ML18047A458

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Power Operated Relief Valve Justification Rept.
ML18047A458
Person / Time
Site: Palisades Entergy icon.png
Issue date: 06/29/1981
From:
TARGET ROCK CORP.
To:
Shared Package
ML18047A442 List:
References
3070, 81CC-001, 81CC-1, NUDOCS 8207160353
Download: ML18047A458 (12)
v • d • e


Text

COPY NO. REPORT NO. 3070 PROJECT NO. SlCC-001 DATE 6/29/81 TOTAL PAGES 10 POWER OPERATED RELIEF VALVE JUSTIFICATION REPORT PER EPRI LETl'ER, JUNE 4, 1981 TARGET ROCK CORPORATION

!AST FARMINGDAL!, LONG ISLAND, N. Y.

0201160353 820401 PDR ADOCK 050002S5 p PDR

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)**( .- ~fi:.....:.. EAST FARF.CINGDALE, LONG ISLAND, N. Y. 30i0 CJllEC .. U l'f J'iJ.~~--~-~-~~*~***;:-;;-;:-1-------------------1 P.;;.OJ&CT SlCC

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REVISIONS X 11 PAGE CHAP:GED THIS REV.

L!TTElt D!SCRI PTI ON DATE BY APP. O:= NO CHANGES THIS REV.

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-~ First Issue 6/29/81 ~MCC I~ TITL.E x

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TARGET ROCK CORPORATION r AG II 1 0 F 10 EAST FARMJ:-.;GD.UE LONG ISLAND. ~. Y. a II P 0 a T 3070 C H!ClllD II'! *..*......*

APPlllOVKD IT

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1.0 INTRODUCTION

a. The Ta:rget Rock Corporation Power Operated Relief Valve is a 2 l/2"x 4" Solenoid Operated Globe Valve, TRC Model BlCC-001.

The Assembly Drawing Parts List for this valve model is TRC Drawing Number SlCC-201.

b. At this writing the TRC 2 1/2" x 4" PORV is intended to be installed at the following plants.

UTILITY PLANTS VALVE MODEL Consumers Power Co. Midland Plants 1 & 2 BlCC-001 D~WING NUMBERS QUANTITIES OF VALVES Project Control Drawing: SlCC-001 1 each plant

  • Assembly Drawing & Parts List: SlCC-201

2.0 DESCRIPTION

OF THE BASIC VALVE MODEL The Target Rock Corporation 2 1/2" x 4" Power Operated Relief Valve is a Solenoid Operated, internally piloted, globe valve design. Refer to Assembly Drawing No. SlCC-201.

This valve contains a main disc which is press1.ire seated by the fluid on the upstream (butt-weld end) side *of the valve. A pilot disc is contained within the main disc. Energization of the solenoid coil lifts the pilot disc off its seat in thA main disc and drops pressure from the volume above the main disc. When the pressure in this volume has dropped to approximately half the upstream pressure, the main disc will be hydraulically lifted from its seat.

P'alPAA&D aT TARGET ROCK CORPORATION P41:&

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  • PaOJ8C:T 81CC When the solenoid is de-enerqized, the pilot disc is reseated in the main disc. This allows the upstream pressure to*enter, the volilme abo~ the main disc. This build-up of pressure in this volume recloses the main disc hydraulic~lly *.

A push rod and magnet is attached via several connecting members to the main disc. When the main. disc moves, the magnet is positively moved a distance equal to the main disc lift. This maqnet. motion is picked up by reed switches to provide a positive indication of main disc position. For systems checkout the main disc with the attached magnet can be magnetically opened and closed, since (as described above) for the absence of a pressure differential across the valve, the solenoid force is sufficient to lift the main disc against the force of its return sprinq"

'l'his hydraulic forQ! liftinq the main disc is aided by a solenoid fo1:'c:e which, acting on the moveable core, contributes force sufficient to lift the main disc against the force of its return spring.

All pilot disc and main disc seating surfaces in this valve are hardsurfaced to provide tight seating and resistance to wire drawing at high differential pressures. The magnetic circuit parts internal to t.'li.e bonnet pressure bounda.ry are made f'=om annealed 410 Stainless Steel and are chrome plated. Pressure boundary parts (body, bonnet tt:l:le, indicator tube, and main disc) a=e made of 300 series stainless steel. All ot.'1.er trim parts are also made of corrosion resistant materials. The val*1e bonnet is screwed into t..'1.e body. This joint is then seal welded to provide ze~o leakage to the

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3.0. SELECTED TEST VALVE The valve selected for the EPRI test, TRC Model BOX-006, is the prototype of the Model SlCC-001 production valve. The assembly drawing for this test valve is TRC Drawing Number 1052020-1.

4.0 DESIGN VARIATIONS BETWEEN PWR PLANT VALVES AND SELECTED TEST VALVE As a result of testing of the Target Rock Corporation 2 1/2" x 4" Power Operated Relief Valve, Test Model BOX-006, both in-house and at EPRI test sites, a nu.'Tlber of minor changes have been incorporated into the production model PORV BlCC-001. These are described below:

J.. Magnetic Circuit: Enlargement of the diameter of the bonnet tube at its upper end, shortening of the moveable core, and increasing the ampere turns.of the solenoid coil, all contribute to increasing the force margin for solenoid actuation under normal and accident conditions.

2. Guidance between plunger and moveable core: The test model relief upon the bonnet wall to guide both the plunger and the moveabl'e core. However, scratch marks found on both parts, and on the inside surface of the bonnet tube indicated a need for improving the guidance between these parts. Alt.~ough these scratches are not regarded a~ a problem, the guidance between the plunger and the moveable core has been.improved on the production model by tightening machining tolerances of plating parts.

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3. Length of Valve Stroke: Since the desireQ flow through the production model is less than that ex.."'li!Jited by the test model, the valve strcke (main disc li.ft) has been reduced from 0.439" to .300".
4. Pilot Seat Material: The test valve pilot seat was made of "Haynes 25", Condition a-7. Since AS~IE. Code requirements do not pe%mit welding this material tc t.~e stainless steel

~n disc, the pilot seat will be made of Stellite No. 6, directly applied to the pilot seat a:rea of the main disc.

5. Piston Rings: Probable closure of the piston ring gaps during extremely rapid temperature transient tests (l00°F to 6S0°F in less than one second) will be averted by increasing the installed ring gaps to 0. 040". The piston ring grooves have been moved approximately l/2" higher on the main disc, since it was observed after EPRI tests at Marshall Steam Plant that heavy contact between the main disc and the hardened sleeve in the body was causing localized scratc::.~es in the disc material.

Although this scratching would not usually be considered as causing a problem, some metal was upset into the ring grooves, interfering wit.~ the rings' free expansion. Moving the piston ring grooves away from the scratc.~ed area will prevent this.

6. Sleeve Material: The hardened sleeve in the body, against which r,.**O\Ti.109]

the piston rings bear,is :iade of ~ISI 440C material, in

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TARGET ROCK CORPORATION I' 4 GI 5 0 F 10 CKfCltlD IT *..*..........*.**.** !o------------------------f EAST FARMl:'-;GDALE LONG ISLAND, N. Y. 1111 1' 0 II T PaOJ&CT 3070 81CC accordance with TRC standard practice. A Stellite 6B sleeve was used in the test model because at the time the test valve was built, no AISI 440C sleeves for this size of valve were immediately available. ~he AISI 440C sleeves are presently being used in all Target Rock Corporation 1/2", 1" and 2" solenoid operated valves.

7. Pilot Exit Hole in the Main Disc: This has been enlarged in the region downstream of the pilot seat to reduce the possibility of this passage being blocked by crystals of dried boric acid.

Target Rock Corporation considers that the changes described above improve perfo:::mance and operability.

5.0 CONCLUSION

The Target Rock Corporation Model SOX-006 2 1/2" x 4" Power Operated Relief Valve tested by EPRI is representative of the Model BlCC valves to be installed at Consumers Power Company, Midland Plants 1 and 2. The minor variations which exist between these two models have primarily been made in response* to the test results generated by the EPRI tests at Marshall Steam Facility at Wyle Laboratories. They are fully described in Section 4 above.

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