ML20211L053

Corrected Registry of Radioactive Sealed Sources & Devices, Safety Evaluation Device Source for Models 35-0102 & 35-0103.Certificate:NR-192-D-110-U

ML20211L053
Person / Time
Issue date:	07/05/1989
From:	NRC
To:
Shared Package
ML20211L037	List: ML20211L033 ML20211L040 ML20211L053
References
SSD, NUDOCS 9710100093
Download: ML20211L053 (6)

Text

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.T REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEV'CES SAFETY EVALUATION OF DEVICE (Corrected Page)

JUL 0 51989 fl0. : NR1920110U January 03, 1969 DATE: Pj': 10F4 DEVICE TYPE: Fill-Level Gauge Source Holder

-MODEL: 35-0102, 35-0103 MANUFACTURER / DISTRIBUTOR: Brun Corporation Columbus, OH MANUFACTURER / DISTRIBUTOR:

SEALED SOURCE MODEL DESIGNATION: Nuclear. Chicago 850233

!SOTOPE: Cesium-137 MAXIMUM ACTIVITY: 115 millicuries LEAK- TEST FRE00ENCY: 6 months

' PRINCIPAL USE: (D) camma cause CUSTOM-DEVICE: YES X NO 9710100093 970929-gg$

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REGISTRY OF RADI0 ACTIVE SEALED SOURCES ANC DEVICES SAFETY EVALUATION OF DEVICE January 3,1969 HO.: NR192D110U DATE,: PAGE 2 0F 4 l

OEVICE TYPE: Fill-Level Gauge Source Holder DESCRIPTION:

The outer physical characteristics of these devices are those of a cloted steel cylinder 5-1/2 inches in height and 3-1/2 inches in diameter, mounted with its longest axis vertical on a 1/4 inch thick steel bottom plate. The bottom plate is attached to the cylinder with eight screws. The 1/4 inch thick steel top

' plate is welded to the cylinder which has a wall thickness of 7/32 inch. A mounting bracket is welded to the cylinder wall. Each of the units is designed to be watertight.

'he only differences between the two units are in (1) the mounting brackets and slectrical conduit entrances which are attached to the bottom and sides of the units, and (2) the beam collimators. The 35-0103 has a 27' collimator and the 35-0102 has a 30* collimator. The angles are measured downward from the horizontal at the top of the source. The ports are both fan shaped and are 1/4 inch wide.

The source of radiation is mounted at the approximate center of a cylindrical shield consisting of two Mallory-1000 cylindrical shields fitted together one on top of the other. The lower shield section includes the beam port and suitable machined openings for the mounting of the Mallory-1000 source rotor. The source at the edge of the rotor is moved 45 degrees, in a horizontal plane, between the "On" and "Off" positions by the application of power to the rotary solenoid mounted at the bottom of the shield assembly and coupled to the rotor. The solenoid acts against a return spring _which returns the source to the shielded position when power is interrupted.

Internally mounted microswitches indicate the position of the source rotor as "On" or "Off" by parallel wired, dual, red and green lights at the control console.

LABELING:

A metal label 3-3/8; inches by 2-3/16 inches attached to the outside of the device 90' from the cable connector bears'the following:

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REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALVATION OF DEVICE NO.: NR192D1100 DATE: January 3,1969 PAGE 3 0F 4 DEVICE TYPE: Fill-level Gauge Source Holder LABELING (CONT'D):

" CAUTION: RADIDACTIVE MATERIAL Cesium-137 me Date of Measurement Model No. 35-0102 or 35-0103 BRUN CORPORATION, COLUMBUS, OHIO" The label is basically yellow in color with black lettering and a magenta radiation symbol, a

EXTERNAL RADIATION LEVELS:

In accessible areas at one foot from the surface of the devices are 3 mr/hr or less with a 61 millicurie, cesium-137 source in the "Off" position. A radiation level of 7 mr/hr exists over a small area in the region of the beam port which is inaccessible with the unit installed. Radiation levels for higher activities may be derived by extrapolation.

LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

The devices were evaluated on the basis that they will be mounted flush to the side of a steel mold thereby preventing access to the beam of radiation and reducing radiation levels in the forward direction to about 0.1 mr/hr. If vther applications are proposed, an evaluation of radiation levels in the forward direction will be necessary.

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 device to include visits at six month intervals by a Brun Corporation representative for the purpose of inspecting the devices and performing source leak tests.

The Brun Corporation has also stated that they will install and reloccte the source holders and perform radiation surveys at the time of installation.

Since an "on-off" indicator is not located at the source shield and since the control console may be remote from the shield, consideration must be given to exposure of persons not aware of the exposed position of the source.

REGISTRY OF RAD 10 ACTIVE' SEALED SOURCES AND DEVICES SAFETY EVALVATION OF DEVICE NO.: NR192D110U DATE: January 3,1969 PAGE 4 0F 4 DEVICE TYPE: Fill-level Gauge Source Holder ISSUING AGENCY:

U.S. Nuclear Regulatory Comission

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, , ., 4 O F F I,C I A L USE ONLY DEVICE l

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$NUFACTURER AND DISTRIBUTOR:

_. Ban _ Corporation

! Columbus, otno 1

jl.f),i ISOTOPE: )ODEL NO:

- As the source holder Cesium 137 bp to 50 ine 35-0101 component of a fill- in a Nuclear-Chicago

, level gage Model 850233 source) 4 i DESCRIPTION:

i i This devic e is identical to the Models 35-0102 and 35-0103 with the

.l exception v the location of the electrical conduit entrance.

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July 25, 1966 4

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OFF1C1AL USE ONLY

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