ML20198R249
| ML20198R249 | |
| Person / Time | |
|---|---|
| Issue date: | 01/05/1999 |
| From: | Steven Baggett, Michele Burgess NRC |
| To: | |
| Shared Package | |
| ML20198R252 | List: |
| References | |
| SSD, NUDOCS 9901080134 | |
| Download: ML20198R249 (4) | |
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. REGISTRY'OF, RADIOACTIVE SEALED' SOURCES AND DEVICES -
SAFETY. EVALUATION OF DEVICE ,
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, ~NO,: NR-810'5-D-801-S '
-DATE: January 5,!1999' PAGE 1 OF 4 DEVICE TYPE: Instrument Calibratori <
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MODEL:- 8150-12 0- Cs >- l l
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MANUFACTURER / DISTRIBUTOR: ThermoRetec ,
, -(Formerly TMA/Eberline) i 7021 Pan American' Freeway,-NE ;
' Albuquerque, NM.87109
' SEALED SOURCE MODEL DESIGNATION: American Nuclear Corp.
Model 127-0 $
ISOTOPE: MAXIMUM ACTIVITY:
Cesium-137 120 Ci (4.44 TBq) i, LEAK TEST FREOUENCY: 6 Months i ,
PRINCIPAL USE: (I) Calibration Sources (Activity i greater than 30 mci) k
. CUSTOM DEVICE: YES X NO i
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t ,, f l- REGISTRYI OFdRADIOACTIVE SEALEDJSOURCES AND DEVICES'
, / S A F E T Y, E V A L U A T I O N ' O F.; D E V I C E .-
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NO.: .NR-8105-D-801-S DATE: . January 5, 1999. PAGE 2 OF 4 ,
. A DEVICE TYPE: . Instrument Calibrator
, , DESCRIPTION:
The gamma calibration units consist of a welded 1/4" (6.35 mm) steel cylinder, 18" (45.72 cm) in diameter and'25.5" (64.77 cm)
.high with:a.2:"-(5.08 cm) cylindrical hole running from top to bottom through the center. Three access plugs are located on top
, .and bott'om o' the cylinder.for filling and draining of lead shot.
cThe? lead shot provides shielding for the unit. When filled with lead shot the unit weighs approximately 2,500" pounds-(1,134 kg).
An orifice.(beam exit), which allows a collimated 15* radiation beata, is located on the side of the unit. A steel jacketed solid
. lead plug is-inserted in the bottom of the 2" (5.08 cm) '
. cylindrical. hole and bolted in place. Two solid lead' plugs are cinserted'in the upper portion of the 2" (5.08 cm) cylindrical hole. These plugs form a part of the lifting mechanism. A stainless steel source holding cup is attached to the bottom of the outer plug. The. inner plug can be removed to insert the '
source. A solid lead filler plug fills the void between upper and lower plugs. ,
A hand operated' lever is used to lift the source into a fixed ,
y -position in the beam orifice. Before the lever can be raised, quick-release pins must be removed and after the source is raised
. the release pins Imast be replaced to keep the source in the open position. The source lifting mechanism can be locked in the ;
- closed position when'the unit is not in use. j Two interlock switches control the lighting system which
. indicates the position of the source. When the source is in the ,
safe condition, a white light is lighted. When the source is moved to the open position, the white light is extinguished and a red light is lighted. When the source has been moved to a location where radiation is emitting from the beam orifice, a howler is activated. The howler is an electronic device, not obtrusively loud, which gives the operatur additional warning that the source is up.
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. SAFETY ;FNALUATION OF, DEVICE .
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i Q. .5,t NO.: NR-8105bD-801- S , DATE: , January 5, 1999 ' PAGE 3 OF 4 '!
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o, r DEVICE TYPE: Inst'i-ument Calibrator !
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!L&gELING: ,
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.The' device was. labeled in accordance with the provisions of- ,
10 CFR 20,.1901. !
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. EXTERNAL RADIATION LEVELS:
. The ' calibrator' was ' designed.. to have a- dose rate' less than 1: mr/hr (10 11Sv/hr) on the - surface with the source 'in the safe position.
Tactual radiati'on profiles were not submitted. .
, LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
-The radioactive' source in the calibrator is: easily accessible.
, ;TheLoperating manual accompanying the' calibrator' describes '
" methods : for; removal: of: the ' source from the calibrator. .
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'The gammatcalibration. unit is normally. mounted on a cart assembly l and'~ utilized as part of'a'Model 8150-120-Cs-101 gamma calibration
,; range. . When applying for-authorization to use this type of-unit, .
'the' applicant should submit a complete description of his )
- calibration 1 facility and operating procedures.
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SAFETY ANALYSIS
SUMMARY
.The Model 8150-120-Cs is'no longer manufactured or distributed by I p _ThermoRetec:and ThermoRetec has'no. intention to produce them any more inLtheffuture. Therefore, the registration certificate is
'beingl.converte,d'to an inactive registration certificate. i i
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1, .; s l REGISTRY [OF~ RADIOACTIVE ~ SEA 7.ED-SOURCES AND DEVICES g {! 1 - SAFETYfEVALUATION OF DEVICE NO,::NR-8105-D-801-S, '
' DATE: January 5,1999 PAGE 4 OF 4 DEVICE TYPE: = Instrument Calibrator.
' SAFETY ANALYSIS
SUMMARY
(Cont'dli The device was originally approved for licensing' purposes by the-AEC. This certificate was transferred to the Agreement State of New Mexico,and recently returned to the NRC. Because of'the
~ limited information-available on this unit, no safety evaluation of the. device was-performed as part of the conversion of the certificate to inactive status.
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ISSUING AGENCY: '
U.S. Nuclear Regulatory Commission '
Date: January 5, 1999 Reviewer: Y M Michele Burgess
~Date: Januarv 5. 1999 Concurrence: - - -
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- " Steven'Baggett
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