ML19224B195
| ML19224B195 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/07/1976 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1710, TM-0117, TM-117, NUDOCS 7906140198 | |
| Download: ML19224B195 (6) | |
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TMI DOCUMENTS
- h DOCUMENT NO:
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i METROPOLITAN EDISON COMPANY.
Wilda R. Mullinix, NRC 7 9 0 614 017F
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192 071
MhST$R CDFf 7'o Revision 2 DO NOT REMOVE o9/o7/7'
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THREE MILE ISLAND NUCLEAR STATION
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CONTROLLED COPY STATION HEALTH PHYSICS PROCEDURE 1710 BACKGROUf1D DETERMINATI0ft FOR PACKARD TRI-CARB
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Table of Effective Pages Pace Cote R evision Paae Date Revision Pace Date R evision 1.0 09/07/76 2
26.0 51.0 2.0 09/07/76 2
27.0 52.0 3.0 09/07/76 2
28.0 53.0 4.0 09/07/76 2
29.0 54.0 5.0 09/07/76 2
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Date Date Chairrrkn f PO 3C Chairna of PO 3C
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Unit Superintendent
- HPP 1710 Revision 2 09/07/76 THREE MILE ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURE #1710 Background Determination for Packard TRI - CARB l.0 PURPOSE The purpose of this procedure is to list the steps necessary to determine the background count rate on the Liquid Scintillation Counter.
2.0 DISCUSSION 2.1 Backgrounc determinations must be made on all radiation detectors if actual sample activity is to be expressed in curies or a sub-mul tiple.
Various phenomena contribute to background counts rate.
Normally blank sample (s) will be counted with a sample group to determine background count rate for the group. However, a back-ground count rate may be determined at any time.
2.2 Caution
DO NOT stop the machine unless a count is in progress.
2.3 New counting blanks should be prepared with each new sample type or at least weekly.
3.0 REFERENCES
3.1 Instruction Manual #2080 for Packard Model 3320 Liquid Scintilla-tion Spectrometer System.
3.2 PCP 1803.
3.3 Instagel instructions.
4.0 EQUIPMENT 4.1 Packard Model 3320 Liquid Scintillation Spectrometer.
4.2 Scintillation counting vials.
2 4.3 Scintillation counting solution.
4.4 Pipets.
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192 073 -
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. ~ 'HPP 1710 Revision 2 09/07/76
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5.0 OPERATING INSTRUCTIONS 5.1 Insure instrument controls are set as follows:
Control Position a.
Mode selector Preser.t Auto b.
Preset Time 10 (or as desired) c.
Minutes-Seconds Minutes d.
Preset Count 900,000 e.
Display Channel 1 f.
Window A-B g.
Lower Discrim. (A) 50 Units h.
Upper Discrim. (8)
As described in 5.5.2 of HPP 1741 i.
Sample Changer Stop J.
Gain See HPP 1741 5.2 Obtain or prepare blank background sample (s) of similar counting solution and liquid volumes to the samples to be counted.
(Suggested volume ratios in Sec. 6).
5.3 Place the background sample (s) in the changer.
Place a " start"
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tower in front of the sample (s) and "stop" tower behind.
5.4 Allow 30 minutes dark adapt time, with door closed then turn the Sample Chancer switch to coerate.
5.5 When counting is complete switch sample changer to STOP during a count.
5.6 Record count rate in counts / min for each sample type on form 1710.2-1 attached.
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192 074 2.0
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'BPP.lIl0 Revision 2 09/07/76
6.0 BACKGROUND
BLnNK PREPARATION, CALCULATIONS AND EXAMPLE 6.1 Environmental and other low level samples.
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6.1.1 Into a clean counting vial pipet:
15.0 mis Instagel solution 5.0 mis low tritium (DI) water 6.1.2 Cap tightly, shake vigorously and label on the cap only.
6.1.3 Wipe outside of vial to remove fingerprints etc., and insert in counting instrument.
6.2 Primary coolant and other hiah level samples.
6.2.1 Into a clean counting vial pipet:
10.0 mis Instagel solution 1.0 mis low tritium (DI) water 6.2.2 Cap tightly, shake virgorously and label on the cap only.
6.2.3 Wipe outside of vial to remove fingerprints etc., and insert in counting instrument.
6.3 Printer output.
6.4 Calculations Total Counts Minntes Counted Background c/m
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u 192 075 3.0 i
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, *s TMINS 09/07/76 Counting Room Ins:rument Log Channel 2
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DETECTOR INSTRUMENT SOURCE COUNTING TIME DPM BKG Vial BKG Vial BKG Vial BKG Efficiency Date
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CPM Time Counted (minutes)
DPM Form 1710.2-1
TMINS
'*'y Counting Room Instrument Log Revision 2 09/07/76 Channel 1 DETECTOR INSTRUMENT SOURCE COUNTING Ti.'.1E DPM BKG Vial B KG Vial BKG Vial BKG Efficiency Date
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Cahulations
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BKG (CPM)= Total Count?
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CPM Time Counted (Minutes)
Page 5 DPM Form 1710.2-1
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