ML20126L296

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Analysis of A&M 24-Inch Purge Valve
ML20126L296
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 04/14/1980
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AFFILIATION NOT ASSIGNED
To:
Shared Package
ML20126L292 List:
References
JHA-79-138, NUDOCS 8106020290
Download: ML20126L296 (46)
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l . ANALYSIS OF A.& M 24" ,

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' PURGE VALVE

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BIG ROCK NPS -

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. J . --REPORT N0'.-JHA-79-138 m, . .

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'J - ATWOOD & MORRILL CO., INC.

285-Canal Street Salem, Massachusetts 01970

  • B April 14, 1980 Engineer $ / Structural Analysis 81 Applied Mechanics e 126 New Soston Park, Woburn, Massachusetts 01801 e (017) 933-3502 I

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I ANALYSIS OF A & M 24" PURGE VALVE BIG ROCK NPS

- REPORT NO. JHA-79-138 O .

PREPARED FOR:

ATWOOD MORRILLCO.,INC.

28 CANAL STREET SALEM, ASSACHUSETTs 01970 APRIL 14, 1980 f

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, TABLE OF CONTENTS

1.0 INTRODUCTION

2.0

SUMMARY

A'ND CONCLUSIONS 3.0 ANALYSIS 3.1 Seat Forces i 3.2 Disc 3.3 Arm .

3.4 Shaft 3.5 Air Cylinder O' APPENDIX A - TEST REPORT O

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1.O INTRODUCTION-John Henry Associates was requested by Atwood & Morrill to analyse the 24" Purge Valve (2841-E) for the purpose of determining the upper bound of disc impact velocity. Since the valve has to open at least once to break the containment vacuum, plastic deformation in any.of the parts should be held to acceptable levels.

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2.0

SUMMARY

AND CONCLUSIONS The onset of deterioration of the neoprene disc seat was evident i

in the static load deflection tests at .125" deflection. This i deflection was considered to be the basis of the limiting case for successful closure.

The resultant maximum velocity of the disc was 33.2 ft/sec.

At this velocity some plastic deformation was shown to exist in the disc at the edge of the center disc post. The plastic strain was .6% strain, confined to the outer (surface) fibers.

. Strains as high as 30% are considered adequate for a single (faulted) condition.

O The disc arm also showed slight yielding of .6% strain during impact. This was not considered sufficient to inhibit the subsequent operation of the valve.

( The shaft appears to be adequate for all loadings, during a slam at 33.2 ft/sec a plastic strain of 45% was experienced due to the torque placed in the end of the shaft by compression of the air in the air cylinder i

The limiting item in air cylinder is the lever arm. The air cylinder tube has to be lengthened by 3.5" inches to increase the amount of compressed volume. This reduces the air cylinder gs pressure to less than 304 psi.

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APPENDIX A w,,,.

+ ..

m i m.m ARNOLD GREENE TESTING LABORATORIES. I N C . .f

- ..u -

["N EAST NATICK INDUSTRI Al PARK. 6 HURON ORIVE

  • NATICK. MASS. 0t760 w, h. .? . /. [. .

\ ,

AREA CODE 617

  • PHONEl 235 7330
  • 653 5950 D 9 DRANCH LABORATORIES: .. ..... .,.. .,,,

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' '* MATintA'

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hNCESTRUCTivt TESTINQ: MAONAFLUX

  • 2VOLO
  • MILLION VOLT 4 LOW VOLT Aot X R AY
  • ULTR AsONIC FLAW OCTECTION
  • AUQlCACE THlCMNESS MEAGUREMENT
  • 80RESCOPE
  • G AMM A.M AY
  • FILM IN T E R P R ET ATION 4 CONSULTATION DESTRUCTlvt 7tsflNQ4 FAfiQUt TESTlHQ
  • METALLUROICAL INytsflG ATIONS ** W ET CNtMICAL AN ALY$la
  • ACIO ETCH SPECTROGR APHIC AN ALYSIS
  • PROCE DU R E 4 WELDER CU ALIFIC ATION
  • I M P ACT
  • STR $$8 RUPTUMt
  • ROCMWELL

$UPERFICI AL

  • 3RINELL
  • MICRONARONgse
  • PHOTOMIC ROG R APHY
  • ATOMIC A e SORPTION ANALYS16
  • AIR AND WAf tR POLLU TION ANALYG18

L .- ..-

r..

M P R ASSOCIATES. INC.

l May 2, 1980 l P-522 l

\

l Mr. G. C. Withrow Consumers Power Company  ;

1945,W. Parnall Road Jackson, Michigan 49201

Subject:

Big Rock Point Nuclear Plant - Closure Forces for' Containment Ventilation System Check Valve

References:

(1) A&M Report 201-13938-00, " Evaluation of Palisades Nuclear Plant Main Steam Isolation Valve", August 12, 1976 (2) TR-3223-1 Rev 2, " Palisades Nuclear Plant, Stress Calculations for Shaft for 30" MSIV",

Teledyne Materials Research, April 13, 1979 (3) JHA-79-131 Rev 2, " Shaft Analysis for Faulted Condition of 30" Main Steam Stop Valve", John Henry Associates, June 6, 1979

Dear Mr. Withrow:

.At your request, we have reviewed the stress analysis of the A&M 24" check valve used in the Big Rock Point contain-ment ventilation system described in the John Henry Associates Report No. JHA-79-138 dated April 14, 1980. i Our review of the subject report indicates that the report does not address a number of concerns which should be considered in an evaluation of structural adequacy of the check valve under slam conditions. For your convenience we have listed in Tabic 1 the parts and loadings which should be evaluated. Those items marked with an asterisk are not covered l

in the subject report.

It should be noted that A&M reports of analysis of the

' Palisades Plant main steam isolation valves which are similar to the Big Rock Point check valves cover the areas of concern not covered by the John Henry Associates report (See refer-ences 1, 2, and 3 above). We consider that these earlier reports can provide a useful check list to the areas which should be addressed in the analysis of the Big Rock Point containment ventilation check valves.

WAsNrNoroN. D. C. 20036 202-659 2320 1140 CONNECTICUT AvaNUE. N. W.

. . . . - - . . . _ , . ~ . . . , . , . , , . . . , _ . , . . . . . . - _ _ . . . . _ . . , . . _ _ . . , . . . , , _ , . . . _ . , _ _ . . _ , - . _ . _ , , _ . . . . . . _ . - , - - .

M PR ASSOCIATES, INC.

Mr. G. C. Withrow May 2, 1980 Another deficiency in the subject report is the lack of acceptance criteria which will assure operability of the valve after the slam occurs. The report appears to be primarily directed toward demonstrating structural integrity of the valve, parts under slam conditions. We recommend that'A&M be requested to specify the degree of permanent distortion of the various parts of the valve and operator which can be permitted without interfering with the ability to open and close the valve with the operator and for the valve to maintain leak ~ tight conditions.

In addition to the omissions noted in Table 1, and the concerns discussed above, specific comments on the analyses in the subject report are contained in Enclosure 1. We recommend that A&M be requested to revise the purge valve analyses to resolve the comments summarized in Enclosure 1 and the concerns discussed above.

In this regard, the. valve transient conditions needed

- to perform these analyses will be included in the final draft of MPR Report 644, which should be provided to A&M when it is available.

Please do not hesitate to contact us if there are any questions concerning this letter or Enclosure 1.

Sincerely, a

R. M. Weiner

, . . . . - _ _ - . . . - , ,, .,,..~..,.<m , , .,, .. _ . - . . . , - , _

, . - . . . , . . . . . . . . - , - . - , - -.----,.mv.,--

Enclosure 1 l

l l

Detailed Comments on John Henry

  • Report JHA-79-138
1. Page 10.- Disc strain due to impact on the seat '

The disc' strain calculation apparently assumes the disc is built in at the disc post. Actually, the post is threaded into the disc and seal welded. It appears the

" built-in" assumption is not realistic. Furthermore, the strain ic. calculated in the disc, but no evaluation is made of the weld which is at the point of highest strain. The plastic strain calculation is made by assuming that the elastic-plastic strain energy absorbed at the point of highest strain is the same as the strain energy calculated by the elastic analysis. This assump-tion is not valid since it does not account for the re-distribution of strain energy when a part of the disc is plastic. The' result is an unconservatively low strain.

The loading model used for calculating disc strain ignores the concentrated load from the disc post and disc arm.

2. Page 11 - Disc energy It is not clear that the cosine shape assumed for the disc distortion is valid. It is not consistent with the formula used for disc strain. The assumed deflection and the strain energy formula are. based on elastic analyses of the disc. Since the disc goes plastic, the j

energy calculation is not correct.

i l

3. Page 19 - Disc velocity The permitted disc velocity prior to impact is calculated from the energy absorbed by the seat and disc. This l calculation takes into consideration the translational I kinetic energy of the disc, but does not account for the rotational kinetic energy of the disc or any of the energy of the disc arm.

l 4. Page 24 - Disc arm strain The elastic strain is calculated. Plastic strain and distortion should be calculated. The deceleration of the end of the arm at the disc center could be used instead of assuming a rigid impact.

l l

I.

5. Page 26 - Shaft stresses The shaft torsional moment is incorrect. The moment used is the moment at the edge of the hub on the lever arm; the moment about the shaft centerline should be used. This-same comment applies to the shaft key analysis on page 37. '

The shaft stresses from the operator forces should l include the transverse shear and bending stresses. l The shaft strain is calculated elastica 11y; the plastic

. strain should be calculated. l I

The strain concentration at the shaft keys should be evaluated.

6. Pages 27 Operator stresses The operator analyses should include an evaluation of shear and tension stresses at all the connections. In addition, the additional compression of the air due to overshoot of the operator parts when the disc slams closed should be included in the analysis.
7. Page 33 - Operator pin shear The value used for the force on the pin is one-half the correct value.

I 4

- 2-

.,,- ,--.,.re-, - . , - - - , n . .e ,.-,,,,-+.n,

,s-r , .-, ,- - , , , , .

&' TABLE 1 Valve Parts and Loading Conditions Prior to impact:

Parts Loading Disc post

  • and arm
  • centrifugal force *, angular acceleration *, pressure on disc
  • Operator acceleration of' operator parts *, cylinder pressure, spring-force Shaft
  • combined forces from disc arm
  • and operator Efter Impact:

Parts Loading Disc deceleration of disc and arm *, pressure on disc

  • Arm deceleration of arm Operator deceleration of operator parts *, cylinder pressure, I

spring force Shaft and keys combined

  • forces from disc arm and operator *
  • Parts and loadings not included in the A&M report.

n+,- . - - - , - - , , , - - - , ,-,-,,-,,.-.r-,-,. , - - , - , - -v,v . ,- , - . - - - ~,a -,- ---,m,..- , -, . , - , - . - - - -

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