ML20151Y458
| ML20151Y458 | |
| Person / Time | |
|---|---|
| Issue date: | 09/17/1998 |
| From: | Steven Baggett, John Lubinski NRC |
| To: | |
| Shared Package | |
| ML20151Y439 | List: |
| References | |
| SSD, NUDOCS 9809180245 | |
| Download: ML20151Y458 (8) | |
Text
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!'i REGISTRY-OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF. DEVICE NO.: NR-587-D-104-S DATE:.sEP 171996 PAGE 1 OF 7 DEVICE TYPE:
Portable Moisture Density Gauge MODEL:
C-300 MANUFACTURER / DISTRIBUTOR:
Seaman Nuclear Corporation 7315 South First' Street Oak Creek, WI 53154 SEALED SOURCE MODEL DESIGNATION:
Amersham Models: AMN. PES, AMN.V997, CDC.800 Gammatron Models: AN-HP, GT-GHP Isotope Products Laboratory Model: HEG-137 ISOTOPE:
MAXIMUM ACTIVITY:
Cesium-137 10 mci (370 MBq).
Americium-241/ Beryllium 50 mci (1.85 GBq)
LEAK TEST FREOUENCY:
6 Months PRINCIPAL USE:
(G) Portable Moisture Density Gauges CUSTOM DEVICE:
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REGISTRY OF-RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO,: NR-587-D-104-S DATE: AEP 17166 PAGE 2 OF 7
. DEVICE TYPE:
Portable Moisture Density Gauge DESCRIPTION:
The Model C-300 is a portable single piece unit, approximately 10" x 10" x 17" (25.4 x 25.4 x 43.2 cm) weighing about 37 pounds (16.8 kg).
It incorporates a 50 mci (1.85 GBq) americium-241: beryllium sealed neutron source and an 10 mci (370 MBq) cesium-137 sealed gamma source enabling inspection of materials for moisture content and density.
The cesium-137 source is housed in a lead shield within the device and is rotated 180* between its on and Off position.
The source remains in the device at all times.
The lead shield for
'the cesium-137 source is held to the base of the meter with four
. stainless steel studs and tamper resistant nuts.
For additional strength, a plate is fastened with screws to the top of the shield and to the flange of the base.
The on-off mechanism, whose status is indicated by the position of the carrying handle, moves the cesium-137 source holder within its stationary shield inside the gauge.
The on-Off mechanism incorporates a 2 to 1 gear ratio which means that turning the handle 90* will rotate
.l the source 180'.
When the gauge is not in use, the source holder l
i rests in the shielded position arrounded by lead.
There is no shutter for the americium-241: beryllium source.
The americium-241: beryllium source is fixed and shielded in all directions except straight down.
In the optional direct transmission mode, the source remains protected in the instrument housing and only the' detector is placed in a probe external to the gauge.
The'C-300 is designed so that the source positioning mechanism must be in the Off position for the gauge to be transported.
To accomplich this, the shielding mechanism is returned to the off I
I condition by lifting the handle from either of its two operating positions.
Approximately 3 foot-pounds of torque is required to overcome the positioning detent in the On condition.
Lifting the gauge by its handle, which is horizontal in the on condition,,
applies 27 foot-pounds of torque.
Lifting of the gauge by the handle will return the gauge to the off condition.
Epoxy is used to retain the sources within their holders.
This epoxy is insoluble in water and most common solvents.
Seaman has indicated there have been no. epoxy failures in either the 20 year i
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l REGISTRY'OF RADIOACTIVE SEALED SOURCES-AND DEVICES
)
SAFETY EVALUATION OF DEVICE' I
i NO.: NR-587-D-104-S DATE: ggp 17 VM PAGE 3 OF 7 DEVICE TYPE:
Portable Moisture Density Gauge i
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DESCRIPTION (Cont.):
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history of this type of gauge nor in the 35 years of Seaman i
l' Nuclear products.
The source holders must be heated to 600 F l
(316*C), a temperature that melts the lead in the source holder,.
to release the source.
Seaman has demonstrated that the epoxy-will, withstand exposure to radiation experienced during the11ife l
of the device.
However, even if the epoxy were to fail, the L
sources would remain in the~ housing due to the design of the l
l shielding for the cesium-137 and americium-241: beryllium
- The top half of the device (electronic portion).is removable.
However, a plate, held in place by tamper-resistant hardware,
. restricts assess to the lower half of the unit.
A label on this plate indicates that the plate should not be removed and provides l
instructions for how to lock the shutter mechanism when the top is removed.
L L-LABELING:
i i
The device is labeled in accordance with 10 CFR 20.1901..
j Specifically, a metal label is riveted to the front of the lower l
section of the device.and includes the device model number, serial, isotopes, activities, dates of assay, the trefoil symbol, i
and the words " Caution - Radioactive Material."
In addition, the i
l device labeling. identifies Seaman. Nuclear.
L
' When'the top portion of the device (electronics) in removed, two 3
labels are visible, one indicates how the user is to lock the E
handle / source in the closed position, and the other states "DO l-NOT DISASSEMBLE BEYOND THIS POINT."
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The on and off position of the cesium-137 source is indicated by 1
- the position of the handle.
There are figures next to the device read out that indicate the source condition based on the position l
of the handle.
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DIAGRAM:
I See attachment 1
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVAI.UATION OF' DEVICE l
NO.: NR-587-D-104-S DATE: $&P 17 933 PAGE 4 OF 7 i
DEVICE TYPE:
Portable Moisture Density Gauge CONDITIONS OF NORMAL USE:
The devices are designed for use under conventional field l
construction and testing conditions, including environmental ranges from 0 to 100% relative humidity, ambient temperatures
-20 to 60*C (-4 to 140*F), and with the. base in contact with l
material up to 191'C (376'F).
PROTOTYPE TESTING:
A prototype of the device was subjected to the following tests:
Cold Cvele:
Eight hours at -12 C (10 4 F).
i Hot Cvele:
Eight hours at 63*C (145*F).
Thermal Shock:-Hot (63*C [145oF]) and cold (-12*C [10.4 F])
s environments were established.
The device'was subjected to the hot environment'for 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and then transferred to the cold environment for 1 I
hour.
Then, the device was subjected to the cold environment for 4-hour and then transferred to the hot environment for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
Hot Surface:
A 191*C (376'F) surface was established.
The device was placed on the surface for 20 minutes and then allowed to cool to ambient (20'C [68'F] ).
l The device was then cycled, 6 times, between the r
191*C (376'F) surf ace for 5 minutes and an ambient
]
surface for 5 minutes t
J
. Vibration:
Device was fastened to a vibratory test fixture
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for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The frequency was 12.5 Hz and the 1
amplitude was 0.125" (0.3 cm) in one two j
directions and 0.018" (0.46 mm) in the other j
direction.
The device was rotated after 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
Droo Test:
Dropped onto an asphalt surface from 1 m (3.3').
Also dropped 5 times onto a 1" (2.54 cm) diameter steel ball from a height of l' (30.5 cm).
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l REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-587-D-104-S DATE: ggp 171993 PAGE 5 OF 7 I
DEVICE TYPE:
Portable Moisture Density Gauge FXTERNAL RADIATION LEVELS:
i The following table includes the maximum combined gamma and neutron dose rates including the location and gauge mode:
Distance Side Gauge Mode Contact 30 cm (0.98')
1m (3.3')
Front Shielded 10.1 1.7 0.4 Touchable 16.4 1.9 0.6 Untouchable 17.5 2.2 0.5 l
Air Gap 71.0 2.6 0.7 Back Shielded 11.8 1.8 0.3 Touchable 17.8 2.4 0.3 Untouchable 20.1 2.5 0.4 Air Gap 75.9 2.8 0.5 Right Shielded 17.1 1.6 0.3 Touchable 24.1 2.6 0.5 Untouchable 24.1 2.8 0.5 Air Gap 35.7 2.9 0.6 Left Shielded 2.7 0.9 0.2 Touchable 2.8 0.7 0.2 l
Untouchable 3.1 0.7 0.2 i
Air Gap 3.6 0.9 0.2 Top Shielded 6.1 1.4 0.2 Touchable 2.0 0.5 0.2 Untouchable 2.0 0.6 0.2 Air Gap 2.0 0.7 0.2 Top of Shielded 36.6 33 0.3 Base Touchable 7.3 1.7 0.2 Untouchable 7.6 1.7 0.2 Air Gap 6.3 1.8 0.3 Bottom Shielded 16.1 2.3 0.5 l
Touchable 25.5 2.9 l
Untouchable 25.5 2.9 25.5 2.9 Air Gap Values are mrem /hr
- In beam rate on contact was not measured.
Shielded - gauge in off condition.
Touchable - gauge is resting on surface of a concrete block.
Untouchable - gauge is raised approximately 0.2" (0.5 cm) above surface.
Air Gap - gauge is raised approximately 2" (5.1 cm) above surface.
Top of Base - top of the lower half, electronic portion is removed.
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION-OF DEVICE s
NO,: NR-587-D-104-S DATE: JEP 17 $93 PAGE 6 OF 7 DEVICE TYPE:
Portable Moisture Density Gauge OUALITY ASSURANCE AND CONTROL:
Seaman Nuclear Corporation maintains a quality assurance and control program which has been' deemed acceptable for licensing purposes by NRC.
A copy of the program is on file with NRC.
L LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
- -The Model C-300 shall be distributed to specific licensees of the NRC or Agreement States.
- The device shall be leak tested at intervals not to exceed l
6 months using techniques capable of detecting l
0.005 microcurie (185.Bq) of removable contamination.
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- Handling, storage, use, transfer, and disposal: as required by 10 CFR 31.5 or Agreement State equivalent.
- This registration sheet and the information contained within l
the references shall not be changed without the written consent of the NRC.
SAFETY ANALYSIS
SUMMARY
Based on review of the Model C-300 and the information and' test
. data cited below, we conclude that the device is acceptable for licensing-purposes.
Furthermore, we conclude that the Model C-300 would be expected to maintain its integrity for normal conditions of use and accidental conditions which might occur during uses specified in this certificate.
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REGISTRY OF' RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO,_1 NR-587-D-104-S DATE: SEp I y gg PAGE 7 OF 7 l
DEVICE TYPE:
Portable Moisture Density Gauge j
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REFERENCES:
The following documents.for the Model C-300 portable moisture density. gauge are hereby incorporated by reference and are made a-part of this registration certificate:
L
-* Seaman Nuclear Corporation's. letters dated September 16, l
1998, July 31, 1998, June 1, 1998, December 30, 1997, and December 23, 1997, with enclosures thereto.
l ISSUING AGENCY:
U.S. Nuclear Regulatory Commission LDate:
IEP 17 I00 Reviewer:
Iv J
W Lupinski
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Date:
SIP 1 I IIII Concurrence:
@.- W #~
' Steven L. Baggett 4
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE N_O,J. NR-587-D-104-S DATE:
SEP 17.1998 ATTACHMENT 1 Q
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