ML20052B171
| ML20052B171 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/17/1982 |
| From: | Ehsan H, Kumar K, Sinha U GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20052B163 | List: |
| References | |
| NUDOCS 8204300113 | |
| Download: ML20052B171 (23) | |
Text
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REV. 1 APRIL 19, 1982 GRAND GULF MAIN STEAM ISOLATION VALVES i1PL# B21-F022 MPL# B21-F028 ADDITIONAL INFORMATION SUPPORTING JUSTIFICATION FOR INTERIM OPERATION
/-
PREPARED BY: GV tw ,
K. KUMAR M I " ' * *- U. N. SINHA APPROVED BY: ' #a&2_ //fuh9xE
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H. EHSAN E. 0, SWAIN i
i l GENERAL ELECTRIC l 175 CURTNER AVENUE l
SAN JOSE, CALIFORNIA 95125 l
APRIL 17,1982 8204300ll3 4
TABLE OF CONTENTS Page No.
- 1. Abstract 1
- 2. General Information 2
- 3. Dynamic Information 7
- 4. Tests and Analyses Supporting Operability 8 of Grand Gulf Main Steam Isolation Valves
- 5. Conclusions and Justifications 9
- 6. Figure 1 - Response Spectrum 10
- 7. Appendix I - Physical Comparison of Grand Gulf 11 and the Tested Upper Structure
- 8. Appendix II - Valve Assembly Drawings 14 l
1 L - _ _ _ . _ - . _ . _ _ _ _ _ , .
ABSTRACT The following tests and analyses have been performed on the Grand Gulf Main Steam Isolation Valves Upper Structure, or similar Upper Structures:
e Grand Gulf 28" Main Steam Isolation Valve Upper Structure has been compared with a dynamically tested 26" main steam isclation valve Upper Structure and it has been concluded that Grand Gulf Upper Structure is similar to the tested Upper Structure.
e Required Response Spectra have been developed for Grand Gulf at the base of valve cover. These response spectra have been com-pared with the test response spectra for the tested similar valve upper structure. The TRS envelope the RRS with margin.
e Static Bend tests have been performed on the Grand Gulf Main Steam Isolation Valve which assure valve operability under expected loads, e A special valve closure analysis demonstrates adequacy of structure during opening / closing of the valve.
It is therefore, concluded that the Grand Gulf Main Steam Isolation Valve Upper Structure is dynamically adequate to meet the expected loadings. Thus, use of this equipment during startup and operation of the Grand Gulf Station is justified until such time as the requalification is complete.
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GENERAL INFORMATION Main Steam Isolation Valves General Description The Main Steam Isolation Valve is of a quick closing design for high pressure steam service. It is a Wye pattern type valve complete with actuator and accessory equipment. The valve is actuated with an air cylinder operator (cir-to-open, air-and/or spring-to-close). The valves are usually installed in a horizontal main . steam line with two valves in series per main steam line, inboard valve. located within the drywell and the outboard valve located out-side the containment. The valve is designed for steam service. The 28" size has a capacity of 4,120,000# per hour with 06.6 psig maximum calculated pressure drop across the fully open valve. The base material is carbon steel., with a type'17-4PH stainless steel stem and a stellite guide bushing located in the cover. The body seating surface and guide ribs, the disc seating surfaces and the guide surface near the main seat and the cover back-seating surface are all faced with stellite. The body-to-bonnet joint is a bolted type con-l struction with a totally enclosed spiral wound stainless steel, asbestos filled gasket. The bonnet joint 'is prepared for seal welding, but seal weld-ing would be performed by others at the installation site if required. The stem seal stuffing 00x is ' equipped with two sets of packing. A lantern ring is located between the two sets of packing with a leakoff connection to the lantern ring in the fom of a socket welded pipe nipple. The body is equipped with provision for a 2" schedule 160 drain nipple located in the inlet end of
- the valve body. The valve is equipped with position switches to indicate open, closed and 94 percent open positions.
Operational Requirements NOTE: All part. nos, referred to are from dwg. 13561-01-H, Sheet I unless otherwise-noted.
The valve is to be capable of opening with a 200 psi differential pressure tend-l -ing to hold the valve closed, utilizing a minimum of 90 psig min. air pressure in i the cyclinder actuator. To accomplish this requirement and keep the cylinder size within reasonable limits a cylinder balancing arrangement in the form of a cup whose upper end extends into the valve body bonnet bore is employed. The poppet is equipped with an internal pilot' valve seat, and the end of the valve stem acts as the pilot valve poppet. When the valve stem lifts, the pressure in the balancing cylinder area decays, and thereby reduces the differential pres-sure acting over the main poppet area, thus reducing the operator force required to open the valve.
Tha valve is required to have an adjustable closing speed of three to ten seconds.
This requirement is accomplished by a tandem air and hydraulic cylinder (part no.
- 37) and 1" flow control valve (part no. 6 sheet 4 cf dwg.13561-01-H) installed in the external manifold mounted on the hydraulic section of the tandem cylinder (part-no. 37).
When closing the main steam isolation valve, the oil in the underside of the piston in the hydraulic cylinder must be displaced through the external manifold to the top side of the piston. The rate at which this oil displacement takes place is con-trolled by the adjustment of the 1" flow control valve (part no. 6 sheet 4 of dwg.
13561-01-H) which in turn controls the rate of valve closure.
Operational Requirements (Continued)
The closing speed control is provided with a minimum flow position to prevent full closure of the flow through the hydraulic cylinder's external piping.
The range of closing speed adjustment (3 to 10 seconds) is accomplished with not less than two full revolutions of the adjustment spindle of the 1" flow control valve (part no. 6 sheet 4 of dwg.13561-01-H).
Provisions are required to accomodate an increase in fluid pressure due to the increase of ambient temperature from that existing during filling and sealing of the hydraulic system to that existing during emergency conditions.
This requirement is satisfied by using a small accumulator (part no. 8 sheet 4 dwg. 13561-01-H) on the hydraulic cylinder external manifold. The accumu-lator is precharged with nitrogen at 100 psig, and has a design pressure limit of 5000 psig.
l The valve is to be capable of opening at the rate of one inch plus or minus one-half inch per second. The opening speed adjustment is accomplished by use of a 1/2" flow control valve (part no. 7 sheet 4 dwg. no.13561-01-H).
The valve operator is provided with an exercising control feature for stroking the valve from the 100% open position to the 94% open position. This require-ment is accomplished by installing a normally open 1 1/4" three-way valve (part no. 2 sheet 4 dwg. no. 13561-01-H) in the line between the connection to the underside of the air cylinder operator and the main four-way air control valve.
When the exercising control is energized, the under side of the pneumatic cylin-der is vente i and the springs (part no.15 & 16) will force the valve toward the closed position.
NOTE: The isolation valve is equipped with a position switch to indicate when the 94% open position has been reached. If the three-way exercising control is left in the energized position, the main steam isolation valve will go to the fully closed position.
The exercising speed is such that the valve shall be capable of stroking from 100% open to the fully closed position in 45 to 60 seconds. The exercising speed adjustment is accomplished by use of a 1/2" air metering valve (part no.
9 sheet 4 of dwg. no. 13561-01-H) installed in the exhaust port of the three-way exercising valve. The above time for full closing is not intended to imply that the valve is to be exercised to the fully closed position when the plant is in operation.
Operai.ional Description of the Pneumatic System Components (Dwg. 13561-01-H Sheet 4)
The air supply four-way to the pneumatic pilot operated operating) valve (part no. 1 which cylinder is on depending controlled by a 1 1/4" its position, applies air pressure to either the top or bottom end of the air cylinder oper-ator while alternately exhausting the opposite end of the cylinder. This 1 1/4" four-way pilot operated valve (part no. 1) in turn is controlled by a three-way normally energized 1/4" dual solenoid operated valve (part no. 4).
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Operational Description of the Pneumatic System Components (Continued)
To open the main steam isolation valve, either or both of the solenoids on the three-way main pilot control valve (part no. 4) are energized which feeds air pressure to the piston of the 1 1/4" four-way pilot operated valve (part no. 1) causing it to shift its position. The four-way pilot operated valve (part no.1) then feeds air pressure to the underside of the air oper-ating cylinder and at the same time exhausts air from the top end of the cylinder and the main steam isolation valve opens. Should either of the solenoids of the three-way main pilot control valve (part no. 4) be de-energized while the other is energized, the air pressure would be main-tained in the piston of the 1 1/4" four-way pilot operated valve (part no.
- 1) and it would maintain its position, thus the main steam isolation valve would remain in the open position.
In the event of loss of system air supply, the air pressure in the piston of the 1 1/4" four-way pilot operated valve (part no.1) would exhaust out through the three-way solenoid operated valve (part no. 4) to the air supply line. The 1 1/4" four-way pilot operated valve (part no.1) would shift its position and exhaust the air pressure from the underside of the operating cylinder. The force generated by the closing spring will close the main steam isolation valve, (any air pressure contained in the air storage tank will assist the spring in closing the valve).
To close the main steam isolation valve, both solenoids on the three-way main pilot control valve (part no. 4) are de-energized which exhausts the air pressure from the piston to the 1 1/4" four-way pilot operated valve (part no.1) causing it to shift its position. The 1 1/4" four-way pilot operated valve (part no. 1) then feeds air pressure to the top side of the air operating cylinder and at the same time exhausts the air from the bottom l
side of the operating cylinder and the main steam isolation valve closes.
It should be noted that in the event no air pressure is available for clos-ing, the closing springs will supply the force to close the main steam iso-lation valve.
A 11/4" nonnally open three-way pilot operated valve (part no. 2) is installed in the air line between the underside of the air operating cylinder and the main 1 1/4" four-way pilot operated valve (part no.1). Its purpose is to accomplish the exercising feature.
This 1 1/4" three-way pilot operated exercising valve (part no. 2) in turn is controlled by a three-way nonnally de-energized solenoid operated valve (part I no. 5).
To exercise the main steam isolation valve, the three-way solenoid operated valve (part no. 5) is energized which feeds air pressure to the piston of the 1 1/4" three-way pilot operated valve (part no. 2) causing it to shift its position. The air supply being fed from the main 1 1/4" four-way pilot oper-ated valve (part no.1) to the underside of the air cylinder is blocked and the air in the cylinder is exhausted to atmosphere through the 1 1/4" three-way pilot operated exercising valve (part no. 2). When the air pressure in the under-side of the air operating cylinder decays to a point where its force can no longer overcome the force generated by the closing springs, the 1__ . . - . - - - . -
Operational Description of the Pneumatic Systems Components (Continued) isolation valve will start to close. A 1/2" metering valve (part no. 9) in-stalled in the exhaust port of the 11/4" three-way pilot operating exercising valve (part no. 2) is used to adjust the rate of exercising speed. The exer-cising speed from 100 percent open to fully closed position, (14 inches of valve stroke), is 45 to 60 seconds. When the three-way solenoid operated valve (part no. 5) is de-energized, it exhausts the air pressure from the piston of the three-way pilot operated exercising valve (part no. 2) causing it to shift its position. The exhaust port is now blocked and the air from the main 1 1/4" four-way pilot operated valve (part no.1) is fed to the underside of the air cylinder operator and the main steam isolation valve returns to its full open position.
A 1 1/4" two-way pilot operated valve (part no. 3) is installed in a tee in the air line between the underside of the air operating cylinder and the 1 1/4" normally open three-way pilot operated exercising valve (part no. 2). This 1 1/4" two-way pilot operated valve (part no. 3) serves as an additional clos-ing valve in the air control system. The 1 1/4" two-way pilot operated valve (part no. 3) is controlled by the same dual solenoid operated three-way valve (part no. 4) that controls the main 1 1/4" four-way pilot operated valve (part no. 1). When the three-way dual solenoid operated valve (part no. 4) is ener-gized to open the main steam isolation valve, air pressure is also fed to the piston of the 1 1/4" two-way pilot operated valve (part no. 3) which shifts its position. The valve closes, blocking the exhaust port and prevents the air pressure in the line to the underside of the air operating cylinder from exhausting to atmosphere.
When the dual solenoids of the main three-way pilot operated valve (part no.
- 4) are de-energized to close the main steam isolation valve, the air pressure is exhausted from the piston of the 1 1/4" two-way pilot operated valve (part no. 3) causing it to shift its position. The air in the underside of the air cylinder operator is then exhausted to atmosphere through the open 1 1/4" two-way pilot operated valve (part no. 3) as well as through the main 1 1/4" four-way pilot operated valve (part no.1).
Hydraulic Speed Control System The purpose of the hydraulic speed control system is to control the opening and closing speed of the pneumatic cylinder operator on the main steam isola-tion valve. The sub-plate mounted hydraulic speed control system is connected to the speed control cylinder at the top and bottom ports. By the use of ad-justable flow control valves in the sub-plate assembly, the amount of flow from one side of the hydraulic cylinder piston to the other can be regulated.
This regulated flow controls the operator cylinder opening and closing speed.
Operational Description of the Hydraulic System Components Part Nos. From Dwg. 13561-01-H Sheet 4 A 1" closing flow control valve (part no. 6) (adjustable and pressure com-pensated), is sized so that the time to fully stroke the pneumatic operator is less than 3 seconds when only spring force is applied in the closing direction.
Operational Description of the Hydraulic System Components (Continued)
It is also capable of adjusting the closing time to 10 or more seconds when both air pressure and spring loads are applied in closing direction. The range of closing speed adjustment, (3 to 10 seconds) is accomplished with not less than two full revolutions of the adjustment spindle. The closing flow contml valve (part no. 6) is equipped with a minimum flow position to pre-vent its full closure. The minimum flow position is sized so that the time of full pneumatic operator stroke is greater than 10 seconds in order to achieve the adjustable closure range of 3 to 10 seconds. The adjustable spindle of the closing flow control valve (part no. 6) is provided with a positive locking device.
A 1/2" opening flow control valve (part no. 7), (adjustable and pressure com-pensated), is sized so that the time to fully stroke the pneumatic actuator (retract piston rod from fully extended position), is at a rate of 1 inch, plus or minus 1/2 inch pei second. The opening flow control valve (part no.
- 7) is equipped with a minimum flow position to prevent its full closure. The minimum flow position is sized so that the time of full operator stroke is less than 1/2" per second in order to achieve the adjustable opening range of 1/2" to 1 1/2" per second. The adjustable spindle of the opening flow control valve (part no. 7) is provided with a positive locking device.
The accumulator is included in the hydraulic system in order to accomodate an increase in fluid pressure due to the increase of ambient temperature from that existing during filling and sealing of the hydraulic system to that exist-ing during emergency ambient conditions.
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DYNAMIC INFORMATION The required response spectra (RRS) used in this evaluation for the Grand Gulf MSIV Upper Structure are based on the following observations:
a) The main steam isolation valve (MSIV) is mounted on the piping which is supported by the main steam guide and the head fitting. The main steam guide, in turn, is mounted on the platform near the drywell wall, and the head fitting is mounted in the shield building wall.
b) The support system and valve body are stiff so that the loads (response spectra) input to the MSIV upper structure can be considered the same as obtained from the building model.
Based on the above observations, it can be shown that in the vicinity of the main steam isolation valves (MSIV), the controlling dynamic loads as detemined by the piping dynamic analysis are the combination of safe shutdown earthquake (SSE) plus the safety relief valve blowdown structural load (SRV). Grand Gulf unique enveloped (SSE + SRV) response spectra, hereafter called the required response spectra (RRS), have been developed to compare with the test response spectra (TRS) used on the tests of similar valve upper structures. Based on the comparison of RRS and TRS, the following conclusions can be made:
- 1. Grand Gulf Project Unique Response Spectra show 29 ZPA loading on the MSIV, whereas the test response spectra used for testing the 24 inch and 26 inch MSIV upper structures used ZPA of 5.5g.
- 2. Test response spectra used for testing the MSIV upper structures were broad band in comparison with narrow band real input motion l to Grand Gulf MSIV. So, it can be seen that TRS provide conser-vatively higher load than the required load (RRS).
- 3. The natural frequency of the Grand Gulf Upper Structure is about 28 Hz. The natural frequencies of the tested MSIV Upper Struc-tures were between 10 Hz and 14 Hz. Since the tests were per-formed from 2 Hz to 40 Hz, excitation of the upper structure at the natural frequency is assured.
- 4. Comparison of different components of Grand Gulf MSIV Upper Structure and the tested MSIV Upper Structure have been made (Appendix I). The comparison shows that the Grand Gulf MSIV Upper Structure is physically similar to the tested upper structure and generally made out of better material.
Based on the above infomation, it can be concluded that the TRS used for testing I the 24 inch and 26 inch MSIV upper structures envelop the Grand Gulf Unique Required Response Spectra (RRS) (See Fig.1) and that comparison of these spectra is justified based on similarity of the valve upper structures.
7-i
TESTS AND ANALYSES SUPPORTING OPERABILITY OF GRAND GULF MAIN STEAM ISOLATION VALVES Operability of the Grand Gulf Main Steam Isolation Valve is based on the following infonnation:
- 1. A Static Bend Test was performed on the Grand Gulf Valve which demonstrated that the valve would close within the required time period of 4.0 + 1 seconds.
The valve was exercised using air and springs, while the valve was being subjected to a static equivalent seismic load. In this test, the stem moved freely without any scratches or binding when a load of 18,550 lbs (approxi-mately 5.6 g) was applied at the spring top plate. On the Grand Gulf valve, the maximum expected dynamic load is approximately 6.6 g's applied at the center of gravity of the upper structure. Calculating moments, the static bend test imposed a moment of approximately 945,663 in-lbs at the valve body /
bonnet centerline. The comparable maximum expected dynamic moment is approxi-mately 752,043 in-lbs. The static bend test therefore bounds the expected dynamic moment.
- 2. A special " Closure Analysis" was performed on the Grand Gulf 28" Main Steam Isolation Valves. This analysis was done to assure that the air pressure in the pneumatic cylinder and the springs are more than adequate to open/
close the valve under the Grand Gulf specified flow conditions.
- 3. Upper Structures of two main steam isolation valves similar to the Grand Gulf Main Steam Isolation Valve have been previously tested. The Test Response Spectra of the tested Upper Structures envelope the Required Response Spectra of the Grand Gulf Upper Structure (See Figure 1), Operability of the Upper Structure was demonstrated during and after the seismic test.
CONCLUSIONS AND JUSTIFICATIONS Grand Gulf Main Steam Isolation Valves were supplied by Atwood and Morrill Valve Co. using Sheffer/ Hiller SA-A039 pneumatic and hydraulic components.
These valves remain in open position all the time during nomal plant oper-ation and are checked periodically for their closure capability. The Upper Structure of a similar 26" valve was tested and operated successfully during and after the test under simulated seismic loadings. The Test Response Spec-tra for the similar 26" valve Upper Structure envelopes the Grand Gulf Required Response Spectra. Grand Gulf Main Steam Isolation Valve Upper Structure is very similar to the tested Upper Structure (Refer to Appendix-I for detailed comparison). The Required Response Spectra for Grand Gulf is enveloped by the Test Response Spectra with substantial Margin. (See Figure 1 ). Based on the similarity of the tested Upper Structure and the Grand Gulf Upper Struc-ture it is anticipated that the Grand Gulf Upper Structure would respond in a similar manner when dynamically tested. It is expected that the relative stress level in the Yoke Rods would be lower due to the use of superior yoke rod material and size which provides additional assurance of Upper Structure's seismic capability. Furthemore, successful " Static Bend Test" and " Closure Analyses" have been performed.
It is, therefore, concluded that the Grand Gulf Upper Structure is dynamically adequate to meet the expected loadings. Thus startup and operation of Grand Gulf Station is justified until such time as requalification is completed.
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RESPONSE SPECTRUM 1.ONGT. IN PilASE 11/15/77 POST TEST # OF PUI.SES AT 0 DB = 3 s
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0 Appendix I PHYSICAL COMPARISON OF GRAND GULF AND THE TESTED UPPER STRUCTURE l
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APPENDIX I - PHYSICAL COMPARIS0N OF GRAND GULF AND THE TESTED UPPER STRUCTURE (Actuator Only) 24" - Tested Upper Grand Gulf Structure Item Description Upper Structure Report No. NEDE-24122-2 Pneumatic / Hydraulic Component Vendor Sheffer/ Hiller Sheffer/ Hiller Component Model No. SA-A039 SA-A012 Dual Solenoid Supplier /Model No. ASC0/HTX832320 ASC0/HTX832320 Single Solenoid Supplier /Model No. ASC0/HTX8320A20 ASC0/HTX8320A20 2-Way Valve Supplier /Model No. Norgren B0004A Norgren/B-1026B-00-Al Similar to B0004A 3-Way Valve _ Supplier /Model No. Norgren/C0007A Norgren/C-1037B-00A1 Similar to C0007A 4-Way Valve Supplier /Model No. Norgren/F013A Norgren F2227B-00-Al Similar to F013A 0-Rings Viton Viton Pneumatic Cylinder Height 24 1/8" 27 1/2" Pneumatic Cylinder Bore Dia. 20" 20" Piston Diameter 3" 3" Stroke Length 15" 18" Operating Pressure 90 - 125 PSI 90 - 125 PSI _
Hydraulic Cylinder Bore Dia. 5" 5" Piston Diameter 3" 3" Hydraulic Fluid GE Silicone- Shell Irus - 902 SF-1147 7 - - --......
APPENDIX I - PHYSICAL COMPARISON OF GRAND GULF AND THE TESTED UPPER STRUCTURE (Yoke Components Only) 26" - Tested Upper Grand Gulf Structure Item Description Upper Structure Report No. NEDE-24122-1 Valve Vendor A&M A&M Valve Size 28" 26" Bonnet Cover Plate Dia. 35 5/8" 33 7/8" Bonnet Cover Plate Thickness 5 5/8" 5 3/8" Bonnet Cover Plate Material SA-105 SA-105 Body Bonnet Bot diameter 2 2" Number of Body Bonnet bolts 18 20 Yoke Rod Material AISI - 4140 AISI - 1018 Yoke Rod Diameter 4.5" 3" Yoke Rod Length 57 3/4" 34 1/4" Tested Yoke Rod Stress - 20,000 PSI Yoke Rod Yield Stress 103,000 PSI 48000 PSI Outside Springs Spring Wire Diameter 25/32" 23/32" Spring Coil Outside Diameter 7 3/4" 6 1/4" Boxed load (Valve Closed) 1412 lbs 1150 lbs Boxed load (Valve Open 2524 lbs 2346 lbs Inside Springs Spring Wire Diameter 9/16" 17/3?'
Spring Coil Outside Diameter 6" 4 5/8" Boxed load (Valve Closed) 712 lbs 618 lbs Boxed load (Valve Open) 1220 lbs 1260 lbs General Overall Upper Structure Height Approx. 90" Approx. 85.50" Overall Upper Structure C.G. 39.56" 33.81" Overall Upper Structure Weight 5860 lbs 4597 lbs including cover.
Stem Travel Nominal 14" 13" Limit Switches NAMC0 EA-740 NAMC0 EA-740 Stem Diameter 2" 2"
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Appendix II VALVE ASSEN LY DRAWINGS
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ATTACHMENT NO. 2 HPCS Valve Actuators E22-F001/F004/F010/F011/F012/F015/F023 .
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.a JUSTIFICATION FOR INTERIM OPERATION FOR HPCS VALVES E22-F001/ l
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l F004/F010/F0ll/F012/F015/F023 (SEISMIC QUALIFICATION) )
REFERENCES:
- 1) Limitorque Seismic Qualification Report #B0037
- 2) Limitorque Seismic Test Report #B0085
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Interim operation of the Limitorque actuators is justified based on the following:
- 1. Limitorque ran series of seismic tests (see Reference l above) on the .
family of their actuators from a small unit (SMB-000-5) to the largest unit (SMB-5). The general construction of these units is similar, and were enveloped by the series of seismic. tests.
- 2. The control box, housing the torque and limit switches is the same size and ccnstruction for all the different sized actuators.
- 3. The actuators were operated before, during and after the seismic test with simulated valve load on the actuator for operability demonstration (see Figure 2 and Section 2.0.2 of Reference 1).
- 4. The tests as indicated in Reference 1 state that there are no resonances below 33 Hz. One actuator SMB-5 had a broad resonant peak at 28.8 Hz with a gain of 2.5 in the lateral axis and sine dwell test was conducted' at this frequency (Appendix 12 of Reference 1). All other actuators were tested at 33 Hz to a level of 6 g's.
Based on the above and the Reference 1, the actuator models are qualified for seismic excitation up to 33 Hz and 6 g's by the following Apoendices:
Report Actuator Model Appendix SMB-00-15 (E22-F001 ) 6 SB-3-100 (E22-F004) 5 SMB-4-200 (E22-F010/F0ll) 12 SB-0-24 (E22-F012) 4 SB-1-40 (E22-F015) 2 SMB-4-150 (E22-F023) 12
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at CONCLUSION:
The demonstrated capability of the actuators exceed the piping calculated accelerations and therefore the interim -use is justified. This conclusion is augmented by the fact that the backup ADS, LPCI and LPCS systems could provide emergency cooling water if required.
JUSTIFICATION FOR INTERIM USE FOR E22-F004 (ADDITIONAL TO THE AB0VE JUSTIFICATION)
Actuator SB-3-100 mounted on the valve E22-F004 has a motor brake installed. An 4, actuator with motor brake has never been seismically tested before. However,
' it is increased by 40 lbs (size 8" in diameter by 3" in height). This is approximately 3% of the actuator weight (1200 lbs). Because the difference in weights is insignificant, it is concluded that the seismic qualification for other HPCS valve actuators be applied to E22-F004 This conclusion is augmented by the fact that the backup ADS, LPCI and LPCS systems could provide emergency cooling water if required.
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ATTACIDfENT NO. 3 IIPCS Diesel Generator Systems
, E22-S001/S002/S003/S004 AE2Z3
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