ML19224B204
| ML19224B204 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/07/1976 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1712, TM-0119, TM-119, NUDOCS 7906140213 | |
| Download: ML19224B204 (3) | |
Text
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DOCUMENT NO:
5 l/, 7,9 0F DOCD'ENT PRomED BY COPY MADE ON g -
METROPOLITMi EDISON COMPMlY.
Wilda R. Mullinix, NRC 79061402I3 I
10 3 2
IYlMO I C.N LUFT 5i iL Revision 1
DO NOT REMOVE
' '"6 THREE MILE ISLAND NUCLE AR STATION STATION HEALTH PHYSICS PROCEDURE 1712 SACKGRCUND DETERMINATION LUDLUM 2000 Table of Ef fective Pages Pace Date Revision Pace Date Revision Pace Date R wision 1.0 09/07/76 2
26.0 51.0 2.0 01/21/74 0
27.0 52.0 3.0 28.0 53.0 4.0 29.0 54.0 5.0 30.0 55.0 6.0 31.0 56.0 7.0 32.0 57.0 8.0 33.0 58.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.0 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 70.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 24.0 49.0 74.0 25.0 50.0 75.0 Unit 1 Staf f Recommends Approwl Unit 2 Staff Recommends Approval Approval 0 MWkM Date Approval 6 MMLW Date
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1712 Revision 2 09/07/76 THREE MILE ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURES 1712 - Background Determination Ludlum 2000 1.0 PURPOSE The purpose of this procedure is to list the steps taken to deter-mine the background count rate of the Ludlum 2000 apparatus.
2.0 DISCUSSION Cue to the variation of background radiation, a background count rate must be determined daily and each time the instrument loca-tion is changed.
This instrument, with the use of different detectors may be used for Alpha and/or Beta counting. A back-grcund count rate must be determined for each detector used.
3.0 REFERENCES
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Ludlum Model 2000 Instruction Manual.
4.0 EQUIPMENT 4.1 Ludium 2000 Instrument 4.2 Detectors 4.2.1 Model 43-2 Alpha Scintillation Detector (cr equivalent) 4.2.2 EIC Model HP-210 G.M. Detector (or equivalent) 4.2.3 END Window G.M. Pig Mounted Detector (or equivalent)
NOTE: Line voltage should be used whenever available since the the internal batteries are not rechargeable.
1.0 (05
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,s L712 1/21/74 Revision 0 5.0 CPERATING INSTRUCTIONS 5.1 Install the desired alpha or beta-gamma detector in its appropriate sample holder to obtain reproducible counting gecnetry.
5.2 Attach the probe lead to the PROBE connection on the scaler.
5.3 Place the selector switch in BAT, or LINE if line voltage is available.
If BAT position is selected, depress BAT button and check " SAT OK" indication.
If battery replacement is required, refer to Instruction Manual.
5.4 Set minutes selector to 10 or as desired.
5.5 Ensure multiplier toggle switch is in "1" position.
5.6 Insert a clean dry planchet in sample holder in geomet to be used.
5.7 Depress the COUNT button to start counting.
5.3 At the ccmpletion of counting (red COUNT light out), record the total counts in the Counting Room Instrument Log.
5.9 Divide the total cnunts obtained by the total time counted (in minutes), to obtain background counts /nin. as per equation of Section 6.0.
5.10 This value, with time and date of calculation, is then recorded in the Counting Room Instrument Log.
5.11 Switch counting detectors if desired ant complete Steps 5.1 through 5.10 with each detector.
6.0 CALCULATIONS 6.1 Total counts (Steo 5.8) counts
= Backgrcund count rate Total count time (Step 5.4) min e:
2.0