ML20209B511
| ML20209B511 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/22/1987 |
| From: | TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML20209B501 | List: |
| References | |
| 1357, NUDOCS 8704280455 | |
| Download: ML20209B511 (183) | |
Text
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! Dockst No. 50-346 License No. NPF-3 l Serial No. 1357 Attachment l
SUMMARY
REPORT FOR THE DAVIS-BESSE MOTOR OPERATED i VALVE RELIABILITY PROGRAM LIST OF ATTACHMENTS j Attachment 1 - Program Summary Report i
. Attachment 2 - Summary of Motor Operated Valve Problems by cause i
j Attachment 3_- Valves Inoperable "As Found" l
' Attachment 4 - Valves with Significant Problems i
) Attachment 5 - Valve Problem Summary Report :
1 Attachment 6 - Differential Pressure Test Summary f
Attachment 7 - Flow Test Results 4
Attachment 8 - FW601 and FW612 Design Change Attachment 9 - Unbalanced Torque Switch 10CFR21 Report to NRC i
O Attachment 10 - Action Plan 12 i
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i 4
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!O HOV REPORT l
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i i 8704280455 B70422 i
Docket No. 50-346 License No. NPF-3 Serial No. 1357 V Attachment ATTACHMENT 1 PROGRAM
SUMMARY
REPORT DAVIS-BESSE MOTOR-0PERATED VALVE RELIABILITY IMPROVEMENT PROGRAM
' JUNE 9, 1985 - DECEMBER 20, 1986 Prepared by:
P. N. Carr J. W. Long R. C. Elfstrom 1
1 O
Attachment 1 Page 1 O
V I. INTRODUCTION AND BACKGROUND TO THE PROGRAM During the June 9, 1985 reactor trip, Auxiliary Feedwater (AFW) to Steam Generator (SG) motor operated isolation valves, AF 599 and AF 608, closed on a demand from the Steam Feedwater Rupture Control System (SFRCS).
However, when the SFRCS was reset, both valves failed to re-open on demand. The cause of the failure of the motor operated valves to re-open against differential pressure was determined to be an improperly adjusted torque switch bypass limit switch and improper setpoint for the close-to-open torque switch. This finding was based upon actual tests following the plant transient. An action plan' (Plan #12), attachment (10), was formulated to confirm these findings and also to determine any other possible cause which may have cont-ributed to the failure of the valves to re-open. This plan was sub-sequently modified to include testing of all MOVs important to the safe operation of Davis-Besse. This plan meets the intent of IEB 85-03 for all of these valves.
Extending the action plan, Toledo Edison has implemented the Davis-Besse Motor-Operated Valve Reliability and Improvement Program. This O
V program is an extensive effort to ensure reliability and performance of the 165 MOVs considered important to the safe operation of Davis-Besse. This program includes the following activities:
A. Refurbishment, upgrade and inspection of the MOVs to ensure reliability and performance. This included removal of space heaters and non-environmentally qualified wire from the control circuits, proper lubrication and assembly procedures, installa-tion of needed drains, and Engineering review of control circuit design.
B. Determination of limiting MOV differential pressure and flow and the corresponding opening and closing valve-stem thrusts based on standard stem thrurt calculations. This activity included analysis and evaluation of the systems in which the MOVs are installed to determine credible operating conditions, discussions with the valve and actuator vendors to verify design and nameplate data and establish required opening and closing stem thrusts, and establishment of maximum limits on stem thrust to preclude damage of valve and/or actuator components.
C. Upgrading the preventive and corrective maintenance programs and procedures, establishing a training and qualification program for personnel working on Limitorque Operators, and initiating the implementation of a predictive maintenance program through valve reliability trending.
v D. Education of appropriate Engineering and Craft personnel in valve / operator theory and operation in order to develop more effective root cause determinations.
Attachment 1 Page 2 f3 U
E. M0V testing using the Motor-Operated Valve Analysis and Test System (M0 VATS) equipment to ensure that torque switches are set to provide MOV stem thrusts greater than that required under design basis conditions but less than that which could damage valve and/or actuator components. For gate and globe valves, the torque switch setpoints are bypassed for the first 20(+5/-0)%
of valve disc travel in the open direction to ensure valve opening.
F. MOV testing has included the 165 MOVs under zero differential pressure conditions and 26 MOVs under a pre-established static differential pressure conditions. The static differential pressure tests have demonstrated that the MOVs are capable of opening under design differential pressure conditions of I.B above. The 26 MOVs tested are a representative sample of the 165 MOVs considered important to the safe operation of Davis-Besse.
G. Testing also included full-flow differential pressure tests
. which demonstrated that the MOVs are capable of opening and closing under design conditions simulated using process pumps.
A sample of 8 MOVs was selected for full-flow differen'.ial pressure testing. The sample size was limited because establish-ment of full-flow, design conditions is complex and limited to
' only a few system lineups, and because the purpose of the full-flow test is to demonstrate that static differential pressure tests are adequate to obtain information necessary to ensure valve function.
II. PRINCIPLES OF OPERATION AND TESTING OF MOTOR-OPERATED VALVES A. To clarify the technical discussions which follow, a brief explanation of the principles of operation of a Limitorque Motor Operator and the basics of MOVATS test equipment is necessary.
B. Basic Principle of Operation of Motor Actuator Referring to Figure 1, the motor rotates the worm through a gear train. The worm gear rotates the stem nut, which raises or lowers the threaded valve stem. When the worm gear can no longer turn (valve closed, open, or obstructed) the worm then moves axially along its splined shaft compressing a Belleville spring pack. This axial movement operates the torque switch and stops the motor. The torque setting is related directly to the amount of spring pack compression. When the motor is reversed, a loss of motion must be taken up until the worm gear lugs engage the stem nut. This motion permits the motor to reach full speed while unloaded and then apply a hammer blow to the valve stem to unseat the valve. The limit switch assembly is n directly driven by the gear train and can be adjusted to operate at any point of valve travel.
b) l 1
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Attcchm:nt 1 Page 3 QJ L Switch Assembly \ _ Torque
" Switenes h
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' " Worm
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a ~ ........ ... .._W)9*8 earing W) : Blllllllllllllll Gear Motor Train h Sphnec Shaf t o
Worm Gear Valve Stem t.ugS to Stem Nut Rotate Stein Nut Q(3 FIGURE 1 The torque switch on a wedge or torque seated valve in closing controls the amount of thrust or force that is used to seat the valve. This thrust must be sufficient to close the valve against the fluid differential pressure that exists and seat the valve to produce a leak tight seal. The thrust must also be kept below a value which can cause damage to the valve, the operators mechanical, or electrical components. The switch must open to stop and protect the motor at a thrust (torque) value lower than the stall value.
Davis-Besse has established the policy for torque seated valves, that in the opening stroke the torque switch is bypassed for the first 20% to 25% of travel to insure that the operator's torque switch is not actuated and thus prevent the valve from opening (see Figure 2). Typically, a high torque is required for 50 to 2000 milliseconds, after which torque requirements to continue opening the valve drop by 60% to 80%. The torque switch is then placed back into the control circuit to protect the operator and valve against damage due to excessive thrust or motor stall. There is however, a potentially serious drawback to the increasing of the torque switch bypass by simple adjustment of the Limit Switch
/] Rotor trip point. This is due to the fact that in most normal V wiring configurations, the rotor that contains the torque switch bypass contact. also is used for valve " closed" indication lights.
Therefore when the bypass is set to trip at 20% of valve travel in
Attachment 1 Page 4 l
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! the "open" direction, the tripping of this same rotor when the valve is closed will give closed indication after 80% of stroke,
! or still 20% from fully closed. This becomes doubly significant in the case of "non-seal-in" circuits such as those used in throttle valves, where the error in closed indication can affect plant operation such as indicated in the INPO Significant Event i Report 12-86. The positive elimination of the conflicting requirements imposed by the closed indication versus the torque switch bypass can be achieved by using four rotor limit switches and relocating the closed indication to a rotor that can be set to accurately indicate valve position. It is also necessary to closely evaluate any interlock function which may also be j affected by the increase of the torque switch bypass setting.
The torque switch (except for double seating valves) does not j stop the valve travel in the opening direction. This is done by 4 the limit switch and as such acts to prevent damage to the
,l valve's back seat.
i By performing maintenance on the operator and/or valve the relationship of thrust produced by a particular torque switch i setting can be changed. If the spring pack is changed, any variation in the spring constant (K) can produce a setpoint j- change. Balance of the torque switch can be critical since the 1 setpoint of the torque switch assumes that equal displacement in either direction will result in a trip at the same thrust value.
With the torque switch unbalanced however, torgue switch trip l may occur prior to the required distance of compression to produce the desired thrust, or the actual required travel may a result in 2 to 3 times the expected thrust. This has the 1 potential of Insufficient thrust being delivered to close the
- valve or excessive thrust being applied exceeding manufacturer's i design limits. Relubrication of the valve operator or repacking I of the valve can also affect this relationship. Prior to
- development of test equipment which directly measures the l thrust, calculative methods were the only way known to Toledo a Edison of establishing the valve setup. These calculations were 1 subject to various assumptions. However, we are now able to measure the actual thrust produced, removing any inaccuracies produced by the design assumptions. Thus the torque switch can be accurately adjusted following certain' maintenance activities l to maintain the stem thrust requirements for proper valve i operation, i
! Figures 3 and 4 are " exploded" views of typical limitorque i operators showing the major components.
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Attcchment 1 Page 5
' %J ht A simplified electrical schematic showing the torque switch bypass contact is shown below:
OPEN Torque Switch
- a -
Power Torque Switch Motor Supply Bypass Contacts CLOSE Torque Switch FIGURE 2 C. Basic Operation of Movats Test Equipment With a basic understanding of the operation of a Motor Operated Valve (MOV) the operating principles of MOVATS' Signature Analysis Process can now be explained. There are three signature traces which were utilized the most at Davis-Besse in setting up and testing MOVs.
These are a stem thrust signature, control switch signature, and current signature. Each of these signatures is described below.
- 1. STEM THRUST SIGNATURE The basis for the MOVATS stem thrust signature is the concept that the greater the load being delivered to the valve stem, the greater the movement of the worm within the operator itself.
Therefore, if one could monitor accurately this movement, and correlate or calibrate this movement to actual stem load throughout a valve cycle, a dynamic measurement for the stem thrust load would be the result.
To obtain this parameter, a linear variable differential trans-former is installed in a device called the " Thrust Measuring Device" (TMD). To install the TMD on the motor operator, the spring pack dust cover is removed and the TMD mounted such that its plunger comes in contact with any part of the spring pack pre-load nut. With the TMD now installed and its conditioned output connected to the recording system, any subsequent move-Os ment of the spring pack or worm, which is reflective of the stem load, will be translated into a voltage output of the TMD. This movement of the spring pack can further be correlated to actual stem thrust.
l l Attechnent 1 Page 6 ,
i In order to " calibrate" the spring pack movement on Limitorque type of operator to actual stem thrust, a calibrated load cell is mounted such that it is within close proximity of the valve r stem. With the TMD installed and monitoring spring pack position, ,
and the load cell output likewise connected to the portable two !
channel digital recording oscilloscope, the valve is opened electrically. As the valve stem contacts the load cell, the stem load rises with a corresponding spring pack movement. The spring pack movement signature can now be directly correlated to j the actual 1,ad signature. The resultant curve has a definite i slope which is referred to as the K-factor of the spring pack and is represented in terms of pounds of stem thrust per inch of spring pack deflection. In the analysis of NOVATS signatures it has proven to be more helpful to express the K-factor as pounds ;
of stem thrust per volt of THD output.
Knowing the K-factor now allows the user to determine the actual magnitude of the load being delivered to the valve stem at any time during the valve cycle.
- 2. CONTROL SWITCH SIGNATURE Actual field testing has shown that having the capability to O determine the exact time and loading condition at which the control switches actuate is of paramount importance. This sub-system provides a single signature, simultaneously superim-posed on the thrust signature, which reflects the exact point and loading condition, within the valve cycle, at which the various switches actuate.
- 3. MOTOR CURRENT SIGNATURE In measuring this parameter dynamically, a 12% accuracy Simpson
" clamp-on" ammeter, with analog output, is utilized. This ;
particular parameter can be obtained either at the valve or the motor control center. Changes in motor current signatures, although not as responsive as the TMD, can provide periodic indication of grossly degrading mechanical or electrical MOV degradation. Using motor current measurements alone is difficult i
at best, although knowledge of the fact that a changing condition 1 does exist is extremely valuable. However, when this parameter is monitored in conjunction with the voltage sensing method for i switch actuations from the MCC, typical MOV degradations can be identified, i i
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Attachment 1 Page 7 O
FIGURE 3 LIMITORQUE OPERATOR SMB-000
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FIGURE 4, LIMITORQUE OPERATOR SMB-0 TO SMB-4 &SMB-4T o
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Attechment 1 Page 9 A
U III.
SUMMARY
OF AS FOUND VALVE CONDITIONS The implementation of the MOV Reliability Improvement Program resulted in processing a total of 2221 work orders. Of the 165 safety related and important to safety classification of valves in the program, the as found condition is as follows:
- 17 MOVs were evaluated as " inoperable" in that they would not have opened or closed against the design differential pressure. Three of these valves are passive and have no
. safety function. Four of these valve problems were associated f
with the valve and not the operator although the operator may have contributed to the failure. Inoperability of' these valves has been reported under LER 86-015.
- 58 MOVs were evaluated as having significant problems, "as found", these valves however would probably have operated correctly.
- 90 MOVs were evaluated as having no major problems.
Further, the above problems were classified by the type. NOTE: Some valves have more than one problem. The most prevalent problems are as O follows:
Mechanical:
- 56 MOVs required re-lubrication. One (1) was inoperable for this reason.
- 24 MOVs required repairs to the Manual Operator /Declutch mechanism.
- 13 MOVs required repair or replacement of spring pack parts.
- 12 MOVs had valve mechanical problems or required repacking.
Four (4) were inoperable due to this condition.
Electrical:
- 137 MOVs were not wired in accordance with drawings. All were schematically and functionally correct. Problems were that leads and jumpers were not terminated per the drawings.
- 102 MOVs had wire replaced to insure EQ qualification. The identification to the manufacturer was missing for most of these. This was reported to the NRC under LER 86-006 Rev 1.
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Att:chment 1 Page 10 (V
- 34 MOVs had unbalanced torque switches. Three (3) were inoperable due to this condition. The torque switches were balanced and this condition was reported to the NRC under 10CFR21. See Attachment 9.
- 27 MOVs had wire lugs replaced due to damaged insulation or loose crimps.
- 25 MOVs had torque switches replaced. Four (4) were inoperable due to this condition.
- 17 MOVs had limit switches replaced. One (1) was inoperable due to this condition.
Design:
- 24 MOVs had design related problems. Two (2) were considered inoperable in the closing direction due to identification of an erroneous design differential pressure. This was reported in LER 85-015.
Seitch Settings:
- 26 MOVs had incorrect bypass limit switch settings. Two (2) were inoperable due in part to this condition. This was reported in LER 85-015.
- 11 MW0s had incorrectly set limit switches for positioning of the valves. This problem is related to butterfly valves, ball valves and dampers.
Attachments 2, 3, 4 and 5 are reports from a computerized data base summarizing the above noted problems in more detail. Use of a computer-ized data base has allowed quick access to valve design data and history.
It has also proved to be a good source to highlight generic problems as i~s noted in this report. Toledo Edison's Engineering Division also assembled a complete hard copy file of valve and operator maintenance and design data which has proved to be very valuable.
Several design changes were made to resolve problems found during initial inspections. They are briefly described in the following paragraphs.
- 1) The Main Feedwater isolation valves FW 601 and FW 612, 18" Velan Gate Valves with a required closing time of 14 seconds were found to have damaged disc seats. The combination of a high speed limitorque operator and starter drop-out time, caused an increase in final thrust of 300%
greater than thrust at torque switch trip. This final thrust was 100%
above the manufacturers failure value and resulted in cracking of the stellite seating surfaces on the disc.
O
Attachment 1 Page 11 I
Toledo Edison resolved this problem by using the limit switch to stop the motor and allowing the disc to " coast" into the seat. FCR 86-0198 (Attachment 8), details how this was accomplished. The modification resulted in allowing the valve to close at its high rate of speed and consistently seat at a thrust value high enough to be leak tight without incurring seat damage.
- 2) Two Grinnell type diaphragm valves CV 5010E and CV 5011E were found with damage to stems and diaphragms due to oversized operators. FCR 86-0032 was issued to change these from torque seated to position limit seated.
The hand wheel size was also reduced to prevent inadvertent damage during manual operation.
- 3) As part of the Environmental Qualification program, FCR 85-0344 was issued inspect all the EQ limitorque operators and to add the EQ wire designations to the design connection diagrams.
- 4) One double seated valve, MU 11 a three way valve in the RCS letdown system downstream of the purification demineralizer, was found to be position limit controlled in the open direction. This allowed some leakage past the valve and thus was an operational problem. Since the valve was designed to seat in both directions, its control was changed by FCR 85-0302 to be torque seated in both open and closed positions.
- 5) Four dampers in the emergency ventilation system were found to be shutting off by torquing out instead of utilizing the position limit switches. The dampers were torquing out against the HBC gearbox stops. The control method was changed in FCR 85-0295 to position limit switch control.
- 6) One additional valve FW 5867 was modified to shut using the limit switch.
This is a 6" Globe Valve used to control flow from the newly installed Motor Driven Feed Pump. It was found that the operator was oversized and could damage the valve if torque control were used. It is not needed for isolation, thus the control scheme was modified to stop the valve just i short of the seat with the limit switch. Further system modification !
during the next refueling outage will correct this design problem. !
i
- 7) As a part of the program to ensure the establishment of the proper design control of MOV switch settings, FCR 85-0277 was issued. This FCR incorporated the required torque switch bypass contact setting on the elementary diagram for each affected MOV control circuit.
IV. STATIC DIFFERENTIAL PRESSURE TESTING Static differential pressure testing of representative valves was conducted to verify that the forces necessary to operate the valves were as predicted by the formulas and settings furnished by the manufacturer. The valves were cycled opened, closed electrically and
/* left closed. One side of the valve was then pressurized with a hydrostatic test pump to the test pressure and the valve then opened.
A set of MOVATS traces was recorded and the opening forces were compared with the calculated requirements.
Attechment 1 Page 12 O
V. EVALUATION OF DIFFERENTIAL PRESSURE TESTING RESULTS The static differential pressure testing conducted on the 26 MOVs indicated that in most cases the thrusts measured after commencement of valve disc movement are conservatively predicted by the formulas used by the manufacturer to set the torque switches. These forces can be seen in and measured from the MOVATS thrust signatures even though the hydrostatic pressures quickly dissipate once a small flow path past the valve disc is established.
The standard vendor formula used for wedge type gate valves used at Davis-Besse is:
+
Stem Thrust = [ Orifice Area x Seat Factor x Differential Pressure]
[Line Pressure x Stem Area] +
[ Packing Friction Load) or Thrust = [0A X SF X DP] + [P X SA) + PF where the seat factor (SF) = (.3) From Vendor orifice area (OA) = ( ) From Vendor
/~N stem area (SA) = ( ) From Vendor
\s differential pressure (DP) = ( ) From Calculations packing friction (PF) = Stem dia in inches x 1000 or 1000 whichever is greater line pressure (P) = Maximum system pressure The thrust values for both opening and closing were assumed to be the same even though the pressure forces on the stem (the piston effect) helps to open the valve, reducing the thrust in that direction. Also Toledo Edison set the open torque switches to the manufacturers recommended maximum setting. This gives the greatest confidence that
- the valve will open without reducing the protective function of the torque switch to protect the valve, operator and motor from damage should it be stalled for some reason. In addition, data contained from full flow testing was incorporated in the final thrust valves chosen to provide an added measure of confidence based on this testing.
For three valves it was found that the opening static differential pressure testing measured thrusts were greater.than those the formula would predict, as noted in the full flow testing of AF 599 and AF 608 and discussed in Section VII. This increased thrust was also seen in that data. For DH 830 this was also noted but it was not possible to flow test this valve.
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- ( } A listing of the valves tested, the design and testing conditions is l
contained in Attachment (5).
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Attechm:nt 1 Page 13 G
VI. FULL FLOW TESTING OF MOV CLOSURE Testing also included full-flow differential pressure tests which were intended to demonstrate that the MOVs are capable of opening and closing under limiting conditions simulated using process pumps. As an explanation of the term " full-flow", the only way to achieve a differential pressure when testing a valve in the closed direction is to have a flow source of approximately the same pressure and rate as the design condition to be verified. A sample of 8 MOVs were selected for full-flow differential pressure testing.
The sample size was limited because establishment of full-flow, design conditions is complex and limited to only a few system line-ups, and because the purpose of the full-flow test is to demonstrate that static differential pressure tests are adequate to ensure valve function.
VII. RESULTS OF FULL-FLOW MOV CLOSURE TESTS A. The evaluation of the full-flow test results indicate that under the design differential pressure conditions the required stem thrust is normally predicted by the standard vendor formula.
i However two of the eight valves tested did have higher than
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s- cxpected thrusts. These higher than expected closing forces encountered under full flow conditions are evident from an examination of the static differential pressure testing. The test summaries for the following valves are included in Attachments (6 and 7).
B. MOVs AF 599 and AF 608 were tested under full-flow conditions with the closing torque switch setpoint as determined by the standard stem thrust calculations. MOV AF 599 completed most of its travel but tripped out upon reaching the close torque switch setpoint prior to full closure. It is estimated that when the valve tripped, the valve had shut off about 96% of the initial full flow and completed about 92% of its travel. MOV AF 608 succeeded in closing off flow but tripped upon reaching the close torque switch setpoint before it was fully seated. Retest of MOVs AF 599 and AF 608 in TP 851.49 and TP 851.50, indicate that valve stem thrusts of 61% and 40%, above the standard calculations respectively, are required for closure of these MOVs under design differential pressure. A new torque switch setting was established from this testing data which assures that the valves will close under the design differential pressure and flow.
MOVs AF 599 and AF 608 are 6-inch, 600-pound class Velan gate valves with 10-second closing time Limitorque operators. The
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full-flow dP tests were run using the newly installed motor-driven feedwater pump (MDFP) with an initial flow to the steam generators at atmospheric pressure of approximately 1000 gpm and final pump shutoff pressure (with minimum recirculation flow) of approximately 1425 psi.
Attachment 1 Page 14 C. Two additional 6-inch, 600 pound class gate valves MOVs AF 3869 and AF 3870, were also tested under full-flow conditions in TP 851.51. These valves were supplied by a different vendor; Powell. They have slightly different internal design and are equipped with a slower, 25-second closing time Limitorque opera-tor. Also, the design basis differential pressure and flow are not as severe for these two MOVs as for MOVs AF 599 and AF 608.
The full-flow test results indicate that the required closing thrusts were 10-15% higher than calculated for one of the Powell valves due to apparent valve degradation and approximately 10%
less for the other similar Powell valve.
D. A full-flow closure test was performed on SW 1380, a 4-inch, 150 pound class Velan gate valve in the service water system.
The valve closed acceptably against a 92-psi shutoff pressure at the closing torque switch setpoints determined by the standard stem thrust calculations.
E. Full flow testing of RC 11, PORV block valve, a 2 " gate valve was conducted under TP 851.27. This valve was stroked closed successfully under full system differential pressure of 2155 psi.
A power trace was taken from the MCC due to inaccessibility during hot standby conditions not allowing access to the valve O to obtain a TMD trace. This valve closed with the thrust predicted.
F. MS 106 and MS 107, 6" Velan Gate valves identical in design to AF 599 and AF 608 but with smaller actuators and with a 31 sec.
stroke time, were closed under 885 psi differential pressure.
The valve thrust traces indicate the valves close as expected with, approximately 3% and 13%, respectively, less thrust than the standard calculations would predict.
VIII. EVALUATION OF FULL-FLOW AND STATIC DIFFERENTIAL PRESSURE TEST RESULTS A. Toledo Edison has evaluated the results of full-flow differen-tial pressure tests on the 8 MOVs. The full-flow differential pressure test results indicate, that under worst-case differen-tial pressure and flow conditions, actual required stem thrust for AF 599 and AF 608 were higher than expected based on the standard calculations used to predict stem thrust for the MOVs.
The results also indicate that the source of the increased stem thrust is related to the differential pressure acting on the valve disc during movement since increased stem thrust is not evident from a re-examination of the zero differential pressure tests and did not become evident until full-flow testing was performed. The balance of the testing confirmed the standard calculations predict the thrust needed to operate all other tested valves.
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Attachment 1 Page 15 L
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B. The static differential pressure tests conducted on the 26 MOVs indicated that certain HOVs had opening stem thrusts greater than predicted by calculations. This indication was apparent from the MOVATS testing data even though the hydrostatic dP for the opening test quickly dissipates once a small flow path past the valve disc is established. This indication was originally masked by the initial, higher stem thrust required to dislodge the valve disc from its seated position (breakaway thrust) and was not initially evident since the torque switch setpoints are bypassed to ensure opening. The test results for MOVs AF 599 and AF 608 clearly recorded an increased stem thrust which persists for the time between initial disc movement and establishment for a flow path between the valve disc and seat. Evaluation of the opening thrusts measured for each of the other 26 MOVs that were static differential pressure tested indicated'that required opening thrust for one additional valve, MOV DH 830, was higher than expected based on standard calculation. It was determined that in no case should the closing thrust for torque seated gate valves be more than 61% above the calculated values as occurred for MOV AF 599.
This conclusion resulted in a review of the calculated thrusts as compared to the torque switch trip settings for the closed direction for all valves of this type. Where it was possible, the torque switch trip setting was increased to give a 61%
margin above the calculated thrust. In some cases, the maximum setting was limited by the valve or operator design, and the setting was compared to the actual average running thrust and the margin established using that data. This gave Toledo Edison confidence that all the important to safety gate valves would close against the design differential pressure even though they were not all tested.
The evaluation of reasons for the Velan Valves (AF 599/608) to have actual required stem closing thrust greater than the calculated thrust is still ongoing and no conclusions regarding this matter are available at this time. See attachment (7) for additional discussions on AF599 and 608 flow testing. For smaller valves, stem thrust to overcome the packing friction is a greater portion of the total required closing thrust so that differences in actual required stem closing thrusts and the calculated thrusts would not be significant due to the differential pressure forces.
Finally, valve designs other than gate valves.were evaluated. ,
As discussed below, only gate valves are subject to increased thrusts as found in the full-flow differential pressure valve ]
opening tests. Other valve designs evaluated and determined to be unaffected are:
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Attachment 1 Page 16 3
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- Quarter-turn Valves--This design type includes MOVs that require only 90 degrees of travel to go from open to closed. This includes butterfly and ball valves. These MOVs are opened and closed based on position using limit switches. The torque switch serves only as backup, and torque requirements are determined by disc / seal friction interaction, not by flow or differential pressure. This design type of MOVs also has an excellent reliability and performance record under flow conditions. This is eviden-ced by the fact that a majority of these valves at Davis-Besse are stroked under flow conditions and no problems have been experienced. Hence it is concluded that current limit.and torque setting provide the desired level of confidence for continued reliability and function for these valves.
- Globe Valves--This design type includes all globe, torque-seated valves. These valves open and close in-line with flow and differential pressure. Resistance to closure and/or opening is much more readily defined than are the frictional forces perpendicular to flow and differential pressure for gate valves. Static differential pressure test results coupled with the reliability record for these valves indicate that current torque switch settings provide the desired level of confidence for continued reliability and function.
IX. CONCLUSIONS FROM DIFFERENTIAL PRESSURE TESTS A. Based on the results of full-flow dP tests of selected MOVs and subsequent additional evaluations discussed above, the following conclusions are reached:
- 1. For gate valves at Davis-Besse, the stem thrust to open or close a valve under full-flow condition can be conservatively, predicted using vendor-supplied formulas. It has been found, however, that certain valves operating under unusual conditions or valves suffering from internal degradations can require thrusts exceeding the calculations. This increased thrust can be observed and evaluated using either static differential pressure tests or full-flow differential pressure tests.
- 2. The largest increased thrust above the calculated values observed to date was 61% for MOV AF 599.
- 3. Ninety-degree turn valves, globe valves and most gate valves, large and small, close against full flow with less p than the stem thrust / torque expected based on standard y calculation methods.
- .~ . - -- ,- . - - - - . -
Attachment 1 Page 17
!O B. As part of the ongoing MOV Reliability Improvement Program, TED
, will:
- 1. Determine the root cause for the actual required closing stem thrusts to be higher than that calculated for the two associated valves, AF 599 and AF 608. This. root-cause' evaluation will be performed prior to the end of the fifth 4
refueling outage and may include, as appropriate, compari-i son to similar valves, additional testing, closer monitor-
, ing of valve performance, and/or internal inspection of the valves.
- 2. Evaluate the need to increase the use of static dP testing as a diagnostic tool in determining MOV conditions. Since full-flow dP testing is more complex than static dP, the evaluation will further confirm that static dP testing provides information similar to that provided by full-flow dP testing. ,
- 3. Evaluate the need for continuing the increased torque switch setpoints discussed in Section VIII in order to minimize any resulting valve wear and need for maintenance.
! 4. Reset torque switches, as appropriate, based on the contin- -
uing analysis and testing. Until more data is obtained and to ensure closure, close torque switch settings for gate valves within the scope of the MOV Reliability Improvement Program have been set with at least a 61% margin above the calculated valves for design-basis conditions or, for two valves, set to their maximum settings unless tests or normal operation indicate the MOV properly operates with its current torque switch setting.
i X. PROGRAM IMPACT i
l
- 1. Based on the MOV inspections, testing and evaluations conducted
! to date and the revised torque switch setpoints, Toledo Edison has determined that the 165 MOVs important to the safe operation at Davis-Besse are capable of performing their intended function.
j 2. Continued maintenance of the valves and operators in accordance with the preventive and corrective maintenance programs established will ensure reliable operation when combined with the balance of the program previously defined.
! 3. The cost impact of Toledo Edison's motor operated valve program '
- was significant-both in time and manpower expended. It was
- evaluated that this expense, taken in one installment to insure l()
l reliability of all the MOVs, will in the long run, be the least expensive path. Costs due to forced outages and unplanned
- maintenance in future years will be greatly decreased.
4
_ _._. - , _ __. _ . . ~ _ _ , . _
Attachment 1 Page 18
- 4. In undertaking a program of this size, coordination of work is essential. Toledo Edison took the approach of incoporating
" lessons learned" as the program developed which prouoted an overall coordinated approach to be maintained throughout. A flowchart of the basic program elements is included (Enclosure 1). Close coordination between Maintenance and Operations by the planning organization is also necessary to be sure that critical path time is minimized. Sufficient spare parts, work spaces identified and redundant test equipment availability are
- all additional key elements.
- 5. Based on the development of this program and the use of diagnostic equipment to determine proper valve operability, post-maintenance testing was also reviewed. The potential for corrective maintenance tc affect thrust delivered to the valve stem required to operate the valve under limiting condition was observed in the program data. In this respect, the need for post-maintenance diagnostic testing must be considered whenever corrective maintenance is performed which involves actuator disassembly, valve repair or packing adjustment or replacement.
C l
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O MOV REPORT
f \
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ENG. LIST OF MAINT. PROVIDI ENG EVALUA STEM CHECES DATA TO ENG. 1VENN}R (Tp PRE-MAINT.
LLRT (IF REQ'D i UNSAT TEST RESULT
^ - - -
REWORK / POST MAINT WIRE CHECK NCR TES ENG. REWIRE VLV. A
" -M- D 1051 TION
J, NO FCR FMD DISCONNECT 1' al0 VATS TEST POST MAINT. CLOSE M.W.O ENC. EVAL.
lFNC. '
SPACE HTRS. VLV. - D/P OP TEST & AND SEND TO DATA AND g SPACE HTRS. g
- c,,c, -- TEST Ir . --. R- w - ac. _~ mm REQUIRED SERVICE PROCEDURE ENC. LIST OF % MAINT. "EQ" % REWIRE W/EQ "EQ" VAL (ES WIRE CHECK WIRE IF REQ'D
.w MAINT. EVALUATE MOVATS TEST _
ENC. LIST OF MAINT. CHECK ENC. MAINT. REWORK T-DRAINS OR INSTALL *' RESOLUTION AS
- AS RFAUIRED T-DRAINS erntefern NOTES:
YES I) Not all activities required for all valves.
MOV. LUBE LUBE CHECK
- 2) Sequence of events may veryr sequence shown is " Ideal".
CHECK SAT
- 3) M.O.V. opeability assured at satisfactory completion of MOVATS test. Evaluation process post-test is rettability NO oriented.
IDENTIFIED DISASSEMBLE REPLACE PARTS REASSEMBLE /
I RELUBE INSPECT AS REQUIRED REINSTALL r
VALVE PEPACK stavocawuseev catcut avion e.o. naves.om mo.
REQUIRED 4m CALCULATIOM SHEET
.Dav
- c. i s-Be s se M.O.V. Reliability Improvement Pr'aram (Ceneric) ominematon se cuecsso 0
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! Docket No. 50-346 -!
License No. NPF-3 l Serial No. 1357 '
l Attachment 2 ,
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- ATTACHMENT 2 l
SUMMARY
OF MOTOR OPERATED VALVE PROBLEMS BY CAUSE i k
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n ATTACHMENT 2
SUMMARY
OF MOTOR OPERATED VALVE PROBLEMS BY CAUSE (Data assembled from review of 2221 MWOS completed following June 9, 1985 trip to December 20, 1986)
OPERABILITY NUMBER OF % OF CONDITION OCCURRENCES OCCURRENCES MOVS THAT "AS FOUND" WERE UNABLE TO PERFORM THEIR INTENDED SAFETY FUNCTION 17 10 SIGNIFICANT MOV PROBLEMS THAT LEFT UNCORRECTED COULD POTENTIALLY AFFECT MOV OPERABILITY 58 35 NO MAJOR PROBLEMS THAT AFFECTED MOV OPERABILITY 90 55
, Total 165 MECHANICAL O
V 6 4 LOOSE MECHANICAL PARTS GREASE NEEDED CHANGING 56 34 GREASE LEVEL LOW 4 2 SPRING PACK GAP ( > .020") 8 5 CLEANED MECHANICAL PARTS 1 .6 VALVE REPAIR REQUIRED 7 4 VALVE PACKING REPAIRED / REPLACED 5 3 INCORRECTLY INSTALLED PARTS 1 .6 HIGH RUNNING LOAD (VALVE) 9 6 REPAIRED / REPLACED DECLUTCH PARTS 24 15 REPAIRED / REPLACED WORM SHAFT PARTS 5 3 REPAIRED / REPLACED DRIVE SLEEVE PARTS 6 4 REPAIRED / REPLACED SPRING PACK PARTS 13 8 LIMITORQUE MANUFACTURE DEFECT 4 2 Total 149 ELECTRICAL UNBALANCED TORQUE SWITCH 34 21 LOOSE ELECTRICAL PARTS 4 2 CLEANED ELECTRICAL PARTS 4 2 UNQUALIFIED CONTROL WIRE 102 90 NOT WIRED TO DRAWING 137 83 HIGH MOTOR CURRENT ( > 10% RATING) 0 0 REPLACED TORQUE SWITCH ASSEMBLY 25 15 REPLACED LIMIT SWITCH ASSEMBLY / PARTS 17 10 REPLACED TERMINAL STRIP 5 3 REPAIRED / REPLACED WIRE AND OR LUGS 27 16 REPLACED MOTOR ASSEMBLY 0 0 INCORRECTLY INSTALLED SWITCHES 4 2 l
Total 359
OPERABILITY NUMBER OF % OF CONDITION OCCURRENCES OCCURRENCES DESIGN OUTPUT EXCEEDS UNIT RATING 4 2 OUTPUT EXCEEDS VALVE RATING 2 1 OUTPUT LOW FOR D.P. 7 4 HIGH INERTIAL THRUST ( > 100% C.S.T.) 2 1 INCORRECT SEATING CONTROL 5 3 CORRECTED PREVIOUS TORQUE SWITCH SETTING 4 2 Total 24 SWITCH SETTINGS BYPASS SET INCORRECTLY 26 16 TORQUE SWITCH SET NOT SET PER DESIGN DOCUMENTS 0 0 INCORRECT LIMIT POSITIONING 11 7 BACKSEATING VALVE CONDITION 9 5 Total 46 O
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Docket No. 50-346 License No. NPF-3 l Serial No. 1357 l Attachment 3 ATTACHMENT 3 VALVES INOPERABLE "AS FOUND" i
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PagP NB. I M/02/97 ,,
ETWt (FDATD MWES IIEFOURE 'AS FDAt*
VALE RBET!W ACMT5 STUE ME VALE ME EATIE LIMITIE EASW F3 VALE 100MBILITY SAFETY
$1K TIE MNGE. TWE SilE camel 83 (PSID) DIECT!W ISEC) (IN.)
se Afyg CIV TD 576 C4-2W 981 9.5 Ul " GATE 6 TGef 1425 fvPASS ET SET TO CD6 VALE DIC lsEEAT!s, MPUT TIAST TD0 LN TD (FDATE ME AGAIET LIMITE D/P e* E608 CIV TO !ETS C4-!@ 9 81 9.6 Elm GATE 6 TWEE 1425 MPUT 11AST LDu FtR LIMITIE ON DIC H @{W9 tf1Misi GILDS SFPLY 9 0000 20.8 Elm GATE 4 T3EE 99 IMUTICIDT TRET TO M MVE C AGAIET LIMITIE D/P. APPil0I.100L LW H 2 15674 CIV4MC SPPLV 9000 9.9 VEuti GATE 3 13ef 150 M TO A DEFECTM LIMIT WITDI TIE C VALVE SitFPD 1.5 Etae6 INTO ITS (FDI STIBI H 2 4100 117 !EALS DISDWE (P36-1) 9000 12.6 VELM M l.5 TOIRE 2155 TWEE 91101 ETTIE IAEED 3 C LIMIT!E D/P 71508. Elm EVID EEALD LIMITIS D/P IS 2128.
- CC4200 AIF EALS DIS 0eeE (P36-2) 9000 12.4 VElm M !.5 15ef 2155 TDARE WITDI SETTIS WWED 3 C LIMIT!E D/P 71508. ESim EVID IEEALID LIMITIE D/P IS 2128 M 71D TM DIDARE 983 56.9 VE1Jel MTE 14 TWEE 640 TWEE WITDI IleALNEZ CALEED 11AST N 10 E APPlet. 501 LW 10 IFGATE VALVE (15ED AT LIMITIS 9/P H US TM VIFB Pall (MS-TIE 90000 5.7 VE1Jul M 1 TWSE 655 MWE IIDDS!!D LPsi NEP M E N CL!IED fvPW,M TO LEE IM WITDI (DifACT
- CY6240 LDK 1EST CIV 95000 10.8 Elm 041E .75 15eE 40 VALVE If6 Ftue ullit IEW STEM N H CV50!!E CIV CTIff 8A6 AMIL315 9 0000 13.5 WIleELL DIAreAM 1.5 LIMIT 50 MWE STDI NEEN, DIAPWut FLIT M C,0 10 065!Z0 ACMTR H CVM73 NetA.tB VADAft IELIEF 9 0000 9.6 F19ER IUT10 FLY B Lill!T 40 VALVE FAILD TO 901 DLRIS M Ftue C,0 TEST M TO IAC 15ef 91T04
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Docket No. 50-346 License No. NPF-3 Serial No. 1357 O Attachment 4 ATTACHMENT 4 VALVES WITH SIGNIFICANT PROBLEMS O
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Docket No. 50-346 License No. NPF-3 Serial No. 1357 Attachment 5 ATTACHMENT 5 VALVE PROBLEM
SUMMARY
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.O o IEITWt IFE%TD WALT 1 IIFSE'/Jff PAtWUut o
FIWL SLIOGRY IEPET ACT!*TW STitBI MW VALVE MW BTIE LIMIT!E 9/P KDIPT13 7 KSID KDIPTB & PRIELD K DIPT!3 7 PEDWIICE EDIPfD 7 ELETR! CAL SIZE TIE MuRT. TYPE $1N CDmitL DELTH (PEu PADILD M TO 910 SETTIE PMLD FIERD ISED IPSID) (LOK
- CV50!00 9 0000 10.0 CDmDETICS KL 1 LIMIT 40 0/C Llfili tildes ET ET TD EllElikli M Wi1 DES EPLMB (210D 15EE Sf!D PIEFDLT (PDt M (LE WALWE MIS ELIE 9 5000 10.0 C9memTICS BALL I LIMIT 4 O/C IEPUIED BAO M SEFT EPUED MG LIMIT WID ESIM WIIIE F1IERIAE 9 5000 10.0 (3memT!3 BALL 1 LIMIT 40 D/C IEPUIED Il0 W IEMIE R WlED PER MSIS WIS 95 RRNE ELE 9 0000 10.0 CamOETICS BALL 1 LIMIT 40 0/C ts!T WS 19 TD DEE Full Intst TD leitR (FDAT!W M TD IfMIG WEAE R M (FDATR H CV501E 90000 10.3 CamonTICS IALL 1 LIMIT 40 O/C BIG PD MSIS DAAuls AS EPUIED IIRILIFID u!E
- e CV501C0 90000 11.4 C3mDETICS tlLL 1 LIMIT 40 0/C BIG INIT PD KSIN WIAulW, EPLAtB LIAMLFID ulE se CV5010E 9 5000 14.4 E! SELL D!artest 1.5 LIMIT 40 0/C BTIE (SmEL lAS DluRD TO MW MG 919AIERT AS BIG PER MSIR MIu!E LIMIT FIDIl!ME A6 95L15T IEPAIR 80 TO DEEIE TIAST ACTIATWt Alell DEDS VILE #PLID SV M ACitaTR FAIL MIE 90000 14.4 WIWELL D!aPIIIII 1.5 LIMIT 40 O/C mam arn Tmat WID 2 TO I CLE
- e CV50!!A 9 5000 !!.! (amotTICS IAL1 1 LIMIT 40 O/C IENIIED tmIT PU KSIW MINIS, IEPUIED LISSLIFID WIRIE
- CV50llt 9 5000 10.0 CGITMISTICS BALL 1 LIRIT 40 0/C IELE3 th!T M WITDES BilED PD MSI91 WFW 95000 10.0 (3memT13 RL 1 LIMIT 40 D/C IIRIE ELE IEPUID Inmi 1951 ENIE 9 95 FilWG H CV50!!C Be000 10.9 CamuseTICS titi 2 LIMIT 40 O/C BIG it!T PD KSIPE suule, IEPulED inesLIFID u!E n CV50!!D 90000 9.7 CDmimpTICS BALL 1 LIMIT 40 0/C AILil5TD LIMIT ST(PS TD BIG PD KS3 MIulG PREDLT PtEITD WilLWE
Page h. 7 04/02/87 >
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Docket No. 50-346 License No. NPF-3 Serial No. 1357 Attachment 6 ATTACHMENT 6 DIFFERENTIAL PRESSURE TEST
SUMMARY
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SUMMARY
OF MOTOR OPERATED VALVES
- DIFFERENTIAL PRESSURE TEST
SUMMARY
ACTUAL OPERATIONAL ORIGINAL D/P TEST LIMITING D/P ACTUATOR PRESSURE
- REQUIREMENT DESIGN D/P ITEM VALVE NO. RANGE, PSIG OPENING CLOSING PSIG 1 AF 599 1050-1480 1425 1425 1270 2 AF 608 1050-1530 1425 1425 1270 3 AF 3869 450-1200 910 171 1300 4 AF 3870 450-1275 910 171 1300 5 AF 3871 700-1050 910 171 1300 6 AF 3872 580-1050 910 171 1300 7 CC 2645 99 89 89 150 8 CF2A 700 630 630 700 9 CS 1531 240 220 239 720 DH 7A 40 75
()
10 34 34 11 DH 9A 54 36 36 75 12 DH 830 420 222 222 350 13 DH 2734 300 164 164 300 14 DH 2735 425 296 450 3600 15 DH 2736 420 296 450 2240 16 FW 612 1075 1450 1450 1200 17 HP2A 2180 2210 1927 3050 18 MS 611 1050 879 1050 915 19 MU1A 2155 2200 2525 2500 20 MU2A 2400 2200 2525 2500 21 RC239A 2435-2515 2525 2525 2185 22 SW 1380 90-92 142 142 150 23 MS 106 885 1100 1100 1050 24 MS 107 885 1100 1100 1050 25 RC11 2200-2260 2525 2525 2500 26 MU4 2125 2185 2655 2500 l
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- As a minimum, testing occurred at the maximum and minimum of the range listed.
O Page 1 of 2
7 77
\j ATTACHMENT 6 (CONT'D)
TEST PLANT ORIGINAL ORIGINAL METHOD OPEN/CLOSE MODE ASME/ ANSI ASME/ ANSI (FULL FLOW / TEST DURING CLASS RATED ITEM VALVE NO. HYDRO) DIRECTION TEST LBS (1) PSIG 1 AF 599 Hydro, Flow O&C 5 600 1440 2 AF 608 Hydro, Flow O&C 5 600 1440 3 AF 3869 Hydro, Flow O&C 5 600 1440 4 AF 3870 Hydro, Flow O&C 5 600 1440 5 AF 3871 Hydro 0 5 600 1440 6 AF 3872 Hydro 0 5 600 1440 7 CC 2645 Hydro 0 5 150 240 8 CF2A Hydro 0 5 600 1365 9 CS 1531 Hydro 0 5 300 615 10 DH 7A Hydro 0 5 150 210 11 DH 9A Hydro 0 5 150 210 12 DH 830 Hydro 0 5 300 680
/T 13 DH 2734 Hydro 0 5 300 470
\) 14 DH 2735 Hydro 0 5 1500 3600 15 DH 2736 Hydro 0 5 1500 3415 16 FW 612 Hydro 0 5 600 1380 17 HP2A Hydro 0 5 1500 3500 18 MS 611 Hydro 0 5 600 1200 19 MU1A Hydro 0 5 1500 2770 20 MU2A Hydro 0 5 1500 2770 21 RC239A Hydro 0 5 1500 2770 22 SW 1380 Full Flow O&C 5 150 255 23 MS 106 Full Flow C 3 600 1110 24 MS 107 Full Flow C 3 600 1110 25 RC11 Full Flow C 3 2500 4620 26 MU4 Hydro 0 5 1500 3415 NOTES
- 1. USAS B16.5-1968.
Page 2 of 2 O
v t
Docket No. 50-346 License No. NPF-3 Serial No. 1357
- Attachment 7 i r I
a i
i i
ATTACHMENT 7 i
FLOW TEST RESULTS j 1. AF 599 and AF 608
- 2. MS 106 and MS 107
- 3. SW 1380 l 4. RC 11
4 i
t i
i 4
0 a
i
s A
v
() ENGINEERING EVALUATION OF TP 851.49 AND TP851.50 TEST RESULTS P. N. Carr, R. C. El f strom, J. D. Ewald I.
SUMMARY
The testing of AF599 and AF605 indicates a higher than thrust during full flow closure. calculated However, this thrust is within the operator's capabilities and is not expected to be harmful to any of the valve's components. The valves are, at the torque switch set-points determined in this test, able to close at the design differ-ential pressure of 1425 psid and are fully operable.
The pressure, flow and thrust data was reviewed and determine the reason for the observed forces needed examined to to However, none of close.
the evaluated reasons can be determined to be the root cause.
Since these valves have not been disassembled since being installed, it is recommended that these valves be inspected at the next refuering outage. Engineering is to prepare an inspection plan to take detailed internal dimensional data to assist in explaining the thrust traces observed.
!!. DISCUSSION I
During the June 9, 1985 event as COA, valves AF599 and AF608 closeddocumented in Action Plan 12 of the and failed to reopen on demand.
This was due to a combination of high differential pressure and an
- improperly set limit switch bypassing the torque switch.
As part of the corrective action, these valves j were to be tested to verify the adequacy of the limit and torque switch setpoints valve operation. during l A static differential pressure test was conducted to
! confirm the valves would open, and they passed this test. Unfortun-ately, not enough was known about the characteristics of proper valve operation under i these conditions to provide advance notice of the closure problems under full flow conditions. On September 30, 1986, a i
' full flow test was conducted so that the thrust / torque switch setting could be verified in the closed direction. During this test, which was run using the motor driven feed pump, and taking Movats data per l
Mp1410.32, valve AF599 failed to fully close under a differential
{
l pressure of approximately 1430 psi.
Test procedures TP851.50 and TP851.49 were conducted to determine what thrust is required to close AF599 and AF608 and to assist in determining why the additional force is needed to close these valves.
() til.
VALVE DESIGN AND OBSERVED THRUST REQUIREM[hIl
&ll th
7
'5
)
The valves AF599 O Class 600 lbs.
and AF608 are Velan 6" BB Gate Valves; ASME/ ANSI They are rated by the manufacturer for the 1425 psi differential pressure. This is upgraded from the original rating of LalQ psid.
The manufacturer's required thrust for closing and opening at 1425 psid of 15158 lbs. is based on the formulas shown on the calculation sheet attached. _
The actual test results indicate that it requires about 24,000 lbs. of thrust to close (shut off flow) for AF599, and about 22,000 lbs. of thrust to close AF608 at the 1425 psid. These values are obtained from the attached curves developed by this test procedure.
The maximum thrust the valve manufacturer states that the valve is designed for in the closing direction is 35,513 lbs., based on bending of the stem.
IV. VELAN (EXPLANATION)
Velan cannot explain the data observed. The observed thrusts are much higher (i.e., 7,000 to 9,000 lbs.) than that given by the Velan formula which is given as O Stem thrust = orifice area x seat factor x differential pressure + line pressure (P) x stem area + packing friction load T = OA X DP X SF + P X SA + PF where the seat factor (SF) = .3 orifice area (OA) = 26.05 stem area (SA) = 1.766 differential pressure (DP) = 1425 packing friction (PF) = 1500 (see attached calculation sheet for details)
Velan is still reviewing the test data. They do not have inhouse flow testing experience with which to make comparisons.
Velan did furnish us with a report on an 8" gate valve, which was tested by Ontario Hydro *under flow conditions at 1800 psig, and its thrust was within 10% of the calculated (using Velan formulas) value.
However, this was a 900 lb. Class valve, not a 600 lb. Class valve, and its design is different.
V. DISCUSSION OF ADDITIONAL ATTRIBUTES CONSIDERED
- 1. The system.contains similar but not identical 6" Powell gate
() valves. AF3869 AF3870, AF3871 and AF3872. These are also cpeog/a
9 s-O 600 lbs. Class. However, they appear to be of a heavier construction. The speed of closing is much slower for the Powell valves. Design clearances on the Velan valves guide to wedge guide slot is much tighter than the powell valve and Velan uses stellite surfaces on the disk guide slots. Velan uses a 7 degree seat angle and Powell uses a 10 degree seat angle. In both valves the disk is nearly seated before the disk comes off the guides. Powell uses stellite only on the valve and disk seats. The guides and disk guide slots are of carbon steel.
- 2. Of the above design features, the guide to guide slot friction was looked at as being a possible source of the additional forces. The formulas would indicate that the friction between carbon on carbon would be greater than that 1 of stellite on carbon. However, the Powell valves require less thrust to close, so the observations can not be explained by this difference. See attached calculation.
4
- 3. Speed of closure has been suggested as a possible reason for the additional forces. No formulas or data has been found to back this idea. The hydraulics associated with a high differential pressure closure of a valve do not appear to have been well explored by valve manufactures or textbook authors.
4 4
Wear on the valves causing increased surface roughness on the guides of AF599/AF608 are possible as well as rough surfaces due to failure to put stellite on the disk guides.
AF599 and AF608 were manufactured at the same time as M5107A. MS107A had an original disk from the manufacturer without stellited guides. AF599 and AF600 have been in the system the same number of years and subjected to the same conditions and approximately the same number of cycles. It is possible that they have the same wear. It was noted that MS107A is of identical design but used in steam service. It is expected that it has 250 to 350 openings at about 900 l
' psid and should have more wear than AF599 or AF608, which are normally open and not normally cycled against a high differential pressure. Further investigation into this possibility will require valve disassembly.
- 5. The piping geometry may be a factor. " Banging noises" are heard in both AF599 and AF608 when closing, just before obtaining full closure and perhaps a little past. The gate valves have check valves within three (3) feet on the upstream side. These check valves are tight as full system pressure (plus) is trapped between AF599, AF608 and the 1
associated check, when the gate valve is closed. There is a minimum recirculation valve on the discharge of the motor driven feed pump which apparently introduces some pressure
() oscillations. These do not appear to be of sufficient magnitude (i.e., maximum of 150 psi) to account for the ec @
([b
,()
increased thrust.
- 6. Since this is a 600 lb. Class valve, operating close to its
' design rating, it is possible that " flexing" of the wedge or other parts of the valve due to the high differential pressure, could be causing binding. The vendor stated that this flexing could be as much as 0.003 inches. This should not be enough to cause binding and the traces indicate a smooth increase with no apparent area of binding which would only occur near end of stroke when the full differential pressure is applied. Velan also states that the stem torque in some of their designs, like this, at higher differential pressures, has caused closing problems. This could not be shown mathematically as being a problem with AF599 and i AF608.
It has also been noted that when putting a new wedge in place, the fit up of the wedge to the seats has required I machining of the guides by as much as 0.250 inches, in order to allow for full contact on both seat rings by the wedge.
It is very possible this was also necessary in the factory.
The Velan engineer was not able to answer questions concerning manufacturing practices on Velan valves during the period these valves were made as it was prior to his being in this position.
VI. CONCLUSIONS The test data for AF599 and AF608 demonstrate that they have a higher than calculated opening and closing thrust requirement. The reason for this increased thrust is attributed to conditions internal of the valves not yet completely identified. The operator is able to produce sufficient thrust to open and close the valves at the higher setpoints l
- without causing any over stressing of valve parts.
i Internal inspection of the valves is not needed prior to restart, how-
) ever, to answer all questions on why the thrust is higher than
, expected, an internal inspection should be conducted on at least one valve (AF599 - the worst case) at the next refueling outage.
4 I
Attachments l
- 1. AF599 - thrust vs. differential pressure curve
- 2. AF608 - thrust vs. differential pressure curve
- 3. AF599/AF608 - vendor motor operator calculations and i
Attachment IA of NEP-091 4
and Torque Switch Calibration Curves i
U 1 l ufa/U s
i
_._ _ . ~ _ _ _ _ - _ _ _ _ . - . _ _ _ _ _ - . - _ _ _ _ _ . . _ _ _ . . - _ _ _ _ _ .
e O 4 AF599/AF608 - thrust signatures
- 5. Calculations
- 6. Test Data
- 7. Attributes considered O
r O
9 i
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l O
ps 4/ee 1
1._._..___..-._ _ . _ _ . _ . _ . , . . . _ _ _ _ _ _ . . - _ _ . _ _ _ . _ . . _ _ _ _ _ . . _ , _ _ _ _ _ _ _ . _ _ . . . _ _ _ , . _ _ _ _ . _- _ _ , _ _ _. , _ _ _ _ _ _ _ _ . . , , _ _ , _ . . _ _ . _ _
. . _ = - . . .
1 ' 1, v
O Attributes Which May influence Closing Of Valves 1
Under Flow Conditions Based On AF599. AF608 Test Results )
- 1. Gate Valve - Flex Wedge.
, 2. Valve is operating at its maximum working pressure for its ASME Class. l
- 3. Valve is high speed, i.e., 36 in./ min. by Limitorque definition.
4 Valve internal clearances, l i.e, wedge angle, guide clearances.
etc.
- 5. Internal surface finishes on contact areas.
- 6. Internal materials of valves.
! 7. Fluid type, i.e., steam, water.
- 8. Differential Pressure across valve on closing. -
- 9. Flow through valve. .
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1
O POINTS PLOTTED ON PRECEDING GRAPHS AF-599 AF-608 i Calculated Seating Unseating Calculated Seating Unseating X Y X Y X Y X Y X Y X Y 1
1050 11400 1220 17587 1050 15000 1050 11400 1130 15500 1250 15100 1425 15000 1482 25200 1400 19000 1425 15000 1270 .16500 1250 16000 1450 19300 1320 19300 1375 16800 1450 20200 1350 19100 1450 18800 1530 23300 1600 '19200 X Values = DP IN PSID X Values = DP IN PSID Y Values = Stem Thrust in Pounds Y Values = Stem Thrust in Pounds 1
1 i
i I
O
c,. : v i '
g SEAT THRUST: 6925 DATE: 16 '6 4 185. '
PISTCk EFFECT: !!43 sggg, g ~~
GLAkD FRICTICk: 1500 tag, L8s,
- TCTAL STEM THRUST: 13668LES.
O nTTACIDENT f 1A~
Motor operated valve (NOV) Destant
[#V599 6 Valve No. (TED) 897 d
Manufacturers _
VELAkV (6" 6000 8.8. GATE VALVE - FCRGED)
Valve Drawing No. (MTR): P3-10lf-A19
- 1 Stes Material: S.S. 410 (ASTM-A-479)
Dise (Tria) Mat'l C.S. kCB (ASTM-A-fl6) - N/ FACED - STELLITE AC. 6 t nody Mst'l __ C.S. (SA-105) I i
Stas Diameter-Miniana (inches) I 1/2 Stes Thread Diameter (inch) I I/f" l
Sten Psteh (tach /thrsed) __3-ACME TRIPLE 14ad (No. of Threads)
Valve serial No. __ Actuator Serial No. i Rated Temperature (T) 300 Rated Pressure (Psig) _ !!70 i Hydrotest (Psig)-Body Seat __
Differential Pressure Test V/0perator - Psis _ If70 Valve stes Thrust (or Torque) Required to Actuate:
O ^-
^* ^ > <
- 2 P ==> a2 >> - "" ""' "" '
1.
To Clase-Ds (or FT-DS) 1500 LES. (34 FT. CBS.)
- 2. To Open D$ (or n-DS) 1450 18S. (37.5 FT. LES.)
.J. At Rated Temperature & Rated Pressure
'1.
To Close-DS (or M-DS) 13468 L8S. (310 FT. LES. )
- 2. To Open- DS (or FT 33) i 15035 L83. (347 FT. L8S.) {
C.
AtRatedFlowCInditions 1.
To Close-3 5 (or FT DS) AS IK "B" ASCVE
Maximus. Stes Thrust at vdch point the weakest Valve Member vill yield:
a.
In the Close Direction (us) 35513 LES.
the Weakest Member is STEM
- b. In the Open Direction (34) the Weakest Member is O rb a/24 7 QATE: Ib rz #5 SIGkEO BY- '%=
g R.F. CCUTikHC
1
- i MOTOR OPERATOR CALCULATIONS P.O. No. OR PROJECT: DAyf3 SESSE RIT.: P3-1072-W /73 CUSTOMIR NA"._: TOLEDO EDISON VELAN NO.: P3-1012-V ITIMS: 891 (TAG: #V599 /HU6011 VELAN DWG. NO.: -
l VALVI DESC: 6 " 300 LBS. 8.8. GATE LINE PRESS: 1270 PSI ,
ORIT. DIA.: 5.76I ORIT. ARIA: 26.05 AP f f 70 - PSI 9 TEMP. 100 ,T .
STEM DIA.: !.5 STEM AREA: I.766 Tg I/3 y I L LIy;; 6 I/4 n STEM THRUST: 0.A. x AP x SEAT FACT.: 26.05 x I270 x 0.3 -
9925 LINI PRESS. x 5. A. = 1270 x f.766 = 2243 E N TH @ST = 3743 LES. . Packing Triction Load = 1500 E N TORQ#E: 85 FT. 18S. Total' Sten Thrust =
13668
- STEM TORQUI = STEM TERUST x STEM TAC . 13668 x 0.02269 = 3!0 't , i O/A OR UNIT RATIO = MOTOR DESIGN R.P.M. = = = i STDi SPEED IN. / MIN.
MOTOR CALC. TORQUE =
STEM TOROUE PULL OUT EFT. x APPL. FACT. x O/A MTIO x x ,
MOTOR CALC. TORQUE f RDUCID VOLTAGE =
N.B. IF DC SUPPLY, DO NOT SQ. I V.
= = 'd '
(;yggg,)4 STALLED TORQUE = MOT. STALL TORQUE x ST. ITT.
- x O/A RATIO z
@ 110" VOLTAGE x x x = 'd gf; pgti, . 2 x STEM TORQUE = 2x , g H/W RATIO x UNIT EFF. x H/W DIA. x x ,
MAX. TORQ. SW. SETTING : MOT. TORQ. x F/0 ETT. x APP. FACTOR x 0/A RATIO:
(@ RED. VOLTAGE) x x x x : 'i MAX. H/WHEIL TORQUE = MAX. VALVE 70 ROUE ' -
H/W RATIO x ETT.
--x- = 'l OPERATING TIMI = (60 x LITT) + STEM SPEED = SECONDS.
OPERATOR WITH TT.# MOTOR. MAI. THRUST: #
MAX. STEM TORQUE = 'l 0/A RATIO RANGE
- H/W MTIO = :1 ADD GEAR :1 MAX. STEM DIA.:
CURRENT SUPPLY VOLTS C MUST OPERATE AT IVOLTAGE 0 REV. J 1 2 3 t. 5 6 CO.91 LED By: g, APPROVD BY: QL IND. REV.BY:
l
- 72-11-76, REV. 1
,fa a 4 .
l l
- - - . - = __ .
'I
.i MOTOR OPERATOR CALCULATICKS P.O. NO. OR PROJECT: DMTS 8 ESSE RET.: AFJYf'/(cp CUSTOMER NAME: TOLEDO EDISC# l VELAN NO.: P3- f ot2.o ITEMS: S9: 7ay(Hvm /w 6ct) VELAN DWC. N0.:
VALVE DESC: L " Ja.gg__L35. 13 . O CATE v LINE PRESS: MJ3" PSI I ORIT. DIA.: 5 76/ ORIT. ARIA __ 4 6 . o S- 4 P /J f o PSI f TEMP. ma 'y, STIM DIA.: /. 7 6 6
/. S* STEM ARIA: TD: '/3 7 i L LITT: __(, V+ "
STEM THRUST: 0.A. K o? x SEAT TACT.: 24.o t- 2 /,fgg,,, x .3 = / / /J (,
RUM THRUST .
LINE PRESS. x 5. A. = E x _ /. 7 7 =
2 en 183. Packins Triction Lead = / roe RuN TORQUE: FT. IRS. Total Stes Thrust =
/r/.5 s i STDi TORQUE = STIM IIRUST x STIM TACT. x = 't 0/A OR UNIT RATIO = N0 TOR DESI'JX R.P.M. . . .
~
STEF. SPEED IN. / MIX.
TIRIAD LEAD /
MOTOR CALC. TORQUE =
STDf ICROUE =
PULL OUT ETT. 2 APPL. TACT. x O/A PATIO x x 'I MOTOR CALC. TORQUE f RDDCD VOLTAGE = = z *f' N.B. IT DC SUPPLY, DO NOT SQ. I V.
(2 Volt.)#
STALLED TORQUE = MOT. STALL TORQUE x ST. EFT. I x 0/A RATIO =
f 1102 VOLTAGE x x x s 'f H/W PULL = 2 x N TORQR s 2x , ,
R/W RATIO x UNIT ETT. x M/W DIA. x x MAX. TORQ. SW. SETTINC = M07. TORQ. x P/0 ETT x APP. FACTOR x O/A RATIO:
(ERD. VOLT. ACE) x x x x z 'd MAX. H/WRIEL TORQUE = MAX. VALVE TORotrE I/W RATIO x ETT.
s x .g '
t OPERATING TIME = (60 x LIFT) + STEM SPEED = SECONDS. .
OPDATOR WITI TT.i MOTOR. NAX. THRUST: #
MAX. STDi TORQUE = 'd C/A RATIO RANCE 8 H/W RATIO a :1 ADD GEAR :1 MAX. STEM DIA.:
CURRENT SUPPLY TOLTS C MUST OPDATE AT EVOLTAGE 0 RET. 1 2 3 4 5 6
- COMPILD BY
- g APPROVE SY: /$
IND. REV.3Y:
- 72-11-76. RET. 1 4
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- TL -1.0065el
- 7.73 sec.
3330#
.195 sec.
> ^
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23939# -
i 510 ms 8.745 sec.
l l
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- 0" Vy -6.025000e0
=
7.695 sec. T/D 6.25e-1 33'6' !,
TL -6.620e0 3660f momentary torque switch trip due to shock i
. 15805f _
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Y/ 25244# I 8.935 sec.
27619# '
torque switch trip 32174# ,
8.98 sec.
32966# , $w, ; _ . . .=..__-_-__
_ 9.04 sec.
I
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1 15013# -
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- 1215 D/P with glow i
10/15/86 open to close.
B 5 I B 5 5 B I V/0 6.2500-1
- - - .575 sec.
- - .11 sec. Vy -5.54500000
.525 .075 sec. -
sec I/D 6.25e-1 TL -6.980e0 7.765 sec.
8.270 sec.
17587#
8.845 sec.
l 20425f e
! k 8.955 sec.
31382# torque sw. trip '
9.025 sec.
39632# (- -
.- -- -1 . .- . 3 l
- - , e)h e so l
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I j
AF-599 close to open, no flow. Bleed Down 1398f DP V/D 6.250e-1 l
Vy -4.34500000
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l - _
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__ . .. . _ . . __ _. _ . . . . _ . .. 8.275 sec. T/D 6.25e-1 TL -5.820e0 1.
Vy -
8.905 seconds-torque switch trips 31844# ,
8.975 sec.
40095f-l 250 ms (p l, t9 .
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l l
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O O O i
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^"~~~ ~~~'
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_ .065 sec. .095 sec.
l y , 23267#
24516# 8.97 sec.
31591# Torque switch trip -
9.065 sec.
9.130 sec. .. L ._, _ 77 , ___ . ,_ _ _ , , _ ,.. , ,
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/e5 I TL Vx
O O O 1
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.99 sec.
T/D 6.25e-1
- ~'~-
_' TL -7.175e0 3112
, 7.3 sec.
.69 sec.
~ ~
.12 sec.
i _ _
.05 sec.
8.29 sec. -
y _
19224f I
8.98 sec. 23743#
9.1 sec.
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,._.. --__1 - - __. . ,
r*
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.835 sec.
.69 Sec.
1 3171#
7.375 sec.
1 y - 1 09# '
3.21 sec.
s torque sw. trip 23029# -8.9 sec._ __
24575' ---
'#' ' #-~' -~ - - -----
_ 8.965 sec. '
l l
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, 1130 DP
- open to close with flow 1
V/D 6.250e-1 Vy -2.41000000 1
T/D 6.25e-1
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_ .- = .::
3231f .71 sec. .065 sec.
Vy -
15478f 19759#
torque switch trip 22672f -
25568f ---:=--*-----.,
l lD),\p I
. . . . . . . . { I
, IL Vx
Je O Attributes Which May influence Closing Of Valves Under Flew conditiens cared On AF599. AF605 Test Results
- 1. Gate Valve - Flex Wedge.
- 2. Valve is operating at its maximum working pressure for i ts ASME Class.
- 3. Valve is high speed. i.e.. 36 in./ min. by Limitorque definitien.
4 Valve internal clearances, i.e. wedge angle. guide clearances, etc.
- 5. Internal surface finishes on contact areas.
- 6. Internal materials of valves.
7 Fluid type. i.e.. steam.-water.
E. Differential Pressure across valve on closing.
- 9. Flow through valve.
4 O
i I
e
(:)
. w Hfa 7 ee r- = cm-- +y---r y -- - ' '
NED 87-30023
^ January 28, 1987 INTRA. COMPANY MEMORANDUM File 9365, TP850.52 J D 6214 2
,, EEC 87-0020 File enou ?
P. N. Ca y, Senior Engineer SUBJECT Differential Pressure Testing of MS106 and MS 107 Main cteam to the auxiliary feed pump CIV's MS 106 and MS 107 were included in the MOV differential pressure testing for IEB 85-03. The results of this testing, done-in conjunction with TP 850.52, demonstrated the ability of these valves to close against the design differential pressure.
The test pressure for these valves was limited to 885psid due to plant conditions in Mode 3. The design differential pressure is 1100psid. However, the MOVATS traces indicate there is more than sufficient margin to close the valve with the design differential pressure imposed.
The required thrust to seat MS106 and MS107 at 885psid was
~T 6675 lbs. and 7920 lbs respectively. Compared with the thrust (d
produced at torque switch trip of 12,224 lbs. and 21,857 lbs.,
there is more than sufficient margins for the valves to shut against the additional 215psid. The additional thrust needed is calculated as follows:
T = (.3) (P) (OA) OA = 23.05 in. sq.
P 215psid T = .3(215) (26.05)1bs.
T = 1680 lbs.
The necessary thrust to close against 1100psid is then estimated to be 8355 lbs. for MS106 compared to a 12,224 lbs.
torque switch setting and 9600 lbs. for MS107 compared to 21,6571bs. In both of the above cases, there is a significant nargin above required closing thrust until.the torque switch is
- per.ed.
Note thst -he above numbers use test data in providing the fir.al num.bers. The original calculations for these valves produced 12,044 lbs. as the thrust requirement. The difference is most likely due to lower than assumed friction factors for the differential pressure and packing forces.
() PNC: mal ec: Nuclear Records Management mal /9D12
f MOTOR OPERATED VALVE ANALYSIS AND
- TEST SYSTEM DATA PACKAGE VALVE MS106 MWO # 1-86-3724-01 DATE 312-10-86
- * *
- SYhTEM * * * * * * *
- OPERATOR * * *
- SYSTEM Main Steam TYPE SMB FLOW
- SIZE 30 i fo F/ 72-TEMPERATURE 3* SERIAL # :27722'* _
PRESSURE , 885 psid ORDER # :3701I4C SAFETY-RELATED Yes ORIENTATION Vertical
- *
- ELECTRICAL * * * * * *
- VALVE * * *
- CONTROL CIRCUIT VOLTS 3120 I.D.# MS 106 AC/DC :DC TYPE 3 GATE
, OPEN CONTROL Limit SIZE 36" CLOSE CONTROL Torque BODY ORIENTATION Hori:ontal BREAVER :D135-D1NA INITIAL POSITION Close
- '
- MOTOR * * *
- FINAL POSITION 3Close RATED VOLTS / ACTUAL VOLTS: 125/132 *
- TOROUE SWITCH *
- RATED AMPS 39.4 OPEN SETTING 34.0 SPEED :1900 CLOSE SETTING :1.5 HORSEFOWER :1 080 LIMITER PLATE :N/A S:IRIAL # : r3 TS BALANCEABLE N/A
- TEST EQUIPMENT * *
- M A
- N.rRA.9E : ME 12.00-TMD ME 12.000 LOADCELL :N/A l AMP PROBE ME 10.010
- Test performed in conjunction with TP 850.52 i
Data Evaluated By: Al Wise Signature / Dater h h d M e q. y o. g
l l
l
. 1 TEST ID: 1-E6-37"4-01/MS106 By: APW DATE 10-10-S6 THRUST 3IGNATURE ANALYSIG MOVATS : TS-0C- TS-CO-DAVIS EESSE: TS-0C-145-09 TS-CO-145-08 STROKE TIME : O SECONDS STROKE TIME *
- 25.33 SECONDS
- BYPASS TIME : O SECONDS ~ BYPASS TIME : 5.71 SECONDS THRUCT AT CST 12004 # PROTECTION' MARGIN : 4.84 SECONDS SEAT THRUST AT CST: 10004 # UNSEATING TIME : .87 SECONDS AVE RUN THRUST : <PRELCAD AVE RUN THRUST -: (PRELOAD
- '?- 7U!
- T';3UST PRELCAO MA 't 3UN THgeST : p g gt,, A INERTIAL THRUST 11 % UNSEATING THRUST : 5177 #
--TAL THRUST 13546 # THRUST AT CST : N/A l
1 TOROVE SW. SE TING: 1.5/1.5 TORGUE SW. SETTING: 4.0/4.2 'i ih,'
l i
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I
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i .
V/0 1.562e-1 Vy -5.530000e0 T/0 6.250e-1 TL -7.42e0 m
v, k y _ 6675#
~
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O O O MS 106 THD Open to C!.. e No Flow Test > -: -8',
V/0 1.562e-1 Vy -3.870000e0 T/D 6.250e-1 TL -6.21e0 i
i :
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p
'(
MOTOR OPERATED VALVE ANALYSIS AND TEST SYSTEM DATA PACKAGE VALVE :MS107 MWO # 1-86-3724-01 DATE 312-09-86
- * *
- SYSTEM * * * * * * *
- OPERATOR * * *
- SYSTEM : Main Steam TYPE :SMB FLOW :* SIZE 20 TEMPERATURE :* SERIAL # :166171 PRESSURE 3885 psid ORDER # 3370174C SAFETY-RELATED Yes ORIENTATION Vertical
- *
- ELECTRICAL * * * ***
- VALVE * * *
- CONTROL CIRCUIT VOLTS 2120 I.D.# :MS 107 AC/DC :AC TYPE : GATE OPEN CONTROL : Limit SIZE :6" CLOSE CONTROL : Torque BODY ORIENTATION Horizontal BREAKER :BF1124 INITIAL POSITION:C1ose
- * *
- MOTOR * * *
- FINAL POSITION 3Close RATED VOLTS / ACTUAL VOLTS:480/485 *
- TOROUE SWITCH *
- RATED AMPS 35.75 OPEN SETTING 34.0 SPEED 31700 CLOSE SETTING 2.0 HORSEPOWER :N/A LIMITER PLATE :N/A SERIAL # 3447012-RX TS BALANCEABLE N/A
- *
- TEST EQUIPMENT * *
- MAINFRAME iME 12.007 TMD iME 12.008 LOADCELL N/A Ow AMP PROBE ME 12.011
- Test performed in conjunction with TP 850.52 Data Evaluated By: Al Wise Signature /Date: [dh f p. p.qg
l l
I lO
'IEST ID: 1-86-3724-01/MS107 BY: APW MTE: 12/09/86
'IHRUST SIGNMURE At& LYSIS MOVATS : TS-OC- TS-CO-DAVIS-BESSE : TS-OC-147-16 TS-CO-147-15 STROKE TIME : O SECONDS STROKE TIME : 30.02 SECONDS BYPASS TIME : 0 SECWDS BYPASS TIME : 8.23 SECONDS
'IHRUST AT CST : 21921 i PROIECTI W MARCIN : 6.73 SECONDS l SEAT 'IERUST AT CST : 21921 i UNSEATING TIME : 1.5 SECONDS AVE RUN THRUST : <PREIDAD AVE RW 'IHRUST : <PPJ!IDAD MAX RW 'IERUST : <PREIDAD MAX RUN 'IHRUST : <PREIDAD INERTIAL THRUST : 3% WSEATING 'IHRUST : 9199 4 O 'IDIAL 'IHRUST : 22560 t 'IHRUST AT CST : N/A
'IORCUE SW. SETTING : 2.0/2.0 'IORQUE SW. SEITING : 4.0/4.0 0
- O O O ...
TEST IDENTIFICATION: 1-86-3724-01/MS107
- IO7ATS S'IORAGE :
DAVIS-BESSE S'IORAGE: 147-15 PWF NO.1
'IMD AND SWI'ICHES: CIDSE 'IO OPEN i
STIORE TIME : 30.02 SECONDS AVE RUN 'IHRUST : <PREIDAD MAX RIM 'IHRUST : <PREIDAD BYPASS TIME : 8.23 SECONDS UNSEATING 'IHRUST : 9199 #
LMSEATING TIME : 1.5 SECCROS 'IHRUST AT CST : N/A
- i PRDIECTION MARGIN : 6.73 SECONDS 'IORQUE SN. SETTING : 4.0/4.0 E E 3 3 3 y 5 I V/O 1.000e0 Vy D. e-7 T/0 5.000e0 TL -4.096el V/O 2.500e0 Vy D. e-6 T/0 5.000o0 4
TL -4.096el Vy -
E
. . JL.A. . . .
I i
- i l
- . . . . . . . . l TL Vx 4
4
O O O .-
'IEST IDENTIFICATION: 1-86-3724-01/MS107 .
MOVATS S'IORAGE : ,
d DAVIS-BESSE S'IORAGE: 147-16 PIDF No. 2
'IMD AIO SWI'ICHES: OPEN 'IO CIDSE 3
STROKE TIME : O SEC0tOS AVE RUN 'IHRUST : <PREIlmD
$ MAX RtN 'IHRUST : <PREtimD BYPASS TIME : 0 SEC0tOS 'IHRUST AT CST : 21921 #
SEAT 'IHRUST AT CST : 21921 #
INERTIAL 'IHRUST : 3%
'IORQUE SN. SETTING : 2.0/2.0 'rorAL 'IHRUST : 22560 #
V/0 1.000e0 Vy O.e-7 T/0 5.000e0 TL -4.096el '
I
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NED 87-30028
"' February 3, 1987 INTRA. COMPANY MEMORANDUM File 9365 EO 4218 2 EEC 87-0025 P r.OM P. N. Car SUBJECT Differential Pressure Testing of SW 1380 SW 1380 was included in the MOV differential pressure testing program as part of the MOV Reliability Improvement Program.
The valve is a 4" gate valve which is a service water strainer blowdown. In operation it normally cycles several times a day as debris builds up on the strainer. It operates near its design differential pressure of 142psig.
The observed thrust for SW 1380 agrees with the manufactures
- calculations and the valve operates satisfactorily against the differential pressure at a torque switch setting of one.
Apparently the valve does have some minor internal condition which cause the signature to exhibit an unusual moment of reduced load. This is acceptable for operation, and will be investigated at the next opportunity.
PNC: mal ec: Nuclear Records Management i
r i
l lO l
~- . . _ . .
MOTOR OPERATED VALUE DATA COMPILED FOR DAVIS BESSE NUCLEAR GENERATING STATION ON JULY 30 1986
_______________________________ u._
TEST ID: 346-071686-SW-1380 (Del ta P)
XXXXX SYSTEM XXXXX XXXX OPERATOR XXXX SYSTEM : SERVICE WATER TYPE : SMB FLOW UNKNOWN SIZE : 000 TEMP : 70 degrees SERIAL NO. : 162108 PRESS : 92 PSI ORDER NO. 3663218
~
SFTY REL'D: YES ORIENTATION: VERTICAL XXXX ELECTRICAL XXXX XXXXXX UALVE XXXXXX CONTROL C1R VOLTS: 120 I D. NO. .SW- 1380 AC/DC : AC TYPE : GATE OPEN CONTROL : LIMIT SIZE : 4 INCH CLOSE CONTROL : TOROUE BODY ORIENTATION: HORIZONTAL MCC : BF1275 INITIAL POSITION: CLOSE SW. SENSING CIR. : VOLTAGE FINAL POSITION : CLOSE XXXX TOROUE SWITCH XXXX XXXXX MOTOR XXXXX OPEN T.S. SETTING : 4.0/4.0 VOLTS : 480/500 AC CLOSE T.S. SETTING: 1.0/1.0 RATED AMPS: 0.95 LIMITER PLATE : 4.0 SPEED : 1725 TS BALANCEABLE : NO HORSEPOWER: .33 i
XXXXX TEST EQUIPMENT XXXXX l LOAD CELL M : N/A--N/A AMP PROBE N : SIMPSON(200) ME12-3 -
MAINFRAME N : ME12-007 TMD # : ME12-000
ANALYS!S REPORT PREPARED FOR DAVIS BESSE NUCLEAR GENERATING STATION NMS#M fbf[f6 TEST ID: 346-071486-SW-1380 (Del ta P)
XXXXXXXXXXXXXXX THRUST SIGNATURE ANALYSIS XXXXXXXXXXXXXXX MOVATS : TS-0C-93-06 DAVIS BESSE:
TS-CO-93-07 TS-0C-203-12 TS-CO-203-13 De s 5; C1cu Tsu s %.&r ke, /1 STROKE TIME : 37.6 SECONDS STROKE TIME : 37.9 SECONDS BYPASS TIME : 0.76 SECONDS BYPASS TIME : 9.58 SECONDS THRUST AT CST : 3115 N' 9JG PROTECTION MARGIN 3 -9r44 SECONDS 8f# 6 '
i SEAT THRUST AT CST: 1529 # UNSEATING TIME : 6.44 SECONDS AVE RLtd THRUST : 1145 # AVE RlN THRUST : 1487 #
MAX RLN THRUST : 1760 # MAX RUN THRUST : 2782 #
INERTIAL THRUST : 0 % UNSEATING THRUST : 2002 #
OTAL THRUST : 3115 # THRUST AT CST : N/A TORQUE SW. SETTING: 1.0/1.0 TORQUE SW. SETTING: 4.0/4.0 XXXXXXXXXXXXXXX SPRING PACK CALIBRATION SIGNATURE ANALYSIS XXX X X X XXXX X X X'-
MOVATS STORAGE : 48-05 DAVIS BESSE STORAGE : 203-07 K-FACTOR: 3500 N/V ' PRELOAD: < RLNNING LOAD XXXXXXXXXXXXXXX MOTOR CURRENT SIGNATURE ANALYSIS 4
XXXXXXXXXXXXXXX MOVATS : CS-0C-93-08 '
DAVIS BESSE: CS-CO-93-09 CS-0C-203-14 CS-CO-203-15 STROKE TIME : 37.78 SECONDS STROKE TIME i : 37.24 SECONDS i PEAK INRUSH : 2.17 AMPERES PEAK INRUSH : 2.02 AMPERES AVE. RUN CURRENT : 0.57 AMPERES AVE. RlN CURRENT : 0.56 AMPERES l . RUN CURRENT : 0.6 AMPERES MAX. RUN CURRENT : 0.58 AMPERES TING CURRENT : 0.91 AMPERES END CURRENT
- 0.69 AMPERES !
i i
- _ - _ . _ _ _ _ _ _ . _ . _ ~ _ .__ _ _ _ _ _ _ _ _ .. -_ _
l ANALYS!S REPORT PREPARED FOR '
DAVIS BESSE
, NUCLEAR GENERATING STATICN
,' ON JULY 30 1986 u
TEST ID: 346-071686-SN-1380 (Del ta P)
,, XXXXXXXXXXXXXXX THRUST SIGNATURE ANALYSIS XXXXXXXXXXXXXXX MOVATS : TS-0C-93-06 TS-CO-93-07 DAVIS BESSE: TS-0C-203-12 TS-CO-203-13 SI'ROKE TIME : 37.6 SECONDS STROKE TIME 37.9 SECONDS i EYPASS TIME : 0.76 SECONDS BYPASS TIME : 9.58 SECONDS THRUST AT CST : 3115 N PROTECTION MARGIN : 3.14 SECONDS
! SEAT THRUST AT CST: 1529 # UNSEATING TIME : 6.44 SECONDS AVE RUN THRUST : 1165 # AVE RLN THRUST : 1487 #
MAX RUN THRUST : 1760 N MAX RUN THRUST : 2782 #
INERTIAL THRUST : 0 % UNSEATING THRUST : 2082 #
TOTAL THRUST : 3115 # THRUST AT CST : N/A TORQUE SW. SETTING: 1.0/1.0 TORQUE SW. SETTING: 4.0/4.0 -
XXXXXXXXXXXXXXX SPRING PACK CALIBRATION SIGNATURE ANALYSIS XXXX X X XX X XX X X:-
MOVATS STORAGE : 48-05 DAVIS BESSE STORAGE : 203-07 i
K-FACTOR: 3500 N/V PRELOAD: < RLN41NG LOAD 4
XXXXXXXXXXXXXXX MOTOR CURRENT SIGNATURE ANALYSIS XXXXXXXXXXXXXXX l
MOVATS : CS-0C-93-08 CS-CO-93-09 DAVIS BESSE: CS-0C-203-14 CS-CO-203-15 l
i STROKE TIME : 37.78 SECONDS STROKE TIME : 37.24 SECONDS i PEAK INRUSH :-2.17 AMPERES PEAK INRUSH : 2.02 AMPERES
[
AVE. RUN CURRENT : 0.57 AMPERES AVE. RlN CURRENT : 0.56 AMPERES
. RUN CURRENT : 0.6 AM ERES MAX. RLN CURRENT : 0.58 AMPERES
- SEATING CURRENT : 0.91 AMPERES END CURRENT : 0.69 AMPERES t
_ . _ _ - , . . .. - ._ __._- _ ._._, . _ _ _ . _ . . _ . ~ _ . , _ . _ , _ . _ _ _ . . , _ _ . , . _ _ . . . _ . . , . _ _ _ , _ _ _ . . _
TEST IDENTIFICATION: 346-071686-SW-1380 (Del ta P)
MOVATS STORAGE : 93-06 DAVIS BESSE STORAGE: 203-12 PLOT NO. 1 TMD &c SWITCHES: OPEN TO CLOSE I
STROKE TIME : 37.6 SECONDS AVE RUN THRUST : 1165 #
MAX RUN THRUST : 1760 #
- BYPASS TIME
- 0.76 SECONDS THRUST AT CST : 3115 #
SEAT THRUST AT CST: 1529 #
1 INERTIAL THRUST : 0 %
TORQUE SW. SETTING:1.0/1.0 TOTAL THRUST : 3115 N.
i
} . . . . . . . .
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TEST IDENTIFICATION: 346-071686-SW-1380 (Delta P)
MOVATS STORAGE : 93-07 DAVIS BESSE STORAGE: 203-13 .
' PLOT NO. 2 TMD Sc SWITCHES: CLOSE TO OPEN-STROKE TIME : 37.9 SECONDS AVE RUN THRUST : 1487 N t
MAX RUN THRUST : 2782 #
BYPASS TIME : 9.58 SECONDS UNSEATING THRUST : 2002 #
UNSEATING TIME : 6.44 SECONDS THRUST AT CST N/A PROTECTION MARGIN : 3.14 SECONDS TOROUE SW. SETTING: 4.0/4.0 i . . . . . . . ,
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TEST IDENTIFICATION: 346-071686-SW-1380 (Delta P)
! MOVATS STORAGE : 93-08 i DAVIS BESSE STORAGE: 203-14 ,
MOTOR CURRENT & SWITCHES: OPEN TO CLOSE STROKE TIME : 37.78 SECONDS PEAK INRUSH : 2.17 AMPERES AVE. RUN CURRENT : 0.57 AMPERES l MAX. RUN CURRENT 0.6 AMPERES
! SEATING' CURRENT : 0.91 AMPERES wtTcu . . . . . .
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2 TEST IDENTIFICATION: 346-071686-SN-1380 (DeIta P)
MOVATS STORAGE : 93-07 DAVIS BESSE STORAGE: 203-15 PLOT NO. 4 i
- MOTOR CURRENT & SWITCHES: CLOSE TO OPEN i
STROKE TIME : 37.24 SECONDS PEAK INRUSH : 2.02 AMPERES I
AVE. RUN CURRENT : 0.56 AMPERES MAX. RUN CURRENT : 0.58 AMPERES END CURRENT : 0.69 AMPERES a
i, 1
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NED 87-30019 GATE Janua ry 26, 1987
]NT,RA OMPANY MEMORANDUM File: 9365, TP 851.27 9
EEC 87-0016 File F s40M P. N. Cart, Senior Nuclear Engineer sugJECT PORV Block Valve (RC 11) Differential Pressure Testing 4
Toledo Edison's PORV Block Valve (RC 11) was included in the Motor Operat-ed Valve Improvement Program and full differential pressure tested in i
conjunction with the PORV test (TP 851.27) on December 7,1986.
i The valve was shut from full system pressure of 2150 psi with the PORV open. Th:re were no observed problems. An absolute torque value was not i obtainea due to inaccessibility of containment during the test. This l prevented use of the MOVATS equipment at the valve to obtain the thrust
! data. However, the valve performance was monitored from the breaker i (BE 1602) using the NOVATS "MCC" unit. Prior test data verified that the torque switch trip was 7795 lbs thrust at a setting of 2 on the dial.
- This equals to a maximum torque produced by the operator of 94.7 ft/lbs iO (valve stem factor = .01215). This was more than sufficient to close the valve under the test pressure. Analysis of the MCC power trace indicated that there was approximately 40% margin to torque switch trip when flow was shut off. This corresponds to about 60 ft/lbs of torque needed to close the valve against a differential pressure of approximately 2150 psid.
Copies of the data sheet and MCC power and switch signature trace are attached.
4
- Although the valve closed off flow against the 2150 psid it was noted that i
there is a problem of leakage through the valve. There appears to be a
- problem with the seats or guides which prevents closing the valve leak
- l
, tight. In the full differantial pressure closing trace', it is noted that '
torque switch reset af ter tripping. This indicates further movement of l j the wedge. The valve, although closed, was not fully seated. '
4 Subsequent testing of the valve using the "TMD" on December 9, 1986 l further confirmed an internal problem with the valve. The torque switch i setting was increased to 2.75 (the maximum allowed) and the valve cycled d
with the PORV closed. Leakage was still evident through RC 11 as well as ,
the PORV.
i Plans are being made to replace RC 11 at the next refueling outage.
l temp 2 e/546
- NOTE: Leak rate less than 0.3 gpm.
j cc:
Nuclear Records Management i
1 i
O t!QIQB 6000 EIGNGIWBE ONg(Ygig VALVE RC11 i
MWO # :1-86-0317-00 !
DATE 312-07-86 I LOAD REQUIRED TO OVERCOME DIFFERENT .4L PRESSURE: 4889 DELAY TIME: 55ms AVERAGE CLOSE THRESHOLD VALUE :
- AVERAGE CLOSE MOTOR LOAD VALUE: 2.71v AVERAGE OPEN MOTOR LO'D A VALUE : .185v REASON FOR TEST / COMMENTS: Support TP 851.27, to ensure valve operates at design conditions. This test was performed at pressurizer temperature and pressure.
- Signature went oH scale, threshold value could not' be determined.,
l Data Evaluated By: Al Wise Signature /Date a i
0
MMC Unit CLOSING SIGNATURE TRACE RC11 for TP851.27 December 7, 1986 Full Differential Pressure 1
Torque Switch Trip j '
Margin-40% .
V/O 1.000e0 I. Vy O.e-7 l -
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O t!QIQB 6000 BIENGIWBE 8NGLYSIS VALVE :RC11 NWO # :1-86-0317-00 DATE 12-07-86 l
LOAD REQUIRED TO OVERCOME DIFFERENTIAL PRESSURE 4889 DELAY TIME: 55ms AVERAGE CLOSE THRESHCLD VALLE * . , ,
AVERAGE CLOSE MOTOR LOAD VALUE 2.45v AVERAGE OPEN MOTOR LOAD VALLE. s .174v .
REASON FOR TEST / COMMENTS: Support TP 851.27, to ensure valve operates at design conditions. This test was performed with no l DP.
io -
- Signature went of f scale, threshold value could not
- be determined. -
i I
i O Data Evaluated By: Al Wise Signature /Date :
l 1
' i [ '
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I MCC Unit Opening Signature Trace RC11 for TP 851.27 December 7, 1986 Zero Differential Pressure V/O 1.000e0 Vy O.e-7
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eE3862_and_eE3820_Iestics
- I. Summarx
.The testing of AF3869 and AF3870 obtained the information needed to confirm thrust versus differential curves and demonstrated that they are able to perform at the design differential pressure requ' ired.
II. Discussion
.n
- N.]
! The pressure, flou and thrust data was reviewed and compared to the calculated forces to close. The observed thrust to close AF3869 at both 450 and 1200 psid uas less than the amount calculated using the vendor's " Limit orque equat ion".
i The observed thrust to close AF3870 uas about 10% greater at 450 psid and 1100 psid than the amount calculated using the same equation. 1 This is attributed to increased packing loads or minor internal differences in the tuo valves. This result was not unexpected, since it uas observed in prior static differs.ntial pressure testing. During the test, the valve did not fully close at the higher pressure. It was open sufficiently to still allou about 40 to 50 GPM of flou. The
(- pressure curve for this valve was developed
()} thrust versus differential by taking this point and adding a margin in proportion to the valves at 450 psid. From this curve it is found the valve AF3870, at the
f'
- rg -
IU j present torque suitch setting, is capable of closing against a differential pressure of 960 psid.
a t
No unusual flou noises or water hammer was observed during the feed testing. The background noise levels in the auxillary pump rooms -however, made it difficult to hear very small noises.
i Both valves opened smoothly at the tested differentials. The opening l
~
thrusts observed were well within the valve and operator capability.
I i
! III. CQDclu11QQ
!O Valves AF3869 and AF3870 required operating thrust versus differential
]
4 pressure characteristics have been determined. Although AF3870 values l
i j ore higher than the vendor's calculated value, it is not significantly different. Both valves can open against a design differential l pressure of 910 psis, and thus, are able to meet the design 1
i requirements as given in NEP-092.
Gilachmt011 1
1 l 1. AF3869 Differential Pressure curves 2 AF3870 Differential Pressure curves i l l
3 Movats traces
- 4. NEP-092 Data Sheets 5 Attachment 1A from NEP-091 l
1 6. Sushil Jain Evaluation
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869 Mf DP. full flow i ,22/86 open to close "
1 V/0 6.250e-1 i
Vy:-3.750000e0 l
= - - - m T/D 1.250e0
~
4145f. 24.25 sec. / TL 2.806el 1
i ;
1 i
l 11920f 25 sec.
r
., 12558# 25.33 sec. flow stopped i %
~
7 14154#, 25.82 sec. -
l 14269f. 26.75 sec._ .
_ torque switch trip ' r 2
_ 16503#, 26.86 sec. -
-i^ ' '~' '
^ '
']
i 1
i 3
i i j i 4 e ;
1 t
.i
~
l t
] O DP test 26.29 sec. 14328#
l e e
i a A A R R R R TL Vx i
l l
t I
-3869 .
as to close 450 DP. full flow
, 10/22/86 V/D 6.250e-1 Vy,-2.440000e0 l
) T/D 1.250e0 TL 2.754e1 1 -
i mm ._ a - .AAa * -- _a a
4031f. 24.12 sec.
~
1 7 4114f. 24.64 sec. ' '
' ' R I '
! 5857f. 25.15 sec.
l 5884f. 26.7 sec.
i _
i I
i I
4 14183f, 26.39 se'c. torque switch trip !
- =
L:. .. : . -- .. .. . : l l
{ 16646f 26.% sec. l 1 .
I I e t E I a t j, TL Vx i -
4
\
3870 10# DP. fell flow
.s/22/86 open to close 1
V/D 6.250e-1 Vy;-3.260000e0 i T/D 1.250e0 i
TL 1.416el 1
i . I l -
,- 4142#. 22.71 c. V/0 6.250e-1
_ 39sta. 22.39 .ec. Vy -3.260000e0 i
. T/D 1.250e0 y TL 1.416el 13236# 23.36 sec. torque switch trip N . . _ _ _ . _
e I
j _
13638f. 23.4 sec.
l 3
i^ l i .
j TL Vx ,
I,
873 j Mi Dr. full flow j s/22/86 i clo.e to open t 3
g . . . . . . . .
. 23.43 e. .cra.
V/D 6.250e-1 Vy.-2.270937e0 1
1 T/D 1.250e0 1 573#, 3.62 ..c.
TL 1.079e1 I 8527f, 1.32 sec. \
l
- 9641f. 1.78 sec. -
N i
i i
l Vy -
_ , t _- J L. , , _ . . _. . . . _ ,_ ,_ _ _ . ..
l t
- e
(
8 r ,
4
,w- - -
- 3 I t t R R R i R j TL Vx 1
O O O
-3869 12004 DP full flow close to open 10/22/86 V/D 6.250e-1 Vy.-2.111562e0 T/D 1.250e0 TL 5.71e0 7655#, i.72 m . i .295e. 3.a3 c.
7317#. 1.63 sec.
N ^ r._ -
Y,v -
- L- ..
41-74 f t
~
l 1
a.. .
I R R R 3 g g g TL Vx
o
-m g#DP.fellflow O
/22/86 -
l open to close
! i 1
l 5 5 5 5 5 5 5 5 V/D 6.250e-1 i
l _
Vy.-3.060000e0 l 1
I
, T/D 1.250e0 ,
- 3820#, 21.36 acc. TL 1.301e1 1
j 4377#, 21.82 sec. -
22.26 sec. 7308#
{ vy -
_ _- _ y I
.i 80597 22.72 sec._
l j
8193#. 24.14 sec. e T~
I
'l 13424# 24.3 sec. torque switch trip * '
{ . . _. .
l
! - 14255#. 24.34 sec. /
e e
I
- l
{ TL Vx .
i
' , . - ~
r -w c. u- w ers P o. t t S -Q - 9 2.o . A se
! ATTAC1DfENT # 1A b#4 /)
Noter Operated valve (H0V) Design:
N .us ; w.w: .
l l .
Valve No. (TED)_ A r3t.c .g A r,pg3 l Hasufacturer: k/Ad- Mo uf4/- do*' '
i .
.i Valve Drawing No. (MTR): 8 -#. f f/7- 4 I8 ,
Stes Material: 4 473 W #4' 4 /4 -
\ -
Dise (Trie) Nat*1 /b 2/d d*/ AftLS 1447W .frfstift d 4 n g' p r & t.p d .5 nody nat'1 A. /4 &f WC8 sssn m son , ofa 9 i
Sten Disseter-Minimum (inches) /b Stes Thread Diameter (inch)_ //
Sten Pitch (inch / thread) //4- 6ad(No.ofThreads) //2.
C AA I j
Valve Serial No. 64 2 gitOA .
2s/24V 7snv 1*LtEV7 Actuator Serial No. asc/t c / ,,p g Rated Temperature (F) '9 0/
- Rated Pressure (Psig) /3[I ' N#
- Rydrotest (Psis)-ledy 2/76 Seat /60 0 Differential Pressure Test W/0perator - Psig ' /.9 00 Valve Stes Thrust (or Torque) Required to Actuate:
iO "
J A. At Ambient Tegerature and fue Pressure l
- 1. To Close-LBS (or FT-LBS) /800 / 85- Z /d N I
l .
- 2. To Cpen-LRS (or IT-LIS) /f## A 85. T /0$ ,
l 3. At Rated Temperature & Rated Pressure *
) - ,
- 1. To Close-LBS (or FT-LBS) /I 63 ~7 488 ' f/ CI
, 2. To Open LBS (or FT-LBS) /f 53'7 / 85. ? /d M i
i f +, . C. At Rated Flow conditions
- 1. To Close-LIS (or FT-LSS) A.//4 l 2. Te Open-LRS (or TT LBS) A)/A i
{, .
. Maximus Sten Thrust at which point the weakest Valve Member will yieldi~ ;
i a.' la the Close Direction (LSS) /eh000 the Weak'est Member is O er4*** //oxe+ '
8s t.T we iO I
- - 2 *6 aP at ti - (ti$) 22aa=
the weakest ne.ber is Woost "sinas" l- ,h afh . matamina n /4 B%.4 < w
/z 4 4 4' 6,vre l
i fr u(,mme
1 N070R OPEsATOR CA1Ctb710NS P.O. NO. OR PROJEC7: PA W 3 M isf- RIT.:
i Cus70xrR xAxz:
O vt1 , ,0.,
70Lf00 EDISCM inx,, a r.2,7, o u , . ,0.,
vu vt ers:: A ' tis. cAft r LINI PRISS: 9/O P$1 0=.IT. DlA.: _ S. CRIP, M u _28.37 AP 9/C *y, 781 ( TD9.___
$7EM DIA. : /.5 sm REA: I.77 TE: P_ L L177: "
STEM THRUST: 0.A. a a? a SEAT TACf.: 2A 27 s 3 = 77/E I 12NE PRESS. I 8. A.
- a f.7 7 e 14ii RUN THRu$7 e 183, Pecking Tracties Lead 'e /Soo RUN TORQUE: FT. 185. Total staa Thrvst iosz9 h
) $7Dt 70RQt.T = STEM TERUST STIM TACT. _ICB2 9 s .OfRf a 2 m (/, (, 'l bg 0/A OR UNIT RATIO
- h070R DESICW R.P.M.
$7m $ PED IN./ WIN.'
. e e Yk j 75t h D LEAD 5f. 8
/
HOTOR CALC. TORQUE
- 87DI 70R00E e 2 o (4. (,,
PULL OUT ITT. s APPL. FACT. a 0/A AATIO ,9 s,9 gg,p
' O' $ 9 l H070R CALC. TORQUE f ADOCD TOLTACE =
- 10, IB a l2. 72 *(
- N07. STALL TORQUE a ST. ETF. I a 0/A RAf!0 e 0 1102 TOLTAct a a a a 'g E/W PUL.L e - 2 s $7DI TOROUE e is j . g R/V RAT 30 a 91111 U7. a R/V D1A. s a MAX. 70RQ. SW. $ETTING 8 MOT. TORQ. a P/0 IFF. a APF. FActot n 0/A RAfl0: i (fRD. VOLTACE) a .s a a a *f j MAX. 5/WitIEL 10145E
- MAX. TALTE 700flWI R/W RATIO a us.
e
- *(
OPDATING TIME * (60 : LIFT) 4 STEM $PRID = $300198.
l OPERATOR VITE Ft.f N0105. M41.15k9878 -8 MAX. STDI 703qqt e 'i 0/ABATIOBANGE8 5/W RATIO a il ARD sta 11 NLI. STEN 914.8 CURnDrf SUPPLY _
10LTs _
C MIST OPERATE At M TA8E
- 4 1591 1 2 3 4 3 0 1
COMPILD BT C. N I)
APPROVD BT: 4w. N __
I IND . 129.31: 4sp
- 13 11 14, RET. 1
=. muinum 4
CALCult TION SHEET
.i ta tieto STCteON/W Net C A L C W L A t eO.e 40_ mt vegiose 40. I bAV!s- BdSSE
- I '
c-mE- 50 03 lol / l u tet C T gng g g No, Q NATOA Aux /~ 6EDo</476A. :6YS T6M oaf t CM(Cato 29 , 2')
bkhj% Jo-29-ft gy g '
CAft jfg g f
NEP-092 EXNIBIT II D/F L1MIT REVIEM
SUMMARY
Racoan i
SYSTENt.S;$.gg).yerk@. A VALVEos AF.386,M 3870,AF.3871, AF 3872 CA E 0AY:/$~
PROVIDE WITTEN SUNNARY OF CONTROLLIM D/P LINIT NS VALVE (s)
S& SED ON CAIAULATION OF D/P LIMITS. ATTACH CALCULATION.
A. NAXINUN 0/P Pot VALVE OPWIM: 910 P5lD P2 & b .6.L.!.44 M.iliL: h . M M "O
- d M d _.4. M .
) yd g ,d d f .6.6. M 1 W 20Ww # h khM .fr/c.f N. $ .
O v_e a, ate
- .qQ$ 7vt.Gw
- . o ASI (s.
.9A91!.17466 M SL8 A'd _ = = _ ...
- s. NAX! NUN O/P FOR VALVE CIASIM ...... h.d.. b .. ... ........
......... . ... .... - .... - =-- =. - -.... ~ ......
l
. . . _ . =- ---
l .%k W ACP ND h Lo&Apyh,tL%r=-Ig_%D1y_.. .. ....
W&as~._$G A+tU.*J.,_0 A'*Mfl7't A313 _
_ __ =_= ,
C. CONfp0LLI M D/P t l CIASIM (B abovel (K 1 OPWIM (A above)
BAtt8t.M4e b ofim /AhiLd_ Akg Wudv ArVI1tte4 __
,O u v
..w.4 .s..4%dS
. cr..MLW-..= = = = - --
= _ --
. . . . . . . M e. _ ..M. . M. .. M N.. N. N.. -~ # C -- - '- #M"
. , _ _ . _ - _ _ . . _ _ _ _ _ _ , _ _ . . , . - _ _ . - . , . _ _ _ _ . . _ - _._m._. . , - _ , _ _ _ , . . _ . - - - - . . _ , , _ _ _ - - _ - _ , _ _ - _ _ - _ . _ - - . - . . - _ _ _ - _ _ _ . . _ . _ , _ _ _
,,, ;ev, e-- w c. v.3,,
EDISON str.ogr. txxisti tit category No: '5 C.AL,CULAflON e tei. SHE( f
- 8TATloseN astt tattvtatsees %
O ,,, ,g -
cavis n,ss, unit i c mt-99 99-do2. o
'w'dt Torin or Flow for Review operation of Valve Limiting Conditions for 4 Testing of Precevre sasat a wooiwaton omit casca e pg ,, Jg kcuSL Y R*5~@L ppf, h q )$
g4 Do test conditions or limiting D/P conditions exceed vender ating? Yes X iso If ves, identify valve No.(e). - ~
3 Valve valve operator T No. Stae Type Manufacturer falve/Oper.
Manufacture Sise Available E Deslan D/P hating M IN forque Ft-Lbe. PSIC 'F i f/6 6 CAft l% W 61.L tlMITO4 SUE [N 826 1300 3ol
! 2 dYo 6 CATE fDWE L L LIMITotAuf j0$) W25o l3oo 3o;
)
$E3r G cart POWEL L. LIMIrot9UC &".'. *@ 8 ?.(,, 1500 3cl
^
6 Nin. G GAtG IbW6LL UMl1'olGui ll"%= 82L D300 30l s Af.360 6 CAff pow 6L L LimtyddellE o'.".% M 236 1300 3 01 s Af.386 G GATE POW 6LL LlmtTOgbyi a & ~* Iof $ l300 O ,
30l e
e io % D C. Merot - 15/r ib 512E il il Va he Valve / operator tietting Conditten No.
feet Categorisation f For Destan leview 4 Test Categertaatlee i E D/P Flev Direetten b.,,gsur, Beqvtred Desire ;
M forque Aatte Achievable fe le tested PSIC CPM Close/Open' Up/Deve Torque Avail./ Req. Test Flaat fee /De Stress Ft.Lbs. Method lende i 3$ loSo w/A opc4 iosofo 2310 3 56 nywo r YE5 *
- 8 3% lo.50 N/A O PC4 fos [/c 1317 l.08 HyMo 5 YES n *
> A'7; foSo N/4 cP64 'loSo/o 2310 3.5 L HYMO S YES M-I
- g~t 10$0 N/A occ6) 1o50/0 2.32 0 3.56 HYMO 6 W5 H snr.36 s 400 600 cl.oK L<oolo 106 0 22} l' Low S YES M i s W.38t 400 Soo cloSE L400/o los.O I0 05 flow 5 YEs%M%
Mt 6H C of F put. Vht.VB 7084 T'Esrdo '
- y)(W out.af Twoytwt3 Tot C Tssrt b to II l l _ _ _ _ _
l
' ~ '
- s. se Ho lIS-Q 92.o1 j A77AC10ftNT d 1 A I^hm/)
Noter Operated Valve (N0V) Design:
' A r U 9 % .=.s n t j .
Valve No. (TED) A/~t... /Apfg3 Neaufacturer: WM. Ao WZ4L $0*' j'.Y r :
Valve Drawing No. (MIS): 8 4. $ f/7- M ./8 ,
9 Stem Naterial: A $73 19ff' 4M '
1 Diet (Trie)Nat*1 J$ *~'/d' 6"/ MCS /A//7W .frut/td* d4 by fjard,5 i
i Body Nat'l A O/4 t';;f ycg stan faerom ,o/39
- Stes Disseter-Minimus (laches) /k Stee Thread Diameter (inch) //
StenPitch(inch / thread) /M- 6ad(No.ofThreads) //z I 4^ ^'-^
33/2W F v 11L/EV'/
Valve Serial No. M- Actuator Serial No. an/t.e'/ a. -
.ufg %
j Rated Temperature (F) .90/
- Rated Pressure (Psis) /E((l#
- Rydretest (Psig)-Body .'?/ 76 Seat /SO O Differential Pressure Test W/ Operator - Pois */300 l
ValveSteeThrust(orTorgue)RequiredtoActuate:
- O 4. At A ient Te.,er.tu,e .ad sere Pressure
~'
- 1. To Close-LSS (or FT L88) /800 / 88' 3 /d N {
l j ,
- 2. Te Open-LSS (or IT-LBS) /f## 2 85. f /OI
'1 ,
- 3. At Rated Temperature & Rated Pressure
. p
- 1. To Close-LSS (or FT L88) / 2 6 3 */ 4 8 5 . t / 0g
!j '
2.
Te Opes LS$ (or IT LBS) /f SS7 485. f /d N
}
. C. At Rated Flev Conditions
- 1. To Close-Lls (or FT L88) /d 4 l
- 2. Te Open LS$ (or FT LSS) A/M l l ,
. Maximus Stes Thrust at which point the weakest Valve Member will yieldi' l s.' latheCloseDirecties(Lls) /e't'k000 l
4 the weak'eet Member is D Ptc=-r //oF+ 8e LT we
!O i
- . isise0,eaDire< ties (tis) 22 ..
the ve nest ne ber is Ufast " di m "
,h afig , ac:= iano a /4 2 / E F 4 C
/z4/N j,, to(Attas 64tw
C 4n A L.C.U. L A T ION $H L L T
$1 Q t sc hiy N ei E A % E W 4 A I 'O 4 880 mt vision h0
~
bAVis- B655E
- l C. ME. $0 03. lol / '
1 sutet C T SMt t t NO.
CJ nax. picoe<inre,r sr rem UNAtom OAtt CHICa40 2.s . 29
, OAtt A lv>L 3 M 10-29-[l SF Alt',
/f + A;
/ i NsP-ost EXHIBlf !!
on Liutt anvinu summany amenen 81stens A_ux..[gg.yg.rff.. VsLVseA .s .... .F'.3ElAs.h'.'.M
. .... ?0* AF' 3871' Al~-38 CA7d(=0AY : / $~
PROVIDE MIffEN SUMARY OF CONTROIA,lM D/P LINtf PCs VALv3(3) I i
BASED ON CALCULATION OF D/P LINITS. Aff4CH CALCUL&fl0N. l A. NAXINUM D/P POR VALVE OPENIM 91095f D ,
ba s stna .t.h_e e.k..w...iq<
= .l . ... L.e.sa.
- - - e.tw% so&_ J..G.t.s.J.nL...$.LL.b l
.v.a..u.e.. U ..... 6.
M... l<.t....t,.6. tst w s.h.........k.... stm . k.l.o.n..s.f./..c.s..a.c U v_& a,ll },e er[ h /N I>tb MP th.dskt h\clLt up 3)ud
. q. ,h..T.r.t.. E. k...s ... 0. A... D (s.
.n..._paen,-
w so, on . . . _ . . . . _ . . _ . _ = - .... . l
.. nx!NUM D/P = mv Cio.iM .....0.Lf_HP......._........
......... ... ._............... === .._._.............
- u. M e r e w a.e L ! s m n .n. a r. a s n % _ ........ .. . l
_P e t e _e.t.ku s 4 a ..JLu se . _ _ _ . . _ _ _ _ l C. COWfp0LLIM 0/Pt i I CLOGIN (8 abovel (K)OPENIN(Aabove) BASISt.h41L br olfy. (AAtLM._MULp WipIv' AN{ltil'# O " u v <
=
...i.4 2..d p.4.k.v.. M f.s.L _..... . .... ..... ..
......... _ .. ........ . .. - . ~ .. - ........._._--- 1
---- - ----- - -- - - - - - - - -{
...s -'
l '-- helve
.%~ EDISON str ou , m ia:T iii Category wx 85 Cg Af ton $Ht(T , -
statioww=st 8 8 6 8 W 6 * * * ** O Davis Besse Unit I c mf 99 99-co2. m o visie= me. o Sv'et form foroperatton or Flov Review of valve Limiting Condittens for 6 Testing of Pressure '"'"**' ~ cmioimaton oats C o.t C s 0 /f on 38 ke%b Y OAtt A*S*$$ . st). hC*ffs Cf .,fc % Do test conditions or limiting D/P conditions exceed vendor ating? Yes X No If ves. identify valve No.(s).t
~
'"3 " Valve valve operator 7 No. Site Type Manufacturer Valve /oper.
! Manufacturer Sise Available t _ Deslan D/P Rating Torque Ft-Lbs. M IN PSIC 't
^
3((q l t dyo 6 CAff PbW6LL LIMITO4GU6 o $ S2' 1300 3o1 6 LIMITOQllE Mi 8 CATE IDWL L L X250
~
)
1300 301
$l *i G Cart Poultl. LIMI70t9UE ["'.% 8 t(, I500 30l 4
3 M~r. _6 cars Powett uuivotAus fj"q- gzG 1300 3 01 5 AF 360 6 CAf6 90W64 L 8 M LIM 74RellE 07 % 236 1300 3of s Af.366 & GATL POW 6LL LiMITOR 0ul e M ** Io&S l300 3 01 O_> - a 9 I io % D C. MeTcR - 15/r ib SilE il il
; Valve 'Valve/ operator I,tetting Condition T No. feet Categorisation For Deslan_ leview & Test Categorisatten ,
t D/P Flow Ottection b Desire i Required forque Aatte Achievable M PSIC CPM Close/open' ressureUP/Deve to le fested l Torque Avell./ Req. Test Fleet Yes/De Strese _Ft Lbs. Method Ed: i 3fd 1050 N/A opt 4 loso/o 2320 3 56 ny3co r YE5 *
- s A'n 1o.50 ni! UPC4 foSite 13f.7 I 06 HVDR0 5 YE$ h k
~ily. ses o N/A 0964 *lo5o/o 231 0 3 5L HYbito S Yd 5 * * ;
a gn loSo N/A occal 1o50/0 132 0 3.54 HYD'LO 6 YES WW l 5 nr.3so 400 600 c t.03t Hoo/o 106 0 2 23 rLou 5 YGS
- H s
W.38t 400 eco clost 4 00/o 106 0 10,0 5 new S YGL M
*? sk. 0M, of p out, vhLVas ross w$rdo Q)& autof TWO VnLVEs 'Yot C ris rt b c
il Ii
,1. No70R ortsaton cuctuttors j P.o. No. on Pno.7tc7: DAVf3 M13E- ' n!F.t _- i CUs70.sn sAnt: 10lL00 E0lSCW vtLAN No.: 17tMs: 4f JAfr f , M//, 3472 V/.13! DtsC: 4" _ vnAN 090. WD. : , L35. _ CA71 e , l ORIF. DIA.: _ (, L1111 P1155: f/O Ps! ORIP. ARIA!_ 28,2 7 A P _ f/9 Pl! f TDIP. _ _ 'T. i STIM DIA. : _ /. 5 STDI AAEA: /,77 TD k L LIPT: _ STEM THRU57 0.A. a 47 s 8 TAT FACT.: 2817 ] 9/o aaJ
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't, A t t Nos.nber 5, 1986 ?*"'t A.C O M P A'J V MI M O R M.D U M
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RECElVED
- r. N. C.irr. Fenior Nuclear Engineer
, .7 SUDJs Cf S. C. J. In, ':oc h;ar I:ngineering DJ reetor gg) Mhfjggtffy r.ngineering 1:valuat jon of Valve Operators on Yalves Ar-3,%9, Ar-3870. Ar ', / l, and Ar-3872 rer your re <1oest , Nuclear Engineering h is completed an evaluat ion (.it t ached) of the subject valve operators. Based en this evaluation. Nuclear rngineering finds that the existing valve operatoru . ire adequate to meet the nystsm furctional requirements.
If you have any questions, please contact C. llenEge at Ext. 7172. SCJ / Call /n.is Attaehrent l cc: C. llengge l B. C.itrick l J. Ewald R. Elfstrom Nuclear Pecords Management i l l l e l l
{ 10
- IACINt1 RING IVAl.ttAT10N_
1ho Purpose of this evaluation is to determine the acceptability of the existing volve operators on valves AF-3869, AF-3870, AF-3871, and AT-3872. IUCHIPr10N OF PROMD1 I< cent H0 VATS tceting has dettrmined that a higher than calculated thrust may be required for valvo closure. Based upon the capabilities of the rotor operators for the subject auxiliary feedwater (AW) system valves and the results of recent if0 VATS testing of valves AF-3869 and AF-3870, it van deteimined that valve AF-3870 will successfully close against a differential presnuro of approximately 910 psid or less. During testing at 1100 paid, the valve failed to completely close pernitting approxiraately 40 rpm continueus flew. Fach of the subject valves has been successfully opened against at 1 cast 1050 paid. F.VAllf ATI,03 l The taximum potential differential pressure across valves AT-3869 through AF-3872 is approxtinately 1300 paid based upon valve operation against AW punp shutof f head at a 3600 rrm turbine speed. Valve operation under these potential conditions is discunned below: O Valve Opening - Frior to valve opening, dif ferential pressure across these valves can occur due to check valvo leaka,,4 resulting in steam generator pressure on the upstream side of the motor operated valve or AW pump operation pressurising the downstream side of the actor oporated valve. Engineering calculation #C-HE-50.03-101 has dettroined the enaxleum dif ferential pressure due to check valve leakage to be 910 psid. AN pump operation ceuld result in a dif ferential pressure of 1300 paid if the pump turbine accelerates to 3600 rpm prior to the valve lif ting f rom its seat. This condition is g,revented by design features which assure that, upon system actuation, an open signal is received concurrently by the turbine system inlet valve and the discharge motor operated valve. The design of the air operated steam inlet valve results in a delay of approximately 5 seconds from receiving the open signal until actual valve movement and admisalon of steam to the turbine (actual delay is determined by the setting of the needle valve in the air bleedof f line for the valve actuator). These design features assure the discharge valve will lif t of f its seat prior to the development of dif ferential pressure due to pump tutbine acceleration. Valve Closing - These , valves are normally aligned closed and receive open signals upon AN actuatlon. Valve closure under high dif ferential pressure conditions would require a scenario which ir.itially actuates AFPI en steam generator i followed by a complete depressurisation of steam generator 1. If, additionally, a single failure prevents the closure of valve AF-608, valve AY-3870 would O attempt to close against a potential differential pressure of 1300 paid. Concurrent with valve AF-3870 closing, velve AF-3869 is l opening to align AFP 1 to provide flow to steam g,anerator 2. The actuel dif ferential pressure across AT-3810 will decreate as flow through valve AT-3869 increases. l l
( V Testinp, at 1100 paid determined that valve AT-3870 would fail to cerpletely close resulting in a continuous flow of approximately 40 spm. The concern in the potential for continued AW flew to a faulted steam generator. With a steam line break inside containnent. l continued flow could result in overpret.surization of containment. 1his concein is bounded by an analysis in USAR Section 6.2.1.3.2 l which assuned 800 :pm AFW flow to the f aulted steam renerator for l ten minutes. peak containment pressure for this analysis occurred at 27 wconds af ter the steam line rupture. Continued flow to the f aulted steam generator will also result in reactor coolant system overcooling and a potential return to criticality due to the renulting positive reactivity inecrtion. This concern is bounded by an analysis in USAR Section 15.4.4.2.3 which assured main feedwater flew (at 135 percent of rated flow) continued to the faulted steam generator. The reactor core remained subcritical in this -scenario. Each of the above two cnnecrns (overpressurization and return to criticality) are inost sensitive to the rate of feedwater addition to the faulted steam generator. The expected continuous flow through Ar-1870 (approxtrately 40 Grm) would have negliSible istpact on either of theno concerns. O CONCt.Us10NS U Based upon the above, it is concluded that the existing valve operators on valves AF-3869. AT-3870. AT-3871, and AF-3872 are acceptable for the existing AW system configuration. This conclusion is based upon the verification by testing of the valves capability to open against at 1 cast 1050 paid. This conclusinn will require reanalysis if the system configuration is modified in the future (e.g. valves AF-3870 and AF-3872 aligned normally open). . prepared by <va Mom A 1(evicwed by p y. 7. hyh Approved by odd 'T N O N $ e I i mas 048 v i
l l i -i t i I .I l < Docket No. 50-346 ! , License No. NPF-3 l Serial No. 1357 Attachment 8 i i i i 6 t i [ l ATTACHMENT 8 f < FW601 AND FW612 DESIGN CilANGE s l 1 l l t L l i 1 l r { s i I f ? I l
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imatiatione l1s f Cm No agv. ld 'a ,;a *7,g.an g ,,ee,%88W 601/W 612_ Limitorque control Modification
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r Main reed 045-01 ' W 601 and W 612 s ev. . at: e.....c4 'ist i. sa va , : . m.se ava .;vis' Change the control of the Limitorque operators on W 601 and W 612 in the close direction from stopping using the torque switch to stopping using general limit switch. 5' **"**t' P 6' t
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5-:..e s,etas es rai ..ous e=4'.4 et s s oss 4 8t.a;'.8;&*tovtst The present design of W 601 and W 612 requires that these 18" Gate Valves be closed in 14 seconds. The resulting combination of a high speed limitorque O actuator and torque switch setting to overcome the design differential pressure resul}s in a high stress to the valve dise upon closure. This stress has resulted in cr) king of the stellite seating surfaces on the disc. The high loads are due to the 15 to 20 milliseconds delay between torque switch actuation and the opening of the valve motor contactors and due to the momentum of the disc and limitorque mass at the high closing speed. The contactor time delay can not be laproved without major up grades to the motor control centers. The Valve Stroke time and hence closing speed is set by safety analysis requirements and can not be easily modified. Finally, the ! torque switch setpoint (thrust) cannor be lowered without potentially af facting the ability of the valve to close against the limiting design dif ferential pressure. Therefore, the limit switch will be used to stop the motor prior to the disc contacting the seat allowing it to " coast" into the seat.
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- 1. EuCQQ5t t
This FCR will change the closing control scheme of the Limitorque operation for FW 601 and FW 612 from using the
, torque switch to using the geared limit switch to open the ; motor contactors.
1
- 2. StittfcGRE
- a. MP1410.32 Testing of Motor Operated Valves using MOVATS 1
< b. MP-1411.05 Maintenance and Repair of Limitorque Valve ,
i Operators SMBO through SMB-4 ' ] c. NEP-091 and NEP-092
- d. ST 5031.07 and ST 5031.00
- 3. DellGo_DenGCiGilGo l
This FCR will affect the Limitorque operator control schemes i for FW 601 and FW 612. It involves a wiring change to the i i actuator internals which places the close torque switch and one of the geared limit switch contacts in series to provide limit switch control for closing. The valve is ASME Class !!. l however. the ASME aspects are not affected. The valve operator is Class 1E, ED and seismic. However, j this change has no of f act on these design aspects. The valve operators are located as follows: l FW 601 - Room 314 #4 Mechanical Penetration Room FW 612 - Room 303 #3 Mechanical Penetration Room j This modif1 cation does not involve any significant physical ! changes but involves only internal wiring. This valve j operator circuit receives signals f rom SFAS, SFRCS, Control Room and Local Control Stations. l Drawings: 1 j Elementary - E449, Sheet 44 and 49 lg Scheme - E557A. Sheet 40B p 1 uh 7[7/65
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2 q 1; b'-6 i . 4 EwaGlisaal_Stauittetats The functional requirements of this modification are that the l linit switch must be set to open the close contactor in sufficient time to prevent the momentum of the high speed actuator and disc assembly (rom over stressing the disc, yet be set so that the valve disc stops in a closed seated position.
! The torque switch will be in the circuit and set so that > suf ficient thrust is produced to close against the maximum differential pressure, yet will actuate to prevent major valve or operator damage due to a mechanical failure.
Note: Should one limit switch fail, some minor disc damage ! will probably occur as previously experienced, but the torque switch will prevent severe damage.
- 5. Quelitx_essutaast This modification is Nuclear Safety related.
1
; 6. lastellatigo Installation of this modification will be accomplished using approved Maintenance procedures f or wiring and f or Limitorque q(_j Operators.
The initial setpoint will be established by an FCR testing 4 process conducted on one valve utili:ing the MOVATS test equipment. Data from this testing process will be used to establish the final design setpoints and to analytically confirm the ability to close against the design dif f erential pressure and flow. i
, 7. Icg1 Lag Final testing of the modification will be accomplished using the MOVATS test equipment. The valve will be stroke tested to ensure it meets the criteria of ST 5031.07 and SFAS and SFRCS signals are to be applied to be sure that the valve will actuate.
- 8. Sytygillaggg_aQd 10: Sit %1GR_lusQtEt1GQ i This aspect is unchanged.
- 9. UtlQttQAQGt
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, V. This aspect is unchanged. gC# pm p/e,
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- 10. EdittYa Stillb_AQd_StGWC11Y This aspect in unchanged.
l ! 11. Symeo_Eestocs . r i The closed light indication is also controlled from the
- geared limit switch. Illumination of the closed light will j be positive indication of valve closure as is done for i quarter-turn valves. For most of the other wedge gate or 91cbe valves closed light indicates the position that the Torque Switch bypass is removed on opening and is set at 20 to 05% for full stroke. The control method for these valves will be unique and will need to be addressed separately in Maintenance procedures f or Limitorque and f or MOVATS testing.
l 12- DenL90_Vettilsattoo_Easteet Attached. 1 .I, 1 i l 1 l l I l s l l I i
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INTRA COMP ANY MEMORANDUM July 1, 1986 M d h F h 7 h / e o sru : 9365
,o File:
g , 1.. Ster:
,, s E. J. Carrid ,
svenct
- /- -
Engineering Evaluation of W 601 and W 612.
Purpose:
This : e to provides the background, NFED evaluation and future course of actior, for repairs to N 601 and W 612.
Background:
The present design of W 601 and W 612 requires that these 18" Gate Valves be ; closed in 14 seconds. The resulting combination of a high speed limitorque ' actuator and torque switch setting to overcome the design differential pressure results in a high stress to the valve disc upon closure. This stress has resulted in cracking of the stellite seating surfaces on the disc. The high loads are due to the 15 to 20 milliseconds delay between torque switch actuation and the opening of the valve motor contactors and due to the momentum of the disc and limitorque mass at the high closing speed. O without major up grades to the motor control centers.The contactor time delay can not be improve The Valve Stroke time hence closing speed is set by safety analysis requirements and can not be easily modified. ; Finally, the torque switch setpoint (thrust) cannot be lowered without potentially ' af fecting the ability of the valve to close against the limiting design differential pressure. New Approach: FCR 86-0198 has been issued to modify the Closing Control Scheme. The new approach for controlling valve closure is to turn the motors of f at a predetermined position just before the disc contacts the valve body, and to allow the valve disk to " coast" into the seat. This will allow us to control the high momentum stress loads ar.d prevent cracking of the disc seating surfaces while still attaining sufficient clocure force to adequately seal the valve. The inital setpoint will be established by an FCR testing process conducted on one valve (W 601). i Data f rom this test will be used to establish the final design setpoints and to analytically confirm the ability to close against the design differential pressure. I The modification will then be implemented on both valves. The scope of this modification requires no hardware changes, only rewiring of the ; control scheme and adjustment to the geared limit switches. 1 I 1
Engineering Evaluation of FW 601 and F'a' 612 (Cont'd) () Potential Problems: This technique is new and only possible through the use of the MOVATS test equipment. It has been done at the Sequoya Plant in a similar application. Schedule Considerations: There appears to be no impact on the critical path schedule te accomplish this repair. A copy of the proposed schedule is attached which will be integrated into the overall restart schedule and a copy cf my memo to Steve Smith concerning precautions on FW 612 needed until the modification is complete. For the purposes of the Integrated SFAS Test,FW 601 is available to be stroked, however FW 612 should remain tagged out until the modification is implemented. This is acceptable to the SFAS Test leader. PNC:RCE:krk cc: P. Hildebrandt P. Carr N. Bonner J. Kasper S. Jain J. Wood J. Lingenfelter n B. Peters
'd .
D. Knaszak B. O' Conner D. Lightfoot S. Smith Attachment V
b 3AFETY EVALUATION F0E FCR 86-0198. SUPPLEMENT 0 Title FW 601/FW 612 Limitorque Control Modification. introcuetien FW 601 and FW 612 are the main feedwater stop valves to the steam generators. and have the following safety functions. Containment isolation for the main feed system. High Energy Line Break Isolation, high Steam Generator Level. Shut Off and Feedwater 3 System Line Break isolation. (Prevent Back Flow from Steam Generator.) Backeround The present design of FW 601 and FW 612 requires that these 18" Gate Valves be closed in 14 seconds. The resulting combination of a high speed Limitorque actuator and torque switch setting to ! )[\ overcome the design differential pressure results in a high
- stress to the valve disc upon closure. This stress has resulted in cracking of the stellite seating surfaces on the disc. The nigh loads are due to the 15 to 20 milliseconds delay between I
torque switch actuation and the opening of the valve motor contactors and due to the momentum of the disc and Limitorque mass at the high closing speed. The contactor time delay can not be improved without major upgrades to the motor control centers. The Valve Stroke time hence closfng speed is set by safety analysis requirements and can not be easily modifieo. Finally, the torque switch setpoint (thrust) can not be lowered without potentially arfecting the ac111ty or the valve to close against the limiting design ditterential pressure. Discussion To alleviate the high thrust condition due to inertia on valves FW 601 and FW 612. this FCR supplement provides for a temporary change to the valve control circuitry for testing purposes in ,
, accordance with the test outline. The basic change is to de-energize the motor of the valve operator l based on valve ,
position. rather than torque switch trip, which is the ,present l i method or control. l 1 i I
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O l TEST OUTLINE FOR FCR 86-0198 EuCEQ5e Using the MOVATS system set FW 601/FW 612 to a target thrust using the MOV limit switch to control valve movement. Provide the data obtained to NFED for evaluation of permanent design change. SECGial_EQuiEoeot
- 1. Motor operated valve analysis and test system (MOVATS)
- 2. Calibrated dial indicator and mounting equipment as required Befetences
- 1. Maintenance procedure MP 1410.32 testing of motor operated valves using MOVATS. (Latest Revision)
Limitatican_aod_Etecautions n V
- 1. An NFED Engineer must be present during this test.
i 2. This test must be accomplished on FW 601 which still contains a cracked disc. This will prevent the potential for cracking the new disc presently installed in FW 612.
- 3. Do not exceed 15 minutes total run time on the valve actuator motor during i hour. If 15 minutes total run time is reached in one hour, or the motor shows signs of overheating discontinue this test until the motor has returned to ambient temperature.
- 4. All precautions, limitations and prerequisites of MP 1410.32 (latest revision) apply during this test.
ECQcedute NQIES
- 1. Wiring changes to position the valve using the limit switches shall be completed prior to starting this procedure.
- 2. This outline may be modified by the NFED Engineer during the test if required by showing all changes on this outline and on the MWO work history sheet.
- 3. Install MOVATS equipment per MP 1410.32 prior to step #1.
O
r d -
- 1. Ett_UQ2_Glesute_to_A_ Intent _Ibtunt A. Starting with the valve approximately 90% closed adjust limits as required to achieve a target thrust of 140,000# ! 10% per MP 1410.32.
NQIE It will probably require several attempts with the valve being closed a greater percentage each time, to achieve the desired target thrust. B. When the desired target thrust is achieved check the limit switch trip point for repeatability as follows:
- 1. Fully open the valve and manually lightly back seat in the open position.
- 2. Electrically close the valve and store the MOVATS traces for TMD and switches.
- 3. Repeat steps 1 and 2 six times and compare switch trip points and total thrust record results.
- 2. OktAiO_MAlyR_ Dies _E9511190_dRAEutRORQtt j A. Electrically close the valve.
B. Mount a dial indicator in such a way as to measure stem movement in the open direction. C. Manually open the valve until the limit switch rotor f or motor control trips. Record dial indicator reading. D. Manually close the valve until the limit switch rotor for motor i control just trips. E. Zero the dial indicator at this point and continue closing the valve until seat contact is just encountered, and record the dial indicator reading. UQIE An additional dial indicator may be used to measure spring pack reflection to determine point of contact with the seat. F. Remove equipment, and perform f unction test of valve prior to returning to service.
- 3. Data _Collectico
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A. Maintenance Eng. provide all MOVATS traces obtained during this test to NFED for further evaluation. , 1 i _ _ _ _ _ _ _ , - - , , -,m-- -
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O-SAFETY EVALUATION FOR FCR 86-0198 SUPPLEMENT 1 Description of Proposed Activity This FCR will provide for changes in FW601 and FW612 motor . operated valve control circuitry to cause these valves to close on I limit switch control instead of torque switch control. ; The present design of FW601 and FW612 requires that these 18" Gate Valves be closed in 14 seconds. The resulting combination of a high speed Limitorque actuator and torque switch setting to overcome the design differential pressure results in a high stress to the valve disc upon closure. This stress has resulted in cracking of the stellite seating surfaces on the disc. The high loads are due to the 20 to 25 milliseconds delay between torque switch actuation and the opening of the valve motor contactors and due to the momentum of the disc and Limitorque mass at the high closing speed. The contactor time delay can not be improved without major upgrades to the motor control centers. The Valve Stroke time hence closing speed is set by safety analysis requirements at 16 seconds from the time of safety system actuation , with a maxium of 15 seconds of that time being allowed for valve closing and can not be easily modified. Finally, O ! the torque switch setpoint (thrust) can not be lowered without potentially affecting the ability of the valve to close against the limiting design differential pressure. To alleviate the high thrust condition due to inertia on valves FW601 and FWS12, supplement 0 of this FCR provided the means to modify the control circuitry of FW601 and FW612 to de-energize the valve operator in the closed direction based on valve position, rather than torque switch trip. Supplement 0 also served to gather data in the field to support the validity of this approach. The purpose of the data gathering was twofold:
- 1. To show that upon de-energization of the actor at limit switch trip, the valve would " coast" to a fully closed position under all expected operating conditions.
- 2. To verify the repeatability of the valve closure.
The subsequent evaluation of data gathered has shown the following:
- 1. Upon limit switch trip and motor de-energization, the valve disc needs to " coast" approximately .025 inches to be tightly seated.
However, based on field sensurements, the valve disc is already approximately .475 inches below its seat rings at the point of beginning " coast". If we use the worst case conservative assumption O that full flow in the line at the time of closure will eliminate all
" coast", it can be seen that this same flow will force the disc tightly against its seat stopping all flow. Therefore, the valve will provide the tight shutoff required under all conditions, m
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- 2. Once the desired " target thrust" was obtain.ed , six !
additional closures of the valve were performed measuring thrust with the "Movats" equipment. These subsequent closures show that all l
- thrusts were within 1.7% of the original setting, which is acceptable. l l
i Systems Affected The main feedwater system is the only system affected by this ) change. j Documents Affected MP 1410.32 - Testing of Motor Operated Valves using Movats. Safety Functions of Systems Affected FW601 and FW612 are the main feedwater stop valves to the steam i generators and have the following safety functions. Containment Isolation for the main feed system. High Energy Line Break Isolation. High Steam Generator Level Shut Off and Feedwater System Line Break Isolation. (Prevent Back Flow from Steam Generator) i Effects on Safety Based on evaluation of field data, it has been shown that this FCR's modification to the FW601 and FW612 control circuit in no way detracts from its ability to perform its safety function and enhances equipment reliability by preventing thrust values during normal operation from exceeding the fail value of the valve disc. Unreviewed Safety Question Evaluation "The proposed action would not increase the probability of an accident previously evaluated in the USAR because the operating parameters of the valve have not been changed, i.e., stroke time not effected".
"The proposed action would not increase the consequence of an '
accident previously evaluated in the USAR because the valve performance has not been changed".
"The proposed action would not increase the probability of a malfunction of equipment laportant to safety because this FCR increases the reliability of the components and will reduce the probability of valve disc failure".
"The proposed action would not increase the consequences of a i
malfunction of equipment important to safety because this FCR does not
- make any changes to valve operation, hence the malfunction of concern, failure of the valve to close remains the same".
l "The proposed action would not create a possibility for an accident of a different type than any evaluated previously in the USAR l N b Mb 9 b _ _ - . _ _ . o. _ _ _ _ _ _ - . _ - _ _ _ . _ - - - - _ _ _
because it does not change the functioning of the valves, and, therefore, cannot cause a different type of accident". l "The proposed action would not create a possibility for a malfunction of equipment of a different type than any evaluated previously in the USAR because the basic operation and functions of the valves are not changed".
"The proposed action would not reduce any margin of safety as defined in the basis for any technical specification because no technical specification is modified or changed, therefore, the margin l of safety is not changed".
Conclusion Based on the above review and evaluation, there is no unreviewed safety question involved. Prepared By: O C Date 9-Y-fd R. C. WTfstrom Checked By: _ Date -I-8
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O %y .- 1 - 1 EVALUATION 0F FIELD DATA FOR FW601 AND FW612 i A target thrust of 136, 112e was achieved setting the limit switch to i allow the valve to coast into its seat. Stroking the valve was performed six additional times to evaluate the repeatability of the setting. This results in a maximum thrust difference of 1.7% from the originally achieved value. Upon completion of setting target thrust, measurements were obtained using a dial indicator. These measurements have shown the'following: 1r Distance from limit switch trip until valve is "hard seated" is
.053 inches.
- 2) Amount of valve travel from limit switch trip until starter drop out occurs and motor de-energized is .025 sec.
3: Amount of " coast" required to hard seat the valve .028 inches. The valve "hard seats" (seat rings contacting wedge on both sides) .5 ( inches or travel after the disc initially is even with the seat rings. Under flow conditions. any point past this position will shut off flow oue to differential pressure causing the disc to seat on the downstream side. With a distance of only .028" (inches) until the valve contacts its hard seat it can be shown that the limit switch will not trip until after the valve has shut off flow. Limit switch trip versus thrust generated is shown graphically in l figures 1 and 2. A question was raised in the design review meeting concerning the amount of thrust required to cause seat failure on .these valves. 1 Information received from VELAN shows the value for seat failure in ) excess of SaO.OOOs (Ibs.) of stem thrust. ) i O' l e
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i TEST DUTLINE FOR FCR 86-0198 SUPPLEMENT 1
- 1. Purpose A. Set up valves FW601 and FW612 to close, using limit switch l control instead of torque switch control.
- 2. Special Equipment Needed A.
Novats 2100 System B. Dial Indicator 0" - 2"
- 3. References i
A. N/A
- 4. Limitations and Precautions A. Maximum total thrust not to exceed 140,000.1bs.
B. Target thrust for valve, 115,000 lbs. 1 15,000 lbs. (using limit switch).
) C. Valve must be of f seat prior to start of procedure.
2 D. A maintenance engineer must be present during this ! l procedure. I j E. Target thrust for torque switch setting, 91,000 lbs.,t 9,000 lbs. l 5. Procedure i A. Connect Movats unit to valve as required. B. Remount handwhee1. C. Close valve with handwheel until seat is just felt. D. Mount a dial indicator on valve so that stem movement may be measured. 4 J E. Raise stem 1/2" (one half inch) with handwheel. 1 F. Set rotor #2, (contacts 7 and B opening) to trip at this point with the valve traveling in the close direction. G. Remove dial indicator.
) H. Electrically open valve to approximately mid position.
I. Electrically close valve. gg2. 9/s/et , , amo
NOTE: If no spring pack deflection is observed during electrical closure, at the discretion of the maintenance engineer, the dial indicator may be remounted and the stem starting point lowered in .05" (inch) increments until initial deflection is observed. J. Open valve manual'ly past the point where rotor #2 trips. K. Manually close the valve until rotor #2 just trips. L. Close the valve 1/4 (one fourth) handwheel turn. M. Reset rotor #2 to just complete trip at this point with the valve traveling in the close direction. N. Ekectricallyopenvalvetoapproximatemidposition. O. Electrically close valve. P. Note: If thrust increase is greater than 20,000 lbs. per run, the maintenance engineer may elect to use a lower value than 1/4 (one fourth) handwheel turn each run. Q. Continue steps J through O until limit switch target thrust O,- value is achieved. i R. Upon successful completion of step Q, adjust torque switch to trip within target thrust range. S. If valve geometry has been changed, ii.e. new disc or stem, do the following:
- 1. Using handwheel, raise stem above rotor # 2 trip point, close valve until rotor # 2 just trips.
- 2. Mount dial indicator to measure stem movement in close direction. Allow for 1/2" movement.
- 3. Record reading.
- 4. Using handwheel, close valve until seat just felt.
- 5. Record reading.
- 6. Acceetance Criteria A. Limit switch target thrust achieved - 115,000 Lbs. t 15,000 Lbs.
B. Torque switch target thrust achieved - 91,000 Lbs. t 9,000 lbs. V 5 29 $ 5/ # n N C-
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Docket No. 50-346 License No. NPF-3 l Serial No. 1357 Attachment 9 l , I t ATTACHMENT 9 UNBALANCED TORQUE SWITCH 10CFR21 REPORT TO NRC l,
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O v oo EDISON Docket No. 50-346 JOE WouAMS. JR 5eur vsa Presders.Nurmar (419)249 23CD License No. NPF-3 I*'*18'85223 Serial No. 1-706 February 3, 1987 United States Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Centlement This letter confirms our conversation with Messrs. P. Byron and P. Wohld of your staff on January 29, 1987. Toledo Edison is reporting a problem that was found in the torque switches supplied with Limitorque operators installed at Davis-Besse Nuclear Power Station, Unit No. 1. his condition is being reported under the requirements of 10CFR21. The concern is that Limitorque did not supply adequate instructions to maintain the torque switches " balanced" so that the torque at torque switch trip is equal for both valve opening and valve closing. With the torque switch unbalanced, the torque switch can trip before the valve operator can produce sufficient torque, or thrust, to operate the valve against its design differential pressure. Specifically, on January 26, 1987, in the review of the data for Toledo Edison's answer to IE Bulletin 85-03, it was determined that prior to June 9,1985, (torque) thrust measured for the main steam to auxiliary feed pump turbine il containment isolation valves (MS106 and MS106A) was insufficient to close against the design differential pressure of 1100 psig. The low closing thrust for these two valves has been determined to be a result of the operators having an unbalanced torque switch. The settings on the torque switches were correct. Imbalance, prior to developing a method of measuring thrust, was not considered as a significant parameter. The use of equipment to measure the thrust now allows this imbalance to be measured and evaluated. Based on IE Bulletin 85-03 testing, calculations indicate that M3106 would have fully closed against a maximum 468 paid pressure and M5106A would have fully closed against a maximum 901 paid pressure. These pressures are below the design differe.'tial pressure of 1100 peig. A mechanical device has been developed to mes.ure and adjust torque switch balance without C having to use thrust measuring test equipment, and has been demonstrated by testing these type of switches. THE TOLEDO EDEON COMPANY EDWON PLAZA 300 uaruanat AvgNUE TOLENA OMO 48808
n I Decket No. 50-346 License No. NPF-3 () Serial No. 1-706 Page 2 Limitorque was informed by phone by Toledo Edison of this problem on January 27, 1987. Prior to implenentation of the Motor Operated Valve Reliability Improve-ment Testing Program, Davis-Besse had several unexplained torque switch tripping problems which were solved by replacing the torque switch. These could likely have been the result of unbalanced torque switches. Toledo Edison's Motor Operated Valve Reliability Improvement Program confirmed proper operation of all torque switches prior to the restart following the June 9, 1985, shutdown. Vcry truly yours. [ /
- PC DJS:p1f cc: DB-1 NRC Resident Inspector J. G. Keppler, Regional Administrator (2 copies)
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Docket No. 50-346 License No. NPF-3 Serial No. 1357 Attachment 10 i 4 1 ATTACHMENT 10
! ACTION PLAN 12 4
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i 1 O FINDINGS, CORRECTIVE ACTIONS AND GENERIC IMPLICATIONS REPORT i i TITLE: Toledo Edison - Auxiliary Feedwater System Valves AF 599 and AF 608 t j REPORT BY: James W. Long (TED) PLAN NO.: 12 l Robert C. Elfstrom (Babcock & Wilcox) PAGE 1, j l i i I I i i 4 CHAIRMAN ( REV DATE REASON FOR REVISION BY TASK FORCE R. C. Elfstrom 0 8/11/85 Initial Issue J. W. Lona B . R . Beye r - , i R. C. Elfstros j 1 8/19/85 Added Corrective Actions J. W. Long L. A. Grime k Heading and R. C. Elfstron l 2 8/29/85 Title Change J. W. Lona L. A. Grime r i Corrections to R. C. Elfstrom 3 2/28/86 Backaround Information J. W. Lona L. A. Grime 4 9/9/86 Final Report J. W. Lona M _ l Corrections to Torque i Switch Setpoint Root 7AO l 5 3/18/87 Cause P. N. Carr M a 4 i
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dh 2 O TABLE OF CONTENTS i Page [ I. Issue / Concern 3 i ! j II. Basic Principles of Motor Actuator 3 III. Summary of Troubleshooting and Investigation 5 i l A. Field Actions Performed 5 j B. Analysis Performed 8 C. Significance of Findings 9 j IV. Results/ Conclusion of Findings 9 i A. Direct Causes 9 I B. Root Causes 10 C. Disapproved Hypotheses 10 f f V. Technical Justification of Finding 11 ) VI. Specific Corrective Action 12 i
- A. Required Corrective Action 12 l l !
j B. Additional Planned Action 14
! VII. Generic Implication: 15 a
l A. Significance 15 ! B. Planned Actions 17 l $ i 1 1 r 1 t 8 I i i 10 i 1 ,
3 g b I. Issue / Concern During the June 9, 1985 reactor trip, Auxiliary Feedwater (AFW) to Steam Generator (SG) motor operated isolation valves, AF 599 and AF 608, closed on a demand from Steam Feedwater Rupture Control System (SFRCS). However, when the SFRCS was reset, both valves failed to re-open on demand. The cause of the failure of the motor operated valves to re-open against the differential pressure was an 5 improperly set torque switch bypass limit switch and torque switch. This finding was based upon actual tests following the plant tran-sient. An action plan (Plan #12) was formulated to confirm these findings and also to determine any other possible cause which may have contributed to the failure of the valves to re-open. This report provides the summary of troubleshooting and investigations. II. Basic Principle of Operation of Motor Actuator L Seten Assemoy \
- C as
" " Worm o S a,MammEonngs-Gear MCIC' Train h Solineo Shatt O
Worm Gear V " I* t.wgs to Rotate Stem Nut Slem Nut The motor rotates the worm through a gear train. The worm gear rotates the stem nut, which raises or lowers the threaded valve stem. When the worm gear can no longer turn (valve closed, open, or ob-structed) the worm then moves axially along its splined shaft com-pressing a Belleville spring pack. This axial movement operates the torque switch and stops the motor. The torque setting is related l directly to the amount of spring pack compression. When the motor is reversed, a loss of motion must be taken up until the worm gear lugs engage the stem nut. This motion permits the motor to reach full speed while unloaded and then apply a hammer blow to the valve stem
- to unseat the valve. The limit assembly is directly driven by the (g gear train and can be adjusted to operate at any point of valve travel.
The torque switch assembly basically performs the following functions: i) It de-energizes the motor in rising ster. valves when the valve seats in the closing direction. ii) It protects against mechanical overloads anywhere between full open and full closed position of the valve, except when bypassed in the opening direction, iii) In the opening direction the torque switch is wired in series with the geared limit switch and as such acts as backup to prevent damage to the valve's back seat. t A simplified electrical schematic of the torque switch contacts is shown below: OPEN Torgue Switch Power Torque Switch Motor Supply Bypass Contacts i / 4 CLOSE Torque Switch l During the opening sequence of wedge type gate or globe valves, such as AF 599 and AF 608, a high torque is required to unseat the valve disc. Typically, this high torque is required for 50 to 2000 milli-seconds, after which torque requirements to continue opening the valve drop by 60% to 80%. Contacts on the geared limit switch bypass the "open" torque switch during this "high torque" period, to prevent torque switch actuation from stopping valve motion. After the valve is unseated, this bypass opens, returning the torque switch to the circuit. This sequence allows the actuator to deliver the high torque necessary to unseat the valve while providing conservative mechanical overload protection during the majority of the valve travel. III. Summary of Troubleshooting and Investigation A. Field Actions Performed 1
! 1. Maintenance Work Orders 1-85-1941-01 & 02 and 1-185-1945-01
& 02 were written calling for inspection and testing of
! valves AF 599 and AF 608, respectively.
l
4 J O 2. A visual inspection was.nade of the valves and operators. There were no significant deficiencies noted. / {
- 3. The torque switch settings were verified to be as specified
] per FCR No. 84-039 and Torrey Pines Technology study of all Davis-Besse Motor Operated Valves (MOV).
, 4. Testing of AF 599 and AF 608 was performed utilizing ! Davis-Besse procedures to examine and analyze valve opera-l bility. Additionally, these valves were also tested using
. MOVATs (Motor Operated Valve Analysis and Test System).
- This equipment is a totally portable system designed for j field use. This system is capable of acquiring, storing, and analyzing the following critical valve, operator, j control circuit and motor parameters during actual valve j operation
l Actual valve stem thrust Time of actuation of all control switches 1 Dynamic motor current i Actual operator output torque The following tests were performed: 4 i) Both valves were tested without differential pressure across the valve disc using MOVATS. The results indicated that the "open" torque switch bypass con-tacts opened prior to actual unseating of the valve. This allowed the torque switch to be re-enabled prematurely, but since the torque switch setting was i above the torque required to unseat the valves, they operated satisfactorily. I' ii) Both valves were again tested with a differential pressure of 1050 psi across the valve disc without utilizing MOVATS. Each valve was operated three times. Valve AF 599 failed to open in all three j operations. In every operation it was observed that the "open" torque switch bypass contacts opened prior j to actual unseating of the valve and caused premature
! torque switch trip. Valve AF 608 failed to open one I
time out of three tests using 1050 psi differential ; pressure across the valve disc. Again it was observed j that the "open" torques switch bypass contacts opened 2 and placed the torque switch in the circuit prior to l the unseating of the valve. , iii) The valves were retested with differential pressure } across the valve using MOVATS. i j 4
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I i () A. AF 599 was tested three times with a differential l pressure of 1050 psig across the valvd. The , valve actuator was de-energized by the torque switch prior to the valve unseating in all three tests. B. AF 608 was tested two times with a differential pressure of 1050 psig across the valve. The valve opened successfully in both tests. Howev-er, the torque switch trip setting was very close to its trip point. Two additional tests were performed with a differential pressure of'1095 and 1100 psig, respectively, across the valve. In both tests, the valve actuator was de-energized by the torque switch prior to the valve unseating. ! C. As in previous tests, the open limit switch bypass contacts opened and placed the torque switch back in the circuit prior to the valve unseating.
- 5. The valves were operated manually to determine the setting of the bypass contacts. The contacts on both valves opened O, prior to the stem moving 5% of the full travel as specified in procedure MP 1410.32 which reflected the information contained in the Torrey Pines study.
- 6. The spring packs were inspected. The locknut on AF 599 was found to be installed backward and without a setscrew.
This discrepancy did not affect operation of the valve. When AF 608 was tested, the preload on the spring pack was found to be slightly lower than expected. This would have caused the valve to torque out at a slightly lower value. B. Analysis Performed
- 1. Calculations have been performed to verify that the hotor horse power and the actuator sizes are correct.
- 2. Stem stresses have been checked to verify that they do not !
exceed ASME design values. / l
- 3. The present torque switch settings of both valves were !
I checked and were found to be in accordance with settings required per FCR No. 84-039 dated March 4, 1984 and are reproduced below: open dial torque switch = 1.5 close dial torque switch = 1.0 O
The FCR was issued to change the torque switch setting in the closed direction because AF 599 torqued out while attempting to open during an earlier plant shutdown. The new setting was based on design information from a Torrey Pines Technology study of. Davis-Besse MOVs.
- A subsequent review of the March 1984 Installation of FCR No. 84-039 revealed that the Torrey Pines input data was i incorrect. Investigation revealed that a thread lead of
.25 was mistakably. input instead of 3"/3. Reanalysis indicates that the "open" torque switch should have been set at 2.0, using the procedures defined in the Torrey Pines study.
In addition, the closed torque switch setting, based on flow testing in TP 851.49 and TP 851.50, was probably'only 4 sufficient to close the valves against a differential pressure of 700 psi to 800 psi. i The Torrey Pines supplied formulas used to calculate the torque switch setpoints did not take into accc"at multiple thread stems. When determining thread lead, ase of this formula required inputs of stem diameter ani thread lead 5 to calculate the conversion between torque and thrust. Omission of the number of threads will always result in a lower torque switch setting than required for valves with multiple threaded stems.
- 4. Calculations have been performed based on the plant condi-tions during the event of June 9, 1985, and indicate the actual differential pressure across the valve for AF 599 and AF 608 was higher than 1050 psig. '
C. Significance of Findings
- 1. A correctly adjusted limit switch bypass contact allows sufficient torque to be applied to the valve to unseat it.
With this contact misadjusted, the torque switch was put in the circuit before the valve fully unseated. This prema-turely tripped the motor on June 9, 1985. With the exist-ing torque switch setting, the valve operator was not allowed to deliver required thrust. +
- 2. Post maintenance and surveillance testing were performed with 0 psig differential pressure across the valve which required much lower unseating torque than required with the differential pressure existing on June 9, 1985. Thir testing was inadequate to reveal the fact that the limit switch bypass was set improperly and put the torque switch in the circuit prior to valve unseating.
- 3. This mode of failure of Limitorque operators applies only N to wedge-seating gate or globe valves.
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- 4. Reduction of the close T. S. setting by FCR 84-039 would not have allowed th6 valves to fully close during a design 4 basis steam rupture.
IV. Results/ Conclusions of Findings A. Direct Cause The limit switch bypass contacts opened prior to the valves unseating. This placed the torque switch back in the circuit
- during the period when the torque generated by the actuator was higher than the torque switch setpoint, causing the actuator to de-energize prior to unseating the valves.
j Proper setting of the torque switch trip point and correct ; adjustment of spring pack pre-load can increase the probability of the valves opening with a misadjusted limit switch bypass, i however, the torque switch settings were also set to lower than 4 required values due to the error in the formula used to calcu-late them. 5 B. Root Causes i There are several factors that contributed to the failure of valves AF 599 and AF 608 to re-open. O 1. Ambiguous Torrey Pines Information I The procedure as supplied by Torrey Pines Technology for
- setting the position of the bypass contacts gave ambiguous l- instructions. The procedure called for setting the contacts based on a percentage of valve stem movement. The intent, as indicated by Torrey Pines representatives, of I the procedure was to set the contacts based on a percentage of valve disc movement.
- 2. Incorrect Dimensional Information Supplied Torrey Pines l4 i
Torrey Pines Technology conducted a study of Davis-Besse MOVs. They used design information from vendor valve i drawings to calculate torque switch settings. An error by , Torrey Pines in the values used and the use of an incom-plete formula resulted in an incorrect calculation of , torque switch settings. 5
- 3. Inadequate Test Procedures i Incorrect adjustment of bypass limit switch was not discov-i ered during post maintenance or surveillance testing due to '
l the lack of any differential pressure across the valve l during this testing. Had a differential pressure been applied the valve would not have functioned properly. 5 I
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rs C. Disproved Hypotheses
- 1. Improper Torque Switch Setting - The torque switches were set correctly in that they were set per the directions of 1
FCR No. 84-039 and the Torrey Pines study. However, these settings were not correct for the actual stem dimensions of 4 valves AF 599 and AF 608.
- 2. Wrong or Improperly Adjusted Spring Pack - Both spring packs were verified to have the correct size and number of washers. The spring pack shoulder nut installed backwards on AF 599 did not contribute to the failure of AF 599. The spring pack on AF 608 was slightly out of adjustment, but was not a direct cause of the failure of the valve to open.
- 3. Failure of Motor Brake to Release When Energized or Engage When Deenergized - Brake operation was observed on both valves and both brakes were found to be operating correctly.
- 4. Improper Torque Switch Installation - Both torque switches were verified to be installed correctly.
- 5. Valve Operator Capability to Handle High Differential es Pressure - As stated earlier, both valves were tested close to open with a differential pressure of 1050 psi across the 4 valve seat. Even though they failed to open against this differential pressure, the reason for the failure was found to be incorrect setting of the limit switch bypass contact.
With the proper switch settings, the valve operators are capable of handling 1050 psi differential pressure. V. Technical Justification of Findings The troubleshooting and investigation evaluated the valve and opera-tor in detail for causes that vould have prevented the valves from opening. Reports from the Equipment Operators that were dispatched to manually open the valves, indicated that the valves torqued out. The Action Plan was developed to investigate any component in the operator that could have caused the observed anomaly. The failure of the valves was reproduced by simulating the transient i conditions. MOVATS testing and the inspection of the valve operators l substantiate that the cause of failure has been correctly identified. i l 1 The causes for the anomaly observed on June 9,1985 associated with AF 599 and AF 608 have been positively established and the equipment 4 has been removed from the freeze list. O l
VI. Specific Corrective Action A. Required Corrective Action The following actions have been identified to correct existing deficiencies and prevent future problems with the Limitorque operators on AF-599 and AF-608.
- 1. Maintenance Procedures Issue Maintenance Procedures (MP) to provide proper in-structions for corrective maintenance, for setting limit and torque switches on type SMB Limitorque valve operators, and to test Limitorque operators using the Motor Operated i Valve Analysis and Testing System (MOVATS).
This action was completed on August 7, 1985 upon issue of 4 MP 1410.32, Rev. 3 and MP 1411.05, Rev. O.
- 2. Limit Switch Bypass Contacts Setpoint t
Adjust the limit switch bypass setting (closed rotor) of AF 599 and AF 608 to a value of 20% of full stroke in the open direction as measured from the point of valve disc s movement. This will ensure the torque switch is not placed j in the open circuit prior to the valve fully unseating. Adjustments to be performed per the current revision of l MP 1410.32 and MP 1411.05. This action was completed 4 under MWO's 1-85-1941-03 and 1-85-1945-04. l
- 3. Torque Switch Setpoint Adjust the torque switch setpoint in the open direction to the maximum value that will still preclude valve damage, per FCR 85-134. This setting will act as a back-up to the bypass setting and will give increased confidence of proper valve operation. Adjustments to be performed per the curreat revision of MP 1410.32 and MP 1411.05.
This action was completed under HWO's 1-85-1941-03 and 4 1-85-1945-04. !
- 4. Verification of Valve Data Used for Stress Calculations !
Verify that valve data and mearurements used for stress and unseating torque calculations are correct based on field ~ measurements of valve dimensions used in calculations. This action was completed July 7, 1985 and is on file as 4 MWO 1-85-1941-01. O l
4 5. Valve Operator Testing Verify the adequacy of limit switch and torque switch i adjustments during valve operation. This will be accomplished by testing AF 599 and AF 608 with a differen-tial pressure of 1050 psig across the valve, using the l current revision of MP 1410.32 testing of Limitorque motor operated valves using MOVATS. This action was completed under MWO's 1-85-1941-03 and 4 1-85-1945-04.
- 6. Differential Pressure Review system design and operating parameters to ensure that a design differential pressure of 1050 psig is ade-quate to ensure proper operation of AF 599 and AF 608 upon activation by a Steam Feedwater Rupture Control System (SFRCS) signal.
The differential pressure (D/P) limits for AF 599 and AF 608 4 have been reevaluated per NEP-092 resulting in an increase 1 of the design D/P from 1050 psid to 1425 psid. The close torque switch is being reset to a new target thrust based on the new D/P under MWO's 1-86-2990-00 and 1-86-2991-00. In addition AF 599 is being stroke tested in both the open and close directions at the new higher D/P using the Motor Driven Feed Pump while monitoring the valve with M0 VATS. The target thrust based on the Velan formula for the valves proved to be insufficient to fully close the valves. TP 851.49 and TP 851.50 were run to establish the proper 4 torque switch setpoints. Additional flow testing of other gate valves indicates that the increased thrust to close AF 599 and AF 608 is an isolated problem. Further investigations are planned as to the root cause of this condition. These valves require significantly more thrust than the vendor recommendations indicate. Discussion of this is contained in the referenced test procedures summary. 4 At 1050 psid it required over 12,000 lbs of thrust to close the valves. A torque switch setting of I will produce less than 6500 lbs of thrust. Thus the Torrey Pine torque switch setting to close, established by FCR 84-039, was also significantly in error. (Ref. Para III.B.3.5 and l5 Para III.C.4) The torque switch settings to assure the valves will close against a 1425 psi differential, with , sufficient margine, are 2.25 for AF 599 and 2.5 for AF 608. O
t 1 4 i . i, B. Additional Planned Action
- 1. Preventive Maintenance Procedures (PM)
I Prepare and issue procedures to provide instructions for j preventive maintenance on Limitorque operated valves. i Maintenance Procedure MP 1411.06 (Preventive Maintenance 4 for type SMB and SMC Limitorque Valve Operators) was issued September 12, 1985. i 2. Review of Surveillance and Post-Maintenance Testing Procedures Review surveillance and Post-Maintenance Test Procedures to determine if this testing or portions thereof can be J performed at expected operational differential pressures.
; Operations Engineering performed a detailed review of each 4 motor operated valve by system. Changes were made to surveillance tests where possible. The results of this i review are filed under LCTS #1265.
,i
- 3. Training Institute a formal training program for personnel perform-ing maintenance on Limitorque valve operators and personnel operating and analyzing data from MOVATS test equipment.
A formal training program has been established for those '4 personnel performing maintenance on motor operated valves. l This training involves both classroom instruction and
" hands on" laboratory training. In addition, detailed i training is given in the installation and operation of the MOVATS test equipment. This training is required every 2 years. The training records are maintained by the Maintenance Training Department.
I
- 4. Maintenance Procedures ,
Issue corrective maintenance procedures for type SMC l Limitorque operators. i a Maintenance Procedure MP 1411.07 (Maintenance and Repair 4 4 of Limitorque Valve Operator Type SMC-04) was issued January 2, 1986. l VII. Generic Implications l A. Significance i ! There are 232 Limitorque operated valves at Davis-Besse. Not l all of these are wedge-seating. There are generic implications 1
- , , - - , ,-- .,, - ....,m-----_ . _ . , - - - . . _ - , _ _ , . - _ _ , _ , . . _ - _ , , . _ _ . _ _ . _ . _ _ - - _ _ . _ . , - , . , _ _ _ - - . -
3 i 13-O v
. specifically for wedge-seating valves and generic implications l that apply to all Limitorque operated valves. The significance /
and planned actions are separated into these categories.
- 1. Limitorque Operators on Wedge-Seating Valves
- a. Based on procedures existing at the time, all of these valves can be assumed to need readjustment of the limit switch bypass contacts to ensure proper operation.
- b. All safety-related valves need to have the torque switch setpoint increased to maximum for the open cycle.
- 2. All Limitorque Operators at Davis-Besse
- a. There may be additional cases of vendor drawings not reflecting as-built dimension which can produce incorrect values for settings of torque switches.
- b. Adequate procedures for corrective and preventive maintenance apply to all Limitorque operators at Davis-Besse.
- c. There may be other cases where post maintenance and surveillance testing does not adequately ensure proper valve operation under operating conditions.
- d. There may be other cases where a review of design differential pressure versus' operating pressure may be required.
l e. Adequate training for personnel engaged in maintenance and testing of Limitorque operators is required for
; all Limitorque operators at Davis-Besse.
- 3. There may be other types of valve actuators using the same basic principles as Limitorque operators whose torque-sensing protection could cause similar problems.
- 4. MOVATS Testing
.: a. M0 VATS testing will show Torque Switch and Limit Switch set points and operator condition, and most
, valve problems.
- b. MOVATS under zero differential pressure will not show 4 minor valve problems which could become significant under high differential pressure.
- c. Static differential pressure testing, flow tenting
- and/or a good internal inspection program is needed to detect valve internal degradation, d
O' . B. Planned Actions
- 1. Limitorque Operators on Wedge-Seating Valves
- a. Adjust the limit switch bypass contacts to a value of 20% of full open stroke as measured from the point of valve disc movement,
- b. For all safety-related valves, set the torque switch to the maximum in the open direction.
All safety related wedge-seating valves have the 4 limit switch bypass contact set to open at 20% of disk cycle time and open torque switch set at maximum allowable. Attachment 1 is a listing of the MWO's by valve # that completed those actions.
- c. For all wedge seating valves important to safety, the closing torque switch was set to a minimum of 161% of the calculated thrust to close where possible. Where '4 ,
this was not possible do to initial or operator / valve limits, testing or analysis of the valve was perform-ed to be sure it will close.
- d. Continue evaluation of the root cause for the higher .
than anticipates closing forces for AF599 and AF608 O per RFA 86-0357-00.
- 2. All Limitorque Operated Valves at Davis-Besse
- a. Issue maintenance procedures to provide instructions for corrective maintenance and testing of all Limitorque operators at Davis-Besse.
Maintenance Procedures; MP 1411.04 (Maintenance and 4 Repair of Limitorque Valve Operators Type SMB-000 and SMB-00), MP 1411.05 (Maintenance and Repair of Limitorque Valve Operators Types SMB-0 through SMB-4), MP 1411.07 (Maintenance and Repair of Limitorque Valve Operator ' Type SMC-04), MP 1411.06 (Preventive Maintenance for Type SMB and SMC Limitorque Valve Operators, and MP 1410.32 (Testing of Motor Operated Valve using MOVATS) have been issued to control the maintenance and testing of all Limitorque Valve Operators. l
- b. Verify that calculations used in adjusting Limitorque j operator torque switches are correct based on field i measurements of valve dimensions used in calculations. i Calculations used in adjusting torque switches have 4 been verified per NEP-091. If necessary, all drawings for safety related valves will b corrected prior to e
i ) l
O restart. Drawings for non-safety related valves will be corrected, if needed, when these valves are tested. Results of these checks are stored in NFED.
- c. Review the preventive maintenance program for Limitorque operated valves.
All preventive maintenance for Limitorque operated 4 valves was reviewed. Preventive Maintenance activity approval (PMAA) forms were submitted for all operators to revise the existing PM's to include all of the requirements of MP 1411.06.
- d. Review Post-Maintenance testing and surveillance testing procedures to ensure they reflect the opera-tional requirements of the operator where possible.
Operations Engineering performed a detailed review of 4 ; each motor operated valve by system. Changes wert ; made to surveillance tests where possible. The results of this review are filed under LCTS #1265.
- e. Institute a formal training program for personnel performing maintenance and testing on Limitorque operated valves.
O A formal training program has been established for 4 those personnel performing maintenance and testing on 3 limitorque operated valves. This training includes classroom instruction and " hands on" laboratory training. This training is required every 2 years. The training program is controlled and administered by ] q the Maintenance Training Department.
- 3. Investigate other types of valve actuators at Davis-Besse to ascertain whether similar problems could exist.
This review was conducted and it has been determined that 4 no other similar problems exist.
- 4. Attachment 1 is a listing by valve of each Maintenance Work Order (MWO) that set the open torque switch bypass contact to 20% and the open torque switch to maximum allowable. In 4 addition, where other settings and modifications were
{ required, the MWO is listed. l l O J se c/2 l l l
NSR VALVES LIST Pcq3 1 Gorted by NSR VALVE NUMBER. Notes: Twh uW $% J N I6 AS *F l0 A A l tdo . +
.' Date 9 k%
.....'..........L......................................................
I : : : II : : : :
- : : : II : :
i VALVE : : : : !! VALVE : : : : j NUMBER : : : : II NUMBER : : : :
.........:...:...:...:.....=...u.Il...........:... ... ...:...........
l AF0360 /- &s - Jiv3.co e/.fr. Avv/ -001 : CV5010A : a /- Ff- t v?4 c'e> AF0388 : : : /-gf. tyv/ - oy t ! CV5010B : t /- pg. t e ?o. - / f-l AF0599 /. 3, - 1. 5 9 t>- c '<' 31. W . / 4v/ - o V I ! CV5010C t : 1. w - 2 9 % - o r AF0608 i -yu _ Ju r - . . ) t /. fr5 - 19 vs - o 3 ! I CV5010D : : : / - tr e . /*-re - / e i AF0969 t /.h.- fw/- o / ! ! CV5010E : : n/-kS-Fe-M -/7 j _ AF0870 / t 36 s po ): p a s j.g. tyy/- op t ! CV5011A : : : /- w -74M // l AF0871 / . yg rgf3 - tw s / 3 v . zws - c-31 ! CV5011B : : t /- Ar- /G M - o> j AF083 s . > (. - 79pi oc : f 9;. zw/- or! I CV5011C : : : / &f.26 75 -Et
- CC1028 : : : f.gr . 23,7. o n ! ! CV5011D : : : : /- #f -2474 - c>5 CC1308 : : : : f. pc. tin . c, i ! ! CV5011E : : : /-M-te,n er -
CC1407A : : t / . pg . t/., iS- 7 9 !! CV5017 : : t/-#f-2674-23 1 CC1407B : : : 3 , . rg- r e g . 3 o t ! CV5018 : a n / -
- f . ft I V l CC1409 : : : j.Sg-7ys,- og I I CV5024 : a n /- Fi -IFi? - i 7
! GG1410 /- ye - r r 3 9. op s f . u.cs., i . c3 8 I CV5025 : : n / - vr . zrs ? - if-j CC1411A : : t/ .M. zew. 3 s t l CV5037 : a n / -Jr I.16M - f f
- CC14118 : : s j . yr. rp ,c, . f c,1 1 CV5038 : : : n / -Iri- lG14- f e j L.610,6 / R : : t /- W. ?pi? . civi l CV5056 n n n/-#f-76W-77
- CC1567B / - re../2q) - ec : 1. g r. r e sc- z e t t CV5057 : n a n / - as- 7& % - 2 P CC2645 : 1,$t- 2t.1<> . o rt ! CV5065 : a n /-M- 24 m - M i CC2649 : : tj.g .rcere,-oe!! CV5070 : : : n / -h f- 0/- M . ov CC4100 , - gr. 3 fo,1. u on /. yr- tv/ 7. v./ t ! CV5071 : : t / .5rf.tv10 . cc l
l CC42OO : : : i f.s.5- ty ,9 . vr ! I CV5072 : : : / -he-/h -r - or,- j CC43OO : : : a f.vc .;) p9 . o&l t CV5073 : : t / - W . rt W . ci? i CC4400 : : : 31.vt.*Pr?.vo!I CV5074 : : : si. 9 .r . r o 7 5 . o s- ! CC5095 : : : a j. p r. 2re ? - 0 71 1 CV5075 : : : /.w - 2975 - oG i CC5096 : : : t/.9c Ip,9-e3tI CV5076 : : : / Pr-7&x . / o CC5097 ., a : :/.yi. ty p9 - o ,l c t CV5077 : : : / .frr z /os - / r CC5098 l- S o . ) ) 10 . O r> /.h c. ticon r o 1 1 CY5078 : : : n / -sc - tur -/L j CFOOO1A : : : : /. ',5 2 r , 7 - i t i I CV5079 : : n / - &'r 2 & ?ct - /3 j CFOOO1B : : .: t /. ys- zr e 7. is t I CV5090 : : t / -hs .16 79 33 l } CFOOO2A / . e t . ca g y - n > v i- W- # 715 - o i i I DHOOO1A : : / Pf- EVv/ -IP !
) CFOOO2B : : tr.g.;7m .ofII DHOOO18 : : : /-F(- 7 W/ - 2 S l CFOOO5A : : : f.3c.; sn . c f I I DHOOO7A : : : / fff - tW/ - J k
- _CFOOO5B
- : : : i- vy.: 7,3 - c. , I t DHOOO78 : : : / -#f" f vF/ - 3") '
i CS1530 : : : : /.u.Juvi. 33 I t DHOOO9A : : : : 1 -S .;- lW/- t e l CS1531 : : : 3,-xs. z w, . s y i I DHOOO9B : : : /. wf. 7w/ - t *7 CVO624B : : : s i . e e - t r i 7 - s's I t DHOO11 : a a /.Er.Ers?-2/ l CVO645B /-frG.,0 9 t>9. c+ si.V. "y e 7 'of f DHOO12 t n n n / ->1( Er r 7- 2 L CV2OOOB : : : : / - b-tri?- /3 I I DHOO63 : a n f -u - l'/V/ - t 7- ' CV2OO18 : : : : / .W. tre ? -sv I ! DHOO64 / afc- 0-7e P . CO : 1 - )1 f - ? W I - l')
- : : i . fr. If,9 - f f I ! DHOO30 : : : : / - 3f- FW/ - ic, l gw CV2OO2B CV2OO;B / .si. .: .wes . ,w s j- ,g. t y f ,- , e i I DHOO31 / s%- s tat t a : / - a ./w/ - re-
! 1
~
,- NSR VALVES LIST Pcgo 2 Sor-ted by NSR VALVE NUMBER. Notes:
i Dates
=====%========='m=====================n================================
- : : Il : : :
VALVE : : !! VALVE : : : : NUMBER : : : : il NUMBER : : a mammamanagemagsmagmengammansammenllmmmmmmmmmmagsmagsmagsmagummmmmmmmme
~DH1517 : : a /.85. tyyt. t A I I MUOO12A / /cinf. nr.> : /-gf . 7S/ /. sy DH1518 : : : f. y e. /vvi . 3 c ! I MUOO12B : : : / .hf- 2 Fr ?-VA DHO733 : : s f . n. . va, . t i l MUOO40 : : : / -h -ZFr ? -29 DH2774 : : : / .yf- t yvs - 4 / ! ! MUOO59A : : : : / . .sf. r 715. oy DH27;5 : : : : , .g. 7 -j y f . o o i I MUOO59B _ / -Ew -jVl& * (T~) ) / - m - r 111 - ttf DH2736 : : : t / .xi. 2 V/ 7- t 3 : ! MUOO59C : t a r / -Fi- 7111 00 DR2012A : : : : /. n- zy i 7 . ta/ ! ! MU0059fi e + '
! > - h '- ? ' '8 8 ~ # 7 DR2012B : : : t/.n.; zyo , trli MUOO63 /~ k 5- */22.5-00 ,/ Es . 29/ 9
- M FWO601 fcc %. - o n t s. /- gf- zu.jp- s p i i RCOOO2 t t t s / -kf
- 2 9 / ~1
- 3 f FWO612 pt <:, n .0,1r- t / - &f - 7 vv/ - / c ! ! RCOO10 : a r /. k f -IP/? - 3V FWO779 : : : : / .M. ?vu - M ! ! RCOO11 : : : /-Pf- FW/ - / A FWO780 : : /- # 5- ? */ / . </01 i RCO2OO : I / -t r- /WI - / 3 FW5867 : : : s t- si- Oc. f - vol l RCO239A : : / -Ff Ivv/ - iV HA5261A : : t /. gg. ;.p g. 3y i I RCO239B : : t / .fr S -zw / - / s' HA5262A : : a f g. ;p .m 33-1 i RCO240A / pp are;(tr+ 3 f.rr-rw/-/v HA5305A : s i-h - ?0 7') - k l i RCO2408 : : : /. fr f- F W/ - 3f.
^ HA5305B : : : /.3r- 76. -ig , [? I I SW1366 : : : I/-Rf 26M.V2 HA5314A : t/.gf.rpf7 ft,Il SW1367 : : t / - P S - 7& 14. V3 HA5439 : : t/- y g - It- M . e l l SW1368 : t/. W - It 7er . W HA5440 : : s i . v.c r e. .p;- 34 t l
. SW1379 : : t/.A f 7 W /. D-HA5441 : : t / . v ,. . f ,,. .f c . pp! I SW1380 : : : /-Xf Evy/. W HA5442 : : : : j . w. . / , . y, . 9, i I SW1381 1 : : / -pf- tw/ - y-)
HPOOO2A / . s,o - / 9 ,w . 0 0 t f.9f. g f.3,II SW1382 : : : : /-h . f t,75 - < p HPOOO2B : : :j.g .299f.4: II SW1383 : : : - f >f- 2v M r: HPOOO C l -f& t't*V. W ; .y g . ?qq j .pqli SW1395 : 8 :/.>;.76 gr,.yg-HPOOO2D f - N - i r9(. . .e a s. s., ? v vi - t 3-! ! SW1399 : : : : /-&f- 7916 - W. HPOO31 : : : /. > <. m 7. : ? ! I SW2927 / -b- /71.;1 - cu : /-gr- rws - VV HPOO32 : : : /.\.-ZYe7- M-li S W ':.9 2 8 : : 8 8 /- hi - 7W/ - Vf" MSO106 : : : / . 5,r- F i r s o s t i SW2929 : : 1.F r -20 7, </ / _MSO106A _ : t/ 3 5. t q q f . v .1 1 I SW2930 t t : t/-5 $ ?G 79 .yr-MSO107 / - YG- 2e06 0/ / . y f . ?w s - 4 f ! I SW2931 : : t/-Kr.?c.>9-Y6 MSO107A : : : :/ -h 1vv/ .v31 ! SW2932 : t- 1 -#f- 24 74 -ro MSO603 : : / -gr- zyvt- v4 I I SW5067 : : : : /-if. t&s 1-3P MSO611 /.w -/44 00 : i . fr f - 7svt _f # 1 I SW5068 : : : /-&.i".2p/1 37 MUOOO1A : : : : 1.f r - 0 9 :1. so l i SW5421 / - fr5- 3s' 0 -os : /.frf- 2 7 /1- 3 r MUOOO1B : : : t /-PS. 3/? - 3 f i t SW5422 / - !if - 3F4 J'-C u s f -te- r yi 9 - M MUOOO2A /- kw -is,or - oo :/.;< f J vi,- 31 I I SW5423 / a f- JP.;s1- 07_ t 1-ye, u,7 - vo MUOOO2B : : t / M. 4,1. H i t SW5424 : : t/.>r.2n 7- 41 MUOOO4 : : : / . y r, 2 9, 7 . f01 ! SW5425 : : : / - p e ? r, 9 . v_r. _MUOO10A : : : / -rf, ty s , , < 31 I _ MUOO10B 't : t/.bi.cri? 11!I MUOO11 : : t/.ey Ws?, W II 2 f}}