ML19224B155
| ML19224B155 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/19/1977 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1761, TM-0138, TM-138, NUDOCS 7906140129 | |
| Download: ML19224B155 (6) | |
Text
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2 TMI D0CUMENTS DOCOMENT NO:
COPY MADE ON OF DOCUMENT PROVIDED BY
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METROPOLITAN EDISOt COMPANY.
Wilda R. Mullinix, NRC 9
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1761 If[([
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01/19/77
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t THREE MILE l$LANgjyUgR STATION STATION HEALTH PHYSICS -PROCEDURE 1751 OPERATION & CALIBRATION OF THE VICTOREEN VAMP Table of Effective Pages Paae Date Revision Paae Date Revision Pace Date R evision.
1.0 11/13/75 1
26.0 51.0 2.0 06/23/76 2
27.0 52.0 3.0 11/13/75 1
28.0 53.0 4.0 01/19/77 3
29.0 54.0 5.0 01/19/77 3
30.0 55.0 6.0 31.0 56.0 7.0 32.0 57.0 8.0 33.0 58.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.0 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 70.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 24.0 49.0 74.0 25.0 50.0 75.0 Unit 1 Staff Recommends A proval Unit 2 Staff Recommends Ap royal Approval 2l Date I!!7!77 Approval Date I /'7[7~7 n
Cognizant Dept. Head Cognizant Dept. Head Unit 1 PORC Re mmenr' f App val Unit 2 PORC Re ommend$ Ap oval Date Date Chairma of RC l
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Unit S4penntendent
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HPP 1761 Revision 1 11/13/75 THREE MILE ISLAND NUCLEAR STATICN STATION HEALTH PHYSICS PROCEDURE 1761 OPERATION AND CALIBRATION OF THE VICTOREEN VAMP 1.0 PURPOSE The purpose of this procedure is to explain in detail the operation and calibration of the Victoreen Vamp.
2.0 DISCUSSION 2.1 The 808 C Victoreen Vamp is a self-contained instrument which measures gamma radiation levels over a three decade range, and presents an audible and visual alarm at a set point within this range.
2.2 The range of Victoreen Vamp is 0.1 mR/hr to 100 mR/hr.
2.3 Accuracy of the Victoreen Vamp is + 10% of actual intensity from 8t-kev to 2 meV.
2.4 Alarm trip point is internally adjustable from background to full scale.
3.0 REFERENCES
3.1 Victoreen Instruction Manual 4.0 EQUIPMENT J.1 Victoreen Vamp Model 808C.
4.2 Low Range Calibrator 64-764.
5.0 OPERATING INSTRUCTIONS 5.1 Connect the line cord to a source of ac power.
The left, white panel or fail-safe light will be illuminated in two or three seconds. The gamma radiation level in milliroentpens
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per hour (r.R/hr) may then be read'from the meter.
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179 242 1.0
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1761 Revision 2 06.'23/76 5.1.1 The alarm trip point may be set to any desired level by adjusting the knob located inside the instr.:-'.ent.
The trip point may be read on the meter by dejressing the button just to the right of the alarm light.
5.1.2 If the radiation level is above the alarm set level, the red alarm panel will be illuminated and the loudspeaker will sound.
To stop the alarm, the white reset button on the front panel,:ust be depressed. To keep the alarm off after the reset tutten is released, the radiation level must be reduced or the alarm set level mu be raised.
5.2 Calibration of Victoreen Vamp.
5.2.1 Using the low range calibrator (Victoreen 64-764) set the Victoreen Vamp a specified distance from the calibrator for a reading of approximately 0.1 mR/hr. Adjust the R-69 calibration 137 pot for that reading. Table 1761-1 gives distances frcm the Cs source in the Victoreen 64-764 calibrator for desired exposure rates as calcula ed on June,1973. Minor adjustments of these values will be necessary due to the decay of the Cs source.
5.2.2 Set the Victoreen Vamp at a distance from the low range calibrator to obtain a reading of approximately 10mR/hr (see Table 1761-1). Adjust R34 calibration pot to corresoond to the calculated exposure reading at that distance.
5.2.3 Repeat setps 5.2.1 and 5.2.2 until no further adjustments are required.
5.2.4 Place the Victoreen Vamp at the calcuirted distance from the 64-764 calibrator for a reading of approximately 100 mR/hr
- approximately 58 cm, (see Table 1761-1).
Make any adjustments
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necessary with R25 calibration pot.
f8g 2.0
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1761 Revision 1 11/13/75 5.2.5 After calibration is completed place a calibration sticker on the Victoreen Vamp with date of calibration and initials of individual performing the work.
Also enter this information in the instrument log book which is located in the H.P. Lab.
189 244
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3.0
Revision 3 q..
HPP 1761
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01/19/77
. DISTANCE - EEOSURE RELATIO?SHI? 0F T'iE cVICTOREE's 6 4-764 AS OP OCT, 1970 X -Correction factior
. Dose Rate.= Dose.ra,te from Tabl.e below
. for Source decay -
1 3.5 cm = 27.05 R/hr
'22 cm = 0.68 R/tr 41 cm = 196 mR/hr 4 cm
= 20.625 R/hr 23 cm = 0. 62 R/h -
42 cm = 187 mR/hr 5 cm
= 13.2 R/hr 24 cm = 0.57 R/hr 43 cm = 179 mR/hr 6 cm
= 9.17 R/hr 25.ca = 0.53 R/hr 44 cm = 171 mR/hr
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7 cm
' #.73.R/hr 26' cm- = 0. 49 R/hr 4'S cm = 153 mR/hr
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s 8 cm
= 5.16 F/hr 27 cm = 0.4 5 3 R/in-46 cm = 155 r.R/hr
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9 cm
= 4.01 R/hr 28'.cm = 0,421 R/hr
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'i+7 cm = 149 m.3/hr 10 cm = 3.3 R/hr 29 cm = 0.39'R/hr 48c[a=743mR/hr 11 cm = 2.73 R/hr 30 cm = 0.367 R/hr 49 cm = 137 mR/hr 12 cm = 2.29 R/hr 31 cm = 0.343 R/hr 50 cm = 132 mR/hr 13 cm = 1.95 R/hr 32 cm = 0.322 R/hr 51 cm = 127 mR/hr 14 cm = 1.68 R/hr 23 cm = 0.303 R/hr 52 cm = 122 mR/hr 15 cm = 1.47 R/hr 34 cm = 0.286 R/hr 53 cm = 118 mR/hr 16 cm = 1.29 R/hr 35 cm = 0.269 R/hr 54 cm = 113 mR/hr 17 cm = l.14 R/hr 36 cm = 0.2'55 R/hr 55 cm = 109 mR/hr s.
18 cm = 1.02 R/hr 37 cm = 0.241 R/hr 56 cm = 105 mR/hr 19 cm = 0.91 R/hr 38 cm = 0.229 R/hr 57 cm = 102 m3/hr 20 cm
='O.825 R/hr 39 cm = 0.217 R/hr
'58 cm = 98 mR/hr 21 cm = 0.75 R/hr 40cm=0.206k/hr 59 cm = 85 mR/hr
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5.
- 3 4.0 Table 1761-1 7 -
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HPP 1761
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.' Revision 3 01/19/77
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rs
~'60 cm = 92 mR/hr 350 cm = 2.7 mR/hr 65 cm = 78 mR/hr 375 cm = 2.3 mR/hr t.
70 cm - 67 mR/hr 400 cm = 2.'l mR/hr
.1 75 cm = 59 mR/re-450 cm = 1.6 mR/hr
. 80 cm = 52 =R/hr 50 cm = 1.3 mR/hr.
550 cm = 1.1 mR/hr 85 cm = 46 mR/hr I
90 cm = 41 mR/hr 600 cm = 0.9 mR/hr 95 cm = 37 mR/hr 650 cm
- 0. P ra/hr 100 cm = 33 mR/hr '
/00 cm = 0.7 mRjhr
,110 cm '= 27 mR/hr -
750 cm = 0.6 mR/hr".
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l'20 cm = N mR/hr 800cm=.0.5mR/b.
.130 cm = 20 mR/hr
', 900 m.= 0.4 mR/hr
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140 cm = 17 mR/hr
- 1000 cm = 0.3 mR/hr t
150 cm = 15 mR/hr 5250 c= = 0.2 mR/hr 160 cm = 13 mR/hr 1500 cm :.0.1 mR/hr 170 cm = 11 mR/hr To convert these readings to be correc,t, use the following Table for conversions and updating of D,ose Rates.
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190 cm = 9 mFJhr Conversion Factor Year Conversion Factor
. Year
.866 Oct, /6
.707 Oct. 85 200 cm =.8 mR/hr
.851 Oc.t. 77
.691 Oct, 86 210 cm = 7.5 =R/hr
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831 Oct, 78
.675 Oct, 87
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.81 2 -
Oct,'79
. 6 6-Oct, 88 220 cm = 6'.S mR/hr
.794 Oct', 80
.645
'Oct; 89 230 cm = 6.2 mR/hr
.776 Oct, 81
.630 Oct, 90
.758 Oct,.82
. 61 6 -
Oct, 91 240 cm =,5.7 mR/hr
.741.
Oct, 83
.602 Oct, 92 250 cm = 5.3 mR/hr
.724 Oct, 84
.588 Oct, 93 275 cm = 4.4 mR/hr
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.300 cm = 3.7 mR/hr o
325 cm 4 3.1 m.Vnr Table 1761-1 (Cen't) 5.0
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