ML20203D882
| ML20203D882 | |
| Person / Time | |
|---|---|
| Issue date: | 07/16/1987 |
| From: | Steven Baggett, Stephen Bell NRC |
| To: | |
| Shared Package | |
| ML20203D852 | List: |
| References | |
| SSD, NUDOCS 9902170015 | |
| Download: ML20203D882 (8) | |
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- REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE l
.NO: NR-126-D-101-G
'DATE:
JUL 1. 667 PAGE:
1 of 7 6
DEVICE TYPE:' ' Argon' Purity. Analyzer
.MODEL:
-IMA-1A MANUFACTURER / DISTRIBUTOR:
Air Products and Chemical Inc.
Box 538
'Allentown, PA 18105 SEALED SOURCE MODEL DESIGNATION:
Safety Light Corporation Detector Cell No. 4402A ISOTOPE:
MAXIMUM ACTIVITY:
Hydrogen 3 50 millicuries i
' LEAK. TEST FREQUENCY:
6 Months.
i
- PRINCIPAL USE:
(N)IonGenerator, Chromatography i
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CUSTOM DEVICE:
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE
.NO: 'NR-126-D-101-G DATE:
JUL 161987 PAGE: 2 of 7
' DEVICE TYPE:
Argon Purity Analyzer DESCRIPTION:
-The APCI Argon Purity Analyzer (Model IMA-1A) unit's sole purpose isl the determination of nitrogen levels in an argon gas stream. The instrument contains an electron capture detector'(ECD) cell that uses as its ionization source, a 50 mC1 titanium'tritide foil.
The. foils, obtained from Safety Light Corporation are 0.5 cm in diameter and have the tritium deposited onto the foils as titanium tritide.
The sealed source is made by crimping a disc of the foil to a brass holder.
The cylindrical-unit is then press ' fitted with 30001.bs of force on the rim into the~ outer brass coaxial cylinder.
Because of the method _of construction and the use of tritium, shielding by the brass cylinder.is adeouate for safety plus, once completed, they are cleaned until surface contamination is.less than.100 picocuries when measured using
" swipe-testing" and a liquid ~ scintillation counter.-
The cell containing the source is swaged into a coupling inside a 30 W heater, which can not exceed 180'C at full power, which is itself sealed with two
' metal screws,' thus adding another layer of protection. This assemblage, plus its relevant electronics, is then used as a " stand-alone" or is installed as
-the detector cell in a process chromatograph.
LABELING:
The label (s) meet the requirements of 10 CFR, Section 32.51(a)(3).
The. label (s)=shown below will be attached to the unit-in the following
^ positions..: One on the cell:itself, with a clear, shrink fitted cover; one on the outside of the~ heater compartment, and the third on the front exterior of
.the instrument casing.
In addition.to these, a " lockout" tag that says "no radioactive source in unit":will be provided that is to be placed on top of the exterior label if the-detector cell has been removed for any valid reason.
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES j
SAFETY EVALUATION OF DEVICE NO: NR-126-D-101-G DATE:
JUL 161987 PAGE: 3 of 7
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i DEVICE TYPE:
Argon Purity Analyzer LABEL:
CAUTION: CONTAINS RADI0 ACTIVE MATERIAL j
This detector cell, Model 4402A, contains 50 millicuries of radioactive tritium which has been sealed into the detector cell. Any attempt to disassemble the detector cell and remove the radioactive source is prohibited under NRC regulations.
Installation instructions and other pertinent information regarding safe operation, maintenance and servicing may be found in the APCI Argon Purity Analyzer Operating and Maintenance manual for the Model IMA-1A.
This device is exempt from NRC leak testing requirements due to the isotope used and its level of radioactivity.
The receipt, possession, use, and transfer of this device are subject to a general license or the equivalent and the regulations of the NRC or of a state with which the NRC has en.tered into an agreement for the exercise of i
regulatory authority. This label shall be maintained on the device in a legible condition. Removal of this label is prohibited.
l DIAGRAM:
A sketch'of the cell is shown below,
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,.n I J CELL ASSEMBLY A diagram of exterior of the device can be seen in atta'chment 1.
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I REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE l-
- NO
- NR-126-D-101-G DATE: JUL 161987 PAGE: 4 of 7 DEVICE TYPE:
-Argon Purity Analyzer
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I CONDITION OF NORMAL USE:
I The analyzer is either (a) a stand-alone purity analyzer or (b) a detector unit in a process gas chromatograph, both of which are used to determine nitrogen levels in gaseous argon streams.
'As a stand-alone unit, process gases are bled from the main line and analyzed for nitrogen contamination.. The process chromatograph is used when oxygen has to be separated from the gas stream.
In either case, the working environment 1
is that of an industrial air separation / liquefaction plant. Under these
~
conditions, the. units are designed to operate with a minimum of maintenance-
'and to:be usable by personnel without specific: training'in the use of-radioisotopes.
.Under' normal conditions, the expected life of the cell is 16-18 months, after which, the sealed cell is removad and replaced by a new cell.
f EXTERNAL RADIATION LEVELS:
(Each'd'etector contains a titanium tritide foil with an activity of 50 Lmi111 curies of tritium as the radiation source. Since the beta particles i
emitted are not energetic enough to penetrate the outermost layer of skin, hazards are at a minimum when beta radiation is outside the body.
However, beta particles cannot penetrate the detector cell, and hence, under ordinary conditions of storage, handling, and use, exposure of general I
licensees (under Section 31.5, 10 CFR Part 31) to 0.5 rem per year is extremely unlikely.
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e REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO:
NR-126-D-101-G DATE: JUL 161987 PAGE:
5 of 7 DEVICE TYPE:
Argon Purity Analyzer QUALITY ASSURANCE AND CONTROL:
The quality controls used in the fabrication of the cell are twofold.
Firstly, all physical dimensions are checked with precision instruments, because the sealing of the device is dependent upon the interference fitting i
of the ends. Secondly, no assembled cell is permitted to be used unless a swipe test of the exterior surfaces of the cell shows a figure of less th;n i
100 picocuries by liquid scintillation counting.
If the initial fig::;es are above this figure, the cell is cleaned until below, or alternatively, is discarded as unusable using correct disposal technioues for rad waste. Records are kept of all swipe tests, and cells are sequentially numbered. Cells that are returned to APCI as out of specification for analytical use are NOT disassembled but are disposed of in rad waste.
LIMITATIONS AND/0R OTHER CONSIDERATIONS OF USE:
The device is to be distributed for use under the NRC general license provisions of Section 31.5,10 CFR nr equivalent requirements of an Agreement State.
The device shall be leak tested at six (6) months intervals using techniques capable of detecting 0.005 microcurie of removable contamination.
This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC.
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1 REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO:
NR-126-D-101-G DATE:
JUL 161987 PAGE: 6 of 7 DEVICE TYPE:
Argon Purity Analyzer i
SAFETY ANALYSIS
SUMMARY
Air Products and Chemicals, Inc. has submitted sufficient information to provide reasonable assurance that:
The device can be safely operated by persons not having training in radiological protection.
Under ordinary conditions of handling, storage, and use of the device, the byproduct material contained in the device will not be released or inadvertently removed from the device, and it is unlikely that any person will receive in any period of one calendar quarter a dose in excess of 10 percent of the limits specified in l
the table in Section 20.101(a), 10 CFR 20.
Under accident conditions (such as fire and explosion) associated with handling, storage, and use of the device, it is unlikely that any person would receive an external radiation dose or dose j
commitment in excess of the dose to the appropriate organ as specified in the following chart:
PART OF BODY REM 4
Whole body; head and trunk active blood-forming organs; gonads; of lens of eye 15 Hands and forearms; feet and ankles; localized areas of skin averaged over areas no larger i
than 1 square centimeter 200 Other organs 50 Based on the above and the information referenced below, we conclude that the l
device is acceptable for distribution to specific licensees and to general
)
licensees.
Further, we conclude that the source housing can be expected to maintain its containment integrity adequately for normal conditions of use and l,
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.for accidental conditions that might occur.during use.
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6 REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO: NR-126-D-101-G DATE:
JUL 16 tw/
PAGE:
7 of 7 I
DEVICE TYPE:
Argon Purity Analyzer l
REFERENCES:
The following supporting document for the IMA-1A Argon Purity Analyzer is hereby incorporated by reference and is made a part of this registry document:
Air Products and Chemical Inc., letter dated September 29, 1986 with enclosures thereto.
ISSUING AGENCY:
U. S. NUCLEAR REGULATORY COMMISSION i
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JUL 161987 REVIEWER: / d
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i CONCURRENCE:
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N0: NR-126-D-101-G DATE-Jllt 161987 ATTACHMENT 1 f
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