ML19224B375
| ML19224B375 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/23/1976 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1756, TM-0133, TM-133, NUDOCS 7906150016 | |
| Download: ML19224B375 (6) | |
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DOCUMENT NO:
COPY MADE ON OF DOCUMENT PROVIDED BY
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METROPOLITAN EDISON COMPANY.
4.
Wilda R. Mullinix, FRC i
I 7906150016
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Revision I DO NOT RENOVi-
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06/23/76 C0FROLLED CDP THREE MILE ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURE 1756 OPERATION AND CALIBRATION OF EBERLINE 6112 TELETECTOR DOSE RATE METER Table of Effective Pages Page Date Revision Page Date Revision Page Date Revision 1.0 02/13/74 0
26.0 51.0 2.0 02/13/74 0
27.0 52.0 3.0 06/23/70 1
28.0 53.0 4.0 06/23//6 1
29.0 54.0 5.0 06/23'76 1
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Date h N Approvalf-I(MA Date N Chnizant Dept. Head
{gnizar.i Dept. riead Unit 1 PORC Re. mmends ppr s al Unit 2 PORC ecomme ds Ap roval I
Date Date Chairrna i of ORC Chaq nan fP0 HCp PORC comment' of f
Tnciuded PORC commt nts o I
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Stati/n Su[lrintendent/4f Unit Supenntendent N 5 5-^
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~1756 2/13/74 Revision 0 THREE MILE ISLAND NUCLEAR STATION HEALTH PHYSICS PROCEDURE 1756 Operation and Calibration of Eberline 6112 Teletector Dose Rate Meter 1.0 PURPOSE The purpose of this procedure is to explain in detail the operation and calibration of the 6112 Teletector.
2.0 DISCUSSION 2.1 The 6112 Teletector is a portable, battery operated instrument for the detection and measurement of gamma fields.
The detecting elements, two Geiger tubes, are located in the end of a telescoping tube so that they may be extended up to 13 feet away from the rest of the instrument.
2.2 The teletector has five ranges of operation 0 to 2, O to 50 m'</hr and 0 to 2, 0_to 50, O to 100 R/hr.
The meter is equipped with a novable scale and when each range is selected, the scale for range appears in a window in the meter face.
2.3 When the gas in the Geiger tube is ionized by radiation, an electrical pulse is created which is amplified, shaped and con-verted to a pulse of current which is used to drive the meter.
3.0 REFERENCES
f 3.1 Servicing information for Teletector Model 6112.
4.0 EQUIPMENT 4.1 Eberline Teletector Model 6112.
137 60 4.2 Cs or Co gamma source 5.0 OPERATING INSTRUCTIONS 5.1 Description of external controls and connectors.
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1756 2/13/74 Revision 0 5.1.1 Seven position switch turns instrument 0FF, checks the 3
batteries and selects the range of operation.
- 5.1. 2 Earphone connector on side of instrument allows connection to the earphone supplied with the Teletector.
5.2 Description of internal controls.
5.2.1 Control P1, used to set the operating point for the high voltage supply oscillator.
5.2.2 Controls P2 and P6, used to calibrate the five ranges of operation.
5.2.3 Control P7, located inside the probe; used to aid in calibrating the 1000 R/hr range.
5.3 Using the instrument.
5.3.1 Set the switch to the B position.
The meter should indicate in.the black area on the scale and meter light should be on.
If it does not, change the batteries located in the handle.
Refer to Teletector Tech Manual.
f 5.3.2 Set the switch to the range position appropriate to the gamma field to be measured.
j 5.3:3 Place the detector, located in the end of the telescope, in position to take a measurement.
5.3.4 Read the meter directly in R/hr or mR/hr ac:ording to the switch position.
5.4 Calibration 5.4.1 Install four fresh "C" cell batteries, positive post in first, in the handle of instrument, then place "0" ring
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inside in groove.
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1756 Revision 1 05/23/76 5.4.2 Before opening instrument case, check all ranges in gamma fields to determine whether calibration adjectments are necessary.
Check the 2 mR/hr range in a field of approximately 1.5 mR/hr, the 50 mR/hr range at approximately 30 mR/hr, the 2 R/hr range at approximately 1.5 R/hr, the 50 R/hr range at approximately 30 R/hr and the 1000 R/hr range at approximately 400 R/hr.
(Gamma calibration source is located in the Heat Exchanger Vault).
5.4.3 If the check of 5.4.2 shows calibration is necessary, gain access to the calibration controls by removing the four screws in the bottom of the case and lifting the top cover assembly to one side.
Take care not to stress the interconnecting wires.
Remove the rubber gasket from Setween the two case halves. The calibration pots are accessihie between the circuit board and the top cover.
Refer to Teletector Servicing Information for identification b
of controls.
i 5.4.4 If the 1000 R/hr range requires calibration, access to P7 located in the detector housing must be gained.
Remove the rubber tip and extend the probe about four inches.
Insert a screwdriver blade into the slot at the base of the housing and unscrew the housing cover.
P7 is the only pot in the detector section.
3.0 I
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06/23/76 5.4.5 Set the instrument switch to the 2 mR/hr range.
1 Expose the detector to a field of approximately 1.5 mR/hr and adjust P5 for an equivalent reading on the meter.
5.4.6 Set the switch to the 50 mR/hr range.
Expose the detector to an approximately 30 mR/hr field and adjust P4 for an equivalent reading.
6 5.4.6 Set the switch to the 2 R/hr range.
Expose the detector to a field of approximately 1.5 R/hr and adjust P3, marked R29, for a equivalent reading.
Expose the detector to a field of approximately.21 R/hr, adjust P3 for an equivalent reading.
Recheck the reaoing of approximately 1.5 R/hr.
5.4.8 Set the switch to the 1000 R/hr range.
Expose the detector to a field of approximately 400 R/hr and adjust P7 (located in the detector section) for an equivalent reading.
Expose the detector to a field of approximately 46 R/hr, adjust P2 as necessary.
Recheck in a field of approximately 400 R/hr and adjst P7 as necessary.
The process is repeated until both points read correctly.
5.4.9 After performing step 5.4.8, set the switch to the 50 R/hr range.
Expose the detector to a field of approximately 43.6 R/hr and adjust P6 for an equivalent reading.
Check the lower scale reading by exposing the detector to a field of approximately 4.36 R/hr, adjust P6.
Recheck the readir,g of
' "1 approximately 43.6 R/hr.
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1756 Revision 1 06/23/76 5.4.10 Reassemble the instrument taking care to properly seat the case gasket.
5.5 Place calibration sticker on the instrument, initial and date.
t Record this information in instrument calibration book in Health Physics Lab.
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