ML20148A443
| ML20148A443 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/10/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8803180196 | |
| Download: ML20148A443 (84) | |
Text
- '
TENNESSEE VALLEY AUTHORITY CH ATTANOOG A TENNESSEE 37401 SN 1578 Lookout Place MAR 101988 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Hashington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - DIESEL GENERATOR VOLTAGE AND MARGIN ANALYSIS (DGVMA) REVISIONS
Reference:
TVA letter to NRC dated February 29, 1988, "Sequoyah Nuclear Plant (SQN) - Diesel Generators (DGs) - Operability and Analysis" The purpose of this letter is to provide NRC with additional information they requested during a discussion held among NRC, TVA, and their respective consultants concerning the DGVMA on March 2, 1988.
Enclosure 1 contains the revised sheets of the DGVMA (SQN-E3-015) regarding changes to the contactor pickup portion of the analysis. These changes to the DGVMA involve the use of the in-rush currents, verification of the affected circuits' fuse integrity, and evaluation _of slave loads occurring concurrently at the load sequence pickup steps. Also included in enclosure 1 is a discussion of the Allis Chalmers contactors and their effect during the DG load sequence. contains a discussion of the motor-operated valve- (including their function and identification) that were identified in ue DGVMA as having greater than 5 percent but less than 10-percent margin in their respective stroke times.
Furthermore, TVA has concluded that the contactor dropout and pickup test voltages, included in the DGVMA, bound the contactor analysis performed to support Branch Technical Position PSB-1.
TVA believes this information adequately addresses NRC's request.
If there are any questions concerning the information provided, please telephone Barry A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEE VA EY AUTHORITY R.
ridley, Di ector Nuclear Licensing and Regulatory Affairs
\\
Enclosures cc:
See page 2 g
8803180196 880310 DR ADOCK 0500 7
An Equal opportunity Employer
s U.S. Nuclear Regulatory Commission hdtdl 101988 cc (Enclosures):
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Mr. G. G. Zech, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Connission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379
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ENCLOSURE 1 Diesel Generator Voltage and Marsin Analysis (DGVMA) 1 t
M 1NAL DNE CALCULATIONS YVA 10697 (DNE 646, TITLE P LANT/ UNIT D LESE L G ENE R ATO R VOLT A GE i M ARG IN A N A LN S IS SAN U N lT S ( k 2.
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, f PRUARING ORGANIZATION KEY NOUNS (Consult RIMS DESCRIPTORS LIST)
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Rev (for RIMS'use)
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ao APPLICABLE DESIGN DOCUMENT (S) as -i.e B25
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SAR SECTION(S)
UNID SYSTEMIS) 6.3 R_
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Page 1 of 1 CALCULATION DESIGN VERIFICATION (INDEPENDENT REVIEW) FORM bQM - E S - CIS l
Calculation No.
Revision Method of design verification (independent review) used (check method used):
1.
Design Review 2.
Alternate Calculation 3.
Qualification Test Justification (explain below):
Method 1: In the design review method, justify the technical adequacy of the calculation and explain how the adequacy was verified (calculation is similar to another, based on accepted handbook methods, appropriate sensitivity studies included for confidence, etc.).
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Revision Nethod of independent review used (check one or more):
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of The purpose of this calculation is to establish the load margin for the diesel generators (DG) resulting from a bounding case evaluation of the auxiliary power system performance for design basis event loading.
Calculate the minimum voltages at connected equipment using this bounding case analysis to show that safety-related systems / components will perform their intended safety function when powered by the DG, with acceptable margin..
1.1 PROCEDURE The basis of this calculation are actual field test results of load sequence testing of all four diesel generators for SQN units 1 and 2.
l The DG data obtained by testing was analyzed for each load sequence step.
The minimum voltages at each step were compared and the lowest voltage for the step was selected to establish a worst case composite DG voltage profile for the 6.9KV and 480V shutdown boards.
During the diesel generator load sequence testing performance, it was not possible to fully load all the motors to their design basis load; therefore, the maximum voltage transients were not obtained for all the load sequence steps.
In order to determine the maximum transient voltage, the composite worst case test voltage transients were adjusted h -+e--for the maximum loading that would occur for a loss of of fsite power concurrent with a loss of coolant accident (LOOP /LOCA).
This maximum loading is called schedule loading henceforth.
The calculation modified the composite test voltage profile to produce a conservative voltage profile which accounts for the most severe bounding case evaluation of factors not enveloped by actual testing.
All of these bounding case factors do not occur simultaneously on any one diesel generator.
By determining a bounding case value for each factor, and then combining their bounding case factors, this' calculation provides a conservative estimate of some concerns.
However, it ensures that the analysis has provided a bounding case evaluation of all concerns.
From these adjusted worst case voltages, the worst case voltages were calculated at the 480V Motor Control Center (MCC), 460V motors, and 460 MOVs.
The cable drops used to calculate the above voltages were the worst cable impedance identified for each of the MCCs and loads to bound the analysis.
The cable drop evaluation and field test results are document in Appendixes F and A respectively.
The voltage analysis methodology and detailed calculations are documented in Appendix B.
Conservate factors used to bound the voltage analysis include the following:
A.
The composite diesel generator voltage profile based on the worst case load sequence transient voltage dips for all four DCs.
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B.
The scheduled load profile based on the worst case loaded DG (DG 2B-B).
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C.
The contactor dropout, pickup analysis based on:
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of all Mcc control circuits.
This results in a very conservative analysis since typical circuit length is 1500-2500 feet.
- 2) Smallest control transformer of 100VA.
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- 3) Combined load of one size 1 contactor, one solenoid, and one timer.
D.
Considers all running motors as constant MVA loads which results in a l
more severe voltage transient.
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E.
Does not consider the boosting effect of the running induction motors i
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providing a generator effect during a sudden drop of bus voltage.
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This effect should reduce the voltage transient.
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9 s &N - E. 3 - 0 \\ c; b Dcte 2 /23l8 8 Prepared h Octe 2 /2_1/ M ( Verified Sheet \\3 of 8.0 Results of Voltage Analysis and Determination of Available Martins The voltage transient can potentially effect the performance of the diesel generator systems and the components they power. The following sections discuss each of these items with regard to transient voltage effects on the components. The available margins between the anticipated transients and the components operation has been identified. 8.1. Diesel Generator Voltane Analysis -r Tables 1 and 2, attached, summarizes the results of the DG voltage analysis. The minimum 6.9 KV shutdown board voltage was determined to be 76.5 percent and the minimum 480V shutdown board and motor control center (MCC) voltage was determined to be 77 percent and 75.6 percent respectively both for approximately 16 cycles. The lowest motor terminal voltages are as follows: 6.6 KV motor 76.2 percent 460V Switchgear motor 74.3 percent 460V MCC Motor 74.5 percent 460V MCC MOV 74.6 percent A The calculations supporting these results are in Appendix B. P
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5 6LN - E 3 - 019 2/22/9 8 PREPARE 0 0 '.TE QHECKED h DATE 1/h[OP R_ Sheet '9 of TABLE 2 W o "<. S T, C A S E 480V ST M b. BO. VO L.~i AG E CORRECTED FOR SC HEDULE LOAb PRE 1R Ata pu dtP Abbm ou At To7 At pg uig, ptJ O t P but S E O TIME VOLT AG E Fit.t o To Labioc P U Ot P Bys vot.1AG l@ + @,J g l@-03 SEc. O PU g TEti sptfrietwct g 0
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Verified h Date 2/2319O Sheet n6 of 8.2 Effect of Random Loads TVA has determined that the DG should be capable of accorrunodating the application of a random process load block (i.e., sixteen loads that are controlled by process parameters such as flow, pressure, etc.). We have assumed that 14 of these loads are running and that tw'o of the largest loads are starting to calculate the additional voltage drop. The increase in the 6.9KV and 480V system transient voltage dip resulting from this random process load block is 1.9 percent, and 2.4 percent respectively. (See Appendix C) P a P 1 i e~,
s s. M - E 6 - O \\ */ Preper:J RM !;de 2hsl88 Verified b. Colo 2.,/2.4,/ F# ( Sheet M or n.is v:b: tin 1: d=r mied in A;;:ndir c. d0-8.3. Motor Starter contactor Voltate Martin In safety-related circuits at Sequoyah, size 1, 2, and 3 contactors are used. For Unit 2 operation, approximate number of each types of each contactor size are: Size 1 Approximately 500 (27 ampere rating) Size 2 Approximately 60 (45 ampere rating) Size 3 Approximately 15 (90 ampere rating) h All of these are of the same manufacturer, Arrow-Hart Incorporated. Size 1 contactors are supplied from smaller control power transformers than larger contactors and experience r lower per unit voltage. As such, the size 1 contactors are the limiting application; contactor dropout and pickup characteris+.ics of Size 1 contactors were investigated. Tests were performed at TVA's Chicamauga Laboratory using new and used contactors from SQN. These tests yield a minimum drop out voltage of 54 percent and minimum pickup voltage of 73.6 percent on a 110V base. The corresponding required voltages on a 480-volt base are 49.5 percent and 67.5 percent respectively. t i -,,,, -, - - +,-
Sheet IB __g_ gonclusion: ( 1. Dropout The limiting MCC contactor circuits are those with seal-in contact design that would require operator action should dropout of the contactor occur. These contactors are manufactured by Arrow-Hart. M The ERCW MCCs, which use Allis-Chalmers contactors do not have seal-in contact design and the loads are either manually operated or have their power circuits doenergized. Therefore, the Allis-Chalmers crmtsctors are not the limiting case. Using the minimum adjusted test voltage from Appendix B the minimum adjusted voltage anticipated at 480V McCs is 75.6 percent; therefore, the minimum margin is 26 percent above the required voltage of 49.5 percent (54 percent on contactor base of 110V). 2. Pickup The pickup analysis has been revised to (1) evaluate the worst case actual MCC contactor circuit that would be required to pickup at t=0 seconds of the loading sequence or concurrent with the starting of a 6.6 XV motor during the loading sequence and (2) to evaluate the worst case MCC contactor circuit for maximum current to ensure that its control circuit fuse will not inadvertently interrupt. For item 1, all slave loads were evaluated and the worst case circuit was determined to be a MOV that would start concurrent with the auxiliary feedwater pump motor at the 20-second load step. This circuit consists of six relays and two lights drawing holding current, and the inrush of the contactor coil. The minimum adjusted voltage anticipated at the 480V MCCs is conservatively calculated to be 84 percent when the MOV contactor closes concurrently with the D 20-second load step. This voltage is above the required contactor voltage of 74.3 percent (73.6 percent on a contactor base of 110V). Therefore, the minimum voltage margin is 9.7 percent. This is conservative since the contactor voltage would be higher as the MOV contactor picks up at the same time as the 6.6 KV motor (i.e. before l the voltage drop due to the locked rotor impedance of the motor). For item 2, all circuits powered by the diesel were evaluated to determine the worst case circuit to be a room cooler fan that is energized at t=0 of the loading sequence. This circuit consists of a i solenoid and a contactor coil both enetsizing at the same time. The I resulting maximum current for this would be 3.23 amps. The control circuit fuse is a FRN 1 amp fuse which requires 8 amps for.1 second in order to interrupt. Therefore, the minimum margin is 59.6 percent at 1 second. Therefore, the fuse will not inadvertently interrupt. This analysis is conservative since the amperage at rated voltage was used as opposed to the reduced amperage at a lower voltage. / ',,.-.,.n__tN A ' 38)21t DNE4 - 2232w U E oAl Ode N BI"" - - - Ve ri L %,, - -
s aw. E b O Lc; b Octe zl2MS 8 Prepored d Oc!e 1/11,/c c-Verified ( v Sheet M of _ 8.4. Motor Operated Valve Torque and Time Martin All MOVs that would be actuated during the loading sequence for a design basis event were evaluated for increased stroke times due to transient voltage dips. All MOVs under consideration are rated for a minimum start voltage of 77 percent
- and can develop 100 percent torque at this voltage.
Since there is more time above 77 percent than there is below 77 percent (more over-travel than under-travel) in the travel time, it is more appropriate to examine the average voltage. The average voltage experienced based on the adjusted load conditions for the loading ~ sequence is i approximately 95 percent; therefore, the voltege margin is 18 percent. In addition, all MOVs required during this time have a minimum of 5.3 percent margin in their stroke times. This was determined by 4 the design criteria safety limit minus the plant testing results i which results in the following: of the 58 valves under l consideration, 37 have greater than 100 percent margin, 18 have greater than 10 percent margin but less than 100 percent, and 3 greater than 5 percent but less than 10 percent margin.
- This value has been adjusted from 80 percent on a motor base of i
460V to 17 percent on a system base of 480V. j
s & M - E 'S - 0 $ U Date 2l2Ns a Prepared-Verified N - Dale S! E& ( Sheet 2o of t 8.5 Overcurrent Protection Martin Due to transients during the loading sequence, all switchgear motors have their overcurrent protective devices set at a minimum of 200 percent of locked rotor current to ensure that tripping will not occur. Additionally, the load will not trip inadvertently since the transients under consideration are less than one second in duration and actuation is at least 10 seconds. 8.6 Diesel Generator Load Sequence Timer Martin i In order to determine the load sequence timer margin calculations "27SIA" and "DG TIMER RELAYS" were reviewed. "DG TIMER RELAYS" (Reference 3.9) addresses the effects of sequence timer inaccuracies upon DG loading by calculating the minitmam time between load steps. Calculation "27SIA" (Reference 3.17) calculates the maximum time it takes to make electric power available to the sequenced loads. Both calculations are based on the methodology presented ISA 67.04, "SETFOINTS FOR NUCLEAR SAFETY-RELATED INSTRUMENTATION USED IN NUCLEAR POWER PLANTS" and Reg Guide 1.105, "INSTRUMENT SETPOINTS FOR SAFETY-RELATED SYSTEMS." l
SQN-Eb-OM O~M Date 2 l2 S l88 Prepared h Dole 2 b2f?! Verified ( Sheet 21 of "DG TIMER RELAYS" calculates the minimum time interval between loadings by calculating th) root-sum-square of (square root of the sum of the squares) the random errors - associated with two adjacent relays. The root-sum-square technique is addressed in ISA 67.04. Also note that there is one systematic error associated with these relays, a bias error due to anbient temperature changes. Since all relays are located in the same cabinet, all relays will experience the same ambient temperature changes; therefore, this effect cancels out for adjacent sequence timers. The results of this calculation are summarized in Figure 2. "27SIA" calculates errors associated with each timer in turn (errors calculated for only one relay rather than adjacent relays) since the parameter of concern is maximum time required i to make electric power available to a particular load. This means the bias error associated with temperature must also be i included in the accuracy. The results are for a concurrent loss of offsite power and safety injection initiation, and are sutuarizied in Figure 3. These calculations previously resulted in a change for the auxiliary feedwater and component cooling system timers and these I figures reflect this change. 1 i
DIESELLOADSEQUENCING so. es-ois t Figure 2 PeroaOCDM E 2-E -eB. CHICMEO d D ATE 2-N-o o s
SUMMARY
OF "DG TIMER REL AYS" R J Sheet 22 of $6f 'ketf Nf W h$6 10tkk 4.48-1.51 13.4+ d6.56
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43.12 267.36-272.64\\ 1.96g pi.04 17.flg g!!.tl / Yariat en 1.68g 421 2 161.tig pli.72 y g g y o o 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 < !n,tervals i i,, 1.68 2.44 3.84 3.13 2.4 6.15 131 !!.4 (-gga 1) W 1) i' 11) 3I 1: 0 218 140 $fD ($ICCet) Variations about ideal setroint are shwn for algebraic error combinations. Minimm interval times sMwn are for Stuare Scot of th Sm of th Squares (SR$$) ccmhinations of errors (Pt 42H timers) Figure 3
SUMMARY
OF "27SiA" i~ TN 'le# 1# 9F Ta "iler 9,# Mi ~ o n u e u u ii .tu (... e noie i
- .t.25 12.5 16.25 21.85
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Table 3 sunnarizes the voltage transient effect on motor starting time and its effect on load sequence time interval including timer accuracy and repeatability. The analysis in Appendix D l accounts for the overlap of acceleration between the Si and CCP for the worst case. TABLE 3 6.6 KV MOTOR ACCELERATION TIME I I I I I l lWORSTCASEl MIN. TIME l ACCELERATION TIME l l lMOTORTERMl INTERVAL l l l l l l MOTOR lVOLTAGEPUl SEC l MEASURED l MIN.YOLTFOR l100% RATED l MARGIN l l l6.6KVBASEl (C) lFROMTESTlFIRSTONESEC l VOLTAGE FOR lBETWEEN l l l l l IN SECS l&100% AVERAGE lTHEENTIRE l3&5 l l l l l lTHEREST,SEC l PERIOD l SEC l l l l l l l SEC l l l l l l l l l l l (1) l (2) l (3) l (4) l (5) l (6) l l l l l l 1 I I l lCCP l 0.867 l 2.44 l 2.15 l 3.33 l 2.99 l l l51 l 0.833 l 3.84 l 2.80 l 3.39 l 3.01 l 0.45 l { lRHR l 0.811 l 3.13 l 1.83 l 1.85 l 1.39 l 1.28 l lERCW l 0.782 l 2.4 l 1.56 l 1.67 l 1.20 l 0.73 l lAFW l 0.778 l 6.25 l 3.46 l 3.17 l 3.22 l 2.48 l l CSP l 0.798 l l 2.56 l 2.79 l 2.35 l l l I l l l l l l TIMER INACCURACY / 2,44 / 2 l 5 l l MINIMUM INTERVAL TIME ACCOUNTING FOR TIMER INACCURACT Margin is not appilcable since CCP and SI purrp rrotor starts could overlap; however, this condition has been considered in the Appendix D and it has been estabtished that this overlap will not cause any additional drop over what has been observed during testing. I 5 6L N - E 3 - 015 M Octe 2/23/88 Preperc-d Verified Date 2/ 43 Rg i / 8 V 8 / i Sheet M _ of 1
s aw - E S - OW Prepared god Date 2l2M88 Verified d Date 2 /23/P R v-u (. 54 et...$ Of,_. 8.7 Diesel Generator Capacity Chart 1 shows a comparison of the ratings for the diesel generators to the maximum anticipated scheduled load for the heaviest loaded diesel generator (2B-B). In summary, it shows that there is at least 8 percent margin between the manufacturer's rating - and the maximum scheduled loads for the first 2 hours and at least 2.3 percent margin for greater than 2 hours. This is acceptable margin since the maximum load must be less than or equal to rated capacity. I 8.8 Motor Voltage Martin In order to ensure that the motors powered by the DC during the worst case design basis event have adequate voltage for starting and/or running, a review of the 6.9KV and 480V motors speed-torquo characteristics was performed. This review evaluated the unique types of 6.6KV and 460V motors (e.g., safety inj ection pump, centrifugal charging pump, motor operated valves, etc.). Using the basic relationship that torque for a motor is proportional to the square of the voltage (See ANSI C50.41, paragraph 11), we con determine the minimum voltage required to e sustain pump motor speed and the minimum voltage required to sustain breakaway.
S EN - El - O IS 2 l23 / 8 8__ GM Date Prepared Verified Date 2/2 t/d ( Sheet M of Below is a pump / motor speed-torque curve for the SQN containment spray pump that displays these pertinent characteristics. This curve is typical for NEMA Class B motors which are used at SQN. TYPICAL PUMP / MOTOR SPEED-TORQUE CURVES FIGURE I f5300 LB FT MOTOR TORQUE AT RUN f SPEED AND 100% RATED VOLTAGE 5000-4000 - MOTOR TORQUE AT { 100 % VOLTAGE 3000 - 260C 2000 LB FT. MINIMUM MOTOR w s [ TORQUE TO SUSTAIN SPEED ? l *. PUMP TORQUE + 4 MINIMUM START + TORQUE FOR MOTOR + TO SPIN PUMP 1000 - l w ", REQUIRED MOTOR + x TORQUE CURVE TO i START PUMP SPINN REQUIRED MOTOR g i TORQUE CURVE TO + +.., pea PREVENT STALL i 0 8 8 8 8 8 8 o s s e e ~ ~ SPEED IN RPM 1
( For 6.9KV motors and a very large 460-volt motor, the analytical technique resulted in the following: MOTOR MINIMUM SUSTAINING MOTOR VOLTAGE MlNIMUM BREAKAWAY MOTOR VOLTAGE TO SUSTAIN ROTATION TO SUSTAIN ROTATION (Percent V at Bus) (Percent V at Bus (Locked Rotor) CCP 64 33 SI 54 32 RHR 56 37 ERCW 63 36 AFW 55 35 CCS (480 Volt)* 44 29 CSP 59 27
- At motor terminal The small 460-volt motors are standard NEMA designs; therefore, the i
minimum start and sustaining voltages are evaluated utilizing the standards from which they are designed. NEMA MGl-12.37 and 12.38 were used to obtain the locked-rotor and breakdown torque values for ( design types A and B motors for various horsepowers. "Motor Application and Maintenance Handbook" edited by R. M. Smeaton was used to obtain typical data for the pump, fan, and compressor loads. This data corresponds to the points of interest for the motor / load speed torque curve. I l i g. F._3. O W g Prepared M Dole El"N 8 Verified b Date *[2-1/RR v 4 l Shce L 26 cf ~ % i
( In conclusion, motor loads have been evaluated to determine the maximum voltage dip which still allows adequate torque to sustain the load rotation. For the 6.6KV motor, the limiting voltage for running motors was detennined to be 64 percent, and the limiting breakaway voltage was 37 percent. For 460-volt motors the limiting voltage for running motors is 68 percent and limiting breakaway voltage is 59 percent. In addition, for a 460-volt motor / pump load, calculations i predict additional margin in the rotating inertia of the load with the occurrence of short-term voltage dips (e.g., for 65 percent percent for 1/2 second, speed drop of the low inertia pump would be less than 6.18 percent). TVA sees no adverse effect on the mechanical system performance since the thermal and mechanical inertia is such that a 1/2-second decrease in flow of air or water would have effects that would be within the normal operating fluctuations of these types systems. This assumes the associated motors and controls do not trip as a result of this voltage decrease. Therefore, the minimum 6.9KV margin for the maximum i expected voltage dip is 12.5 percent of 6.9KV and minictum 480V margin is 6.3 percent of 480V. j SGN - E3 06 i. Prepared GM Date T h3 ISS / Verified h Date ~L/M,/ P. P. g-Sheet 27 _ of __
Shee 28 of 9.0 conclusions f TABLE 4
SUMMARY
OF MARGINS COMPONENT PERCENT MINIMUM MARGIN 6.6 KV MOTORS - SUSTAIN /BREAXAWAY 12.5/39.5 460V MOTORS - SUSTAINING 6.3 CONTACTORS - DROPOUT 26.0 CONTACTORS - PICKUP 9.7 RI FUSES - CONTACTOR PICKUP INRUSH 59.6 MOV PERFORMANCE AND STROKE TIMES 18 (Voltage)/5.3 (Time)/56 (Torque) DIESEL GENERATOR LOADING 2.3 Based on the summary of margins listed above in Table 4, we have detemined that the diesel generator will perfom its intended safety [ function by r+-arting and accelerating all required loads within the required li ',s, with acceptable margins. The margins are not only sufficient t. allow for test inaccuracies, but provide the capability for the DG to start and accelerate all required loads concurrent with the random process load block. Furthemore, it is concluded that the test results have been bounded by analysis and the DG meet the intent of Regulatory Guide 1.9. i NS,N Prepared f 34-Date Verified O Date MBl8B j
TVA 469H (EN DES-2 78) TENNES2EE VALLEY AUTHORITY CHett H1 or sus >Ecv DG V o LT A G E AND M ARG\\N A N A LN S l S PROJECT SQN S &M - E. 3 O n cy I (3[m L// 8 / 9J couevno sv Ctbl 2 l 18188 cats cHecuso sv cart A P P E. N D l X - H co N T ACTOR PlC K UP VO LT AG E (
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- 1. O PURCOSE THE puAPOSE CF THlS AUALNSLS IS AS #CLLOWS:
- l. TO E. VALUATE FE WORST CASE ACTUAL MCC COMTACTOR CIR Cult s l IU TERMS OF LOAD AUD CIRCulT LEWGTHhTHAT wouLD BE REGutRED TO plCKUP AT T: O SEcouD oc THE LOADiMG SEQUEUCE. OR COUCURREhJT WITH THE STARTtuG CF A fo.lo KV MOTOR DURIUG THE LoAolWG SEQUELICE, Aup I
- 2. TO EVALUATE THE WCAST CASE MCC CIRCulT FOR MAylMUM CURRE tJT TO EU SURE TH AT 1.TS COUTROL CIRCUlT FUSE IS AD6QUATELY SELECTED, i
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I SHEET H-6 SON-E3-015 REV 1 PREP 6 RED __6d.$____ DATE_J/#f8L C H E C K E D _ _,.G {>)_ _ _ _ _ D AT E _3_{3d3.3 5.0 PROCEDURE 1. Pickup analysis Evaluation of the mcc contactor circui ts were pef ortred in two parts. Part I was to evaluate the circuits that would be auto initiated at t=0 of the loading sequence. These circuits are identified in calculation EON-E3-OO2. The evaluation of these circui ts dctera.ined that these circuits were not limitino because 1) at trO t h er e are no 6.6 KV mctors starting. thercftre the 6.C MV voltage is approx i mat el y at nominal. 2) the DG tested lod d et t=0 was greater than the schedulad load and no prublem occured due to c on t ac t c.r pickup, and 3) because trie 4GO V board voltage takes approx i matel y 30 cycles to ramp up to approximetely 80 percent of nominal, due to the en er g i n e t i or-of the t900/4E0 V transformers. all requireci mcc contacters w.;ul d pickup -i t this time. i Part 2 wee to usaluate the circuits that receive the same s start signals and permis.sives es the 6.6 RV sequenced loads. Th-sct ee.n t 2 c +1 nn+nt sr y diaorems were reviewed to identikp a]1 iaede ct;ited c2 c ul L,neous 1/ w.s th tiie 6.e UV motcr5. Devices slaved f r an tnese major loadc thet have ti me celevs areetieleJ w2 Ll: Llie start were not iiiciuded as the DG will have tin ~ to re.nser prict to t h e.1 r start. Also Icads that receive the =. e m e start but not the permissives were not include) :ecause thc would be loaded prier to these load secuences (2e, . wive open on the SI signal at t=0 but thei pumpb wel t for their load uequence timer to start them). These concurrent star ted loads ar e listed on page H27. These circuits were evaluated for number of comuonents in parallel with the starter, operation of the components (ie, inruch or holding cu rent), total circuit length. This i n f er rna t i on wie s contained in calculettion S??J-AF5-010 and the 4SOV schemat:.c.s. The worqt case circuit w a s: determined to be r10V FCV-3-il6 that woul d t.t a r t concurrent with the au;:i l i ar y feedwater p _tm p motor at the 20 second losa step and c o n sit u t e of 6 relavs and two indicatino lights drawing liol di ng c ur r ei s t and the i n r u e.h of th? contector coil with a total circuit lenght of 22.'4 + et-t. 2. Luntrcl 1rtutt f-u. a E veul ata en Evaulaticit of tlie mc; control circultn to determine the worst case in te mi of ma.imum cur r c nt on1/ we per+ormad in a nimilar omr e aw dezcribed in item 1 abose with ttie e; tr.t : o e ihot coble 1 et ioli t we s tu s a cens t det etlon. The norat
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47 of Shoot S Q N. E3 - O \\5) ( 669 roo:n cooler fan that is energized et L=0 of the loading sequence and consists of a solenoid and a contactor coil both energining at the name time. ? Prepared EM Date 3 '?l2R Verified (. Pa l Date 1iB133
~.. 7VA 489H (EN DES 2 78) TENNESSEE VALLEY AUTHORITY swret BB or SUBJECT PROJECT SG N - E3 - 015 courviso SY (,} } oATE d[h(h CMSCMED BY C f'M OATE d $lg{$$ { ( 4 i t-6.0 COMPUT ATio N / AN AL4 SIS [ t 6.t P ! c k. U P THE R E V t E va of con 1ROL c t qc u tTs ytw ic u ARE Plqu) RED b y R tt4 G bd Lt A b t 4 G REVE ALE O. TwE l 4 ERCW HbR ISOL V At V E (. F C V t \\ G A) AS.THE i NORST CASE CON 1RO L C LR Cul7. THIS C IRC u t i CO N S tST S I y 1 0F THE F o L L OW i t4 G : [ ii 9 INRUSH QC STARTE2. l O ONE T t M E.R tMb 5 RE L AM S HOLb14G. TkESE I DEVtCES ARE P i c k G. D U P P kiO R TO 7ME E N ERG 12 AT16N f r + 1 or s1ARTEr* l I i f
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VVA 489M (EN DES-210) TENNESSEE VALLEY AUTHORITY suter M) eir 6 TARTER CICK UD VOLTAGE enoJrci SQU sue;tcT SGU -63 OlG C'fE 3/5/S8 DATE 3f6[$$ courvito av 8 J-}- patt CHacuto av [ .6.0 PEsuLTS AUD COUCLUSIOUS Fog ptCKu p, THE WORST CASE CIRCulT WAS DETERMlWEDTO SE Au MOV TH AT WOULO START COUCU RREMT WITH THE AU'XlLIARY FEiECWATER pump MOTOR AT IHE 20 SECOUD LCAO GTEP AMD COMSISTS CF G RELA'YS AUD Wo L lGHTS. DRAWING HOLDIMG CURRENT. AND THE I URUSH CF THE COUTACTOR Coll. THE LilWIMUM ACUUSTED VOLTAGE AUTICipATED AT THE 480V I MCC 16 CousERVATNEL:Y CALCU L ATE D To BE 84 PERCEUT WHEM W.E MON CCUTACTOR CLOSES COMCURREUTLY WITH THE 7.0 GECOUD LCAD 6TEP. THis VO' TAGE IS AeoVE THE REOu1 RED CDUTACTOR VOL1 AGE Oc 74 3 FERCEUT (13.6 pERCEMT CU A Cot! TACTOR EASE OF llOV). THC-REPORE, THE MlulMUM VOLTAGE MARGIU 16 97 PERCEMT, CEALIElWG THAT THE CouTAcioR vCLTAGE ACTUALL'y WOULD 55 HIGHER BECAUSE THS MOV COUTACTOR WOULD plCKUP AT THE SAMs Time ( A6 1H5 lo.'o KV MOTOR AUD BEFORE THE VOL.TAGE P9op6 OUE TO M LOCKED RM IMPErmuCE cp THE MOTOR.
TVA 489H (EN DES 2 78) TENNESSEE VALLEY AUTHORITY CHrer M2 or sueJtcT STA RTER DICKUD N/Ol5 AGE PaoJacT MW JOM-63 Ol5 c "' c " ' " " ' C+3 ^ 6J-J 31 SI 88 3/s/88 co n uteo e'
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9 ,Sau - E 3 - Ol G, h-H '2.~5 g. Correction Of Contactor pickup Voltage k Due to Variation of Generator Impedance The profiles of various voltage and current characteristics of DGlB at the start of ERCW is shown on attached Figure 5 reproduced from field test traces. The voltage profile VT indicates that at start there is an initial sharp drop followed by a slow drop over about the next 15 cycles. The initial drop is basically limited by the generator direct axis subtransient reactance 1"d and the slowly dropping part by the generator direct axis transient reactance I'd' Our voltage dip calculations are based on worst case drop which corresponds to the drop at the end of the slowly decaying period. At the start of a 6.9kV motor, the associated 480V motor contactor will pick up by the end of the initial sharp drop and much before the bus voltage reaches the bottom. For example under scheduled load condition, while the worst case maximum voltage drop on the start of the AFW pump is 0.196 pu at the 480V Bd, the associated 480V contactors will pick up before this drop. From Reference 3.15, the generator X"d =.242 and X'd =.148. I The initial drop = 0.148 X 0.196 = 0.12 pu. i 0.242 l Thus, the voltage available for contactor pickup is 0.975 - 0.12 = 0.855 pu at 480V. From Appendix F, the worst case drop between the 480V board and 480V HCC = 0.014 pu. So the worst case minimum voltage available at 480V MCC l = 0.855 .014 = 0.84 pu on 480V base. l l t l '! e pa.' e o Octn 3 [ Q-[R Q t -. m..v. __ __CLf4__ D e t o bi % iBa i ? l l DNE4 - 2245W 1 l l
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02/16/1933 16:02 TVA CLSB 615 697 4319 P.02 El3 8,8 0 2 1 6 002 TvA 44 (05 045)(CP.W8 5 45) 1:Nrrso sTNres covEttNMENT hi CM OTd M d LtM TENNESSEE VALLEY AUTHORITY W. S. Rau6 ley, Chief. Electrical Engineering Branch, DNE, WB C126 C-K h TO R. L. Morley, Chief, Central Laboratories Services Branch, LA PSC 1-C FROM DATE February 16, 1988 VOLTAGE PICKUP TESTS FOR ARROW-HARI CONTACTORS
SUBJECT:
The attached report is a sumary of data gathered at the Central for Xen Greene, Division of Nuclear Laboratories Services Branch (CLSB) This data is needed for evaluation of contactors at Engineering (DNE). Sequoyah Nuclear Plant. If you need any additional information, please contact me at extension 4317 or Jerry Worceley at extension 4337. 5 W-E3 0\\*/ RLM: JAW:SWH Attachments N28 ec: RIMS, MR 4N 72A-C J. K. Greene, W8 C144 C-X l e f ! !'N ~" ~ a'
02/16/1933 16 03 TW CLSB 615 697 4319 p,e3 89 5AN-E'S O\\C; PICKUP VOLTAGE REPORT FOR SEQUOTAH NUCLEAR PLANT ON ARROW-HART CONTACTORS 1 i i i j M [J.A/Wormsley.Engineef k f.B.Hagsdtle.Jf.,QA/QC u.n.,1.r.Cyc.Cu,,
02/16/1963 16:03 TVA CL93 615 637 4319 P.04 S qu-E3 -otty ( H30 I INVBSTIGATION OF CONTACTOR PICKUP VOLTAGE FOR ARROW-HART CONTACTOR The Central Laboratories Services Branc'h performed tests for the determination of dropout voltages for certain Arrow-Hart contactors for Sequoyah Nuclear Plant. These tests were requested by Ken Greene of the Division of Nuclear Engineering on February 12, 1988 and were performed on February 13 and 14 1988. All work performed in conjunction with this test was accomplished with the CLSB Quality Assurance Program which complies with all applicable requirements of 10 CFR $0/ Appendix B and ANSI N45.2. Defects are reported in accordance with the requirements of 10 CFR 21. Tests were performed on seven samples. Five were contactors that had been removed faom the plant and two were from the plant storeroom. The storeroom's contactors were returned to the plant; one contactor was held at CLSB for other investigations, and the others were returned to Ken Greene. The contactor under test was mounted in an approximate vertical position and the voltage. coil current, and contactor conditions monitored. The data for each contactor tested is provided in table form in TABLE I through TABLE VII. The instrumentation used for this test were: DESCRIPTION MANUFACTURER MODEL USTVA# CAL. DATE DUE DATE Digital Multimeter Xeithley 197 548489 1-16-88 3-16-88 Digital Multimeter Keithley 197 548501 11-25-87 2-25-88 Digital Stopwatch Micronts 63-5009A 902653 10-1-87 10-1-88 Glass Thermometer ERICO ASTM-17F S/N83388 2-12-88 2-12-89
02/16/1963 16:04 TVA CLSB 615 697 4319 P.05 S qu.E 3. otry ( N3I TABLE I SAMPLE 1 (Removed from plant service). VOLTS APPLIED DWELL TIME COIL CURRENT COMMENTS 45 10 sec. 558.5 ma No pickup 50 10 619.5 " 55 10 679.2 " 60 10 743.3 " 65 10 803.6 " , hum 70 10 865.1 " 75 10 930.1 " 76.8 " Pickup, buzz, latched 80 75 10 930.0 " No pickup, hum 76 10 940.8 " 72.3 ma Pickup, buzz, latched 77 77 10 954.9 ma No pickup, hun 78 10 965.1 " 79 0.5 sec. 75.0 ma Pickup, buzz, latched 79 10 sec. 973.4 " No pickup, hum 76.4 ma Pickup, buzz, latched 80 80 76.5 " 76.6 " ( 80 76.4 " 80 79 10 sec. 073.8 ma No pickup, hum Avera6e temperr.ture during test: 71 degrees F. l f i
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02/16/1958 16:04 TVA CLSB 615 697 4319 P.06 l l s qw. E 3 - 0 \\$ ( TABLE II H 3 QL SAMPLE 2 (Removed from plant service). VOLTS APPLIED DVELL TIME COIL CURRENT CONNENTS 45 10 sec. 558.7 ma No pickup 50 10 623.3 " 55 10 $86.1 " 60 10 749.0 " 65 10 811.3 " , hum 70 10 871.8 " 75 82.1 " Pickup 70 10 874.8 " No pickup, hun 71 10 883.9 " 72 77.5 ma Pickup 72 10 896.8 ma No pickup, hum 77.2 " Pickup 72 78.9 ma 73 78.6 " 73 78.8 ma Pickup 73 Average temperature during test: 71 degrees F. 6 w - -, - - - - --.n..---.,, ,c. -,--,--,m,ma-
02/16/1993 16:05 TVA CLSB 615 697 4319 P.07 S fo a. E 3 - O \\*/ ~ DBLE IH H% SAMPLE 3 (Overlabeled Arrow-Hart, from plant stcreroom). VOLTS APPLIED DWELL TIME COIL CURRENT CONMENTS 45 10 sec. 564.6 ma No pickup 50 10 626.7 " 55 10 690.2 " 60 10 753.6 " 63.0 ma Pickup, loud buzz 65 65 1.3 na
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No pickup, hum 60 10 sec. 61 10 i65.7 " 62 10 776.2 " 59.8 " Pickup loud buzz i 63 l 63 60.0 ma 63 59.6 " l 63 10 sec. 787.e " No pickup, hum 61.2 " Pickup, loud buzz 64 64 10 sec. 798.4 " No pickup, hum 62.8 " Pickup, loud buzz 65 65 62.3 " 65 62.2 " 65 62.3 " l i r Average temperature during test: 72 degrees /. i f i k f
9 02/16/1989 16:05 TVA CLSB 615 697 4319 P.03 son.E3 Ot9 TABLE IV N34 SAMPLE 4 (Overlabeled Arrow-Hart, from plant storeroom). P VOLTS APPLIED DVELL TIME COIL CURRENT COMMENTS 45 10 sec. 571.2 ma No pickup 50 10 636.5 " 55 10 698.5 " 60 10 760.9 " 65 60.4 ma Pickup, buzz 60 10 sec. 760.1 " No pickup, hum 61 10 772.7 " , loud hum 62 10 783.5 " 63 10 794.7 " 58.0 " Pickup, buzz 64 6a 10 sec. 805.4 " No pickup, hum 64 58.6 na Pickup, buzz 64 10 sec. 805.1 " No pickup, hum 65 60.2 " Pickup, buzz 65 10 sec. 816.4 " No pickup, hum 65 10 816.2 " 66 10 828.3 " 66 10 829.3 " 66 60.7 " Pickup, buzz 66 61.7 " 66 60.3 " 66 10 sec. 828.1 ma No pickup, hum 67 63.0 " Pickup, hum 67 62.9 " 67 63.1 " 67 62.9 " Pickup, no hum I 67 62.8 " 57 62.9 " Pickup, buzz 67 62.9 " Pickup, hum 67 62.8 " Pickup, no hum Average temperature during test: 72 degrees F.
02/16/1953 16:06 TVA CLSB C15 697 4319 P.09 SQ N-E3 - 019 k I TABLE V SAMPLE 5 (Labeled Federal Pacific Elsetrie; removed from plant.) VOLTS AfPLIED DWELL TIME COIL CURRENT COMMENTS 45 10 sec. 567.5 ma No pickup, hun 50 10 " 630.5 " 55 10 694.4 " 60 10 " 756.5 " 65 10 " 820.3 " 70 76.2 " Pickup, buzz 70 76.2 " 65 68.2 " 65 68.3 " 65 10 sec. 821.6 na No pickup, hum 66 70.1 " Pickup, buzz 66 69.9 " 66 69.8 " 66 69.9 " 66 69.9 " Pickup, buzz Average to.mperature during test: 72 degrees F. (
22/16/1983 16:07 TVA CLSB 615 697 4319 P.10 5 au-E3 - 0\\S ( TABLE VI H 36 SAMPLE 6 (Mechanical lockout device tied to Sample 7 and reset to rest against Sample 6). VOLTS APPLIED DWELL TIME COIL CURRENT COMMENTS 45 10 sec. 561.9 ma No pickup, hum 625.7 " 50 10 " SS 10 688.6 " 60 10 748.4 " 65 10 812.8 " 70 10 875.9 " 75 10 704.7 " Pickup no latch. loud buzz 80* 88.2 " Pickup, latch, buzz 80 10 sec. 741.8 " Pickup, no latch, loud buzz 80 10 743.4 " 89.8 " Pickup, latch, buzz 81 81 10 see. 749.8 " Pickup, no latch. loud buzz 81 10 749.4 " 91.4 " Pickup, latch, buzz 82 82 91.4 " 82 91.2 " 82 91.2 " i 91.2 " 82 83 93.4 " 81 89.6 " 81 89.4 " 81 10 sec. 748.1 " Pickup, no latch, loud buzz 89.1 " Pickup, latch, buzz j 81
- NOTE: Delete-not mechanically reset to rest on Sample 6.
Average temperature during test: 72 degrees F. l l t
\\ l 02/1G/19ES 16:07 TVA CLSB 615 697 4319 P.11 i ( S &N - E S - O\\ 9 TABLE VII H 37 SAMPLE 7 (Mechanical lockout device tied to Sample 6 and reset to rest against Sample 7). VOLTS APPLIED DWELL TIME COIL CURRENT COMMENTS 45 10 sec. 566.6 ma No pickup, hum 50 10 629.7 " 55 10 692.3 " 60 10 756.3 " 65 10 818.4 70 10 881.7 " 75 10 689.2 " Pickup, no latch, loud buzz 80 10 sec. 726.9 " 85 100.8 " Pickup, latch, quiet 81 93.7 " 81 93.8 " 81 93.9 " 81 93.7 " 81 94.6 " 80 92.8 " 80 92.8 " t 79 10 sec. 718.9 " pickup, no intch, loud buzz Average temperature during test: 72 degrees F. l l i - _~ - -. - -. -
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- Tr.ese oevces ep.ov a seres rnstar Neon type indicanng fights nave the advantage of excep-tionally long hfe regardless of tne seventy of ooerating
[ Conditions. The levei of dlumination. however, is muCn less than tne transformer or resistor types. 'ne tamp usec in ( neon units emits a low intensity hgnt wnsen is strong in the 4 I rec soectrum. Because of this, they snould be used with c: ear or amce* plastic or glass lenses onry. An internailean resister connectec across the lamp prevents nuisance hgnting DV ine cacacitve e+fect of long knes. The above tame hsts the voitages avadacie for eacn of the Prestest Indicating Ughts - NEMA 13 three types a ong witn tne power ratng and tne lamp nom-p g Cating lamp Coeration. They provide a positive, quick incicating hga.ts can Oe supphed with eitner a p!aste or a means of enecking the tamo without remcving the lens. g: ass tens. The g! ass tens noicer is copcer-nicxel-cnrome Depreseg the lens cisconnects tne tamp from the control p:atec brass. Bctn types of tenses are avadacie in red. circuit and reconnects it to a contnuously energized test-green, ameer. blue, clear anc wntte. ing circuit for immeciate incicadon of a faulty tamp. A sin- ; gle poie, doucle throw, momentary contact switen witnin All three types of indicating hgnts are avadable for either tne lamp disconnects the hgnt from the control circuit to one note or case me ;nting. Terminais are serrated pres-prevent feectack during the test operation. The prestest ; sure tyce with screw anc captive sacc:e ciamp. tesa.ig circuit is NC and the indicating hgnt circuit is NC. A Buna N syrathetic ru0 Der lens gasket prevents od and Two types of prestest indicanng lights are avadable: caer contaminants from entenng tne lamp unit. This gas. e a transformer type for ac operaton only i A+ is in accition to tne stancarc gasket tetween oprator e a resistor type for ac/dc operaton i anc panet Both types can bc sucolied with ettner a piastic or a glass lens in six colors: red green, amber, blue, clear or wnite. The lens notder is corrosion resistarit nickel-chrome plated a." A r 4 d:gy The transformer type is equipped with a #755 6 vott, vibra. F.. bon resistant bayonet case famo and is available for 120, 240. 380,480 or 600 volt, 50/60 hertz operaton (a #44 1 .1
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'i tamp can be used as an attemate). The transformer wnien, t'. suophes reduced voltage to the lamp is cesigned to pro- ( 1,!k 4 2 j k tect the lamp from burnout by transients and snort dura-j J t on overvoitage. Low neat radiation inereans tne number I that can be mounted in a small space. They are avadable ; TR ANSFO AVE A "rPE FULL v0LTAGE OA PAETEST INotCATING LIGHT PtEsiSToA TYPE PRETEST for one-hole or base mounting and occupy a space j WITH Gi ASS LENS wiTH Pt.AST6C LENS equivalent to one contact block pushbutton deptn. F. ten, See note sin mstasation sad As of tras prtMNct at tettom C4 page 1. ~.. ~
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=. - m-m n = 3. Moderate Flo..w Red-Hat-3 WAY SOLENOID VALVES t I BULLETINS For(oilfree) Instrument Air 206-380 208-448 M ". X"i N " and H " N.P.T. 206 381 208-266 206-832 210-036 General Description Disc - 303 s.5-These ruggec forged brass. steel anc Core Tube - 305 s.s. fj-" stainless steel bocy valves are esce Core and Piugnut - 430F s.s. cially suited for heavy duty incustnal Sonngs -302 s.s and 17 7 PH s.s. acclications. steel valves; Silver for stainless steel s -Q Shacing Coil - Cooper for brass and Imoortant: No minimum operating pressure is recuirec. valves. Apolications Seats - Ethyiene orooylene or303 s s. They are onmanly use: as cilot opera-Gasxets - Ethylene Propylene Coils: Continuous Duty Cass H. tors on ger control vanes in nucieat Temoersture: Fluid: To 180'F. No aluminum parts. Am nt: Nominal Range. 32*F. to These valves aiso may te usec on: Solenoid
Enclosures:
Two types are e air vises e ma nir e tocis availa::le: e compressors e turoines (a) Watertignt (NEM A 4 and 6) Installation: Vatves must be mounted (b) Exclosion P cof anc Watertig ht witn solenoic vertical ana uengnt. Specifications (NEMA 7C. 7D anc 4) Coarse Filter: Integralin valve inlet. nca ancarc Voltages-Optional Features-a Nor. ly ose Ib Normally Coen 24.120. 240. 480 volts. A-C. 60 Hz (or e Junction box enclosure (AC water. (c)) Unive sal St.; H: in 110 voit multicles) tign! solenoic only) Pioe Sizes: 's" %". h" a : :i" N P T 6.12.24.125.250 vo!!s. D-C. (battery
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. Screw terminal cons ( AO watertignt Bocy - Brass Stee: 334 s s-. as Other voltages availacle wnen soiencic only) usteo [ recairec e y, ton elastomers e. "l" 04' W /, j t
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Ch N IX 60C !&O 75 '06 36: 4 2 % 432 6 bois 20 4 i C. IX SC 600 180 75 206 310 7 2% 8327 bass 20 4 i h h 2X IOC 1500 I SO .35 204 2 % i 21bCR I 3w 20 6 i h 4 15r 75 1500 1 80 45 208 2 % 2 216036 2 Se 20 4 h IX 50 1500 180 .75 204 2 % 3 216036 3 Se 20 i g h h IM SC 1500 180 75 204 2 % 4 21sCR4 Sw 20 g H IX SC IMO 1 60 .75 204 2 % $ 214036 5 Sa airst 20 7 9ee DC Construction Ch N 2X 100 600 leo .35 2 % 341 1 km n 7 Cg h 2X 10C 400 180 35 2 % 381 2 boss 53 7 i Cy 75 MO 180 45 2 % 381 3 bass ) 51 2 C4 2X 100 M0 180 3* 2 % 381 4 bass 35 1 7 Ch 4 ISO 75 600 180 45 206 381 5 kns 35 1 7 Ch 60 600 1 90 75 = ' % 341 4 bass Mt 7 Cg I I' 6) WO 180 75 2 % 381 7 bass 35 1 7 4 IX IX IMO 160 35 206 sat 1 Sw 31 1 10 h 15C 75 1500 100 45 208 488 2 See-til to y 12* 6C 1500 1 60 75 20t aas 3 Sw 35 1 10 h lit 6C 1500 ISO 75 206446 4 S ee. nl 30 \\ h 6C 1%0 180 71 208 488 $ S a. avis 25 1 10 { l Li" I heats O f p seres c.osee ape a..enese ca:4 c 4 p.*w 5.rt. I C Wane.m AL 00 teaiawe.s a* Dent 140'I o F e, se,a., onea owanoa.se ca:a.ct *.*w 5.#he O C 8es eat seais #5A. e I a.a-.a n* - N' o<d.ce C. = 25 4
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6GU - E S> - 019 Shen W447g.... TYPICAL OPERATE AND RELEASE TIMES AT NOMINAL COLL VOLTAGE AT +25'C OPERATE TIME RELEASE TIME TYPE IN MILLISECONDS IN MILUSECONDS p V D(, lO SMALL AC NON-LATCH 1NG 5212 5 b 18 gQ /GJ 1/ e SMALL OC NON-LATCHING 15 to 30 5215 SMALL AC LATCHING 6 to 12 N/A
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SMALL DC LATCHING 10 2 16 kA y ,:$h ed leNe.o Y y MEDIUM AC NON-LATCHING 6 b 12 6 b 20 fg/g ( MEDIUM DC #90N-LATCHING 65 to 90 10 b 30 MEDIUM AC LATCHING 8 to 14 N/A i MEDIUM DC LATCHING 30 e 80 N/A t COLL CHARACTERIST1CS OF SMALL NON-LATCHING MOR ROTARY RELAYS SWAM DC C04 NON = UQC#DNG ' SERtES CONTACTS COL YOLTAGE COL CURRENT RES4 STANCE COL power BAEAMDOWN kJ g' / 00 Ma tot AC AMPE RES OHMS WATTS
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CO!L CHARACTARISTICS OF MEDIUM NON-LATCHING MDR ROTARY RELAYS WEDiUW DC Cott mon. LATCMING SE RIE S C0' ACTS Colt YOLTAGE CotL CURRENT REstSTANCE COL POWER BREAKDOWN k, 60 Ha tor AC AWPE RE S OHMS W A TTS' VOLTS RMS MDR1701 16FDT 115 VAC 0 620 84 17.0 1230 MOR170 2 16K.T 440 VAC 0.160 107 17.0 1880 MD A' 721 16 PCT 28VOC 0667 42 18.7 1308 l MDh1731 16PD ' 125 VDC 0.125 1024 16 0 2375 MOR141 1 24 PD - 115 VAC 0 620 84 17.0 1230 i MDR1412 24PDr 4# VAC 0.16C 107 17.0 1880 MDR1671 24PD" 24VOC 0667 42 18 7 1308 MDR1421 g 24PDT 125 VDC 0.125 1024 16 0 2375
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Call CHARACTERISTICS OF SMALL LATCHING MDR ROTARY RELAYS SW ALL LATcMiNG SERRES CONTAL TS COfL YOLTAGE Coll CURRENT REStSTANCE Coll POWER OC Coil BRE AK DOWN VOLTS RMS 64 Ha see AC AWPERES OHMS WATTS MDR67 2 4PDT 115 VAC 0.150 210 5.5 1230 MDR4091 4POS 440 VAC 0 020 4500 30 1880 MDR67 3 4PCs 28VDC 0 308 91 86 1308 )MDRSOSL 4PC T 125 VDC 0104 1200 13 0 2375 (' y( M OR4076 8PD' 115 VAC 0 150 210 55 1230 MDR4092 8PC' 440 VAC 0 020 4500 30 1880 MDR5035 8PDT 28VOC 0308 91 86 1308 MOR5061 8PDT 125 VOC 0.104 1200 13 0 1 2375 Colt CHARACTERISTICS OF MEDIUM LATCHING MDR ROTARY RELAYS IstbiUW DfhG SEntis CONTACTS C04 VOLTAGE C04 CURRENT RE StST ANCE C04 P3WER DC Cott BREAKDOWN VOLTS RMS 60 Ha tot AC AWPERES OHWS W A TTS MDR6064 12PDT 115 VAC 0.380 24 12 0 1230 I MDR6065 12 POT 440 VAC 0 055 540 57 1880 ~ MOR7020 12 POT 28 VOC 0316 89 6 88 1308 MDR7035 12PDT 125 VDC 0 083 1500 104 2375 M DR 66-4 16PDT 115 VAO 0380 24 12 0 1230 MDR6066 16PDT 440 VAC 0 055 540 57 1880 MDR7025 16 POT 28 VDC 0 316 88 6 88 1308 MOA 7036 16PDT 125 VOC 0 083 1500 104 2375 l'er r} e n e ce' W/ Ro o, L s f sy ?"B 2M/6*S~ nc. ea o n o.r,..,, s n.n, _ t w e.
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e v ENCLOSURE 2 Motor-Operated Valves (MOV Margin Discussion)
l' 6 The purpose of this enclosure is to supplement our response on MOV stroke-time margin. The following three valves identified in Table K of calculation SQN-E3-015 have a valve stroke-time margin of greater than 5 percent but less than 10 percent. We have performed an evaluation to determine if these margins are conservative. In all cases, they are conservative because the technical specification limits are nominal numbers and conservatism was already built into the analysis. 1. Valve FCV-67-lil is an essential raw cooling water (ERCW) lower containment ventilation cooler containment isolation valve. Valve FCV-70-89 is a component cooling system (CCS) isciation valve for the reactor coolant pump oil coolers. These valves are in nonessential process lines and receive phase 3 containment isolation signals, indicative of a large break; therefore, these valves are required to prevent a release of radioactivity. However, no radioactivity would be released to the atmosphere unless the following conditions have occurred: A. Fuel damage and fission products relcase to the containment. 3. The ERCW and CCS components inside containment are closed systems that normally have a water head supplied by the pumps. A release path will not exist unless a cooling water line has broken and drained. C. Radioactivity migration into and through the water system. Because it would take at least several minutes for this to occur, a few seconds' delay in the closure of this valve will not cause a release of radioactivity to the atmosphere. 2. Valve FCV-63-25 is a safety injection system (SIS) boron injection tank isolation valve. No specific time limits are established for this valve alone.
- Instead, overall SIS performance response times have been established by the accident analysis for the different design basis accidents.
The increase in valve stroke time for FCV-63-25 has been evaluated, and the overall system response time is still found to be within the analysis assumptions. This valve is one of the early valves to actuate. It also has a faster design stroke time (10 seconds versus 15 seconds) than the limiting valves in the system. The calculated increase in stroke time for FCV-63-25 is less than one second.}}