ML18047A448

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Comparison of Garrett Production Nuclear Valves W/Valve Used in Epri/Pwr Safety & Relief Valve Test Program
ML18047A448
Person / Time
Site: Palisades Entergy icon.png
Issue date: 10/22/1981
From: Bigus J, Fleming W, Mccollum M
GARRETT CORP.
To:
Shared Package
ML18047A442 List:
References
41-3088B, NUDOCS 8207160343
Download: ML18047A448 (30)
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ENGINEERING REPORT COMPARISON OF GARRETT PRODUCTION NUCLEAR VALVES WITH THE VALVE OSED IN THE EPRI/PWR SAFETY AND RELIEF VALVE TEST PROGRAM 41-3088B October 22, 1981 Prepared by:

M. A. McCollum Approved by:.....

~~-*-'-~.._~;;.....~.;..;::;;:;.....;;..,"'---~--~

W. T. Fleming/Supervi r

Engineering Publicati ns M.A. McCollum/Ass't. Proj. Engr.

J. L *.'Bigus/PJoject Engineer GARRETT PNEUMATIC SYSTEMS DIVISION A DIVISION OF Tl-IE GARRETT CORPORATION 111S0.34T1-tST.PO BOX5217 PHOENIX. ARIZONA 85010 TEI.. (602) 267*3011

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~one MAM/JLB 7-8-81 MAM/JLa s~1o~a1 rt"'

'.Origir.al Issue

aevised ?a:agraphs l.2, 2.2.2,

'.2.3.2, 2.4.l, 4.3, a~c 4.4.

Also

revised Table ! and ~ig~res 2 and
  • 3' Re~ised ;a:!qfaphs l.1~ J, ~.:,

4.L.3, 4.1.4, 4.2, 5, !~;u:9s 2

?nd 5~ alsc '~~~~ A;;!~~ix :.

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1~1 GARRETT PNEUMATIC SYSTEMS DIVISION A OIVISION OF THE GARRETT CORPORATION PHOENIX, A"IZONA

1.

2o

3.
4.
s.

TABLE OF CONTENTS INTRODUCTION AND

SUMMARY

1.1 INTRODUCTION

1.2

SUMMARY

DESCRIPTION OF GARRETT PRODUCTION NUCLEAR VALVE DESIGNS*

2.1 TYPICAL FUNCTIONAL SCHEMATIC 2.2 COMBUSTION ENGINEERING SOLENOID-OPERATED RELIEF VALVE 2.3 WESTINGHOUSE POWER-OPERATED RELIEF VALVE 2.4 DIRECT-ACTING, THREE-WAY SOLENOID DESCRIPTION OF EPRI/PWR TEST VALVE, PART 3224718-2 COMPARISON OF EPRI/PWR TEST VALVE WITH PRODUCTION CONFIGURATIONS 4.1 MAIN VALVE ASSEMBLY 4.2 GENERAL SIMILARITIES 4.3 STRAIGHT-THROUGH VERSUS RIGHT-ANGLE FLOW HOUSING 4.4 SOLENOID CONCLUSIONS TABLE I

LIST OF TABULATIONS DESCRIPTION LIST OF DOMESTIC PRESSURIZED WATER REACTORS USING GARRETT RELIEF VALVES 41-3088B Page i PAGE 1

1 1

2 2

6 9

12 14 14 18 19 20 20 21 PAGE 3

'IGURE l

2 3

4 s

6 7

t.IS'l' O:'

!LLtJS':'~;'1'!C~iS FUNCTIONAL SCBEMAT!C DIAGRAM OF GAR..~~'l'T POWER-OP~.RAT~ RELIEF VALVES COMPONENTS OF 3 :-< 8 RIGHT-Ai.~GLE SO!.ENOIO-OPERAT!D RELI::::E' VALVE, GARRETT PART 3750010 COM~ON~t~S OF 3 X 6 STRAIGHT-THROUGH POt;li~-OPER..;T!D.RELI~ VALVE, GARRSTT PART 3750014 COMPONENTS OF THR~-WAY SOU:NOIO VALVES, GA.RR~'l"l' PARTS 3750020 ANO 3750028.

EPRI/PWR TEST v;\\iVE, GAR.f{ETT PART 3224718~2 CROSS-SECTION OF !~RI/PWR TEST VALVE CROSS-SECTION OF GARRETT DEVELOPMENT SOLENOID LIST OF APP~NCIC~S

~~~!NC!X l GARR-~T ST~IGHT-THROUGH T~S'!' VALVE PEUOR.'!ANCE AT l<!A.~SHALt ST!AM S'!'AT!m:,

JAi."ro'ARY 23, 1981

?=.;~..

i 10 13 13 16 17

!NSER'!'ED AT BAC!(

OF REPOR'!'

L Ll GARRETT PNEUMATIC SYSTEMS OIVISION A OIVISION OF THE GARRETT CORPORATION PHOENIX. ARIZONA ENGINEERING REPORT COMPARISON OF GARRETT PRODUCTION NUCLEAR VALVES WITH THE VALVE USED IN THE EPRI/PWR SAFETY AND RELIEF VALVE TEST PROGRAM INTRODUCTION AND

SUMMARY

Introduction This report, prepared by Garrett Pneumatic Systems Division of The Garrett Corporation, is intended for use by the Electric Power Research Institute (EPRI) in support of the EPRI/PWR Safety and Relief Valve Test Program.

Included are descriptions of Garrett's power-operated relief valves presently in production, and a comparison of these designs with the Garrett PORV presently being utilized in the EPRI/PWR (pressurized water reactor) test program.

As background information, it is noted that Garrett Pneumatic Systems Division was created in January, 1981,

  • in a corporate re-organization of AiResearch Manufacturing Company of
Arizona, a

Division cf The Garrett Corporation.

The Pneumatic Systems Product Line (of which the Nuclear/Industrial Valve Project is a part) was given full divisional status at that time.

1.2 Summary Garrett Pneumatic Systems Division (GPSD) is currently under contract to both Combustion Engineering and Westinghouse to provide power-operated relief valves for installation in the steam supply systems of nuclear power plants *.. The valves are mounted on top of the reactor coolant system pressurizer in pressurized water reactors.

At the present

time, Combustion Engineering of
Windsor, Connecticut, has ordered* two solenoid-operated relief valves (SORV) for the St. Lucie No. 2 reactor being built for the Florida Power and Light Company.

The CE valves (Garrett Part 3750010) are right-angle designs equipped with flanged pipe connections with a 3-inch nominal diameter inlet and an 8-inch nominal diameter outlet.

The valves are capable of venting saturated steam, a two-phase mixture of water and steam, saturated water, or subcooled water.

Westinghouse Electric Corporation of Pittsburgh, Pennsylvania, has ordered thirty power-operated relief valves (PORV)

(Garrett Part 3750014) for various Westinghouse nuclear installations around the world.

The Westinghouse valves are straight-through, welded-connection designs equipped with 3-inch inlet and 6-inch outlet ports.

These valves are also capable of venting saturated steam, a two-phase mixture of water and steam, saturated water, or subcooled water.

41-30888 Page 1

G.a.RRe,.... "'Ne'.JMA'T':C SYS'T'EMS 01'/ISION

~ ::*11S1CNC* **ie ~--**e,...::a~*.a.:":,:H a111oe11t**..... ~~&

aoth th9 c~ and ~estic;house 7a!ves contain a high ?e=~entage =!

common ?arts. 3oth uni:s a:e a:sc very si:ni!ar to !:~e val*10: '.lsed i:-:. t::e

!PRI/?.iR test

?::'~g:am.

'!'he ter:ns nsolenoid-ope:ated" and rvpower~

09eratedn correspond to t!::e

'!Omenclat*.ire used

~y t::e

especti*1e customers, Combustion

~nc; i:'lee: inq and :'1est inc; house.

The 11a:.*1es are identical in basic func~ion and operation and differ ?rima:ily in the configuration cf t~e flow housinc;s as subsequently disc~ssed he:ein.

Table I presents a list Of the utilities and power ?lants which use ':he Garrett ='ORVs and SORVs.

The following sections of this

eport ?resent detailed descriptions of these val7es, t:c;ether ~ith a discussion of the si.milaritv of these units to t:he EE'RI test 11alves tested at t!::e Mars~a!l St:!am* Station a::d Wyle :.a.boratories.

The first Garrett test l?ORV was identified as Part 3224713-1.

Th is valve incor~orated a single-piece cac;e and seat assembly which were held in ~osition by a Flexitallic gasket used as a com~ression speing.

~t the time of the Marshall test, Garrett intended this design to be utilized in the production SORVs and PORVs to be delivered to Combustion Engineering and Westin9house.

Al though tbe Marshall Test* of the Ga::ett PORV was successful, the test val'le developed a small leak (0. Ol gallon per minute) under t~e valve seat.

Upon. reviewing this test result, Garrett concluded that an i~proved desic;n was pcssib:e and changed bot~ the test and ?~oduction

~al7e designs

~o incorporate these desi;~ i~pcovements.

Test valve 3224il8-l was returned to Garrett and

~odified to

~he 3224ilS=2 confi~ura~ion whi~h incorporatsc all the design f9at~res of the iutpr:oved Combustion ::ngineering anc Westinc;house va1~1e desi*;ns.

A mo'e cetailed disc~ssion of t~e design features used in ehe Marshall

'!'est ~lalve, ~art 3224718-l, is given i!'l Appendix A.

The Ga::ett test PCRV,

~art 3224719-2, Nas subseq~ently :ested at Wyle !.aborator!.es.

2. l Tv:iical :'unctional Sche:natic.

Pi;ure l shews the fanctional schematic tv~ical for all c~r:ent Ga:ret~ ?owe:-operate~ ~elie: valves.

The rncce of opera:ion of :~ese 7~lves is desc:i~ed i~ :~e foll~w!.~; pa:a;:a;~s.

~:-1~:*3:;

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Pl I--'

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-~ GARRETT PNEUMATIC SYSTEMS DIVISION

'1...ua.~ A UIVISIUH llf 1 tit: GAHH~ 11 COftPOHA TION

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PttOlHUC. AAllONA Utility Florida Power and Light Georgia Power Company Kansas Gas and Electric Northeast Utilities Union Electric Company TABLE I LIST OF DOMESTIC PRESSURIZED WATER REACTORS USING GARRETT RELIEF VALVES Valve Port Valve Plant Size Configuration inches St. Lucie No. 2 3 x 8 Right angle Arvin w. Vogt le No. 1 3 x 6 Straight-through Arvin w. Vogt le No. 2 3 x 6 Straight-through Wolf Creek No. 1 3 x 6 Straight-through Millstone No. 3 3 x 6 Straight-through Callaway No. 1 3 x 6 Straight-through Callaway No. 2 3 x 6 Straight-through

(**.. ;,

Garrett Part Number 3750010 3750014 3750014 3750014 3750'014 3750014 3750014

I-*~ i a..i.RRer. ~Ne 1.JMA'T':c SYST5Ms 01vrs10N 4.AallllTl"'f

.1. :*, 15, :-..:s --a :i*aae;- !:ai~,11" -:*:,..

I**~ I ~-c:'*" ~.a,.:::.-...

SOt.ENOIO SPRING VcNT SEAT SUPPLY SaAT ACil.JAiOA H&AC CHAM SER

.ACTIJATOA SPRJNG IN T.!f

'-r-..... **:":"

.. -'...:1\\wb.. _

GARRETT PNEUMATIC SYSTEMS OIVISION

"' OIVISION OF T"E GARRETT COAPOAATJON "2M0ENIX, ARIZONA The Garrett power-operated relief valve is a line pressure actuated, solenoid-controlled, relief valve of the caged-plug type.

The schematic diagram of Figure l shows the unit with the solenoid de-energized and the valve* closed.

Inlet pressure (either vapor or water) flows into the valve inlet connection and is ported through the solenoid seat to the actuator head chamber of the valve.

Inlet pres-sure is also ported underneath the piston and through the cage* holes to surround the plug.

The forces tending to hold the valve closed include the pressure in the actuator head chamber acting on the entire piston area and the actuator spring load. Inlet pressure also acts on the annular area beneath the piston {and outside the seat diameter) in a direction to open the valve. Since the annular area is less than the total piston area, the closing force predominates and the plug is held down against the seat with a force equal to the value of inlet pressure multiplied by the seat area.

When the solenoid is energized, the magnetic force acts on the solenoid armature to move the ball from the vent seat (as shown) to the opposite seat, thus sealing off inlet pressure from the actuator head chamber.

At the same time, the actuator head pressure is vented to discharge through the vent seat of the solenoid.

With the actuator head chamber now at discharge pressure, inlet pressure acting on the annular area is sufficient to overcome the actuator spring load.

The plug moves away from the seat in the direction to open the valve.

As the valve opens, pressure inside the cage builds up underneath that portion of the plug exposed to discharge pressure.

Because of the pressure drop through the cage flow holes, this pressure is less than inlet pressure but higher than the discharge pressure.

The large seating force that exists when the valve is closed is thus turned into an opening force, causing the plug to move to the full-lift position.

When the solenoid. is de-energized, the ball moves back to the seat as shown, sealing off the path to discharge and repressurizing the actuator head chamber with inlet pressure.

With the plug in the full-lift position, the opening force consists of inlet pressure acting on the annular area and cage pressure acting on the.base of the plug.

The closing forces (consisting of inlet pressure in the actuator head chamber and the actuator spring load) overcome the opening forces and ~ause the plug to move toward the seat.

Discharge pressure drops to a minimum as the valve reseats, and the valve is once more held in.the closed position by a force that is equal to inlet pressure multiplied by the seat area.

41-3088B Page 5

2.2.l

~aior Com~onents - The

~aior ccm~onents

~hie~

cornp~ise the Ga:ret::t 3-i:1c:t :< 3-incn right angle sole.r.oid-c?e:ated ?:'!lief *1al:Te (SOP.~!)

(Garret': !'art 3750010) are ill~strated in E'iqure 2 a~d ::e describ~d in t~e !ollowinq tabulation.

Fi::d Component Number Oesc::ietion Material 3

Solenoid Gar:ett ces:.;nec 4

Sedy C~ES SAlS 2, GR F316 s

Bonnet CRES SAlS2, GR F316 6

Ca9e CRES -SA4i9, TY!'e 21800 7

Pluq OES SA4i9, Type 316 (RCocr~A hardf acinq) 9,9,10 Studs SA540, GRB2l, CL2 (Electrole$s-nickel plated) 17,18,19 Seals 347 and G:aphoil 20 Seat SA479, Type 316t,

(~CoCr-~ hardf acing}

2.2.2 Desian Features and O~eration - As shown in

~igure 2, the Ga:rett tiqht~anc:;le SORV utilizes a n~art:id~e** closui='!

elememt approacb 1o1hich isolates the inter:'lal operatir:g mecl':an.ism ::om t:!'le oute: ?t"essur~ vessel componentsa T~e val~e body, bonnet, and sole-noid, and t~eir respective studs and nuts, retain system ?:essu:e as i:-equi:ed by the AS:1:c: 9oiler and ?ressui:e Vessel Cece, S.:c':!.on r::::,

Class !. ':'!'le ~ody also t:ansmi t:s anc reacts ex':ernal loac s a?sili ec =o the val*:e.

Valve operation and closure are per:crmed by t~e cage, plug, and seat asse!!tbly, whic!'? a:'e :ned::.anically isolated ::-orn t~ia

n
ess;.::e~
~e.a:.:i.i:!'; ;:a::s.

T~e ftal~1e seat is seale.:

wi:~

  • 1 s::~~e

~..::al./

G:a?hoil-ty;e Sel:o seal and is bol':ed !.n:o

=~e ~ody ~i:~ ~e~ ~!.;~

stre~;~~ ~236 C~!S ~ol:s.

~~~ sea:, t~us a~c~oced, ~eco~es :~e ;~!.~e

~or :~e ca;e !~d pl~; ~sse=tl7. Once i~stal!e~, ~~e ca;~ :!~~~=es :~e

ea:
o~:Sa

':'~~ :.:*;e r= !.s

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.::.e~

~:: a.

s~C :i~g *~!"! ::-.: :::.: =.:-.::

s:a:~c '=:r :te:::.:

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~ea: :.:'! -:::::

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7~e ~:~; :o !s 3ea:~d ~? ~ea~s ~~ a :s:~o~ ?~

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,...,,.. "': ---- -=--- -** -**- ---:- --- -- ---*** - _ _,.,,,, ___ **--****- -*--

7~is ::~sed ~=:~~e is =~~ ac:~a:~c ~ea~ ~~a~~ec s~=~~ *~ !i;~=~ _ !~=

~is~~ssed *~ ?a=!;:?;~ :.: a~=~ia.

GARRETT PNEUMATIC SYSTEMS OIVISION

.. DIVISION OFTHEGAAAETTCOAPORATION PHOENIX. AAIZONA COMPONENTS OF 3 X 8 RIGHT-ANGLE SOLENOID-OPERATED RELIEF VALVE GARRETT PART 3750010 FIGURE 2 41-30885 Page 7

The caged ;lug desi;n :ias a number of inherent advantages ove: an uncaged

1.*Jg-1
7~e 11al7e.

When

':~e :?lug is actuated to t~e o-;en

~csition, t~e ;>lug sealinq surface is retracted out of the :low stream, thus reduci:!g or eliminating t!le possi!: ili ty of erosion o*:f t~e sealing surface oy either high-9ressure steam or contaminant.; in the !low stream.

!n addition, the annular arangement of the cage !low holes focuses t~e flow stream in the center of the cage, thus reducing flow velocities over the v-alve seat and the:-eby al.so reducing t:ie ?ossi-bility of erosion.

In addition, the cage/seat assembly acts as a dual or~tice system with a two-stage ?t:'essure drop o The reason for the diffe:ences in cage and seat flow areas in the various valves is ll the need to vent the specified quantity of steam and/or water through t~e valv-e, and 2) to eliminate the possibility of sat;urated water flashing to steam upstream of the seate Compensation for ther:tlal growth c:aused by differential heating rates between the valve ca9e and body is provided !:y a qap which is maintained between the bottom of the cage and the top of the seat o When the ~alve is closed, the cage is held up against the bonnet by a light sprin9 (?ind Number 27).

When the valve opens, pressure forces the cage up in:o the bonnet with a high load, thus maintaining the gap oe twee!'\\

t~e !::lase of t:ie cage and the seat: o E:ven under worst-case the~:nal growth conditions, the seat-cage-bonnet stacl<: is never such

.hat the t!!ermal compensa :or gap is reduced to zero o Thus, the

'"floatinglO cage fems.ins axially unloaded at all times, and thermal

rowth has no effect on operability of the ~alve.

CemQensation for end load-induced defor~ation of the valve ::odv is :orovided in :nuc:h the same :na.nne:.

The diametral clearance between theD cage and ~ody in the area of the piston :ing ls an order of magni-tude larqer than the worst possi~le defor~ation of the body in this region.

Even when maximum end loads are applied to t~e ~ase of t~e valve, the ~odt riever contae~s the cage CD and no fot:'ces are t:a:'ts-mi tted oetween the two compone~ts.

T~e Gar:ett SORV i~cor~oratas :edur.da:it :osition switc~es.

Two of the swit:e!'les a:e ac~uated when the !!alve is inD the closed position and t:wc are actuat'!d wnen the V'al~.re is i~ t~e open ;iosi: ion.

Ou: !.:ig *t:ie

':.i~e =~ac t~e ~a:ve ls s~:ok!.~; ~e=wee~ t~e :pen and ~:~se~ ;csi~icns, all

~u:'

S?-.*i~*=!';es

a.:.~:.ai~.:o:'l-:i:-!.t.:!.:70

':~e S'ni~:hes a:-: ac-:!.!a:ed ::_.-

0

~==~s of :

sart.a:~:..::t/ccba:~ :n:.gnet *"'*hi*:!'! :ttO"res

~? ::-:::

=~,Ai~ *.*l:::,,

~e*
l~g i
is!~e ~~e ~on~et.

T~us, ~osi:!~n i~~!ca~!on !s =~:3!~s~ ~i~~c~:

~~~
:a~L~~ ~! ':~e ;:ess~:e ~c~~~a:y==

~he ~se cf ;ac~!~;s.

GARRETT PNEUMATIC SYSTEMS DIVISION A Cl VISION OF r... e GARRETT CORPORATION P"'O!Nlll. ARIZONA The Garrett SORV is controlled by a Garrett-designed solenoid.

The solenoid is a direct-acting, three-way valve.

In this concept, electromagnetic. force is transmitted directly onto a ball, switching it between two seats.

The solenoid contains no delicate pilot mech-anisms or other devices which might stick or jam.

The electromagnetic force developed by the solenoid during actuation is on the order of several hundred pounds.

Paragraph 2.4 presents a description cf the design features of the solenoid.

2.3 Westinghouse Power-Operated Relief Valve 2.3.1 Major Comeonents - The major parts which comprise the Garrett 3-inch x 6-inch straight-through power-operated relief valve (PORV)

(Garrett Part 3750014), are illustrated in Figure 3 and are described in the following tabulation.

Find Component Number Descrietion Material 1

Body CRES SA182, GR F316 2

Bonnet CRES SA182, GR F316 3

Seat SA479, Type 316L (RCoCr-A hardf acing) 4 Solenoid Garrett designed 6,27 Studs SA453, GR 660 14,15,16 Seals 347 and Graphoil 24 Cage CRES A276, Type 21800 29 Plug CRES SA479, Type 316 (RCocr-A hardf acing) 2.3.2 Design Features and Operation - As shown in Figure 3, the Garrett straight-through PORV utilizes a "cartridge" closure element approach similar to that of the right-angle SORV discussed in para-graph 2.2.2.

The valve body,

bonnet, and
solenoid, and their respective studs and nuts, retain system pressure.as required by the ASME Boiler and Pressure Vessel Code,Section III, Class I.

The body also transmits and reacts external loads applied to the valve.

Valve operation and closure are performed by the cage, plug, and seat assembly, which are mechanically isolated from the pressure-retaining parts.

The valve seat is sealed with a sheet metal/Graphoil type Selco seal and is bolted into the body with ten high-strength A286 CRES bolts.

the seat, thus anchored, becomes the guide for the cage and plug assembly.

Once installed, the cage *captures the seat bolts.

The cage ID is guided on a raised ring on the seat and sealed by means of a carbon piston ring bore seal in the body just below the bonnet.

The plug OD is sealed by means of a carbon piston ring bore seal on the cage ID to form a closed volume over the plug. This closed volume is the actuator head chamber shown in Figure 1 and discussed in paragraph 2.1 above.

41-3088B Page 9

I J

I

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  • GARRETT PNEUMATIC SYSTEMS OIVISION

.. OIVISION OF r><E GARRETT CORPORATION PHOENIX. ARIZONA

  • The caged plug design has a number of inherent advantages over an uncaged plug-type valve.

When the plug is actuated to the open position, the plug sealing surface is retracted out of the flow stream, thus reducing or eliminating the possibility of erosion of the sealing surf ace by either high pressure steam or contaminants in the flow stream.

In addition, the annular arrangement of the cage flow holes focuses the flow stream in the center. of the cage, thus reducing flow velocities over the valve seat and thereby also reducing the possi-bility of erosion.

In addition, the cage/seat assembly acts as a dual orifice system with a two-stage pressure drop.

The reason for the differences in cage and seat flow areas in the various valves is 1) the need to vent the specified quantity of steam and/or water through the valve, and

2) to eliminate the possibility of saturated water flashing to steam upstream of the seat.

Compensation for thermal growth caused by differential heating rates between the valve cage and body is provided by a gap which is maintained between the bottom of the cage and the top of the seat.

When the valve is closed, the cage is held up against the bonnet by a light spring (Find Number 30).

When the valve opens, pressure forces the cage up into the bonnet with a high load, thus maintaining the gap between the base of the cage and the seat.

Even under worst-case thermal growth conditions, the seat-cage-bonnet stack is never such that the thermal compensator gap is reduced to zero.

Thus, the "floating" cage remains axially unloaded at all times, and thermal growth has no effect on operability of the valve.

Compensation for end load-induced deformation of the valve body is provided in much the same manner.

The diametral clearance between the cage and body in the area of the piston ring is an order of magni-tude larger than the worst possible deformation of the body in this region.

Even when maximum end loads are applied to the valve, the body never contacts the cage OD and no forces are transmitted between the two components.

The Garrett PORV incorporates redundant position switches.

Two of the switches are actuated when the valve is in the closed position and two are actuated when the valve is in the open position.

During the time that the valve is stroking between the open and closed posi-tions, all four switches maintain continuity.

The switches are actu-ated by means of a samarium/cobalt magnet which moves up and down with the plug inside the bonnet.

Thus, posit ion indication is obtained without penetration of the pressure boundary or the use of packings.

41-3088B Page 11

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OARRSTT ;:=INEl..:M.:01'1C SVSTSMS OIV!S10N I'.-...a*'"" *

~:. *

'S!C~ CF *:..f.J-.at:lll!?"* -::;:r0tr.""' ":"*-:"'

    • ~. a.. e!~1.1:.. a,z:~*

The Garrett

~CR"l is cont:::lled :,y a Ga::ett-desig~ed sol~noi=.

The so:.enoid is a di:ect-aetinq, three-way tTa!.~1e.

!:? -:!'lis concept, electromagnetic force is transmitted directly onto a oa:l, switching it between two seats.

~he solenoid contains ~o delicate ?ilot ~echan isms or other devices which might stic~ or jam.

T~e elect:~magneti:

force develo~ed by the solenoid during actuation is on the order o!

several hund:ed pounds.

aragraph 2.4 presents a description of the design features of t~e soler.oid.

2.4 :irec: Ac~!no, Three-Wav Solenoid

2. 4.1
'1aior Comconents -

The major parts which comprise the Garrett solenoids :or ~uclear ap9lications (Garrett ?arts 3750020 and 37500ZS) are illust:at9d in Figure 4 and are described in the followi~g tabula~

tion.

The only diff!!renc:e between the two designs is that:. !'art 3750028 is not equipped with position indicator switches, although it does include the magnet rod used for actuating t~e posit:on switches.

Par.t.3750028 is used on SORV 3150010 (Combustion Engineer in;), while Part 3750020 is used on PORV 3750014 (Westinghouse).

Find Number l

2 3

6 7

a Component Descrieton Sedy Pt"essure ~1essel Coil Assembly Cover A.r~at:ure Stop Ste:n Ball and Seat Asse~bly

~=.-::.. *..,

. -~ - --

Material SAl82, G~ :'3:6 SA4i9, Ty"S'e 34i Nickel clad co~cer with mE" glass"lnsu-latior.

1020 ni~~:l platec steel Car:?Emtet 430 Carpente: 430 ASTI~ A276,

~yp~ o~s

$21800 Stellite oa ~all and

~CoCr=A hard-f acec seats

GARRETT PNEUMATIC SYSTEMS OIVISION

.. ClVISION OF TMe G.. RReTT CORPORATION PHOENIX. ARIZONA FIGURE 4 COMPONENTS OF THREE-WAY SOLENOID VALVES GARRETT PARTS 3750020 AND 3750028 41-30885

  • Page 13
2. 4. 2 Desi an :"eat:.l!:'e:; anc iJ~e:ation i\\= shown i:'l :'igt.:=e

~,

~::e Garrett solenoid is a

direct-acting, three-way electromagnetic swiec::er 'lalve.

When power is applied to the sol'9r.oid coil, the resulting e.!.ect:oma9netic field focces the a:-mature down agaList the stop assembly with a larqe force :narg i:'1.

The armature ;:ushes t=:e solenoid stem down against t~e ball, moving it from the upper seat to t!'le Lowe!:' seat.

'!'he solenoid stem includes an over:ide mec!ianis:n which limits t:~e total force acclied to t:ie solerioid bal1. when it reacnes the lower seat, thus protecting both the ball and the seat

om camage.

When t~e solenoid i.s de-en.erg i zed, a t"et::.::~ s::: inc;

?Ushes t~e solenoid stem and armature oack to the ?Csi::on shewn.

A small :etur:'1 spring, plus t!'le inlet pressure force causes t!'le flal*,*e to

eturn to the upper seat.

oesi9n features of the Garrett solenoid incl~de the use of Carpenter 430 corrosion-resistant magnetic material i:i the armature and stop assembly, toqether with a hermetically sealed pressure vessel and body assembly.

All of the materials used in the constn1etion of the solenoid are.f.nor9anic.

The selenoid eoil is wrap?ed ;.,ith niokel-clad co9~er wire 'iilith "!" glass insulation.

The coil is also bifilat' wound to li:nit 11oltage spikes when t:ie solenoid is de-ene:gized.

The solenoid incorporates provisions for orifices i:-t ':oth

~he.

inlet ~ressure and discharqe vent lines.

These orifices can be sized to provide independent control of ~he opening and closing times cf =~e val7e on which the solenoid is installed according to the :equi:em~nts of eaeh individual customer.

3.

DESCRIPTION or ~RI/PW~ TEST VAL'i'.JE, ?AaT 32Z4il8-2 The valve selected for the EPRI/~WR Sa:ety and Relief ~1a.:*1e ':'est

~:og:am is Gar:ett Part 3224718-2.

The unit is a hogged out, fl3nged

~odel cf a st:ai;ht-:hrough power~operated :elief val~~ si=il~: to t~e Westi~ghouse valve.

!iqures 5 and 6 p:esent, :es-;iecti :;elj*,

ex:e:~al and c:oss-sei:tional t.riews of the test valve.

Figure 7 is a cross-section.al *1iew of the Garrett de11elopment mode!. ::iree-way soleno :..:

used to control the test valve.

~~is section of ~~e ~e~o:t p~~sents a Cisc~ssior. :: !i~!l::i :~:

ar:d

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  • 1~ I GARRETT PNEUMATIC SYSTEMS CIVISION

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~MOENIX. AFUZONA FIGURE S EPRI/PWR TEST VALVE GARRETT PART 3224718-2 41-30883 Page ::..:

Su~plv tQ Solenoi~

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Cac;e Guide a..'"l.d Ca.qe Rini; Sea!.

!n Sonnet (Bonnet Guice In Body) f.:om Sole~oid

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GARRETT PNEUMATIC SYSTEMS OIVISION

~ OIVISION OF THe G.ORReTT CORPORATION PHOENIX. ARIZONA I n I I 11

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i FIGURE 7 CROSS-SECTION OF GARRETT DEVELOPMENT SOLENOID 41-3088'.S Page :!.7

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O.l.RRETT ?NEUMATlC SYS'1'5MS OIVlSION

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4.1

~ain Val*1e Assemcl

As previously noted, Garrett ?art 3224718-2 was ereated s;iecifie-ally for t:he

~PRI/'PWR Safety and ~elief ~lal;re :'est Progra:n.

T!'?e.:e-fore, g:eat: care has been taken to make the unit representati'le of t!'le production models c~rrently beinq fur~ished to Westinghouse and Combustion Zngineering.

The only differences are in t:he cage and seat flow areas, and in the hcusinq ccnfiguration.

Part 3750010 is a right-angle design.

These points are discussed in greater detail in the following ?aragra;ihs.

4. l. l Inlet ?itie Area -

'!'he i.:ilet flange connection on pr:iduction units of Part 37500lcr has an area of 5.30~ square inches (2.600 inch nominal diameter}.

The welded inlet ecnnection on Part 3750014 has an area of 5.103 square inches (2~549 inch nominal diameter).

The inlet area of the test valY.Te, Part 3224 718, is 4. 909 square inches (2. 500 inch. nominal diamet~u:).

These variations are not:: significant with respect to the basic performance or operation of the valves.

4.l.2 Cischarae PiPe Area -

The discharge flange connection on Part 3750010 has an area of 43.59

~quare inc~es (7.45 inch nominal diameter) while Part 3750014 has a.welded discharge connection.,.,i th 22.28 sauare inches (S.326 inch nominal diameter).

The test val'le discharg"e *ar'!a is 28.27 squa:e inc.hes.(6000 i.nch nominal diameter).

Si!'nilar ly, these 'lar iations are not significant with respect to

~~e cas:c ?e~formance or operation of the valves.

4.1.J Seat Area - The seat flow details of the valves are as follows:

Part:

Seat Number Oiametee Flow Area inches square inc!'les 37500:!.0 2.135 3.580 3750014 1.420

l. 584 3224718-2 2.130 3.631

'!'he

~1ar!.ation in sea: diameters and flow a::eas :'?Oted a!:o,1e is a f:.m.ction of ':::.e cesi:ec ?ressure-e-e:ia*:i:i; c3paei':y a~c whet::.ec

':~e 7al~e s!:e ::.as ~een o;:~~!zed !or watac er s:~~~ !l=w.

~cwe7e:, :~e 7ac~~tic~ ~~ !::w a:eas ~as ~o e~~ec: en 7al7e

!~~c:io~ o: ~;~:~~~:

i:y.

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GARRETT PNEUMATIC SYSTEMS OIVISION 4 DIVISION OP THE GAAReTT CORPORA TIQN PHOENIX. ARIZONA 4.1. 4 Cage Configuration The ID of the cages at the flow holes on the production valves is 3.00 inches, whereas the test valve has a 2. 500-inch diameter cage. The pattern and details of the flow holes in each cage are described below.

Part Hole Number Diameter Hole Pattern Flow Area inch square inches 3750010 0.146 7 rows of 48 5.625 3750014 0.230 s rows of 32 6.648 3224718-2 0.142 7 rows of 38 4.213 The diameter of the cage and the pattern of flow holes depends on the desired pressure-relieving capacity i:tndwhether the valve has been optimized for water or steam flow.

As with the seat areas, the varia-tion in flow areas has no effect on valve function or operability.

4.2 General Similarities As shown in Figure 6, the EPRI/PWR test valve, Garrett Part 3224718-2, is generally representative of both of the production valves discussed in Section 2 above.

The test valve incorporates the following items which are also included.in the production valves *

1.

A bolt-down seat

2.

A "floating" cage* with a thermal compensation gap between the cage and seat

3.

Piloting of the cage on a register land of the seat

4.

Selco seals

s.

Hard faced seat and plug

6.

Carbon piston ring seal on plug

7.

Carbon piston ring seal on cage The differences between the production and test valves are primarily due to the fact that the test: valve was designed and produced before completion of the production designs.

These differ-ences include use of external solenoid tubing on the test valve rather than internal as on the production versions.

Also, the cage in the test model is Piloted on the bonnet which, in turn, is oiloted on the body.

In the production configuration, the cage pilots-directly into the body.

Finally, the test valve has a packing system to seal a rod that is connected to an tVDT for a readout of valve position.

This instrumentation is for test purposes only and the production valves use the magnetic reed switch system previously described.

41-30889 Page 19

4.3 Strai:ht-T~rouah ?ersus Riaht-Ancle Flow Housinc Both the EPRI/PWR test valve and t!'le

~iestinqhouse pr.,.oduc:tion valve are s~raic;ht-t~rough, 3 in. x 6 in.

?Ower-operate~* :elief

'lalves.

Th.e Combustion En9ineerinc; 'lalire is a 3 in. x 8 in. right angle design.

Although a ric;ht-angle val'le is somewhat different :rom a straight-through design from the standpoi!'!t of hydrodynamic: eff i-c:iency and external loading, the test results from the Garrett/EPRI test 11alve are considered fully applicable to the Combustion E:ng ineer-ing valve, Part 37500l0.

The variation in pressure reliev inc; capacity of a right angle versus st:aight-through valve is easily c:alc~lated once the discharge geometry is known.

All steam and water flows obtained duri:i.c; the EPRI test program can ~e applied to the right-angle CE valve design with a hiqh degree of eonfidence.

The 11cartridqe 19 closure desi9n of the Garrett* valve eliminates the possi.bili ty of valve binding due.to end load-induced deflections.

The worst case load possible for the Garrett 3 in. x a in.

ight angle soav is 33, 100 pounds of thrust against the discharge flange.

This is reacted to the associated structure as a 384,878 in.-lb moment through the inlet flange.

An analysis was.performed in which it ~as assumed that this moment would "ovalize" the flow :,ody in the reqion of the cage carbon piston ring seal.

The result of this analysis was that the body diameter would deform by minus 0.00116 inch in this

e~ion. Since the mini:num cage clearance with the body is 0.012 inch, or ten ti:nes as much, no exter::'lal load-induced binding can occur.

4.4 Solenoic T~e Garrett development solenoid shown in :'igur~ 7 is being used to control the E:PRI/PWR test valve, Part 3224718-2.

As shown, the development :nodel solenoid includes an eleetromac;netic coil of t~e same size as the ?roduetion model, a. three-way swi tch:ni; :nec:ha.ni. srn with a ball-type plu;, a mechanieal override on the solenoid stem to limit the total force applied to the ball during actuation, and a similar style body and ?ressure ~essel to retain system ?ressu:e.

Since t:ie *oa.sic i!"!.tent of t~e ::si~!/~W~ sa.eet::t.anc relief *1a:*1==

est was ;:i~aril? to ~emons::ate ~al~e o~erabili:7 ~~de: all co~di t.:*::ns of flO'N and ;:essu=e !.i!<ely

'::J :e at:ained in a~.

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tessu
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.:£nd not to i~.;ose -::::

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=~9 equi;~e~t. :~e Ga::==~= ~eve:o;~~~c sc:~~~i~

~:i:!:es ~a:e:ia:s ~i~!e:i~; !:orn =~cse !=~~d i!"!.

=~~ ;:cdu::i=~ sc:e-

!Oi-:s.

~~e C:~::J..:?rne~t 30!.-!r'..O!.*'! i.S !?..:.. ~C~io~a!.l~-

!"~?::se~~a:i*:: :: ~::s

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GARRETT PNEUMATIC SYSTEMS OIVISION

.. OIVISION OF TME G.. RRETT CORPOR.. TION PMOENIX, ARIZON..

CONCLUSIONS As discussed in the previous paragraphs, the Garrett/EPRI Test Valve, Part 3224718-2, is representative of both Garrett PORV designs presently in production.

Therefore, the results of the EPRI/~'"R Safety and Relief Valve Test are considered fully applicable to both the Combustion Engineering Solenoid-Operated Relief Valve, Part 3750010 (3 in. x 8 in. right-angle valve) and the Westinghouse Power-Operated Relief Valve, Part 3750014 (3 in. x 6 in. straight-through valve)

  • 41-3088B Page 21

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GARRETT PNEUMATIC SYSTEMS OIVISION

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APPENDIX 1 GARRETT STRAIGHT-THROUGH TEST VALVE PERFORMANCE AT MARSHALL STEAM STATION JANUARY 23, 1981 41-3088B Appendix 1

GARRETT PNEUMATIC SYSTEMS OIVISION A OIVISION OF TMe GAllReTT CORPORATION P'40ENIX. AAIZO"A GARRETT STRAIGHT-THROUGH TEST VALVE PERFORMANCE AT MARSHALL STEAM STATION JANUARY 23, 1981 Garrett straight-through power-operated relief

valve, Part 3224718-1, was tested in* the EPRI/PWR Safety and Relief Valve Test Program at Marshall Steam Station on January 23, 1981.

The valve configuration at that time was similar to that of the right angle valve shown in the attached Figure 1, except that Part 3224718-1 has a straight-through body and utilizes a linear potentiometer system for measuring plug position. The valve internal design included a single-piece cage and seat assembly held down by means of a Flexi tallic spring gasket, and an orificed plug controlled by a two way, piloted Valcor solenoid.

The valve was subjected to eleven cycles of operation at 2440 psig with dry, saturated steam.

The valve operated normally, with no tendency to fail to operate.

Internal leakage, which was zero at the beginning of the tes~, was 0.006 gpm at 2440 psig after two cycles, and 0.01 gpm at the end of eleven cycles. Following the conclusion of the official EPRI test, Garrett requested that a number of additional cycles be run on the valve.

After 66 unofficial cycles, the valve leakage continued at the 0. 01 gpm value.

Steam flow rates for all tests were 295,000 lb per hr

  • Following this test, the valve was disassembled and inspected.

All parts were in good condition following the 77 cycles of operation, except for the Flexitallic gaskets beneath the valve seat and at the body/bonnet interface.

The seat gasket was completely washed out and

. the body/bonnet *gasket was showing signs of distress.

The. washed-out seat gasket was considered to be the cause of the 0.01 gpm internal leakage rate.

Post-test analysis showed that the problem was caused by differ-ential thermal growth during the first opening cycle.

A Flexitallic gasket between the cage and bonnet had the dual function of holding the cage down against the seat gasket and compressing sufficiently to compensate for differential thermal growth.

The spring gasket proved unable to with stand the applied load and took a permanent set, thus allowi"ng the cage to become unloaded and lift.up off the seat gasket.

The seat gasket was therefore exposed to the scouring action of the steam ~nd all of the asbestos washed out during the first cycle of operation.

The valve then experienced the 0.01 gpm leakage beneath the seat.

41-3088B Appendix l Page 1

1.-~.:::-'1 GAPIRETT l'"IEUMA'l"IC SYS'l'5MS OtVISiON

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Si~ce the Marsha:l steam test p~cved t~at the original method of eom'Ele~satinc; :or the::nal g:o~.,t::* ;.ras inadequ.a to:, a ::rnmbee of C:es i;n changes we:e ~ade to ?art ~224il3-l and to the Combustion Engineering and Xestinc;house product-bn

~owe:-operated relief 7alves.

T~ese included:

l.

Cesignin; a se9arate, bolted down seat.

2.

Allow in~ the *1al11e cage to float for ther:nal compensa-tion.

3.

Replacing the seat and body/bon!'!e': :'lexi':allics with Selco sea!.s.

4.

Changing the ca9e-to-bor.net saal from a Flexitallic to a carbon piston ring =ore=seal.

In additionf at t~e time of the Marshall test, Garrett was in the process o: changing the production ?ORVs f:om a Valcor, ?iloted, two-way solenoid to a Gar:ett cesi;ned and manufactured, direct-acting p three-way solenoid.

The three-way solenoid desi;n was j udc;ed to g i 11e

!:letter eontrol of 'lalve operation.

Therefo:e, Pa:t 3224718-l was modifi;d to accept the Garrett t:u*~e-way solenoid.

Clo'3'*4'!....,,.,

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Garrett Pneumatic Systems Division FIGURE l ORIFICE BONNET

~~........._*CAGE FILTER HOLES PLUG VALVE BODY 111 So. 34th St.

?. 0. Box 5217 Phoenix Arizona 85010 602-267-3011 niTERNAL CONFIGURATION AND METHOD OF OPERATION ARE IOENTICAL TO THOSE OF THE GARRETT STRAIGHT THROUGH TEST VALVE TESTED AT MARSHALL STF.AM STATION.

41-3088B Appendix l Page 3 A Division of ine Garrett Coroora!lon

B7 - MASONEILAN

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