ML18047A451

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Power Operated Relief Valves (PORV) PWRs Safety & Relief Valve Test Program, Justification Rept SV-177,Revision 1
ML18047A451
Person / Time
Site: Palisades Entergy icon.png
Issue date: 11/16/1981
From: Beck J, Bolger F, Huffman R
DRESSER INDUSTRIES, INC.
To:
Shared Package
ML18047A442 List:
References
SV-177, SV-177-R01, SV-177-R1, NUDOCS 8207160346
Download: ML18047A451 (40)
v • d • e


Text

DRESSER INDUSTRIES

... -*-=-**._...,_;.*,*-******.-::****...

SV-177 Rev. 1 Page 1 of 39 INDUSTRIAL VALVE & INSTRUMENT DIVISION Cl acx 143C Cl ALEXANDRIA, L.CUISIANA 713C1 TEL.. 31S/64C*22SC C] TWX: 51C*976*5733 CJ TEL.EX: 59*6423 CJ C:ASl.E: CIVIC POWER OPERATED RELIEF VALVES (PORV)

PRESSURIZED WATER REACTORS SAFETY AND RELIEF VALVE TEST PROGRAM JUSTIFICATION REPORT SV-177 Prepared For Electric Power Research Institute Safety and Analysis Department Nuclear Power Division Prepared By*.R?7<Z'~

R. s. Huffman Reviewed By:

Approved By:

Sr. Product Engineer F. P. Bolger Chief Engineer Consolidated Valves

/1'1

I nu~

0 J. D. Beck Manager, Product Engineering ASHC:RCF'T CJ HANCCCIC CJ CCNSCl.IOATEO C! HEISE DAEa9Clll INO\\,l*T"IE., INC.

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I PDR ADOCK 05000255 i

P PDR Date I l. I(,. *? J Date Date

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Paragraph loO Paragraph 2.0 Paragraph 3. 0 Paragraph 4*.o Paragraph 5. 0 TABLE OF CONTENTS Introduc:t:ion SV-177 Rev. 1 Page Z of 39 Description of the Basic Valve Model Selec:t:ed Test Valves Design Variat:ions Between PWR Plant Valves

& Selecte~ Test Valves Conclusion

LO

1.1 INTRODUCTION

SV-177 Rev. 1 Page 3 of 39 The Power Operated Relief Valve (PORV).made and supplied by Industrial Valve Operations of Dresser Industries, Incorporated, for use in Pressurized Water Reactors (PWR) is sold under the trademark "Electro-matic" (Type 31533VX).

The PORV is a pilot operated relief valve whose pilot is actuated by an electrical, push action solenoid.

The principles of design for all PORV's in service or intended for service in domestic PWR's are the same.

For participating utilities, Dresser has supplied PORV's for twenty-three (23) nuclear PWR plants.

A total of thirty-six (36) valves including spares have been supplied for these plants.

Table l lists PORV's by utility, plant, valve model number, size, and description.

These valves are usually supplied with a bellows in the pilot valve to prevent steam leakage past the pilot stem.

A bellows _is indicated by a

-30 suffix on the model number, e.g.

31533VX-30; There are two seat sizes in these models.

Most valves have an 1-5/16 nominal inside diameter seat.

However, a 1-5/8 nominal seat also exists and is flagged in Table l with a note following the model number, e.g.

31533VX; 1-5/8 seat*.

There are two design models known as dash one and dash two.

The design is indicated by a -1 or -2 suffix on the model number, e.g.

"31533VX-l~

For valves with bellows, the design number follows the -30 suffix, e.g.

31533VX-30-l.

It is Dresser's intention that all valves of the -1 design will eventually be field modified with -2 design internal parts.

Conversion parts are available for the modification.

SV-177 Rev. l Page 4 of 39 In Table l, valves of the -l design for which conversion parts have been pu:i:-chased are flagged with a note in the model column, e.g.

  • 11S33VX-30-l; -2 internals~

Additional details are found in para-graphs 2.0 and 4.0 of this report.

Within any one valve model, the variable features are:

(l)

Inlet size, pressure rating, and facing; (2)

Outlet size, pressure rating, and facing; (3)

Bore; (4)

Solenoid electrical. rating; and (5)

Drain and pilot vent size and type.

Variable features are listed in the description column of !able l.

U'l"Il.ITY J\\rknn::ws Power

& Liglit Co.

Ball imore

<:as & Elect.

Company Consumer Pwr.

Company Consumer Pwr.

Company Duke Power Company Flor.Ida Pwr. Corp.

Pl.At~"!'

Nuc. One llnJt l Calvert Cl.Hfs 1 & 2 Palisades Midland l & 2 Oconee 1,2 & )

Crystal ru ver 3 LT.ST OF PWR UTILITIES, PL AND POWER OPERATED RELIEF VALVES

.. 177

.v. l (PARTIC INC UTILITIES)

DRESSER MODEL 31533VX ELECTROMATIC RELIEF VALVE l'tage 5 of 39 VAi.VE MODEL NO. & DESCRil'1'IuN IJRAWING tfO.

QTY.

HODEL 3CP1548 1

31533VX-30-l 3CP1356 4

3NC069 1

3CP1687 2

4CP2433 1

3CP1.548 3

3CP1548 l

1

-2 Internals 31533VX-30-l

-2 Internals Spare Valve 31533VX-30-2 31533VX-l 1-5/8 Seat 31533VX-30-2 31533VX-30-l

-2 Internals 31533VX-30-1.

-2 Internals Spare Valve 31533VX-30-2 1-5/32 Bore SlZB & nESCRIP'f ION Inlet:

2~" 25001/ ANSI Raised Face Flange except thi.ckness.*

Outlet:

4" 60011 ANSI Raised Face Flange Bore:

1-3/32" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

~-14NPT Inlet:

2!:!" 250011 ANSI Small Tongue Flange thickness. t<

Outlet:

4" 30011 ANSI Raised Face Flange Bore:

1-5 /16" Solenoid: 460 Volts, A.C.

Drain & Pilot Vent:

~ Socket Weld except Inlet:

2~" 25001/ ANSI Small Groove Flange except thickness.*

Outlet:

4" 30011 ANSI Small Groove Flange Bore:

1-3/8" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

~-1'1NPT Inlet:

212 11 250011 ANSI Raised Face Flange except thickness.*

Outlet:

4" 6001/ ANSI Raised Face Flange Bore:

1-5/32 11 Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

~-14NPT Inlet:

2~" 25001/ ANSI Raised Face Flange except thickness.*

Outlet:

4" 600/I ANSI Raised Face Flange Bore:

1-3/32" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

~-14NPT Inlet:

2~" 250011 tMSl Raised Face Flange except thickness.

Outliet:

4" 60011 ANSI Raised Face Flange Bore:

1-5/16 11 Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

~-14NPT

I :\\ ~. I.

ll'i' I I. I '1'i

      • -* * - --r F l111* IJa 1*,.,,r.

Corp.

Fl lit" Ida l'wr.

Corp.

Ma lne Y<mlwe Al om I c l'ower Company MeLrnpoU !:am Fd ll:wn Co.

l'L\\I.I St. f.u c l tl l St. l.11cle 2 Ma.lne Yankee Thn~e HI le ls land f

    • l!AUHYO: llP.

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3CP1356 2

3NC082 l

3NC039 2

3CP1547 2

3CP1548 l

JNC020 1

..1111'.l".

3153JVX-30-l

-2 Internals Spare Valve 315.lJVX-30-2 3 l.533VX-30-2 31533VX-30-l ns:nvx-Jo-1

-2 Inter~als Spare Valve 31533VX-J0-2

~;v.. 177 I<.:" l Llf~,6\\)t' J9 Inlet:

2~" 2500/I ANSI Small Tongue 1"lange excepl thlcknes1:1.

  • Outlet:

4 11 300/I ANSI Raised Face Flange Bore:

1-5/32" Solenoid: 460 Volts, A.C.

Drain & Pilot Vent:

~ Socket Weld Inlet:

2!i" 2500/I ANSI Large Tongue Flange except thickness.

  • Outlet:

4 11 600/J ANSI Raised Face Flange Bore:

1-5/1611 Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

13 Socket Weld Inlet:

2~" 2500// ANSI Large Tongue Flange except thickness.

  • Outlet~

411 300/J ANSI Raised Face Flange Bore:

1-5/1611 Solenoid: 440 Volts, A.C.

Drain & Pilot Vent:

~-14NPT Inlet:

2~

11 2500/J ANSI Raised Face Flange except thickness.

  • OuUelt:

4" 600/I ANSI Raised Face Flange Bore~

1-3/32 11 Solenoid: 250 Volts, D.C.

Drain & Pilot Vent:

~-14NPT

~--------------------------------------

Met ropo i It* mi fal limn Co, Nor l he*rnt llt a I I l A es Three Md ie foland 2 Mfl]stoue 2 3CP1570 l

JCP1720 2

4CP2419 l

31533VX-30-l 31533VX-30-]

Spare Valve 31533VX-30-l Inlet i 2~" 2500# ANSI Raised Face lo'lange except thickness.

  • Outlet:

4u 60011 ANSI Raised l~ace Flange Bore:

1-5/16" Solenoid: 125 Volts, O.C.

Drain & Pilot Vent:

!3-14NPT Inlet:

2!3" 25001/ ANSI Small Tongue nange except thickness.

  • Outlet*

4" 600/I ANSl Raif:led Face Flange Bore:

l-5/16°1 Solenoid: 125 Volts, O.C.

Drain & Pilot Vent:

~Socket Weld

UTILITY Omaha Public Power lli st.

Portland C.E.

Company Sacramento Mun ieipa I LI t i 1.i ty District Tennessee Valley Authority Washington Puhl ic Pwr.

Supply System PIANT Ft. Calhoun Pebble Sprlngs

]

Rancho Seco Bellefonte l & 2 Project l & 4 DRAWING NO.

~

3CP4208 2

4CP2433 l

3CP1548 1

4CP2398 l

4CP2227 2

4CP2292 2

t'Minim11111 flange thickness provided is 3".

ANSC minimum thJcknc~ss Js 2!:!".

177

. l age 7 of 39 VALVE MODEL NO. & DESCRIPTION MODEL 31533VX-30-l 1-5/8 Seat 31533VX-30-2 31533VX-30-l

-2 Internals Spare Valve 31533VX-30-l

-2 Internals 31533VX-30-2 31533VX-30-2 SIZE & DESCRIPTION Inlet:

2!2" 250011 ANSI Small Groove Flange except thickness.

  • Outlet:

4" 30011 ANSI Small Groove Plange Bore:

1-3/32" Solenoid: 460 Volts, A.C.

Drain & Pilot Vent:

~-14NPT Inlet:

2~" 2500/J ANSI Raised Face Flange exce1Tt thicknesa.

  • Outlet:

4 11 600// ANSI Raised Face Flange Bore:

1-5/16" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent: * ~-14NPT Inlet:

2!211 250011 ANSI Raised Face Flange except thickness.*

Outlet:

4" 600// ANSI Raised Face Flange Bore:

1-5/32" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:.

~-14NPT Inlet:

2~" 250011 ANSI Raised Face Flange except thickness.*

Outlet:

l1" 60011 ANSI Raised Face Flange Bore:

1-5/16" Solenoid: 120 Volts, A.C.

Drain & Pilot Vent:

!.a-14NPT Inlet:

2!.a" 250011 ANSI Raised Face Flange except thickness.*

Outlet:

4" 60011 ANSI Raised Face Flange Bore:

1-5/16" Solenoid: 125 Volts, D.C.

Drain & Pilot Vent:

!.a-14NPT

MAlN VAi.VE Cagt! tub Not Shown ----

Jt'lGURE l SlmpUUetll Cross-Secltion Of A Basic Valve Model 8

A OUTLET 8

INT.ET 1--*-

Main Main lipper Spindle Seat Disc Cage (Hae 4 Ribs Equally Spaced)

Guide M2in Disc Spiring F

Guide ~ing ?lug l

Pilot Diec I

Spring

_._ __ Plunger Lever Seat Bushing

  • Bellows Piston PILOT VENT PII.OT VALVE SV-177 Rev. 1 Pag.39

2.0 DESCRIPTION

OF THE BASIC VALVE MODEL 2.1 Operation SV-177 Rev. 1 Page 9 of 39 Valve operation is similar for all PORV's.

A simplified cross-section of a basic valve model is shown in Figure 1.

The PORV consists of a main valve and a pilot valve.

The main disc and the pilot disc are held on their seats by inlet pressure.

To open the main valve, the pressure under the main disc is reduced by opening the pilot valve.

To close the valve, the pressure under the main disc is increased by closing __ the pilot valve.

Steam under pressure from the vessel enters the main valve through the inlet Chamber A and passes upward through the ribs of the cage into Chamber B around the main disc near the main seat.

Steam enters Chamber C by passing through Port D, through the clearance between the main disc and guide, through the clearance between the guide and cage, and through Threads E.

The main disc is held in a closed position by pressure in Chamber C and by the main disc spring.

Steam passes through Port F into Chamber G around and underneath the pilot disc.

The pilot disc is held in a closE?d-position by pressure in Chamber G and by the pilot disc spring.

When the solenoid is energized, the plunger moves downward striking the lever with sufficient force to cause downward motion of the upper spindle, piston, lower spindle, and pilot disc.

As the pilot disc moves off its seat in the downward direction, steam escapes from Chamber C through Port F and Chamber G across the pilot seat to the pilot vent.

The total area supplying steam into Chamber C is less than the area exhausting Chamber C.

SV-177 Rev.l Page 10 of 39 Therefore, steam pressure is released at a faster rate from Chamber C than is supplied.

The resultant unbalanced steam pressure in Chambers B and C produces a force which moves the main disc downward from its seat permitting steam from Chamber A to escape through Chamber B across

  • the main seat to the main valve outlet.

When the solenoid is de-energized, the solenoid plunger moves upward to its closed position by the force of ehe solenoid springs.

Since the mechanical force is removed, steam pressure and spring force move the pilot disc upward against its seat.

When the pilot valve closes, steam pressure builds up in Chamber C closing the main disc.

The switch when connected to a lamp in an instrument panel will energize q

the lamp when the solenoid plunger is fully extended.

When the solenoid is energized and the solenoid plunger moves downward to open position, the plunger comes in contact with the actuator lever of the switch thus completing the circuit and energizing the lamp.

The lamp when lit indi-cates the solenoid is fully open.

2.2 Openir.g Pressure Valve operation is similar for all the Electromatics.

The main disc is held on its seat by force caused by the differential areas under inlet pressure.

To open the valve the pressure behind the disc (Chamber C) is reduced by opening the pilot valve.

The amount of pressure reduc.tion (Pz) is calculated by:

SV-177 Rev. 1 Page 11 of 39

=

(Total disc area minus disc seat area) p2 pl Total disc area

= Opening equilibrium pressure P1 = Inlet pressure, psig Pressure behind the disc must be less than this value (P2) for the valve to open.

2.3 Closing Pressure The closing pressure takes into consideration the establishment of critical (.60 P1)_flow across the face of the main disc when the main

-valve is fully open.

This increases the opening forces and requires a higher value of P 2 for closing_

  • Also, if a pressure higher than.60 P1 is present in the discharge area, either from back pressure or from the ins,,t:allation of a "choke",

a value of P2 higher than indicated will be required to reach closing equilibrium.

  • 2.4 Back Pressure Except as pointed out in the preceding paragraph, the main valve is not affected by back pressure.

In general, back pressure assists in opening the main valve and retards the closing.

The flow rate of steam entering Chamber C is the important parameter and flow out of Chamber C through the pilot vent must be greater than this value if pressure in Chamber C is to be reduced.

The level to which the P2 pressure must be reduced determines the back pressure against which the pilot can discharge.

2.5 Bore Size and Capacity SV-177 Rev. l Page 12 of 39 In these valves, there are a number of orifice sizes used, within the same body configuration.

The orifice size is the area in square inches of the smallest bore in the valve outlet.

Bore sizes from 13/16" thru l-5/8" can be provided in 1/32" increments.

See Figure 7.

As the valve opens, steam flow is throttled as it passes the main seat and is reduced again as it expands through the orifice which ultimately determines the total steam flow capacity.

Valve lift, which is the downward motion of the main disc, is sufficient to develop a curtain area at the valve seat which is greater than the orifice area.

The orifice size is usually determined by using the ASME formula and a flow coefficient of 0. 9.

A '"' W 7 51. SPK A a required orifice size, sq. in.

W ~ required steam flow, lbs/hr.

P *set pressure +14.7, psia, at 0% accumulation K s flow coefficient 2.6 Design Conditions The basic valve model has a design pressure of 2500 psig and a design eemperature of i00°F.

The valve is designed for saturated steam service.

!he valve is not designed for, nor tested by Dresser on any other flow media.

2.7 The Solenoid SV-177 Rev.

1 Page 13 of 39 The solenoid is used to convert electrical energy into straight-line mechanic energy.

A "Push" type action is used to exert a mechanical force on the lever arm to effect pilot valve operation.

Solenoid selection is determined by customer's specified power source and the force load to be moved through distance.

All solenoids are manu-factured by the General Electric Co.

All solenoids have Class H insulation and epoxy (glyptoil) sealant.

2.8 Material of Construction Figure 3 provides typical materials of construction for the basic valve model.

It also provides a typical Quality Assurance Plan.

Materials of construction for all valves are the same.

However, some materials formerly procured to ASTM specifications are now procured to identical ASME specifications *

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. :';\\:::QUALITY CONTROL PLAN CONSOLIDATED ELECTROMATIC RELIEF VALVE z

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3.0 SELECTED TEST VALVES SV..J.77 Rev. l Page 19 of 39 3.1 Two valves *are selected for the EPRI Test Program.

These *are*,:

(1)

Model:

31533VX-30-2 Utility:

Florida Power & Light Co.

Plant:

St. Lucie 2 Drawing:

3NC039 (8 pages)

(2)

Model:

31533VX-30-2 Utility:

Portland General Electric Co.

Plant:

Pebble Springs 1 Drawing:

4CP-2433 A reduced copy of drawing 3NC039 for the St. Lucie 2 valve follows.

The drawing for the valve intended for the Pebble Springs 1 is not readable when reduced to the 8~" x 11" format.

For that reason, it is.not included in this report.

However, it is the same as the St.

Lucie 2 valve except for:

(1)

Inlet facing is a raised face; (2)

Drain and pilot vent connections are threaded (~-14NPT); and (3)

Construction Code is ASME Section III, 1971 Edition, Summer 1972 Addenda, Class 1 Component.

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Sensing. Tube, Dash Two Design SV-177 Rev. 1 Page 32of 39 Sensing Tube Pilot Tube

4.0 SV-177 Rev. 1 Page 33 of 39 DESIGN VARIATIONS BETWEEN PWR PLANT VALVES & SELECTED TEST VALVES 4.1 Development History Developmen.t of the Dash One Design was completed in 1970 and no revisions were made to the design until 1977.

Steam flow certi-fication tests were performed by the National Board in 1973, but were not renewed and so lapsed in 1978.

Non-destructive examinations of material followed the various codes and customer requirements.

The Dash One Design encompasses two seat sizes:

1-5/16" seat and 1-5/8" seat.

The seat size designation is the nominal inside diameter of the main seat in the body.

See Figure 4.

All valves, except those for Palisades and Ft. Calhoun, have 1-5/16" seats.

Palisades and Ft.

Calhoun have only valves with 1-5/8" seats.

The Dash One Design includes bellows and non-bellows valves.

All valves, except those for Palisades, have bellows.

The Palisades Plant has the only valves without a bellows.

See Figure 6.

In 1977, the Dash Two Design was released.

The need to improve seat tightness of the commercial PORV's precipitated this change.

The prominent feature was to provide a thermolip" on the main disc seat.

See Figures 4 through 9.

The Dash Two Design change consisted of:

(1)

~ain Valve Disc.

The seat was changed to a thermolip to im-prove seat tightness.

(2)

Piston Ring.

The piston ring was deleted from the design to reduce impact loads on the guide retaining plug.

\\.

SV-li7 Rev. 1 Page 34 of 39 (3)

Guide Retainer Plug.

The thickness of the flange portion was increased to allow maximum thread engagement and to increase strength.

(4)

Guide.

The overall length was shortened to compensate for the thicker guide retainer plug.

(5)

Sensing Tube.

To eliminate expansion stresses which distort the cage and lead to seat leakage, the one piece sensing tube was made into two separate parts.

(6)

Locking System.

The locking system for the guide retainer plug was simplified.

(7)

Main Body Weld.

The main body weld was relocated to improve weld penetration.

(8)

Main Body Wall.

The main body wall thickness was increased to comply with revised ASME Section III Code requirements.

This resulted in a larger body outside diameter.

(9)

Inlet Flange Bolting.

Because the larger resultant body outside diameter interferred with the inlet stud nuts on the backside of the valve inlet flange and in order to maintain field inter-changeability, the inlet flange was "studded" in lieu of through bolting.

In 1978, a program was initiated to field modify valves of the Dash One Design by replacing the corresponding internal parts of the Dash Two Design.

The sensing tube is not affected by this field modification.

SV-177 Rev. l Page 35 of 39 As of August 1981, four PWR Plants have not purchased parts for this field modification.

These are:

(1)

Palisades

  • '\\,

(2)

Maine Yankee (3)

Three Mile Island 2 (4)

Ft. Calhoun 4.2 Valve Models A review of Table 1 will show that there are five valve models identified.

These are:

Cl) 31533VX-l, 1-5/8 seat, without bellows

(.2) 31533VX-30-l, 1-5/8 seat, with bellows (3) 31533VX-30-l, 1-5/16 seat, with bellows (4) 31533VX-30-l, 1-5/16 seat, with bellows; with Dash Two internal parts (5) 31533VX-30-2, 1-5/16 seat, with bellows The two selected valves for the EPRI testing program are 31533VX-30-2, 1-5/16 seat, with bellows.

4.3 Comparison of Valve Models The important design variations between the five models listed in the above paragraph are:

(1)

Orifice size (2)

Seat size (3)

Main disc/guide interface (4)

Pilot vent system (5)

Body wall thickness (6)

Outlet flange size

4.3.l 4.3.2 4.3.3 Orifice Size SV-177 Rev. l Page 36 of 39 The bore sizes listed in Table,l vary from 1-3/32" to 1-3/8".

Orifice size is the area of the specified bore.

Orifice size affects valve capacity, but ttot performance, since the valve functions as a result of pressure ratios rather than an abso-lute valve of pressure.

Seat Size As noted in Paragraph 2.2, seat size affects valve opening pressure.

Since the differential area is a decreasing function, opening pressure decreases inversely as seat area increases for a disc of constant total area.

As previously stated, there are two main seat sizes~ 1-5/16" and l=5/8no Obviously, the larger seat has ehe smaller differential area.

Therefore, it follows that the valve with the larger seat has the lower opening pressure.

Main. 0*1sc/Guide Interface The clearance area at the main disc/guide interface is greater in the valves with Dash Two internals.

Therefore, the flow rate into the chamber under the main disc is higher.

The capacity of the pilot must exceed this flow rate in order for the main valve to open.

In this sense, the Dash Two design is more restrictive than the Dash One design.

4.3.4 Pilot Vent System SV-177 Rev. 1 Page 37 of 39 As shown in Figure 8, the sensing tube is one piece in the Dash One design.

It has an inside diameter of 7/16" which matches the pilot orifice as the limiting orifice in the pilot vent system.

As shown in Figure 9, the sensing tube consists of two separate pieces in the Dash Two design.

The tube insert as shown in Figure 9 has a restricting orifice of 3/8" diameter which is the limiting orifice in the pilot vent system.

This smaller orifice reduces the steam flow rate out of the chamber under main disc.

The restriction helps to reduce main disc impact velocity during saturated steam operation which is considered an advantage.

But it has the disad-vantage of reducing the permissible back pressure against which the pilot can discharge as discussed in Paragraph 2.4.

In this sense, the Dash Two design is more restrictive.

The 1-5/16" seat valve when fitted with a bellows may be used up to 700 psig back pressure.

The 1-5/8" seat valve when fitted with a bellows may be used up to 500 psig back pressure.

Those valves without a bellows are for "No Back Pressure" applications, where the valves are exhausting to atmosphere.

4.3.5 Body Wall Thickness and Outlet Flange Size SV-177 Rev. 1 Page 38 of 39 The actual minimum wall thickness of the main valve body is thinner in valves of the Dash One design., The main valve body of the Dash One design has a 5/8 nominal wall thickness whereas the body of Dash Two design has a 15/16 nominal wall.

In addition, some valves on the Dash One design have a 300# ANSI pressure rating outlet flange.

Most valves have a 600# rated outlet flange.

Considering internal design pressure and temperature only, the thinner wall is acceptable per the ASME/ANSI Code to which the valve was constructed.

As previously stated, the design pressure and temperature is 2500 psig and 700°F.

Considering outlet pressure and temperature only, a 300# ANSI pressure rated flange is acceptable where the valve buyer specified a 500 psig back pressure in his contract specification.

The thinner wall and the smaller outlet flange affects permissible piping and seismic loads to which the valve may be subjected.

The permissible piping loads and seismic loads can be verified by analysis.

5.0 CONCLUSION

SV-177 Rev. l Page 39 of 39 Although there is a possible argument for selecting for the tests valves which have been installed and in use for a number of years as opposed to newly manufactured valves, it would be difficult to achieve this in practice.

There is first the problem of obtaining valves for prolonged testing which are at present used by utilities.

There are also the handling and control difficulties which will be presented by a valve which is highly radioactive.

Any attempt to decontaminate the valve would tend to nullify the tests.

In fact, it is believed that there is no real need to become involved in such a potentially troublesome test program.

The affect of radia-tion aging of the materials used in valve construction is well known and has been defined by many reliable authorities which it is un-necessary to quote here.

The total radiation dosage is comparatively small and those operating components which may be the most affected are replaced under normal maintenance procedures at regular intervals.

This also applies in the case of wear or fatigue.

There is very little wear experienced in the valve in general because of the limited number of operating cycles and certainly, in the case of PWR's there is no possibility of fatigue failure from vibration.

The two PORV's selected for the EPRI testing program are of the latest model, Dash Two, and have 1-5/16" orifice bores.

These valves are representative of all PORV' s in service or intended for service in PWR plants listed in Table 1.

The principles of design for all PORVr' s listed in Table 1 are the same.

It can be shown analytically that the Dash Two design is the most restrictive design.

Any test data may be transferred to other models with complete confidence of their qualification.

BS - FISHER CONTROLS COMPANY

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