire=ents of Section III of the 1971 ASI'I Eo11er and Pressure vessel Code for the normal and upse: conditiens.

The table below su-marizes t! e results of the primary-plus-secondary stress analysis and evaluation.

T Sur. mary of Primary-?lus-Secer.dar'/ Stress Intensities 1

L Primary-Plus-Secondary Stress Intensity Stress (ksi)

Limits Max.

~

Stress ASMI Structurcl Int.

Code Re51on Range Loc.

Allouable Ref.

Cut 1 Motor Housing 37.48 99 9 Tube Inside Motor Housing Cut 11 Upper Ind 23 17 69.9 Insida F i *" *' 1 r'"- -

l MB-3222.2 i

cu* '12 cmcga Seal 49 54 l

69 9 i

Outside J

Upocr ?rcscurcL Cut 10 60.0 llouri nr-Tul e lj 45 91 Inr.ide a

'lbrenacu Element

'p'O ill3.*n.7

t.

.I 20* 1 s

1-Connection 1705 i

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711670-0

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.STRUCTURM.'.i:M.YCT.S OF CHCCK OATP. -

DY* -

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5 OCg*en FTION.

= - -

-= -

Tile CEfi4 !!cVOIriG The peak stress arialysis and; f atigue usage factor calcula-tion is summarized in the table below:

j Summary of Feak Stress Intensities and Fetigue Usage Factors 1

Total Stress (ksi) l Fati6ue Usage l

l 1

g Alt.

Usage Strtictural '

Stress Factor Allowable U

Region Int.

Loc.

j l

o Cut 7 l

.000 1.000 Motor HoustnE 25 42 Tube Inside Motor H0ustng Cut 9

.002 1.000 Upper End 32.11

.nside

.i.

Fitting Cut 12 omega Seal

'{ 28.85

.. col

1. coo Inside Cut lo

[

Upoer Pressure! 18.53 000 1.000 Hcusing outside g

e 4

J

~

t M

I M-' Al'I h,oMf3 USTION IINGIN!' EHING. INC.

Nu.m tu I

.,.go Nc CHttic OUf'AUTr.ictiT. Cit ATTAt':Coc A.TCt:N.

Sugg,y op

  1. M *i' 7

IO"O DA*T U

' D Y.

cu^noc No.

N

  • A N'

CHccK DATE

' ' H Y-pesen PTtoili-.

Ti!E CEDM llOUSING

)

I.. _ INTRODUCTION The pressure reta3ning compenents of the control c1cment drive mcchanism (CMDM) arc designed accordin6 to the rulcu of the 45N5 ccde. Under these rules primary stress intensity l

1s limited"for design, emergency, faulted and test condi-i tions, while primary-plus-secondaiy, stress intensities and peak stress intensities are limited only for normal and upset concitions.

Consequently, it is conveni'ent to l

separate the analysis and evaluation of the CECM housing into two distinct tasks: (1) a har.d' calculation of the primary stresses in the housing ar.d an evaluation of the

~

r.esult.ing stress intensitics; and (2) a finite element analysis cf the primary-plus-secor.dary stresses 'and peak i

str' esses due to normal and upset conditions and an evalua-i tion of the resulting ctress intensities,

. Further= ore, the geometry of the CEDM assembly makes it possible to divid.e the structure into

/

three regions, separated by long cylinder distances, and to independer.tly calculate the primary-plus-secondary (and peak) stre sses in,each region.

As.a result of these con-

'siderations, the analysis of the CEDM assembly is presente1 in four di stinct calculations.

Calculation RS-001, is a tentative sizing and primary stress analysis for the entire CEDM assembly.

Calculations RS-C02 and RS-OO3, are primary-plus-secondary stress analyses of two of these three independent regions:

(1) the ball seal housing and ball-seal-houcing-to-upper-precsure-housing transition, and (2) the upper-pressure housing-to-motor-housing' transition region.

C-E Calculation kS-004, the third indepen-In this report, dent regicn noted above, the mo tor-housing-lower-end-fitting-to-CECM-nozzle transition region, is analyzed for primary-plus-cccondary stresses and peak strocccc due to the norma] and upcot conditions.

Internal operatin.3 precouro, operatin6 temperaturco, operating ' aci c carthqued:e (0!W.) Icace, f ea.! ucir.h t ( D'3 ),

c pump-in.! aced mechanical u : citation (ME) :.cmte ami ir.ot.or drl.ving tmpulce (DI) loads are considered.

The resulting otrcsc intencitics and ratlGuc ucacc factors are evaluated E. _ _. _

according t.o the applical 1 p, criteria.

A#

~. 7 [.

.... ~...-

NU f.U H.f (

COMBUGTION L'NGINE Cl<!NG. INC.

2 OF_

Cf4GINt* C4HNG D(! PAG 1 MCidT. Cil A f Af 400c A. T C.4f f.

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DE SC f(,F1 to N Tile CEC..i !!OUGTilG The significant results of this investigatic s are suitdarized in Section II of this report.

R 4

II.

SIGNIFICANT RESULTS shows that all stres The. stress evaluation intensitien and usage factor meet -he requirements of Section III of the 1971 ASME actler and Pressure vessel for the normal and upset conditions-Code r

The table below summarizes the results of the primaryI lus-

[

~

p secondary stress analysis and evaluation.

Summary of Primary-Plus-Secondary Stress Intensities Primary-Plus-Stress Intensity'

. Secondary Stress (ksi)

Limits Max. 1

~

, ASME i

Stress Code Structural Int.

Region Range Loc.

Allowable Ref.

-1 I

Cut 1 91.2 Motor F.cusing 13 48 Inside Tube Motor Houninc Cut 4 69 9 MB-3222.2 Lower End 17;64 Outside

Fittlnr, cut 6 69 9 omeca Seal 31.97 Inside Threaded 14.52
  • "!*31 h

'27.7 He-3227..

i Connection i tio.

/

/.11 L-

a.--......-_,....._._....,

l'U ~ '#I Nut.tucle COf.* OUSTION GMCINECRING. INC.

40

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_ of: _

gg g ;7_

E NGiff C r nse:C OC('Alli f.1C NT. Cll ATT ANO O C A.lliNN.

- 11Y[

he.

" N' # "'

170-9 DATC Cl,IA nG U N O.

CHCCM DATE #I*

'DI C (f.

",. M.Y. T.9 OP O C S C lllPTIO N.'._

_ Tile CED:4 !!OUSII:G

..s..._

The peak stress analysis and. fatigue usage factor calcula-

'~

is sun:marized in the table' tion below:

Summary of Peak Stress Intencities and Fatigue Usage Fac+. ors Stress Intensity (ksi)

Fatigue Usage Alt.

Usa 5e Structural Stress Allowable Factor Location Int.

t

.000 1.000 Cut 1 7.85 Outside

.000 1.000 i

u t

"?

23 10 Insida I

cut a 17.86 000 1.000 Inside l

1.000

.000 cut 5 13 36 1

Inside

.000 1.000 Cut 6 17.02' I

Inside i

Y e

0 e

4 I

i h

t I

r h

L

=~ - -

APPEflDIX B i

Contents:

Page:

e 81 Sheet 8 of C-E Calculation RT-512. " Thermal Analysis of the Control Element Drive Mechanisms CECM and PLCEDM" e

I d

4 4

D e

k Y

P 4

7_

o

.. ~ _.

...... a...

...........-......._....~.T.....;.

,f

  • j

(.v,,in us a IWA L aw u Hv G L.8 (8

80...

A f* l'*

-OF

, cNGit4ECRsttG DCPAuT*AE NT. CHATTANOOC ' TCIIN.

ynng;T l~"%

7. /-7(

-ny 1M70.a DATC CllAHGE No.

CHCCK DATC UY.

  1. 7 8-V ogSCf:1rerO N..

8 f

j i

4.0 RESULTS z

The worst thermal transient was. Reactor Trip, Locs of Flow, Loss of Load.

The times evaluated in the structural analyses were tines with pressure pea} e l

as well as tir.es with the largest ther=al gradients, The ci6nificant radial gradients t:ere encountered at 2.0 sec. with axial gradients peaking at.200 sec.

1 The fc11owing table shows.the time steps used with l

.the iteration and trintout interva s.

4 Transient:

Reactor Trip: Loss of Flow, Loss of Lead i

Number of I! umber of

~

~

'Iine ( Se c. I Iterations l

Printcuts

.225 3

l' 375'-

3 1

5 3

1

.7 3

1 1.35 3

1

'15 3

1 2.0 1

1 20.0 12 12 e

25 0 1

1 i

30.0 1

1 i

4 4

50.0 100.0 2

2

. '300.0 4

4 l

t 1000.0 7

7 50 Micriton oF novfrIc'r The :aodel was analyr.cd using the ANSYS finite c]c=cnt Computer program.

i I

P e

4 r

l s

s h

s

.,>,,--a

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

r-,

..w m-.

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

. - -... -. -,.,. - -.

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