ML20217G637
| ML20217G637 | |
| Person / Time | |
|---|---|
| Issue date: | 07/05/1989 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20217G634 | List: |
| References | |
| SSD, NUDOCS 9710140089 | |
| Download: ML20217G637 (3) | |
Text
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NR 80% D %ot %
r REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVAL, TION Of-DEVICE (Correc ad Page) jul 0 5.1989 i
NO.:
NR192D1010, DATE:
' August 18.-1965 PAGE 1-OF 3 4
DEVICE TYPE:
Gauge Source Holder PODEL: !ML-1-1 MANUFACTURER /0!STRIBUTOR:
Brun Sensor Systems, Inc. - Mfr.
1150 West Third Street Columbus. OH 43212 MANUFACTURER / DISTRIBUTOR:
Brun Corporation - Dist.
SEALED SOURCE MODEL DESIGNATION:
Numec SG Nuclear Chicago 850233 ISOTOPE:
Cesium-137 MAXIMUM ACTIVITY:
50 millicuries.
LEAK TEST FRE0VENCY:
6 months
. PRINCIPAL USE:
'(D) Ganna Gauge CUSTOM DEVICE:-
YES X N0 9710140009 970929 4
e REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES l
SAFETY EVALUATION OF DEVICE'
<NO.:
NR19201010 DATE:
August 18, 1965 PAGE 2 0F 3 DEVICE TYPE:
Gauge Source Holder J
DESCRIPTION:
The outer physical characteristics of the ML-1-1 are those of a closed steel cylinder seven inches in height by 6 and 5/8 inches in diameter mounted, with its longest axis vertical, on a 1/2 inch steel plate. The plate, welded to the bottom of the device, serves as the base-and includes four 1/2 inch diameter-e mounting holes.
The base plate is 6 and 5/8 inches by 9 and 1/8 inches.
o Other external features include an electrical cable connector and a lock.
The lock prevents removal of the device's 3/4 inch thick steel cover riate which is normally held-in place by eight machine screws.
-The source of radiation is mounted at the center of a cylindrical shield consisting of two Mallory-1,000 cylindrical shields assembled and secured by three bolts running vertically from top to bottom exterior-to the shield components.
The bolts are anchored at the bottom to a 1/4 inch steel plate and at the top of a steel mounting plate which is attached by three machine screws to the cover c
5 plate.
The bottom half of the shield-assembly is also attached to the bottom j
steel plate by three angle brackets and six machine screws.
A rotary solenoid mounted at the bottom of the shve+d-essembly has its rotor attached to an aluminum cylinder which has a Mallory-1,000 shutter block attached by'four machine screws to the inner surface. The application of power to the solenoid causes-the rotor to act against a return spring moving the aluminum cylinder and shutter block 25' exposing the 5/32 inch wide by 13/16 inch high
' beam port which extends radially from the center of the lower shield component.
-Interruption of electrical power to the solenoid allows the return spring to move the shutter block to the shielded or "off" position.
Internally mounted-limit switches indicate the position of the shutter block as "on" or "off" by lights at the control console. Two green lights and two red-lights (each pair wired in parallel) are used.
Neither set of lights is on when the shutter block is in transit.
LABELING:
A metal label 3-3/8 inches by 2-3/16 inches, attached to the outside of the
- device 180* from the radiation beam, bears the following:
4 1
4
^+
~-*',
\\
REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUA'!0N.0F DEVICE NO.: _NR1920101U DATE:
August 18, 1965 PAGE 3 0F 3' I
DEVICE TYPE:
Gauge Source Holder 1
LABELit!G (CONT'D):
l
" CAUTION: RADI0 ACTIVE MATERIAL" Cesium-137 mc-(Date) l tiodel:
ML-1-1 Brun Corporation, Columbus Ohio The label is basically yellow in color with black lettering and a magenta radiation symbol.
EXTERNAL RADIATION LEVELSr
' Radiation levels at one foot from the surface of the ML-1-1 are everywhere less than 2 mr/hr_ with a 41 millicurie cesium-137 source.
The maximum radiation level of11.7 mr/hr is at_ the front of the device at a point on.a horizontal plane through the source 30' from the center of the beam port.
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
~The ML-1-1 cevice may be mounted at some distanace from the material to be measured and therefore~ consideration must be-given to access to the beam of radiation with the device in -the "on" condition. There is not a. mechanical or
-electrical "on-off" indicator at the device and the control panel may be located
- several-feet from-the device.
The user is instructed by the Brun Corporation to avoid tampering with the device containing the cesium-137 source. The Brun Corporation states that a service-contract will normally be sold with each ML-1-1 to= include six months visits by Brun representative for the purpose of inspecting the devices and-performing source leak-tests.
The Brun Corporation has also stated that they will install and relocate the source holders ar.1 pa-form a radiation ~ survey at the time of installation.
~ ISSUING AGENCY:
U.S. Nuclear Regulatory Commission 4
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