ML20198R144
| ML20198R144 | |
| Person / Time | |
|---|---|
| Issue date: | 01/05/1999 |
| From: | Steven Baggett, Michele Burgess NRC |
| To: | |
| Shared Package | |
| ML20198R112 | List: |
| References | |
| SSD, NUDOCS 9901080107 | |
| Download: ML20198R144 (5) | |
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4 REGISTRY,OF RADIOACTIVE SEALED SOURCES'AND DEVICES
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-' SAFETY EVALUATION OF DEVICE
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NO.:iNR-8105-D-802-S DATE : ' January 5, ' 1999, PAGE 1 OF 5 i
' DEVICE TYPEI' ' Instrument Calibrator
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MODEL:
.8150-XXXAB i'
MANUFACTURER / DISTRIBUTOR:
TuermoRetec (Formerly TMA/Eberline) 7021 Pan American Freeway, NE Albuquerque,.NM 87109
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SEALED SOURCE MODEL DESIGNATION:
American Nuclear Corp.
Model 127 i
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-MAXIMUM ACTIVITY:
Cesium-137 120 Ci (4.44 TBq)
- LEAK TEST FREOUENCY:
6 Months PR'INCIPAL USE (I) ' Calibration Sources (Activity greater than 30 mci) a-
' CUSTOM' DEVICE:
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s REGISTRY bF RADIOACTIVE SEALED SOURCES'AND DEVICES SAFETY EVALUATION.OF. DEVICE NO,: NR-8105-D-802-S DATE: Janwny 5,1999 PAGE 2 OF 5 DEVICE TYPE:
Instrument Calibrator
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DESCRIPTION:
.The Model 8150-XXXAB-" Gamma Calibration Range" includes a source
' shield'and cart assembly, a back shield assembly (37" x 37"
.[93.98 cm x 93.98 cm],
4"
[10.16 cm) lead shot, 1/2" [1.27 cm]
steel), an instrument cart assembly, rail assembly (7' [2.13 m) long), five attenuators (reduction factors of 0, 10, 100, 1000, and 10000) a mirror and binoculars.
The last five symbols of the model number describe the type and amount of activity in each individual unit, e.g., 8150-120Cs would indicate a 120-curie (4.44 TBq)'Cs-137 source.
This is the only source loading on which we have radiation profile data, but Eberline has indicated that other sources may be used.
The main shield of the gamma' calibration unit consists of a welded, 1/4" (6.33 mm) thick wall 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 bottom of the cylinder for filling and draining of the lead shot used as shielding.
VRien. filled with lead shot the unit weighs approximately 2,500 pounds (1,134 kg).
A circular orifice (beam exit), which allows a collimated 15" radiation beam, 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 concentric solid lead plugs are inserted in the upper portion of the 2" (5.08 cm) cylindrical hole.
These plugs form a part of the' source 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 down through the center of
.the outer plug and into the source holder cup.
A solid lead
. filler. plug fills the void between upper and lower plugs.
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REGISTRY"OF RADIOACTIVE: SEALED SOURCES AND DEVICES
. y SAFETY EVALUATION OF DEVICE x
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. EQ4 NR-8105-D-802-S (DATE: January 5, 1999 PAGE '3 OF'5 x
- DEVICE TYPE:
Instrument-Calibrator.
DESCRIPTION (Cont'd):
'A hand operated-lever is used to lift the source (and the two i
concentric upper" plugs) into a fixed position opposite the beam orifice.
Before the lever can be raised, quick-release' pins must 1be released and'after the source is raised the release pins must j betreset to keep 3 the. source in the open position.
The source
' lifting mechanism can be locked in the closed position when the unit is-not11n use.
Two microswitches 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 from.the safe' position, the white light is extinguished and a red light ~is lighted.
When the source has been moved to the up position (source opposite (the beam orifice), a continuous
" howler" is' activated.
The howler is an electronic device which gives the operator additional warning that the scurce is up. The
-electrical. system provides for a tap parallel to the howler coil
- to furnich-power to an external interlock, etc.
.In addition, a' bright red and white striped decal on the outer plug (part of the source lifting mechanism) indicates the source position as "up" or "down".
, Attenuators are exchanged manually and are held in place by two thumb screws.
- LABELING:
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- TheLmain. shield bears a' label (magenta.on yellow) with " DANGER,
' RADIOACTIVE MATERIAL",'and the type and amount of contained
- activity. - The: shield also' bears an " Instruction Tag" located near the-sourcefraising handle which bears sequential procedures
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,.for'usingithe' device.
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION'OF DEVICE NO,;. NR-8105-D-802-S DATE: Janamy 5,1999 PAGE 4 OF 5 DEVICE TYPE:
Instrument Calibrator EXTERNAL RADIATION' LEVELS:
With a'120-curie (4.44 TBq) cesium-137 source, "O" attenuator and source "up",
maximum radiation levels are:
Majn Shield Top (source-raising handle)
- <0.2 mr/hr (2 pSv/hr)
Side (other than port) 2 mr/hr (20 pSv/hr)
At side of attenuator (in port) 30 mr/hr (300 pSv/hr)
Back Shield (about 7 ft f2.13 mi from shield) l Backside 1 mr/hr (10 pSv/hr)
Top' 12 mr/hr (120 pSv/hr)
Side 9 mr/hr (90 Sv/hr)
Bottom 6 mr/hr (60 pSv/hr)
With "10,000" attenuator (normally used for storage) and source "down":
Top
<0.1 mr/hr (1 pSv/hr)
Sidc 0.2 mr/hr (2 pSv/hr)
At center of attenuator 4 mr/hr (40 pSv/hr)
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
The radioactive source in the calibrator is easily accessible.
The operating manual accompanying the calibrator describes j
methods for insertion and removal of the source from the calibrator, but does not include complete procedures for these operations.
When applying for authorization to use this type of unit, the applicant should submit a complete description of his calibration facility'and operating procedures.
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND.. DEVICES E
SAFETT EVALUATION OF DEVICE 4
'l' NO.: NR-8'105-D-802-S DATE: January 5;.1999 PAGE 5-OF 5 F
DEVICE TYPEi Instrument Calibrator:
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LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE (Cont'd):
Eberline states that thEy will install the source, check out the i
complete-range,- instruct.the customer in use of the range and check radiation levels!around-the device for compliance with
<1evels, reported to'the Commission.
Eberline says they will
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furnish a. radiation profile of the main shield and maintenance
-and' repair services only if the customer requests them.
t SAFETY-ANALYSIS
SUMMARY
The'Model 8150-XXXAB is no longer manufactured or distributed by l
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ThermoRetec!and ThermoRetec has no intention to produce them any moreLin the future.
Therefore, the registration certificate is
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. being converted.to an inactive registration certificate.
1 The device was originally approved for licensing purposes by the j
e AEC.
This' certificate was transferred to the Agreement State of
.New Mesico and recently returned to the NRC.
Because of the l
- 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.
' ISSUING' AGENCY:
U.S. Nuclear Regulatory Commission l
JDate: :.Tann a rv 9 1000 Reviewer:
d4e# M Michele Burge"ss Datei January 5, 1999 Concurrence:
A Steven Baggett k
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