JPN-94-057, Requests 6 Month Extension to Original Schedule Commitment for Completion of GL 89-10 Program Re safety-related MOV Testing & Surveillance Program

Requests 6 Month Extension to Original Schedule Commitment for Completion of GL 89-10 Program Re safety-related MOV Testing & Surveillance Program

ML20149G891
Person / Time
Site:	FitzPatrick
Issue date:	11/04/1994
From:	William Cahill POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-10, JPN-94-057, JPN-94-57, NUDOCS 9411080162
Download: ML20149G891 (17)

Text

- . m - .. _ _ _ - .. 2 _

e-123 Main street WNte Plains. New York 10601

.p 914 681 6200

1. > NewYorkPower 4v Authority

- November 4,1994 JPN-94-057 U, S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555

SUBJECT:

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 Safety-Related Motor-Operated Valve Testing and Surveillance Program (Generic Letter 89-10)

BegueELfoLSchedulehtension

REFERENCES:

1. NRC Generic Letter 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," dated June 28,1989.

2. NRC Generic Letter 8910, Supplement 6, "Information on Schedule and Grouping, and Staff Responses to Additional Public Questions," dated March 8,1994.

Dear Sir:

This letter requests a six month extension to the original schedule commitment for the completion of the FitzPatrick Generic Letter 89-10 program (Reference 1). The original j schedule commitment is the third refueling outage after Generic Letter 89-10 was issued. The

- extension is needed to complete the documentation and evaluation of the testing and valve  !

modifications being performed during the third refueling outage, which is scheduled to begin l November 1994. ,

, I The Authority has completed the review of design basis system parameters and initial l static testing for the 91 valves currently in the program. Dynamic testing will be completed during the startup period following the upcoming refueling outage. Valves which cannot be verified by dynamic testing will be setup based on current best available information, within the original commitment schedule.

9411080162 9411'A ~5 PDR _ADOCK 0500 ,

P \ .

i Attachment i provides supporting information specified in Generic Letter 89-10, Supplement 6 (Reference 2) to justify this schedule extension request. Attachment il provides additionalinformation regarding analysis methods, as requested by the NRC staff during a telephone call with the Authority on October 13,1994.

ll you have any questions, please contact Mr. J. A. Gray, Jr.

Very truly yours, William J. Cahill, Jr.

l; Executive Vice President and Chief Nuclear Officer l l

)

STATE OF NEW YORK l COUNTY OF WESTCHESTER Subscribed and sworn to before me KATHLEEN D GALLAGHER this Y - 4 Notary Pu c. New York day of November 1994.

Qualified in Westchester count Commission Expires Nov.16,1 b -

P Notary Public / /

cc: Regional Administrator, Region i U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Office of the Resident inspector U.S. Nuclear Regulatory Commission P.O. Box 136 Lycoming, New York 13093 Mr. John E. Menning Project Manager )

Project Directorate I-1 Division of Reactor Projects - t/II '

U.S. Nuclear Regulatory Commission Mail Stop 14 B2 Washington, DC 20555

. l ATTACHMENT l TO JPN-94-057 MOV PROGRAM COMPLETION STATUS AND CAPABILITY OF VALVES NOT VERIFIED BY DYNAMIC TESTING Page 1 of 4 This attachment provides supporting information for a six month extension of the Generic  ;

Letter 89-10 MOV program (Reference 1) at the James A. FitzPatrick Nuclear Power Plant.

The original schedule commitment is the third refueling outage after Generic Letter 89-10 was

~ issued. The extension is needed to complete the documentation and evaluation of the testing -

and valve modifications being performed during the third refueling outage, which is scheduled >

to begin November 1994.

The following information is provided based on guidance from the NRC for schedule extension requests (Reference 2):  :

A. PROGRAM COMPLETION STATUS The Authority has completed the review of design basis system parameters and initial static testing for the 91 valves currently in the program. The Authrity has completed dynamic testing of 30 valves. Dynamic tests are scheduled for an a litional 16 valves during the ,

upcoming refueling outage (RFO) and the startup period following the outage. Initial reviews of DP test results, with linear extrapolation to design basis differential pressure, will be performed before the valves are returned to service.

The Authority has determined that 46 of the 91 valves currently in the program can not be verified by dynamic testing. Evaluations of the design basis capability of these non-testable '

valves are complete and 38 valves are currently setup based on best available information.

The remaining 8 valves are scheduled for modification or adjustment during the RFO. These ,

valves will be setup based on best available information within the original commitment  !

schedule. Additional information regarding the definitions for non-testable valves and the analysis methods used to evaluate these valves is provided in Section B.  :

B. DATA AND CAPABILITY EVALUATION FOR VALVES NOT DYNAMICAL'L Y TESTED Rafioitloos_.ancLClassincatina A valve in the MOV program is not dynamically tested if it is 'Not Practicable to Test' (NPT) or

'Not Meaningful to Test' (NMT). A valve is not practicable to test if that test:

• will violate a Technical Specification,

• has the potential to damage station equipment, a requires modification of existing plant equipment, or a requires systems lineups which would result in a safety concem or an unresolved safety issue.

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1 ATTACHMENT I TO JPN-94-057 MOV PROGRAM COMPLETION STATUS AND CAPABILITY OF VALVES NOT VERIFIED BY DYNAMIC TESTING Page 2 of 4 NMT means that the valve could be tested, but that test would not provide significant new information. Dynamic testing is not meaningfulif any of the following conditions apply:

i e The differential pressure (DP) thrust component of the total thrust requirement is less than or equal to 10% of the total thrust requirement, for gate and globe valves.  ;

• The aerodynamic torque is less than or equal to 10% of the total torque requirement, for butterfly valves.

• The MOV is a globe valve with an open safety function, which is pressure or flow assisted in the open direction, and which has the torque switch bypassed in the DP loading region of the open stroke.

• The margin between MOV thrust capability (or torque for butterfly valves) at the ]

current field settings and the required thrust (or torque) determined from engineering analyses is at least 100%. This margin is above that already i incorporated for torque switch repeatability, rate of loading, and diagnostic test l equipment inaccuracy. '

Safety _Eunctions oLValves NRLDynamically Tested Table One provides safety function data for the 46 valves in the FitzPatrick program which are NPT or NMT. This table identifies the valve number, system function, and the safety function ,

in the open, close, or both directions. The table also provides a measure of the relative risk i significance for each of the 46 valves. The FitzPatrick Individual Plant Examination (IPE) model was used to develop this information.

Risk significance is a quantitative measure of the effect of a single MOV or group of MOVs on the core damage frequency (CDF) in the IPE Level I analysis and on the radiological release frequency (RRF) in the Level ll analysis. The evaluation performed to determine the risk ,

significance of the FitzPatrick MOV program valves was based on the guidelines of NUMARC l 93-05 (Reference 3). The MOV's were placed into one of three risk significance ranking  ;

categories based on the following criteria: l l

High Equivalent to a 50% or greater increase in the total baseline core damage frequency.

Medium Equivalent to a 10% to 50% increase in the total baseline core damage frequency Low Equivalent to less than a 10% increase in the total baseline core damage frequency.

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ATTACHMENT 1 TO JPN-94-057 MOV PROGRAM COMPLETION STATUS AND CAPABILITY OF VALVES NOT VERIFIED BY DYNAMIC TESTING Page 3 of 4 EYaluation Methodology for ValvasERLRynamically Tested Evaluations were performed for each of the valves not dynamically tested to establish thrust target widows for setting up the valves and to identify the need for modifications. The evaluations were based on best available industry and plant specific data, including use of conservative assumptions where specific data was not available.

The evaluation methodology consists of three parts.

• Calculate the minimum stem thrust requirement for design basis flow and r differential pressure conditions.

• Calculate the maximum stern thrust and torque limitations based on motor capability, spring pack limitations, and valve and actuator weak link analysis.

• Apply margin to the calculated thrust and torque values to account for torque switch repeatability (TSR) and diagnostic test equipment inaccuracy. Margin for rate of loading (ROL) is also applied to the minimum stem thrust requirement.

The analysis method used to calculate thrust and torque is described in Attachment II. Values for margin are determined as follows.

The margin for TSR is based on guidance from the valve actuator manufacturer, Umitorque (Reference 4), unless lower values can be justified using site empirical data.

VOTES equipment is used at FitzPatrick and margin for inaccuracy is applied based on vendor recommendations. The Authority previously provided information (Reference 5) to the l NRC on this subject in response to Supplement 5 (Reference 6). ,

ROL is defined as the difference between an MOV's control switch trip (CST) thrust output ,

under static and dynamic conditions. When this difference is greater than the square root of the sum of the squares of diagnostic equipment inaccuracy and TSR, the difference is  !

considered to be ROL.

Margin for the combined effects of TSR, ROL, and diagnostic equipment inaccuracy is applied to the minimum required thrust. A bias ROL value, which is added directly to the minimum required thrust, is determined by calculating the ROL mean for the site DP test population. A random ROL value is determined by calculating the ROL standard deviar on for the site DP test population. The random ROL value is added to the TSR and diagt.astic equipment ,

inaccuracy values using the square root of the sum of the squares method. The resulting sum is applied to the minimum required thrust.

Margin for the combined effects of diagnostic equipment inaccuracy and TSR is applied to the  !

maximum allowable thrust and torque. The margin value is obtained by combining diagnostic equipment inaccuracy and TSR using the square root of the sum of the squares method.

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ATTACHMENT I TO JPN-94-057 MOV PROGRAM COMPLETlON STATUS AND CAPABILITY OF VALVES NOT VERIFIED BY DYNAMIC TESTING Page 4 of 4 EyalualiGDRCSults The results of the evaluations for the valves not dynamically tested are reported in Table Two.

This table identifies the valve number, valve type and size, and design basis differential pressure and flow rate. Thrust margin and available valve factor are reported in the table to provide quantitative measures of valve capability. The evaluation results include the effects of modifications or adjustments previously performed to improve design basis capability and available margin.

Eight of these valves are scheduled for modification or adjustment during the RFO. These valves will be setup to meet their minimum thrust requirement with margin for torque switch repeatability, diagnostic equipment inaccuracy, and rate of loading, by the original commitrnent date for program completion.

C. REFERENCES

1. NRC Generic Letter 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," dated June 28,1989.

2. NRC Generic Letter 89-10, Supplement 6, "Information on Schedule and Grouping, and Staff Responses to Additional Public Questions," dated March 8,1994.

3. NUMARC 93-05, " Guidelines for Optimizing Safety Benefits in Assuring the ,

Performance of Motor-Operated Valves," Nuclear Management and Resources Council, Inc., dated December,1993.

4. Limitorque Maintenance Update 92-2, regarding various technical aspects of l Limitorque motor operators.

5. NYPA letter (JPN-93-072/ IPN-93-115), R. E. Beedle to NRC, " Response to Generic Letter 89-10, Supplement 5," dated September 30,1993.  ;

1

6. NRC Generic Letter 89-10, Supplement 5, " Inaccuracy of Motor-Operated Valve l Diagnostic Equipment," dated June 28,1993.

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. TABLE ONE MOV SAFETY FUNCTION DATA FOR VALVES NOT VERIFIED BY DYNAMIC TESTING (Page 1 Of 2)

SAFETY FUNCTION **

MOV ID RISK VALVE DESCRIPTION OPEN CLOSE CAT.

02MOV-53A Low RECIRC PUMP A DISCHARGE N/A LPCI initiation 02MOV-538 Low RECIRC PUMP B DISCHARGE N/A LPCI initiation 10MOV-17 High RHR SHUTDOWN COOLING OUTBD N/A Containment Isolation 10MOV 18 High RHR SHUTDOWN COOLING INBD N/A Containment Isolation 10MOV-26A High RHR A CONTAINMT SPRAY OUTBD Initiate Drywell Sprays Containment Isolation 10MOV-26B High RHR B CONTAINMT SPRAY OUTBD Initiate Drywell Sprays Cor tainment isolation -

10MOV-31 A High RHR A CONTAINMENT SPRAY INBD Initiate Drywell Sprays Containment Isolation 10MOV-31 B High RHR B CONTAINMENT SPRAY INBD Initiate Drywell Sprays Containment Isolation l 12MOV-15 Low RWCU SUPPLY INBD N/A Containment Isolation 12MOV 18 Low RWCU SUPPLY OUTBD N/A Containment Isolation t I

12MOV-69 Low RWCU RETURN N/A Containment isolation ,

13MOV-15 Low RCIC STEAM SUPPLY INBD N/A Containment Isolation '

13MOV-18 Low RCIC PUMP SUCTION FROM CST N/A Suction transfer to Torus 13MOV 21 Med RCIC PUMP DISCHARGE INBD RCIC initiation Containment Isolation 13MOV-39 Med RCIC PUMP SUCT FM TORUS OUTBD Align RCIC Suction to Containment Isolation Torus 13MOV-41 Med RCIC PUMP SUCT FM TORUS INBD Align RCIC Suction to Containment Isolation Torus 13MOV 132 Med RCIC TURBINE LUBE OIL CLG WTR RCIC Turbine Lube Oil N/A Cooling 14MOV-7A Low CSP PUMP A TORUS SUCTION N/A Containment Isolation 14MOV-7B Low CSP PUMP B TORUS SUCTION N/A Containment Isolation 14MOV-11 A Low CSP A DISCHARGE INJECTION OTBD N/A Containment Isolation 14MOV-11B Low CSP B DISCHARGE INJECTION OTBD N/A Containment Isolation 15MOV-175A Low RBCLC/ESW CROSSTIE RETURN ESW to Supply RBCLC Terminate ESW Supply 15MOV 175B Low RBCLC/ESW CROSSTIE RETURN ESW to Supply RBCLC Terminate ESW Supply 20MOV-94 Low DW EQUlP DRAIN SUMP DISCHARGE N/A Containment Isolation 23MOV 15 Low HPCI STEAM SUPPLY INBD N/A Containment Isolation 23MOV-17 Low HPCI PUMP SUCTION FROM CST N/A HPCI Suction transfer to Torus 1

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TABLE ONE MOV SAFETY FUNCTION DATA FOR VALVES NOT VERIFIED BY DYNAMIC TESTING (Page 2 of 2) i SAFETY FUNCTION **

MOV ID RISK VALVE DESCRIPTION OPEN CLOSE CAT.

23MOV 19 High HPCI PUMP DISCHARGE INBD HPCl initiation Containment Isolation 23MOV 57 High HPCI PMP SUCT FROM TORUS OTBD Align Suction to Torus Containment Isolation 23MOV-58 High HPCI PMP SUCT FROM TORUS INBD Align Suction to Torus Containment Isolation 27MOV 113 Low CAD DRYWELL EXHAUST BYP OTBD Direct Contain gases to Containment Isolation SGT 23MOV 117 Low CAD TORUS EXHAUST BYPASS INBD Direct Contain gases to Containment isolation SGT 27MOV-120 Low CAD CONTAIN EXHAUST TO SGT Direct Contain gases to N/A SGT 27MOV 121 Low CAD CONTAIN EXHAUST TO SGT Direct Contain gases to N/A SGT 27MOV 122 Low CAD DRYWELL EXHAUST BYP INBD Direct Contain gases to Containment isolation SGT 27MOV-123 Low CAD TORUS EXHAUST BYP OUTBD Direct Contain gases to Containment Isolation SGT 29MOV 74 Low MST INSIDE STEAM DRAIN N/A Containment isolation 29MOV-200A Low MSLCS A MASTER ISOLATION Collect MSIV Leakage N/A 29MOV-2008 Low MSLCS B MASTER ISOLATION Collect MSIV Leakage N/A 29MOV-201 A Low MSLCS/SGT A ISOLATION Collect MSIV Leakage High Pressure to SGT 29MOV 201B Low MSLCS/SGT B ISOLATION Collect MSIV Leakage High Pressure to SGT 29MOV-202A Low MSLCS/SGT EVU ISOLATION N/A High Pressure to SGT 29MOV 202B Low MSLCS/SGT B/U ISOLATION N/A High Pressure to SGT 29MOV 203A Low MSLCS A MSIV LEAKOFF Collect MSIV Packing N/A Leakage 29MOV-203B Low MSLCS B MSIV LEAKOFF Collect MSIV Packing N/A Leakage 25,MOV-204A Low MSLCS A BYPASS DRAIN N/A Collect MSIV Leakage 29MOV 204B Low MSLCS B BYPASS DRAIN N/A Collec. MSIV Leakage

• • N/A indicates that the valve dOes not need to Stroke to that position (Open or Closed) to perform a Safety function.

TABLE TWO -

DESIGN BASIS CAPABILITY FOR  ;

VALVES NOT VERIFIED BY DYNAMIC TESTING  !

(Page 1 of 4)

I MOV VALVE VALVE FLOW MAX DP AVAILABLE THRUST l lD TYPE SIZE RATE psid VALVE FACTOR MARGIN 02MOV-53A Parallel 28 see note B 200 0.71 32 %

[

Dbl Disc t

02MOV-53B Parallel 28 see note B 200 0.64 19%  ;

Dbl Disc  !

i 10MOV-17 Parallel 20 15400 gpm 97.8 0.77 28 % i Dbl Disc i a -

10MOV-18 Parallel 20 15400 gpm 100 see note D see note D j Dbl Disc  ;

10MOV-26A Parallel 10 7200 gpm 242 see note D see note D Dbl Disc (217) (0.96) (82%)

10MOV-26B Parallel 10 7200 gpm 242 see note D see note D  :

Dbl Disc (217f (0.92) (75%) j i

10MOV-31 A Globe 10 7200 gpm 239 2.44 103 %

(216) (2.47) (189%)

10MOV-31B Globe 10 7200 gpm 240 2.04 72 % l (216) (2.56) (198%)

12MOV-15 Parallel 6 1320 1103 see note D see note D Dbl Disc lbm/sec l 12MOV-18 Parallel 6 1320 1096 see note D see note D '

Dbl Disc lbm/sec i

12MOV-69 Parallel 4 600 1149 0.72 27 %

Dbl Disc lbm/sec 1 13MOV-15 Parallel 3 see note B 1090 see note D see note D Dbl Disc 1 13MOV-18 Solid wedge 6 416 gpm 21 3.4 71 %

13MOV-21 Flexible 4 see note B 1228 5.86 112 %

wedge (1228) (0.55) (10%)

(REFER TO NOTES ON PAGE 4) l

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. i TABLE TWO DESIGN BASIS CAPABILITY FOR ,

VALVES NOT VERIFIED BY DYNAMIC TESTING (Page 2 of 4)

MOV VALVE VALVE FLOW MAX DP AVAILABLE THRUST '

ID TYPE SIZE RATE psid VALVE FACTOR MARGIN 13MOV--39 Solid wedge 6 see note B 34 2.64 95 %

(14) (16.04) (409%)

13MOV-41 Solid wedge 6 see note B 33 2.35 78 %

(13) (14.36) (348%)

13MOV-132 Globe 2 16 gpm (1160) (8.22) (2332 %)

14MOV-7A Solid wedge 16 see note B 33 2.22 175 %

14MOV-7B Solid wedge 16 see note B 33 1.84 135%

14MOV-11 A Flexible 10 6900 gpm 315 2.19 217 % i wedge )

14MOV-11B Flexible 10 6900 gpm 315 1.26 93 %

wedge 15MOV-175A Solid Wedge 6 2170 gpm 121 0.73 11 %

(108) (1.81) (138%)  ;

15MOV-175B Solid Wedge 6 2170 gpm 120 0.86 25%

(107) (1.96) (154%)

1 20MOV-94 Parallel 3 100 gpm 79 4.93 146 %  !

Dbl Disc l

23MOV-15 Parallel 10 see noto B 1090 see note D see note D Dbl Disc 23MOV-17 Solid wedge 16 4250 gpm 15 3.41 190 %

23MOV-19 Flexible 14 see note B 1181 1.31 110 %

wedge (1126) (0.66) (33%)

23MOV-57 Solid wedge 16 4250 gpm 37 1.25 77 %

(11) (3.88) (195%)

g it!MOV-58 Solid wedge 16 4250 gpm 37 0.91 34 %

(11) (2.69) (126%)

27MOV 113 Butterfly 3 see note B 44 see note C see note C (44) 27MOV-117 Butterfly 3 see note B 44 see note C see note C (44) {

l (REFER TO NOTES ON PAGE 4) l i

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TABLE TWO l DESIGN BASIS CAPABILITY FOR j VALVES NOT VERIFIED BY DYNAMIC TESTING  ;

(Page 3 of 4)  !

.l, MOV VALVE VALVE FLOW MAX DP AVAILABLE THRUST l lD TYPE SIZE RATE psid VALVE FACTOR MARGIN 27MOV-120 Butterfly 12 see note B 0 see note C see note C 27MOV-121 Butterfly 6 see note B 2.2 see note C see note C l 27MOV-122 y-Globe 3 see note B 44 25.7 400 %  :

(44) (78.22) (2224 %) j 27MOV-123 y-Globe 3 see note B 44 36.65 597 %

l (44) (72.49) (2063 %)  !

29MOV-74 Parallel 3 see note B 1105 see note D see noto D l Dbl Disc 29MOV-200A y-Globe 1 see note B (1090) (18.66) (2952 %)

29MOV-2008 y-Globe 1 see note B (1090) (18.66) (2952 %) {

29MOV-201 A y-Globe 1 see note B 1 3402 244 % l (16) (919) (1172 %) l 29MOV-2018 y Globe 1 see note B 1 3933 285% ,

(16) (917) (1170 %) l 29MOV-202A y-Globe 1 see note B 16 220 251 %

i 29MOV-2028 y-Globe 1 see note B 16 213 242 %

i 4

29MOV-203A y Globe 1 see note B (1090) (13.53) (21476 %)

c 1

29MOV-2038 y-Globe 1 see note B (1090) (13.45) (21367 %) l 29MOV-204A y-Globe 1 see note B 16 179 199 %

} 29MOV-204B y-Globe 1 see note B 16 242 278 %

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, (REFER TO NOTES ON PAGE 4) e i

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TABLE TWO DESIGN BASIS CAPABILITY FOR -

VALVES NOT VERIFIED BY DYNAMIC TESTING

' (Page 4 of 4) r NOTES ,

A. ' Values in parentheses (xxx) are for the~ valve opening cc.2ditions. Otherwise, values are for valve closing. Data is provided for the valve position which corresponds to a safety function  ;

as shown in Table One. Data is provided for valve opening and closing if the valve has safety .

functions in both positions. .

B. For cases where no flowrate is specified, the valve design basis DP condition does not include flow, or the original design basis review concluded that flowrate has no significant effect on the calculated MOV thrust requirement. ,

f C. Valve factors, minimum thrust requirements, thrust margins, stem coefficients of friction, etc, j are not applicable to butterfly valves. These valves will be setup, by the original commitment date for the FitzPatrick MOV program, using best available information including guidance .

provided in Information Notice 94-69, " Potential Inadequacies in the Prediction of Torque  !

Requirements for and Torque Output of Motor-Operated Butterfly Valves."

D. These eight valves are scheduled for modification or adjustment during the 1994 refueling outage, to increase thrust margin. These valves will be setup to meet their minimum thrust requirement with margin for torque switch repeatability, diagnostic equipment inaccuracy, rate of loading, and stem lubrication degradation by the original commitment date for program completion.

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ATTACHMENT 11 TO JPN-94-057 TORQUE AND THRUST CALCULATION METHOD FOR GATE AND GLOBE MOTOR OPERATED VALVES (Page 1 of 5)

1. MWIMUM REQUJHED_TBRUST FOR GATE VALVES l Minimum required thrust (MNRT) to operate a motor operated gate valve against a differential pressure is: l MNRT = PL + PE + DPE where PL = packing load - Ibs .

PE = stem ejection force - Ibs DPE = differential pressure effect - Ibs PL is obtained from test data or industry standards. 4 PE is determined as follows:

PE = SA x LP where i SA = Stem cross sectional area at packing - in LP = Upstream line pressure - psig ]

PE is negative for opening stroke and positive for closing stroke.

DPE is determined as follows:

DPE = VF x AS x DP where AS = disc area based on mean seat contact diameter - in

. DP = differential pressure across valve seat - psi VF = valve factor - dimensionless (refer to next section for additional l discussion of valve factor) l 1

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ATTACHMENT ll TO JPN-94-057 TORQUE AND THRUST CALCULATION METHOD FOR GATE AND GLOBE MOTOR OPERATED VALVES (Page 2 of 5)

II. MINIMUM BEQUlBEDJ11 RUST FOR GLOBE _ VALVES Minimum required thrust (MNRT) to operate a motor operated globe valve against differential pressure is determined as follows:

STROKE FLOW MNRT DIRECTION DIRECTION CLOSE OVER SEAT PL + PE - DPE CLOSE UNDER SEAT PL + PE + DPE OPEN OVER SEAT PL - PE + DPE OPEN UNDER SEAT PL - PE - DPE PE is determined as follows:

STROKE FLOW PE DIRECTION DIRECTION CLOSE OVER SEAT SA X LP CLOSE UNDER SEAT (LP - DP) X SA OPEN OVER SEAT SA X LP OPEN UNDER SEAT (LP - DP) X SA DPE is determined as follows:

DPE = VF x AS x DP where VF and DP are as defined in the previous section. 'AS' in this case is the valve seat or guide area, as appropriate. Valve factors for valves that are Not Practicable to Test (NPT) or Not Meaningful to Test (NMT), are established using grouping techniques. Each of the valves in the program have been assigned to one of 16 defined groups, based on valve type and manufacturer. There are 8 groups of globe valves,7 groups of gate valves, and all butterfly valves are in one group.

The empirical valve factor data for testable valves in the group is used for the non-testable valves in the same group. Statistical analysis is used to establish the appropriate valve f actor for the group.

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l ATTACHMENT ll TO JPN-94-XXX TORQUE AND THRUST CALCULATION METHOD FOR GATE AND GLOBE MOTOR OPERATED VALVES (Page 3 of 5) 111. STEM FACTOR The stem factor (SF) is a conversion factor used to convert actuator output torque to stem thrust:

SF= # #'" M U* W Stem Thrust Calculation of SF for Limitorque motor operators is as follows:

SF =

d x [(0.96815 x tan a) + p]

24 x [0.96815 - (p x tan a)]

where d = Pitch diameter p = Stem to stem nut coefficient of friction tan a= LEAD /( rr x d)

LEAD = (no. thread starts)/(no. threads per inch)

Calculation of SF For ball screw drives is as follows:

BSSF =

WD 24 x x x 0.9 1

.l ATTACHMENT ll TO JPN-94-057 TORQUE AND THRUST CALCULATION METHOD FOR <

GATE AND GLOBE MOTOR OPERATED VALVES (Page 4 of 5).

IV. MOIORIOBQUE_DERATE DUEIQAMBIENT AND MOTOR TEMPERATURES The equation to derate AC motors due to ambient or motor ternperature is:

LOS x

R,= MSTQ - MSTQ x (27900 (1.8 x RISE x TIME x 2 + (TEMP - 104)))

I where MSTO = motor rated starting torque - ft-Ibs LOSS =  % torque loss /155 C RISE = motor temperature rate of rise - C/sec TIME = closing stroke time - sec TEMP = maximum ambient temperature - F, 4 DC motors are derated as follows:

NOMINAL DC MOTOR Max. Available Starting Torque (Ft-Lbs) '

STARTING TOROUE RATING at Qualified Temperature (340 F)

(Ft-Lbs) 125 Volt Rating 250 Volt Rating l 40 39 36 60 54 51 ,

80 79 68 100 70 76 I

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ATTACHMENT ll TO JPN-94-057 TORQUE AND THRUST CALCULATION METHOD FOR GATE AND GLOBE MOTOR OPERATED VALVES -l (Page 5 of 5) .

I V. CALCULATION QEMOTOR TORQUE CAPABILITY A. Actuator output motor torque capacity at rated voltage (MC100ro) is' found as follows:

MC100ro = R , X UR X E X AF where R, m = determined above UR = unit ratio.

E = pullout efficiency. If valve is closing, running efficiency may be used for sealed-in close operation. Running efficiency is not  ;

l used for DC powered MOVs or for throttling valves where valve  ;

may be started under load.  !

AF = Application Factor  ;

B. Actuator output motor torque capacity at reduced voltage (MCRVra) is derived  ;

from MC10070 as follows:

MCRVra = MC1001 o X RVF where RVF = reduced voltage factor. RVF = (V/V,)2 for AC motors and V/V, for DC motors. RVF = 1 if V/V,2 0.9. i V, = reduced voltage at motor terminals -volts i

V, = rated voltage at motor terminals - volts

]

i C. Actuator output torque at stall (MCSra) conditions is obtained from end of motor i curve or calculated as follows: 1 MCSto = MSTO X 1.1 X UR X SE where MSTO = motor starting torque at 100% voltage 1.1 = stall factor UR = unit ratio 1

SE = stall etficiency I

.. . . .