ML19319B830

Bailey Meter Co 880 Sys Count Rate Channel Noise Testing, 710104-21.

ML19319B830
Person / Time
Site:	Davis Besse
Issue date:	01/21/1971
From:	DIAMOND POWER SPECIALTY CORP. (SUBS. OF BABCOCK &
To:
References
NUDOCS 8001280661
Download: ML19319B830 (48)

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Bailey Meter Company 880 system Count Rate Channel Noise Testing I

with .

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i January 4 thru January 21, 1971 _

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(I TEST RESULTS Basicnaly, three separate tests were conducted on the Source RanSe Channel. All of the tests include the recordings (from Strip Chart type WR Recorder) of the Rate of Chan5e Amplifier output and the combined counts observed on the exterm1 counter

• om the Count Rcte Amplifier Scaler output. The following tests were performed: .

1. Count rate versus Detector high voltage supply.

2. Count rate versus discriminator dial setting.

3 Count rate versus different cabling runs.

Following are the results obtained. .

1. Count Rate versus Detector Hich Voltace Sunuly '

On Tuesday, January 4, 1971, the Source Range Channel was placed'in operation. The BF Detector was installed along 3

- with an alum.inum shield (cnclosing the detector) to the input of the Preamplifier. Approximately 50 feet of triax .

k cable (RG-11) surrounded by an armor shield (SEALTITE) was

\ used for the Preamplifier input. Approximately 125 feet of triax cable (2 cables) were connected between the Preamplifier and Source Range Channel (High Voltage Supply and Preamp 11-fier output), these cable lengths were changed to 250 feet and 225 feet respectively in all subsequent tests. The low l voltage cable was 225 feet of twinax cable Type Rc223/U.

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ff The cabling was coiled up at the Source Range Channel location i

during this test.

l' GRAPHS 1A and 1B depict the output recordings of the Rate of Change Amplifier and the settings of the various amplifier gains, discriminator setting and high voltage supply.

GRAPH 1A - The observed counts were 200 over a 67.5 minute tim e period giving a 4.93 count / loo .

seconds background count rate.

GRAPH 1B - The observed counts were 252 over a 40 minute time period giving a 10.5 count / loo seconds background count rate.

From the detector _ specifications, the background count was given as 11 counts /100 seconds; therefore, the high voltage supply was left at 2100 Volts DC. At this setting, the average output of the Count Rate Amplifier (as measured by the digital voltmeter DVM) was zero volts.

PHOTOGRAPHS 1A, 1B, 1C illustrates the typical curves of the background counts obtained from the detector. Typical pulse heights as measured at the Count Rate input were in the order of frcm .5 to i volt. Several pulses were noted at 1.5 volt amplitudes.

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2. Count Rate versus Discriminator Settings Wednesday evening, January 6, 1971, the cabling (223 feet) between the Preamp 1fier and Count Rate Amplifier was placed alon gside (approximately 225 feet) of the cabling for the stator load (prototyp'e stator for control rod drive mechanism PHOTO from Royal Indus'; ries #12E063-l', ' TYPE A, Revision B) .

2A shows the catling arrangement which was routed outside per C.P.U. instructions. PHOTO 2B depicts the overhead cabling between the DC power supply cabinets (right) and the distri- .

bution cabinets (left). The Inductrol (transformer) is in the foreground. PHOTO 2C illustrates the location of the Preampli-fier in relation to the dummy loads and stator load, Note also, the building ground lead between the Pream'plifier and the cooling water line for the dummy load. The 50 feet of cable between the detector and Preamplifier was coiled up and located below the Preamplifier.

During the test, the dummy loads were not being switched, only the stator load was switched.

The following TABLE lists the conditions and the results of the tests.

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' C.R. Amplifier Gain x2 High Voltage Supply 2100VDC Local DC Power Supply +15.ooVDC & -15 00VDC Background Pulse Height .5 to 1.5V (measured C.R. Input) at Discriminator poise Setting Local Indication Spikes Dial R of C Ampl.

Reading (Bursts)

C.R. Ampi. Observed C.R. Input Output Output Counts Dec./Xin.

0 0 --- o @ 9:04 Normal 1.0 '

Electronic 87 @ 9: 19 Noise Observed noise 3 5ms period C IV

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FIGURE 2A illustrates the count rate in counts / min. versus the discriminator setting. With c discriminator setting of

.08, the electronic counter was picking up the electronic noise of the channel; therefore, the lowest reading was set at 0.1. The graph is typical of the type of response normal-ly obtained due to the randcm pulse height from the detector.

GRAPH 2A illustrates the Rate of Change Amplifier response for various discriminator settings. The recording started at 9:04. The recording is similar to those obtained in GRAPHS 1A and 1B which were run while the Rod Drive System was OFF.

The various labeled points (in GRAPH 2A) beginning af ter 10:12 are discuss,ed below.

STEP 1 At approximately 10:13, the High Voltage Detector Power Supply was turned 0FF. This action caused the output of the Rate of Change Amplifier to increase I and trip the Bistable whose set point was + 2 t

decades / min. (2.727 Volts). The-discriminator was

set at 5 0. The high voltage supply was removed so

'. that a signal source could be inserted in place of the l

detector to prove the operability of the Preamplifier.

Also, the Preamplifier gain was reduced to X2 to pre-vent the output from saturating from the fixed signal source. The high voltage supply w1s kept in the OFF l

state to prevent darc. age to the signal source.

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' The s$gnal source was turned ON at 77.8 KHz rate. The

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output of the Rate of Change Amplifier went full scale (due to a step change cf input frequency) and then settled to a rate of 0 decades /hin. prior to time (3).

STEP 3 The test source was switched to 400 Hert rate (436 measured). The initial positive spike is due to the inherent switch characteristics of the simulated source.

i With the switch between the two frequency divisions, the oscillator oscillates at a high frequency.

7 STEP 4 With the simulated source at appro::imately 400 Hertz, 1

a negative rate occurs (initially at 77.8K Hertz) and recovers to a steady state value b'etween STEPS 4 and

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i STEP 6 Simulated source was switched to a 1 Hertz rate from the 400 Hertz rate. This negative rate causes the Rate of Change Amplifier to go negative and recover to O Dec./141n. (.9 volts) in the required settling time.

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Channel was shut down for the evening.

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PHOTOGRAPHS 2D, 2E, 2F, illustrates some typical noise signals measured with the oscilloscope at the Count Rate Amplifier input. PHOTO 2D is with the Rod Drive S stem OFF and shows normal noise at about 80 mv peak to peak. .

PHOTOGRAPHS 2E and 2F illustrates typical noise levels with the Rod Drive System in the run mode. The trace shows no apparent increase in noise level.

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Thursday morning, January 7, 1971, the cabling between the Preamplifier and Count Rate Amplifier was brought into the building and rerouted. PHOTOGRAPH 3A and FIGURE 3A i illustrates the cabling run used in the subsequent tests.

The cabling between the detector. and Preamplifier was At initially coiled up and placed below the Preamp 11rier.

several points in time, this cable was moved to determine ,

the effects of various cabling runs.

During the tests, the status of the Rod Drive System was monitored (TABLE 3A) along with the observed counts and the Count Rate output (DVM). .

GRAPH 3A is the plot of the Rate of Change Amplifier's output voltage versus time. Initially, the discriminator was set for 5 0. At 10:29 the discriminator setting was reduced'to 1.0 giving a reference curve with the Rod Drive System shut down. The testing began at 11:26 and proceeded until 12:32. The Rod Drive System was then shut down and l the Source Range Channel was left ON.

k i

k FIGURE 3B is a plot of the observed counts versus time during t

the testing program. The average count rate is apprcximately 5

5.66 counts / min. which resembles the observed count rate in The count rate shows a slight FIGURE 2A and GRAPH 1B.

In this period, the increase between the 12:00 and 12:17.

I* detector cable was alongside (34 feet) of the power supply cable.

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PHOTO 3B is a view of the Preamp 11rier from the Rod Drive System console; also, the overhead cabling is shown for con- .

nections to the dummy loads in the corner of the building.

PHOTO 30 is a view of the Inductrols (transformers) which supply AC power to the DC power supplies.

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Discriminator set at 1.0 Breamplifier - X10 C R. Amp 1. X2 3 H.V. Supply - 2100 Volts DC j

REMARKS

. TIME COUUTS CR OUTPUT (Volts) 0 .04 Start test 11:26 Turn on DC Supply 11:28 8 -- -

+ .03 - Tripped DC Breakers (no Load) 11:32 31

' ~

11: 34 51 + .117 ,

Recct Breakers Switching Rods (Run Mode)

~

11: 37 65 .166 -

(Average load 15 Amps)

(17 Amps Load Current Steady State) Jog Mode (Stator + 11 Dummy Loads) 75 .153 - Back to Run Mode 11: 39 11:44 94 .042 - Moved Detector Cable parallel to Stator ~ 30 feet

+ .027 - No noticeable change in 11: 50 130 noise level 11: 56 164 + .099 -

No noticeable change in 12:00 187 .055 noise level 12:07 239 + .415 - Cable was noved. Detector alongside (34 feet) of Power Supply Cabl.c 12:10 261 .026 -

+ .042 No change 12:14 283 -

+ .119 No change 12:17 308 -

.022 No change 12:20 319 .

12:22 324 .013 - Moved De ector Cable between Cabinetse Detector near Trc.nsformer

' No change 12:25 334 .150 -

80 rce noise spikes due SCR firing 12:28 346 .236 -. No change

.- Shut down Rod Drive System 12:32 366 .155 t J

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! 4.

Friday morning, January 8, 1971, using the cabling

> run shown in PHOTOGRAPH 3A and FIGURE 3A with the detector cable laying next to the output busses, the outputs from The Source Range the Source Range Channel were monitored.

Channel tests were conducted while Diamond Power Company was performing the composite tests on the Rod Drive System.

GRAPH 4A is a plot of the Rate of Change /iplifier's output voltage versus time. The discriminator setting was 1.0 during the next series of tests. The preamp 11fier gain was 10, the Count Rate Amplifier's Pulse Amplifier gain was 2 and the Bistable Rod Hold point was 2.727 Volts which is a 2 decades / min. indication from the Ra'te of Change Ampli-fier. These settings were not changed until noted.

The composite test of the Rod Drive System was at section 6.22 and ran through section 6.23 on Friday. During the entire day no rod hold ii.dication appeared on the Bistable module. FIGURE 4D and 4E are plots of the observed counts versus time for GRAPH 4A.

GRAPH 4B is a plot of the Rate of Change Amplifier's output voltage versus time for Saturday morning, January 9, 1971.

During this time several trips and startups of the Rod Drive system were performed;at no time did any rod hold indication appear on the B1 stable module.

I e

GRAPH 40 is a plot of the Rate of, Change Amplifier's output voltage versus time for Monday afternoon, January 11, 1971.

During the time indicated on GRAPH 40 no rod hold indication appeared on the Bistable module.

GRAPH 4D is a plot of the Rate of Change Amplifier's output voltage versus time for Tuesday, January 19, 1971. At 2: 50 P.M., the' cabling arrangement was changed.to that shown in FIGURE 4A. The detector cable was moved from the floor and located in the cable tray along with the cables going to the loads'in the rod drive system. The cables going from the Preamplifier to the rest of the Source Range Channel were placed alongside of the stator cables located outside.

Rod hold indication appeared on the Bistable module's output only when the Rod Drive System was comp 1'etely tripped including all AC and DC power to the Rod Drive System or when all AC and DC power was turned on from this completely tripped condition. No rod hold information was indicated when the rods were being inserted or withdrawn.

GRAPH 4E is a plot of the Rate of Change Amplifier's output voltage versus time for Wednesday, January 20, 1971. The conditions for this plot were the same as that for GRAPH 4D.

The rod hold indication appeared on the Bistable module only when the Rod Drive System was completely tripped including all AC and DC power or when all AC and DC power was turned on from this completely tripped condition. No rod hold infonmation was indicated when the rods were being inserted i or withdrawn.

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. I Tabics 4-1 through 4-5 give information on time, counts, count rate output, and comments on status of Rod Drive l' System for GRAPHS 4A through 4E respectively.

FIGURE 4B illustrates the count rate in counts / min. versus the discriminator setting. The figure is composed of several plots made under different conditions. The first plot, whose points are indicated by a "O" was made with the Rod Drive System ON but with all loads disconnected. The -

data for these points is given in table 4-6. The second plot, whose points are indicated by an "X", is FIGURE 2A replotted. The third plot, whose poin'ts are indicated by a "/h", was made under conditions shown in FIGURE 4A with all loads and the stator connected and ru5ning. The data for these points is given in table 4-7. The preamplifier gain for all plot's in FIGURE 4B was X10.

FIGURE 40 illustrates the count rate in counts / min. versus

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', a "fi", was made under conditions shown in FIGURE hA with all loads and stator connected and running. The data for these points is given in table 4-9 s

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TABLE 4-1 Events vs Time for Graph 4A DATE: 1-8-71 Discriminator s,et at 1.0 Preamplifier -X10 C.R. Ampl. -X2 H.V. Supply -2100 Volts DC C.R. OUTPUT (Volts) REMARKS TIME COU1TTS 0 --

Detector by output busses 9:32AM (arc welding cable) 9:51AM 100 --

10:26AM 284 --

Section 6.22 is being run in 10:46AM 363 the composite test for the.

Rod Drive System.

-- Trip out breakers.

11:07AM ---

Several breaker trips.

11:12AM 606 +.1V .

11:12 HAM 646 +.131V 11:14AM 655 11:24AM 716 --

Breaker trip.

11:24 HAM 719 --

11:30AM 749 12:27PM 1008 --

Breaker trip.

12:36PM ---

12:51PM 1133 --

Several trips.

1:06PM 1196 .137V 1: 30PM 1322 -- Total Rod Drive shut-down.

1:40PM --- -- Paragraph 6.22.3 in composite Test.

1:46PM 1387 -- Paragraph 6.22.4 in Composite -

- Test.

1:53PM 1434 .147V Power to Rod Drive System turned 2:14PM ---

off.

1706 -- Main power turned on.

2:44PM Several breaker trips.

3:00PM 2016 --

2110 .1887 Paragraph 6.23 2 in Composite 3:26PM Test.

2182 .200V Shut-down Test.

3: 38PM. Start-Up Test.

8:30PM 0 --

9:05PM 190 .1867 9:47PM 412 --

10:57PM 877 .105V l

l

TABLE 4-2 Events vs Time for Graph 4B DATE: 1-9-71 s

Prcamplifier -X10 C.R. Amp 1. -X2 i Discriminator set at 1.0 H.V. Supply -2100 Volts DC i .

ed COUNTS REMARKS TIME 10:15AM O 23 Rod Drive System power orr.

10:22AM Rod Drive System power on.

, 10:38AM DC power on.

11:OOAM 341 Source range channel shut-orr.

11:50AM 9

1 t

i o

"t i

l i

5

TABLE 4-3

~

' Events vs Time for Graph 4C ' DATE: 1-11-71

(

C.R. Amp 1. -X2

' l Discriminator s'et at 1.0 Preamplifier -X10 H.V. Supply -2100 Volts DC l .

TIME COUNTS C.R. OUTPUT (Volts) REMARKS O +.054V Turn on Source Range Channel 2:13PM 2:15PM 21 --

2:38PM 150 +.024V

' 3:02PM 270 .076V 3:26PM 405 .060V 4:14PM --- -- AC&DC power turned on + off to Rod Drive 4:24PM 1170 .076V .

4:37PM 1236 --

4:46PM 1268 --

e e

O O

4 e

l l

TABLE 4- -A Events vs Time for Graph AD DATE: 1-19-71 Discriminator set at 1.0 Preampfirier -X10 C.R. Amp 1. -X2 H.V. Supply -2100 Volts DC 9

C.R. OUTPUT (Volts) REMARKS TIME COUNTS O -- Rod Drive System shut-off.

8:57AM Rod Drive System shut-off.

, 9:08AM 56 . - -

9: 17AM 104 -- Stop Chart 2:OOPM O -- Loads on, Rod Drive on, react 19 counter moving cables on 2:05PM --

source range stopped moving 2:12PM 51

• cables.

2:20PM 111 -- Reset Rod Drive trip.

187 Rod Drive power off, e 2:32PM --

Shut-off source range to 2:46PM 288 --

relocate detector cable in wiring tray with Rod Drive System load wires.

3:05PM O -- Turned Source Range on, reset

- counter.

3: 11PM --- -- Rod Drive trip reset.

3: 14PM 284 --

406 .082V Transfer supply in Rod Drive 3: 24PM System.'

3:37PM 501 .055V 4: 20PM 4423 -- Rod Drive trip reset, rod hold generated.

Turn off Rod Drive System 4:52PM --- --

move detector cable in cable tray O -- Turn on Rod Drive System, 5:lOPM reset counter.

5:32PM 2512 .013V 5:38PM 2606 -- Trip Rod Drive System 5: 41PM 3167 --

5470 +.2507 Rec (- Rod Drive trip, rod 5:44PM hold generated.

5867 +.120V Rod Drive System tripped.

5:51PM 6:03PM 5938 -- Turn off test.

l l

l l .

l l

l 8

TAELE h-4-r Events vs Time for Graph 4D DATE: 1-19-71

( Continuation of TABLE 4-4-A TIME ColmTS C.R. OUTPUT (Volts) IS4 ARKS j,

8:10PM 0 .22V Restart test.

8: 16PM 30 --

8: 17PM --- -- Transfer power supplies on Rod Drive System.

8: 18PM. 199 --

8:26PM 235 -- -

8:28PM --- -- Rod Drive trip.

8:30PM 484 --

8:38PM 1837 +.140V Reset Rod Drive trip, generated Rod hold on Source Range Channel, 8:55PM 1920 .243V 8:57PM 2663 -- Rod Drive trip.

9:25PM 4088 -- Reset Rod Drive trip.

9:25PM 0 -- Reset counter.

9:30}PM 975 --

9:34PM 1596 -- Rod Drive trip.

9:37PM 1699 -- Transfer power supplies on Rod Drive System.

9:45PM 1772 -- Transfer power supplies on Rod Drive System.

9:49PM 1904 --

9:51PM 1916 --

9:54PM 2096 --

9:54hPM 3547 -- Rod Drive trip and reset.

10:18PM 3874 --

i i

k i

5 *

-N t

e

I TABLE h-5 Events vs Time for Graph 4E DATE: 1-20-71 Discriminator set at 1.0 Preamplifier -X10 C.R. Amp 1. -X2

. H.V. Supply -2100 Volts DC TIME COUNTS C.R. OUTPUT (Volts) REMARKS 8:27AM o --

8: 28AM --- -- Rod Drive System trip and reset.

8:30AM 1465 -- .

8:31AM 1633 --

8:35AM 2426 -- Rod Drive System trip.

8:38AM 2442 --

8:41AM 3681 -- Rod Drive System reset.-

8:46AM 4038 --

7:04AM 4975 -- -

9: 13AM 5001 --

, 9:29AM 5092 --

. 9:44AM 5173 --

10:17AM 5436 .080V 10:42AM 5538 .205V 10:53AM 5583 --

11:00AM --- -- Rod Drive System trip and reset.

11: 39AM 10660 e

J 9

e i

TABLE 4-0 1 Discriminator Setting vs Obnerved Counts l* H16h Voltage Supply 2100VDC Rod Drive System OU Loads OFF Preamplifier Gain X10 Local DO Fo'.:er Supply +15.0VD0 j C.R. Amplifier Gain X2 & -15 0VD0 Points are indicated on FIGURE 4B by 0 DISCRIMINATOR DIAL SETTING ELAPSED TIME OBSERVED COUNTS 3 0.00 1 Min. 1439098 0.02 1 Min. 1351932 0.04 1 Min. 320043 0.06 1 Min. 72082 0.08 1 Min. 1404 0.10 1 Min. 302 0.12 4 Min. 195 0.14 5 Min. 66 -

0.16 5 Min. 70 0.18 5 Min. 68 0.20 5 Min. 49 0.30 4 Min. 40 0.40 5 Min. 50 0.50 6 Min. 46 0.60 5 Min. 30 -

0.70 5 Min. 30 0.80 10 Min. 54 0.90 10 Min. . 70 1.00 10 Min. 62 1.50 10 Min. 44 2.00 10 Min. 34 2.50 10 Min. 24 11 Min.

3.00 19 3.50 15 Min. 20 4.00 10 Min. 18 4.50 10 Min. 6

' 5 00 12 Min. 10 5.50 24 Min. 11 6.00 41 Min. 11 6.50 92 Min. 24 3 O 7.00 33 Min.

i i

t -

?.

?

l l \

s r TABLE 4-7 Discriminator Setting vs observed Counts Rod Drive System ON All Loads ON

( ~. Preemplifier Gain X10 High Voltage Supply 21ooVDC C.R. /.mplifier Gain X2 Local DC Power Supply +15.oVDC & -15.ovDC Points are indicated on FIGURE 4B by /1 ELAPSED TIME _ OBSERVED COUNTS D_ISCRIMINATOR DIAL SETTING 1 Min. 548728 0.00 446955 0.02 1 Min 1 Min. 181212 0.04 35281 0.06 1 Min.

1 Min. 1504 0.08 981 0.10 1 Min.

1 Min. 878 0.12 745 0.14 1 Min.

1 Min. 528 .

0.16 498 o.18 1 Min.

1 Min. 381 0.20 218 0.30 1 Min.

1 Min. 101 0.40 77 0.50 1 Min.

2 Min. 70 0.60 0.70 4 Min. lol 5 Min. 43 o.80 106 0.90 8 Min. ~

4 Min. 29 1.00 19 1.50 4 Min.

22 2.00 5 Min.

?

I, I

?

i t

'.. r m amc,-@-o Discriminator Setting vs obnerved Counta i

' Rod Drive System ON All Loads ON

._- Preamplifier Gain X20 High Voltage Supply 21ooVDC

C.R. Amplifier Gain X2 Local DC Power Supply +15.oVDC & -15.oVDC Points are indicated on FIGURE 40 by o i

DISCRIMINATOR DIAL SETTING ELAPSED TIME OBSERVED COUNTS

o.00 1 Min. 14601650 0.02 '

1 Min. 14579251 0.04 1 Min. 9308453 0.06 1 Min. 5153192 0.08 1 Min. 3005932 0.10 1 Mio. 1456162 .

o.12 -

1 Min. 640767 0.24 1 Min. 311649 O.16 1 Min. 133632 O.18 1 Min. 51001 o.20 1 Min. 22556 0.30 1 Min. 89 0.40 3 Min. 29

, 0.50 2 Min. 15 0.60 1 Min. 9 1.00 4 Min. 23 f

o n e

~

. 1

~

TABLE 4-9 Discriminator SettinS vs Observed Counts' Rod Drive System ON All Loads QU Prcamplifier Gain X20 High Voltage Supply 2100VDC C.R. Amplifier Gain X2 Local DC Power Supply +15.0VDC & -15.0VDC Points are indicated on FIGURE 4C by 21 DISCRIMINATOR DIAL SETPING ELAPSED TIME _0BSERVED COUNTS 0.06 1 Min. 12527660 0.08 .

1 Min. 6844186 0.10 1 Min.

0.12 3242279

-- 1 Min. 1839735 0.14 1 Min.

0.16 872700 1 Min 452377 -

0.18 ' 1 Min.

0.20 218593 0,30 1 Min. 80236 -

1 Min. 3957 0.40 1 Min.

0.50 1740 1 Min. 986 0.60 1 Min.

0.70 567 1 Min. 389 0.80 1 Min.

0 90 301 1 Min. 156 1.00 2 Min. 262 1.50 2 Min. 81 2.00 4 Min. -

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