ML18347A518

Submit Formal Report, Evaluation of Palisades Nuclear Plant Main Steam Isolation Valve, to Additional Information Provided on 7/20/1976

ML18347A518
Person / Time
Site:	Palisades
Issue date:	11/09/1976
From:	Bixel D Consumers Power Co
To:	Schwencer A Office of Nuclear Reactor Regulation
References
Download: ML18347A518 (36)

Text

consumers

• Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 November 9, 1976 Director of Nuclear Reactor Regulation Att: Mr Albert Schwencer, Chief Operating Reactor Branch No 1 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLA.N"T - MAIN STEJ.JI!

ISOLATION VALVES

• By letter dated July 20, 1976 w-e provided add.itional informa-'cion regarcnng the design of the Palisades main steam isolation valves. An attachment to that submittal discussed a formal report being prepared by Atwood & Morrill Co.

Discussion with members of you.r staff indicated their desire to review this

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report when it was completed. This report has now been completed and is submitted as an enclosure to this letter/:;-,,.,,,

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Assistant Nuclear Licensing Administrator CC: JGKeppler, US1ffiC DOCKETED USN Re

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l REVISION SHEET Rev.

Date Revision No.

1 Oct. 4, 1976 Added the evaluation portion of the Disc Arm, Disc Post, and Shafto .

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TABLE OF CONTENTS Page

1.0 INTRODUCTION

1 2.0

SUMMARY

O*F RESULTS 1 3.0 FLUID DYNAMICS ANALYSIS 3 4o0 STRUCTURAL EVALUATION 3 5

5.0 DISCUSSION AND CONCLUSION

' 6 0 0 REFERENCES 7 APPENDIX A. ANGULAR VELOCITY 8 B. EQUIVALENT TRANSLATIONAL VELOCITY 9

c. KINETIC ENERGY . 10

' D.. ENERGY DENSITY 10 E. ESTIMATED EQUIVALENT STRAIN- 11 FIGURE 1 - MAXIMUM STRAIN ACCUMULATION 13 AND STRAIN ENERGY ACCUMULATION F. MASS MOMENT OF INERTIA 14 G. DISC ARM EVALUATION 23 H~ DISC POST & SHAFT EVALUATION 31

1

1.0 INTRODUCTION

At the request of Consumers Power Company, Atwood and Morrill Company (A.&M) h.as .performed a st.ructural analysis and a strain energy analysis to determine the adequacy of a main strain iso-lation valve .for the Palisades Nuclear Plant. The analysis was performed to qualify the disc of these swing-disc type valves for impact resulting from a pipe rupture. The analysis for this faulted condition consists of two parts (1) a fluid dynamic analysis,* done by MPR Associates, Inc. ~]

• from which an impact velocity of the slamming disc is determined and (2) a structural evaluatio*n which involves determining the maximum equivalent strain and compares it to established criteria[!}. Meeting these crite~ia, which have been accepted by the U.S. Nuclear Regulatory Commission, ensures that fracture will not occur.

The valves analyzed herein are already installed and operating, but their discs are to* be modified so that they will be similar to .dis.cs l,t~.ed i.n .MSIV'.s at tl.1.e F.?-r:Ley Nuclg~r .Station. These

.discs were qualified by Teledyne Matetia*ls **Research (TMR} in a previous report(?]. This disc is a fiat disc, as the Palisades discs are now, but it is constructed of 304 stainless steel rather than carbon steel. Also, the rim is thicker, there is a radius on the back side which avoids high strain concentration at this point, and the hole at the center has been eliminated by redesigning the arm which is now much* stronger. This new arm allows deformation of the disc but resists centrifugal and inertial loads during valve closure.

• TMR analyzed the Farley disc with the aid of PISCES [3], an elastic-plastic finite difference computer code capable of solving impact problems. Equivalent strains were determined with this code. TMR also reported a method[4]to determine the equivalent strains in other flat discs from the results of the Farley analysis. This report, entitled "Further Interpretation of Farley Isolation Valve Closure Analysis", gives *a graphical procedure for finding equiv-alent strains *by comparing the *total kinetic energy of the Farley disc to that of the disc under investigation. Hence, a new computer analysis of a similar valve may be avoided. The redesigned Palisades

• valves are similar but somewhat smaller.

2.0

SUMMARY

OF RESULTS

1. The design closing transient conditions were calculated by MPR Associates, Inc. That calculation used a computer model of the fluid dynamic and valve mechanics to obtain the tran-sient pressures, flow, accelerations, and velocities result-ing from the postulated main steam line break. The predicted closing velocity of the disc centerline at the time of impact of the seat will be taken as 120 feet per second. This value

.is used :in *the structural 'evaluation o.f .the di.sc ,and $eat upon impact.

• Numbers in brackets correspond to references, Section 6.

2

2. .Structural *Analysis gives the following results; A. Equivalent translational velocity of the disc VEQ = 145.5 ft/sec B. Kinet,ic energy at impact K~ = 179,183 £t-lb Co Energy density e =. 93o0 ft-lb/in3 Do Estimated equivalent strain

1. e ~(Rim} = 16~8%

• 2. £-= (Center Section) = 10. 2 %

'.For item 2A, the equivalent translation velocity of the disc is higher than the actual centerl;ine velocity because the kinetic energy of the massive arm has been lumped with the disc, Thi~

technique is used because it is conservatively assumed that all of the kinetic energy is dissipated by strain energy absorption of the disc alone. This is a reasonable assumption since the arm.is so rigid.

To perform a structural evaluation, the energy of the Farley system must ..be compared .to Palisades. The Farley energy is KE= 225,700 ft.,..lb The discs must.absorb the kinetic energy by converting it* to strain energyo Since they have slightly different volumes; .the kinetic.

energies.will.be normalized by the disc volume to give the energy density. The energy densities are l~ For Farley e = 98.82 ft-lb/in3 2o For Palisades 3

~ = 93.0 ft-lb/in The -energy density of Palisade$ is 94% of the energy density of Farley. Therefore, an evaluation of the Palisades can be performed by the methods of Reference ~] The equivalent strains are

• 1. "For 'the r+/-m *region

'. e: = 16. 8% < 30%

3

2. £ = 10t2% 418% ~

The allowable equivalent strains for the rim and the center section are 30'% and 18%/ respectively, Therefore, the disc will retain its integrity for faulted condition.

The Disc Arm, Disc Post, and Shaft integrity is shown in the Appendix to ensure proper Disc seating.

FLUID DYNAMIC ANALYSIS The function of the main steam isolation valve. in the event of a postulated steam line break is to close promptly and prevent the blowdown of its associated steam generator. At the time of this event the valve would undergo a servere transient due to impact of the valve disc onto the valve seat~

MPR Associates, Inc.*determined the design transient condi.tions in ref [5JThe report presents the analysis to determine the angular velocity attained by the disc at impact as a result of the postulated accident, The method of analysis used a control volume approach to solve the mass, energy, and momentum equations throughout the appropriate region of the main steam piping. The valve internals are modeled to allow a good representation of the torque on the disc using the solution from the mass, energy, and momentum conservation equations~

Effects on the geometry as a result of disc position changes are considered in the analysis. .

• The**valve will be shown in the structural evaluation to withstand a predicted disc centerline velocity at the time of impact on the seat of 120 feet per second.

4.0 STRUCTURAL EVALUATION Structural analy~is and eval:µation for the P;:;i.lisa~es MSIV discs are shown in the Appendix_ and summarized here.~

For the faulted condition, discs in MSIV's close at extremely high velocities and kinetic energy. Large plastic deformation will occur; hence, stress comparisons do not yield meaningful results.

On the* other hand, strain can be evaluated to determine if fracture will .occur anywhere in the disc.

• A relationship between the stress-strain diagram and the initial kinetic energy enables the analyst to determine the maximum value of strain. Simply stated, the total kinetic energy at the instant of impact equals the total strain energy of the disc when it comes to a rest. And since strain energy is the area under the stress-strain diagram, the strain is found by monitoring the kinetic and

• stra;i..n energies. '.I'l1e JSt+.ei:;s ?tn.d .stl'.'.'ain C!.ue t;o the app;I.ied differ-ential pressure across the disc a:re*n:egligible.

• ' 4 The PISCES program was used to obtain accumulated strain components and equivalent strain in the Farley discv The final equivalent strain was then used to determine if fracture would occur by apply~

ing the accepted criteria[lJ. It was found that the Farley disc was well within the limits of the c;:riteria.

Palisades have valve internals which are similar to the Farley MSIV~

A comparison of the disc geometric parameters is given in Table 1.

Because o*f the similarities, it is possible to find the total equiv=

alent strain in Palisades from the Farley valve by comparing the kinetic energies. This procedure is presented in Reference[4]where it is stated that the total energy in a valve to be evaluated should be less than or equal to the maximum kinetic energy of the Farley valve.

A comparison of the impact parameters is given in Table 2. The disc centerline velocities are the actual velocities at impact a*s found from the fluid dynamics analysis. The Farley valve closes with a greater impact velocity than the Pal*isades.

It is assumed that all of.the kinetic energy is absorbed by.plastic straining of the disc. This assumption was made for Farley as ,well as the present work. This results in the "equivalent translational translational velocity", viz!',

(. MDVEQ 2

2

=.KE where KE is the maximum kinetic energy of the rotating system as found by the fluid dynamics analysis, Mo is the mass of the disc, and VEO is the equivalent velocity to be determirt.ad. For this analys.t:s the kinetic energy of the Farley valve was computed from tbe above e<;{l;lation using the equivalent velocity from Referenc~ 2p The Palisades valves are.slightly smaller than the Farley MSIV.

The discs f.or Palisades have somewhat less volume, about 16%. This means that the strain energy is more concentrated in the Palisades MSIV discs; there is less material to absorb the kinetic energy.

Therefore, the* kinetic energies were normalized *with respect to disc volume for the comparison to give the energy densities.

As seen in Table 2, the energy density of Palisades is 94% of that of Farley. Figure 1 of the report now enables us to find the equiv-alent strain for Palisades from the Farley results. The ~quivalent strains, in the rim re.gion and in the center region, are plotted as a function of accumulated strain energy for the Farley valve. Hence, the equivalent strains for other.valves are found from the plot by 0

~

5 locating the impact energy on 'the abscissa and finding the correspond-ing equivalent strains. Because of the difference in disc volumes; A&M compared energy densities rather than energy. For the rim region,.

the equivalent strain from figure 1 is e = 16.8%

For the center section, the equivalent strain is e= 10.2%

The allowable equivalent strains from the criteria of Reference.{lJ are 30% and_l8% for the rim and center sections, respectively.

Therefore, the discs will not fail by fracture because of the circumferential pipe break.

The Palisades disc arm integrity is shown in the Appendix by comparison with Farley (Ref. 6J. It is shown that the disc arm will not distort and prevent proper seating.

The ..disc ,and ,disc . arm \are,desi.gned . in . the ..same manner .as Farley which allows the disc post to move independent of the disc arm at impact.

The shaft is the same material and size as Farley and is shown to maintain its structural integrityo 5.0 DISCUSSION AND CONCLUSION By comparing the strain energy densities of the Palisades MSIV's, we have found that the disc will not fracture as a result of the circumferential pipe break. Since the Farley valve* qualified for the faulted condition, the Palisades valves would qualify simply because their energy density is lower. The body also will qualify for Palisades by virtue of the fact that the impact energy is less than that of Farley. The maximum effective strain in the*Farley valve body is 15%. Because it is accompanied by a compressive hydrostatic stress state, an effective strain of up to 29% is accept-able for the carbon steel body.

• CONCLUSION It has been found that the Palisades MSIV's will retain their structural integrity during and after a circumferential break in the main steam line.

0

6

• • TABLE 1 Comparison of Geometric Properties Farley Palisades Disc radius, r 13075 in 12~625 Disc thickness, t 30846 in 30846 r/t ratio 30575 in 30283 Disc volume, V 2284 in 3 1926 Disc weight, W 646 lb 545 m

System moment of inertia 255,200 lb-in2 192,600 about shaft centerline, I Pressure area, A 594 in 2 501 TABLE 2 Comparison of Impact Parameters Farley Palisades Centerline velocity at 139 ft/sec 12000 impact, VcL Rotational velocity, w 10403 rdn/sec 92:..89 Equivalent translational 150 ft/sec 145.51 velocity, VEQ Kinetic ener~y, 225,700 ft-lb 1791183 KE = W VEQ2/ g Energy density, 98082 ft-lb/in 3 93o0 e = KE/V

7

6.0 REFERENCES

1. T. Slot, o. Batum_, and R. A. Genier, "Dynamic Analysis of Steam Isolation Valve for Closure Under Faulted Conditions",

Proceedings of Third International Conference on Structural Mechanics in Reactor Technology, London, .September, 1975.

2. Joseph M. Farley Nuclear Plant Final Safety Analysis Report Appendix lOA Amendment No. 45 dated 2/21/75.

3. PISCES~2DL, Version 3, Manuals A, B and C, Physics International Company, 2700 Merced, San Leandro, Calif. (1974).

4. Teledyne Materials Research Technical Report TR-2196, "Further Interpretation of F~rley Isolation Valve Closure Analysis",

November 5, 1975. * *

5. MP,R As.s_ociates., Inc. R~port MPR 500, . "Ana°iysis of Disc Impact Velocity fo::r Palisades *Main Steam Isolation Valve as a Re*sult of a Main Steam Line Rupture", November 1975.

6, Teledyne Materials Research Technical Report TR-2000, "Disk

~rm ~nalysis of Main Steam Swing Trip Valve, *Farley Nuclear Powe:r Station 11 , February 2 O, 19 7 5.

• APPENDIX Ao Angular Velocity Be Equivalent Translation Velocity CQ Kinetic Energy D. Energy Density E. Estimated Equivalent Strain Fe Mass Moment* of Inertia Go Disc ~rm Evaluation H. Disc Post & Shaft Evaluation

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