ML17264A610

Rev 0 to Design Analysis Operability Evaluation for 857 A/B/C Ginna Station.

ML17264A610
Person / Time
Site:	Ginna
Issue date:	09/23/1996
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17264A608	List: ML17264A607 ML17264A610 ML17264A611 ML17264A612 ML17264A613
References
DA-ME-96-096, DA-ME-96-096-R00, DA-ME-96-96, DA-ME-96-96-R, NUDOCS 9609270297
Download: ML17264A610 (17)

Text

ATTACMMENT 1 Design Analysis Operability Evaluation for 857 A/B/C Ginna Station Rochester Gas and Electric Corporation 89 East Avenue Rochester, New York 14649 DA-ME-96-096 Revision 0 September 20, 1996 Prepared by: 9p~ 9j,

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Design Engi eer

~

Date Reviewed by:

Independent or Lead Engineer Date TECHNICAL INPUT FORM EIN 857A 857B 857C KEYWORDS MOV 0 erabilit CROSS REF None PSSL 03 PROPRIETARY YES NO OTH R X

5111 COMMENT None SUPERSEDES None Page 1 960'F270297 960924 PDR ADQCK 05000244 VDa'

REVISI N TATU HEET Revision Affected Number Sections Descri tion of Revision 0 all" initial document Design Analysis Revision 0 DA-ME-96-096 Page ii

OBJECTIVE To evaluate the operability of RHR system valves 857 A/B/C. Valve Bonnet pressure locking forces will be considered in this operability evaluation.

2.0 CONCLUSION

S 2~1 The total Required Thrust to open the 857 valves was determined to be 8759 lbs. This considers valve bonnet pressure locking conditions.

2.2 The minimum Available Thrust based upon In-situ Motor/Actuator capacity testing is 9456 lbs.

2.3 Valves 857 A/B/C are considered operable since the available thrust exceeds the required thrust.

2,4 The Total Required Thrust of 8759 lbs. does not exceed the weaklink limit thrust of 9027 lbs.

2.4 Conservatisms associated with this analysis are discussed in Section 8.5. These conservatisms would add additional margin, between the available thrust and the required thrust to open the subject valves.

' 1 Therefore this analysis is considered bounding.

DESIGN INPUTS Design Criteria, EWR 5111, Revision 1.

3.2 RG&E/MOVATS Static Diagnostic Test Package, MOV 857A, (M-64.1.2), dated 4/2/92.

3.3 RG&E/MOVATS Static Diagnostic Test Package, (M-64.1.2),

MOV-857A, dated 4/26/96.

3.4 RG&E/MOVATS Static Diagnostic Test Package, (M-64. 1.2),

MOV-857B, dated 4/30/96.

3.5 RG&E/MOVATS Static Diagnostic Test Package, (M-64.1.2),

MOV-857C, dated 4/29/96.

3.6 RG&E/MOVATS Diagnostic Test Package PT-50.19, (DP Test), 857A, Dynamic test dated 3/22/93, Static Test dated 4/2/92.

3' RG&E/MOVATS Diagnostic Test Package PT-50.19, (DP Test), 857B, Dynamic Test dated 4/4/92, Static Test dated 4/4/92.

Design Analysis Revision 0 Page 3 DA-ME-96-096 Date 9 19 96

RG&E/MOVATS Diagnostic Test Package PT-50.19 (DP Test),

857C, Dynamic Test dated 3/21/93, Static Test dated 4/3/92.

3.9 RG&E MOV Thrust Calculation, 857A, dated 3/8/96.

3.10 RG&E MOV Thrust Calculation, 857B, dated 3/8/96.

3.11 RG&E MOV Thrust Calculation, 857C, dated 3/8/96.

3. 12 RG&E I/O J.E. Pacher to B. Flynn, "MOVs 857A, B, and C Voltages", dated 9/17/96.

3. 13 RG&E/MOVATS Diagnostic Test Package, PT-50.2, (DP Test), 860C, Dynamic Test dated 4/24/90, Static Test Date 3/19/93.

3. 14 Anchor/Darling letter, C. J. Bower to S. Greer, P.O.

AP0-96190-1, Rev. 0, dated 9/19/96.

4.0 REFERENCES

4.1 Altran Calculation No. 94108-C-1, Rev. 0, dated 11/1/94.

ASSUMPTIONS None other than described in analysis.

6.0 COMPUTER CODES None 7.0 ANALYSIS 7~1 The total required thrust (T~) to lift 857 A/B/C off the seat during its safety-related condition will be calculated utilizing the methodology of Reference 4.1.

I 7.1.1 The total required thrust will include bonnet pressure locking forces.

7. 1.2 This calculation will reflect the latest available information regarding the 857 A/B/C valves.

7. 1.3 The calculated total required thrust will be compared to the test-determined available thrust (T) for the purposes of an operability assessment.

Design Analysis Revision 0 Page 4 DA-ME-96-096 Date 9 19 96

Total Required Thrust (T):

Stem Differential Pressure Load (F,~):

Stem Area (A~) = nD 4

D; Stem Diameter= 1.375" (Design Inputs 3.9, 3.10,

3. 11) 4 F~=PqA, where P~ = Bonnet Pressure (614.7 psi)

F,~ = (614.7)(1.48) = 913 lbs.

7.2.2 Stem Disc Wei ht Force Fg:

F= 50 lbs.

Note: This is conservative since the weight of the disc/stem assembly is assumed to be 50 lbs, per Ref. 4.1; Actual Field weight measurement of spare disc/stem assembly was found to be 26 lbs.

7.2.3

~ ~ Sealin Load F From Design Inputs 3.3, 3.4, and 3.5 the measured sealing loads (indicated as "unseating thrust open direction") for the 857 A/B/C valves are as follows:

Valve Measured F 857A 586 lbs.

857B 769.8 lbs.

857C 769 lbs.

.'. Bounding F~ is 770 lbs.

7.2.4 Packing Friction Load (Fpp):

From Design Inputs 3.3, 3.4, 3.5, 3.6, 3.7, and 3.8 the Measured Packing Friction loads (indicated as "Running Thrust open direction") for the 857 A/B/C valves are as follows:

Design Analysis Revision 0 Page 5 DA-ME-96-096

Measured Fpp Measured Fpp Valve 3.3 3.4 3.5 3.6 3.7 3.8 857A 247 lbs. 535 857B 498 lbs. 450 857C 513 lbs. 400

.'. A conservative Bounding F~ = 550 lbs, is used.

7.2.5 Disc Differential Pressure Load (FDp):

Disc Area (A~) = mDD 4

where DD = Disc Mean Seat Diameter, From Design Input 3.14, and Field Measurement; Dp 4 '"

Ap = ~pp 4.5 ' 15.9 inp 4

Fpp = 2 'g i cos(qh) PUs PDpiAAp

+ @sin(p) where: P~ = Bonnet Pressure = 614.7 psi P = Upstream Pressure = 147 psi (RHR Pump Side)

P~ = Downstream Pressure = 2.9 psi (Rx side) p = Disc Seat Angle = 0'Parallel Disc Gate Valve) p = Friction Coefficient = 0.5 (see below) p = 0.5 Based upon Measured Valve Factors per Design Inputs 3.6, 3.7, and 3.8 and qb = 0'therefore, p =

valve factor):

Valve p (open direction) 857A 1. 18 (see note below) 857B 0.356 857C 0.469 Design Analysis Revision 0 Page 6 DA-ME-96-096

Note: p = 0.5 is bounding for 857 B/C, the data obtained from 'A'alve was indicated to be suspect (based upon a low Dp used and no use of a Torque Thrust Cell). This value will be reverified during future MOV testing.

Design Inputs 3.6, 3.7, and 3.8 reflect the above valve factors which are based upon a nominal seat diameter of 4.0>> (yielding an area of 12.566 in ) .

These valve factors do not consider the stem rejection force or the torque reaction factor.

If the valve factors are adjusted for a mean seat diameter of 4.5>> (Design Input 3.14), and the stem rejection force and torque reaction factor are included, the adjusted Valve Factor values would be lower, thus further enveloping the 0.5 value.

FDp 2 614 7 147 2~9 0~5 15 9 cos (0) + (0.5) (sin 0)

FDp = 8582 lbs.

7.2.6 Tor ue Reaction Factor T~g:

DD TRp = 1 ( 2 .5 .0151 )(12) 4 5>>

TRp = 0.96 where: F, = Stem Factor taken as 0.0151 ft (based upon conservative use of 0.2 for coefficient of friction) 7.2.7 Total Required Force (TR):

Reference 4.1 utilizes the following equation to calculate the total force required to open the valves:

TR F + Fpp F + Fop~+F Design Analysis Revision 0 Page 7 DA-ME-96-096

The methodology of Reference 4.1 is very conservative, in that the Disc/Stem assembly weight load and the Packing Load are included in the calculation of total required thrust by the above equation, when in actuality these loads are already included in the unseating load (F,~) .

The second conservatism in this methodology is that the unseating force (F...q) is a measured value which already considers the Torque Reaction Factor (T~).

Removing these two conservatisms results in a calculated required thrust of:

Tg = (-913 + 8582) + 770

.96 TR = 8759 lbs.

7.3 Available Thrust (T)

Available Thrust is obtained from In-situ motor/actuator capacity tests. From Design Input 3.2 the 1004 voltage thrust capacity was measured to be 10,832 lbs.

Note:

An in-situ motor/actuator capacity test, was also performed on valve 860B. The 860's are 6" x 4" x 6" Anchor Darling Parallel disc gate valves with SMB-00-7.5 actuators and are identical to the 857's. Per Design Input 3.13, the available thrust was measured to be 11,016 (at 1004 voltage, no reduction for temp. effects). Since this value is greater than the 857 value of 10,832 lbs, 10,832 lbs. will be used to be conservative.

It should also be noted that these type of tests are not performed under complete motor stall conditions.. Therefore, there would be some additional thrust available.

The In-situ Motor/Actuator capacity tests include consideration of stem factor. As was previously indicated, the 10,832 lb. thrust used for this analysis was for the 857A valve. The following stem factors are obtained from Design Inputs 3.6, 3.7, and 3.8 as follows (Note: these are for Design Analysis Revision 0 Page 8 DA-ME-96-096

closed direction only, no accurate data for open direction is available):

Valve Closed Stem Factor 857A *0. 0117 857B 0.0107 857C 0.0089 The 'A'alve has the highest measured stem factor in the closed direction. It it will be assumed that also has the highest stem factor for the open direction.

Therefore, there is no reason to adjust the 10,832 lb.

value by the ratio of the stem factors.

7.3.1 From Section 7.2.4 add minimum running load (conservative) to calculate thrust available at control switch trip:

Tp ([gpss) 10'32 + 247 1 1 079 lbs.g 7.3.2 Reduction for equipment error (from Design Input 3.3, Section 4):

Eg 5 ~ 744'1 1 g 079) + 240 lbs ~

ER = 876 lbs.

Tp 1 1 g 079 876 10 g 203 lbs.

7.3.3 Consider Reduced Voltage and temperature effects R = 974 (conservative minimum from Design Input 3.12 for 857A)

From Design Inputs 3.9, 3.10, and 3.11 the temperature effect reduction is 1.5%.

Final Available Thrust per In-situ Motor/Actuator capacity test:

T~ 10'03 ( 97) ( 985)

~ ~

.'. T = 9456 lbs.

7.4 Acceptability (Operability)

T = 9456 lbs. > T~ = 8759 lbs.

Design Analysis Revision 0 Page 9 DA-ME-96-096

.'. Since the available thrust from previous in-situ motor/actuator capacity tests; considering equipment error, applicable reduced voltage and temperature effects considerations is greater than the calculated required thrust to unseat the valve (including bonnet pressure locking loads), the 857 A/B/C valves are considered operable.

Note: Per Reference 4.1 the limiting weaklink thrust value was indicated to be 9027 lbs.

Since 8759 lbs. < 9027 lbs. the weaklink limit will not be exceeded for the subject valves.

8.0 RESULTS 8.1 The total Required Thrust to open the 857 valves was determined to be 8759 lbs. This considers valve bonnet pressure locking conditions.

8.2 The minimum Avail'able Thrust based upon In-situ Motor/Actuator capacity testing was determined to be 9456 lbs.

8.3 Valves 857 A/B/C are considered operable since the available thrust exceeds the required thrust.

8.4 The Required Thrust of 8759 lbs. does not exceed the weaklink limit of 9027 lbs for the subject valves.

8.5 Conservatisms associated with this analysis which make it bounding, are as follows:

8.5.1 The in-situ motor/actuator capacity tests, performd on two valves out of the affected group, were not taken out to complete 1004 stall conditions. Therefore, can be assumed that some additional thrust would be it available.

8.5.2 The minimum running load measured for all valves from all current as-left available tests, was used to determine the 100% voltage available thrust. This results in an overall= lower available thrust for comparison.

8.5.3 In terms of a reduced voltage, the minimum for all valves and a slightly conservative value was used.

This results in an overall lower available thrust for comparison.

Design Analysis

~ ~

Revision 0 Page 10 DA-ME-96-0,9 6

8.5.4

~ ~ The maximum sealing load from all valves was utilized.

This yields a conservative calculated total required thrust.

Design Analysis Revision 0 Page 11 DA-ME-96-096 Date 9 19 96

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