ML20053E521
| ML20053E521 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 05/20/1982 |
| From: | Nix H, Rogers W GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20053E517 | List: |
| References | |
| HNP-8142-01, HNP-8142-1, NUDOCS 8206080481 | |
| Download: ML20053E521 (17) | |
Text
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-- GEORGI A POWER COMPANY .
3 f HATCH NUCLEAR PLANT 1 PROCEDURE a
. Stabilized Assay Meter, SAM-2 PROCEDURE TITLE ,
. HNP-8142 PROCEDURE NUMBER Lab RESPONSIBLE SECTION SAFETY RELATED ( X ) -
NON-SAFETY RELATED ( ) APPROVED APPROVED REV. DESCRIPTION DEPT. PLANT DATE HEAD MANAGER
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CB9CEDUBE_BW1010N BEGUESI PROCEDURE NO. HNP _ _ Revision No. _ 7 .-
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E. L HATCH NUCLEAR PLANT HNP-8142 T Ntvi4KJee f.o See Title Page U.IL 2 cn0 ', See Title Page GeorgiaPower d ~~ 1 of 15 STABILIZED ASSAY METER, 5 AM .' OPERATIONANDCALIBRATkON A. PURPOSE . To establish a standard technique for the operation and calibration of the Eberline Stabilized Assay Meter, Model SAM-2; and provide a method of operation to determine I-131 concentrations in samples. B '. SAFETY i J
- 1. Observe safety rules outlined ~1n Georgia Power Company SAFETY, Section "O."
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- 2. Observe radiation protection procedures when calibrating the
;- instrument with radioactive sources.
- f. ,
., C. REFERENCES
- 1. Stabilized Assay Meter Model SAM-2 Technical Manual.
- 2. Eberline Instrument Checkout Procedures. l
- 0. TEST EQUIPMENT
- l. Electrostatic Voltmeter
- 2. 100 meg ohm load .
- 3. Mini-pulser, Model MP-1
- 4. Calibrated Ba'-133 source
- E. DEstkIPTION OF INSTRUMENT
- 1. The SAM-2/RD-22 combination provides a portable gam spectrometer that has-been set up to be used in e $ des for analysis of low volume air samples for I-l i .
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k(3 6NIt provides dual channel analyzer with sca V r readout of either channel or scaler readout or
. difference of the two channels.
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- 2. Stabilization is obtained from Am' .. doping in the RD-22 detector scintillation crystal, which yields pulses that are counted and used to control the high voltage' applied to the detector. This maintains a constant gain throughout the entire system.
- 3. A rear panel switch disables the stabilization circuit so ,
the instrument can be used as a conventional scaler-ratemeter-analyzer with other types of detectors. 1
- 4. The instrument may be. powered either from A.C. line or an I external battery pack.' -f
;9 F. DESCRIPTION OF CONTROLS AND CONNECTORS
- 1. External Controls
- a. DETECTOR: Connection to detector; MHV series coaxial. [
- b. H.V. ADJUST: Ten t' urn calibrated dialefor setting and f chadsing high voltage when operating in unstabilized l
)~ - mode. Functions as a high voltage limit control when 4[
in the stabilized mode. I
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'.5 c. THRESHOLD: Ten turn calibrated dials for setting and changing baseline sensitivity for each channel. j
- d. WINDOW: Ten turn calibrated dials for setting and changing range of pulse heights to be counted for each channel.
- e. IN-C JT: Switches to select gross counting (OUT) or PHA (IN) for each channel.
- f. +, OFF, -: Switches to select additive, subtractive or non-counting mode.for each channel.
- g. TIMED-STOP-MAN: Switch to select counting mode.
- h. RESET-START: Switch to reset all appropriate circuitry
'to zero and start a counting sequence,
- i. COUNT TIME IN MINUTES: Switches to selectdesirep.f counting time. ( 44
- j. RANGE SWITCH: Selects range of r' ate met ,
5000, 50,000, or 500,000 counts per mi ) % O S 3 n1anual set __ae _: -.
muctuva No )
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- k. CHl, CH2: Switch to select whic,h chann'el is displayed on rate meter. ,
- 1. RESET: Returns meter reading rapidly to zero when depressed.
m ., RESPONSE: Controls response' time of the meter.
- n. POWER: Switch to supply power to instrument (rear panel).
- o. BATTERY: Connector for plugging in. external battery (rear panel). .
- p. STABILIZER: Switch selects stabilized or unstabilized operation (rear panel).
- q. DISPLAY ON-OFF: Switch disables digital display to conserve battery. ,
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.- r. 115-230: Switch sel2 cts 115 or 230 VAC operation (underneath chassis). R
.- s. AMP OUT: BNC connector which provides an output for connection to a multichannel analyzer.
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- 2. Internal Controls
- a. GAIN (Channel 1 Amplifier Board): Control for adjusting gain of amplifier. .
- b. TIME (Timer Board): Control to calibrate time base when operating with external battery.
- c. RATE METER CALIBRATION (Rate Meter Board): Controls to calibrate meter reading.
- d. SENSITIVITY (Stabilizer Board): Controls stabilizer j setpoint. 1 G. OPERATION OF INSTRUMENT
(
- l. Verify that the RD-22 detector is properly connected to SAM-2 detector connector. . Y'
- 2. Connect SAM-2/RD-22 to p?wer supply and turn P 'dwit't c (rear panel). .
4V 3.. Operate STABILIZER switch to ON'(rear panel) and set , switches to "IN" and "+." manual set . 2 ... -
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- 4. Set CH1 THRESHOLD and H.V. ADJUST'to, settings determined from last calibration. See label on top of instrument.
- 5. Set CH1 WINDOW to ".72" G. Turn CH2 THRESHOLD to "4.0" and place CH2 WINDOW to setting determined on Data Package 3 (Data Sheet 3).
- 7. Place CH2 switches to "IN" and " " for back'round g subtraction. (
- 8. Set Display ON-DFF switch to "ON". r
- 9. Set desired count time and TIME-STOP-MAN. switch to TIME.
. 10. Place the sample, enclosed in plastic, in the proper geometry to the detector and press the RESET-START switch.
Note the shelf number on Data Package 1 (Data Sheet 1). .
- 11. When counting is comple'te, the value in the display is "not" counts fer the Iodine activity. e
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NOTE If negative counts are obtained when counting a sample, [
- CH2 switches must be set to "OUT" and "OFF" causing [
gross counts to be observed in the display. Recount U sample and then substract background found on Data ! Package 3'(Data Sheet 3) manually to obtain net counts. ( 9
- 12. Using Data Package 1 (Data Sheet 1), calculate the Iodine concentration of the counted sample using the following
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formulas-4
- a. Silver Zeolite Cartridges; i
. (NET CPM) (4.5 x E-10) J Iodine Activity (uci/cc) =,(Volume in Liters)(.95)(D.E.) j
- b. Charcoal. Cartridges * , f s i
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( NET CPM) (4.5 x E-10) Iodine Activity (uci/cc) = Volume in Liters)(.99 YC" l. 1 A NOTE
- 1. 4.5 x 10 10 = conversion factor to get from disintegrations per minute to microcuries.
- 2. .95 = filter media collection efficiency for silver ,
zeolite cartridges. j nianual set 2 -. . -
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- 3. .99 = filter media collect' ion ef.ficiency for charcoal l j cartridges .
- 4. Volume in liters of sample = sampling time (min) x flow 4 rate of air sample (LPM) q
- t 5.. D.E. = detector ef ficiency at specific shelf height
- 6. Net CPM = Net counts per minute of sample; net counts i divided by count time. 1
- 13. Operational calibration must be performed DAILY when instrument is in use, see Section I.
H. CALIBRATION CAUTION f; High voltage exists in certain internal componenets, so extreme i 4
- care should be"used when instrument is removed from its case.
- 1. High Voltage Adjustment
'C a. Plug instrument into A.C. line and connect a 100 meg l ohm load to the DETECTOR connector. j
- b. Connect a 3KV electrostatic voltmeter to pin A of the High Voltage Power Supply making certain the Hign 2 Voltage Power Supply is plugged into its socket.
- c. Operate POWER and STABILIZER switches to ON (rear {r panel) and check the high voltage output versus the high voltage settings as indicated oelow:
( HV ADJUST . HIGH VOLTAGE { 5.0 .900 - 1100 volts 10.0 1400 volts or more Record MPL number of electrostatic voltmeter used on
' Data Package 2 (Data Sheet 2) . -
d. Set 1500the HV ADJUST volts. Record control to limit this setting on the Datahigh voltage,j,at*, Packagg Q y n (Data Sheet 2) and place a label on instrumep bearint this HV ADJUST setting. (*$ g .
- 2. Calibration of' Count Rate Meter
~
- a. Connect an MP-1, Mini Pulser to the DETECTOR n n e c.t o r ,
- setting a pulse height of approximately 300 mv and a frequency of 400 CPM. Record serial number of MP-1 on Data Package 2 (Data Sheet 2).
manual set 1 a _ __ _ _ _ _x
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- b. Place CH1 switches to "+" and "IN", CH2 switches to "OUT" and "0FF".
- c. With the range switch on X1, adjust the X1 calibration -
potentiometer on the rate meter board for a reading of 400 CPM on the meter. s d .' Repeat with 4000, 40,000, and 400,000 CPM on the X10, i X100, and X1000 ranges respectively. Record results on Data Package 2 (Data Sheet 2).
- e. Check linearity at-100, 1000, 10,000, and 100,000 CPM '
cn the respective ranges. Do not record results, but if linearity is not 1 10% repeat steps 2a - 2c.
- 3. Adjustment of Linear Gain ,
- a. Set the CH1 THRESHOLD control to 3.64 and CH1 WINDOW control to 0.1 ,
i .3~ w- b. Place CH2 switch to "0FF." 1
- c. Operate the CH1 WINDOW switches to "IN" and "+" and
- place a Ba-133 source in proper geometry to the detector end face.
.. )
- d. Adjust the GAIN control on the CH1 amplifier - PHA j board until the maximum count rate is obtained. Take g several 0.1 minute counts to confirm that the 364 kevIf peak lies between 3.59 and 3.69 THRESHOLD setting.
there is insufficient gain to place the peak at 3.64, - adjust the stabilizer SENSITIVITY control CW until the peak is below 3.64, then adjust the GAIN control CW until the peak is approximately 3.64. ,
- 4. Threshold Determination .
- a. Set CHl. THRESHOLD to 2.5 and CH1 WINDOW to 0.1
- b. Set CH2 switch to 0FF .
- c. Place a Ba-133 source in proper geometry to the detector and face. q
- d. Set count time to 1.0 and. TIMED-STOP-MAN swJ TIMED. T.5t {
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- e. Do a series of counts advancing the THRESHOLD by increments of 0.1, up to a THRESHOLD of 4.0. Record ,
results on Data Package 2 (Data Sheet 2) and plot data I graphically on Data Package 2 (Data Sheet Ea). Plot the threshold settings on the X, axis and counts per minute (CPM) on the Y-axis.
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a 1
- f. Determine the peak THRESHOLD setting from this curve ]
and then using .a WINDOW setting of 0.72, calculate the , optimum THRESHOLD setting by subtracting one half of i the WINDOW setting from the peak THRESHOLD setting. i
, l
- g. Place a label showing the optimum THRESHOLD setting and the WINDOW setting of 0.72 on top of the instrument for later reference. Record the optimum THRESHOLD setting ,
on Data Package 2 (Data Sheet 2). I l S. Detector Resolution Determination
- a. Detector resolution can also be determined by using the l curve drawn from the data in step 4e. ,
s.a a b. Determine the peak THRESHOLD setting from this curve l
/ " and record on Data Package 2 (Data Sheet 2). -- c. Determine the THRESHOLD setting at one half the peak l count at a THRESHOLD setting greater than 3.69 and j, record on Data Package 2 (Data Sheet 2). lj
\ b
- d. Figure the detector resolution as follows. l
% RES = 2(High settinf L or 1/2_ peak - geak setting) yjg .,
Peak Setting il lf
- e. The resolution should be 1S% or less. Record on Data h Package 2 (Data Sheet 2). ,j l
I. DAILY OPERATIONAL. CALIBRATION - l1
- 1. Verify that the RD-22 detector is properly. connected to the 1li SAM-2 DETECTOR connector. ,
f
- 2. Connect SAM-2/RD-22 to power supply and turn POWER swit h ON (rear panel). ;
l
- 3. Operate STABILIZER switch to ON (rear panel)' ' c.n d f switches to "IN" and "t." i l
Set CH1 THRESHOLD and HV ADJUST to setting om 4. last ca l ib ra t i,on. See label on t'op of in n) yte$ ( S. Place CH1 WINDOW to ".72". - l.
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. t Set CH1 switches to "IN" and "+", and CH2 switches to "OUT" :
6. and "0FF". ,' l
- < lI:
- 7. Set Display ON-OFF switch to "0N".
- 8. Set count time to 1.0 minute and TIMED-STOP-MAN switch to ~l TIMED. ,
I l
- 9. Record a 1.0 minute count of CH1 background at these ll settings on Data Package 3 (Data Sheet 3). li l.
- 10. Set CH1 switches to "OUT" and "0FF", and place the CH2 switches to "IN" and "+."
1
- 11. Place the CH2 THRESHOLD TO 4.0 and adjust the CH2 window until it equals.the background count found in CH1 (The difference between CH1 & CH2 should not exceed 5% if l l possible.) Record the CH2 window setting on Data Package 3 l i
(Data Sheet 3). . t" Set CH1 switches to "IN" and "+" and CH2 switches to "IN" 1 12. and " " _
,, 13. Place a Ba-133 source in proper geometry to the detector on Shelf # 3 and count for 5 minutes. Counts observed in the ,
1 display window represents the NET counts of the source with the background subtracted. Record in counts per minute on Data Package 3 (Data Sheet 3). NOTE l If negative counts are obtained when counting a sample, CH2 switches must be set to "OUT" and "0FF" causing gross counts to be observed in the display. Recount ; sample and then su stract background found on Data e Package 3 (Data Sheet 3) manually to obtain net counts.
, [
- 14. Divide the NET counts per minute of the sQurce by the known f' disintegrations per minute of the source and multiply by l.19 to get the efficiency of the detector (0.E.).
NOTE 6M The 1.19 factor accounts for the difference in yiel. kg itfle ,
#N Ba-133 and the I-131 gammas. ) -
- 15. Repeat steps 11 and 12 with shelves 4 and N
'til
*M4 i detector efficiency for each of the three v i
. 16. Complete Data Package 3 (Data Sheet 3) on a daily is,
' only when SAM- 2/RD-22 is in use, manual set N .
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