ML20154M016
| ML20154M016 | |
| Person / Time | |
|---|---|
| Issue date: | 10/16/1998 |
| From: | John Lubinski NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Seaman S SEAMAN NUCLEAR CORP. |
| References | |
| SSD, NUDOCS 9810200139 | |
| Download: ML20154M016 (10) | |
Text
pa ae49 g 't UNITED STATES g j e
NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001 o
% . . . . . ,o October 16, 1998 Scott Seaman, President Seaman Nuclear Corporation 7315 South First Street Oak Creek, WI 53154
Dear Mr. Seaman:
This letter is in response to your letters dated December 23,1997, December 30,1997, and October 8,1998, requesting amendment of device registry NR-587-D-104-F We are in the process of reviewing the application. However, in order to continue our review, we need the following information:
- 1. Please verify that the following information, provided in Seaman Nuclear Corporation's letters dated September 16,1998, July 31,1998, and June 1,1998, is applicable to the Models C-100 and C-200 gauges:
- a. The labeling for the Models C-100 and C-200 will be the same as specified in the above referenced letters for the Model C-300, when distributed to specific licensees. The only differences between the labeling of the C-100, C-200, and C-300, when distributed to specific licensees, would be the model number that is included on the labeling.
- b. The manufacture and distribution of the Models C-100 and C-200 will be in accordance with the quality assurance program submitted with the above referenced letters.
- c. The radiation levels around the Models C-100 and C-200 will not exceed those provided for the Model C-300 in the above referenced letters.
- d. It is expected that the Models C-100 and C-200 would be expected to survive the testing performed on the Model C-300, as specified in the above referenced letters, based on an engineering evaluation of the similarities and differences between the devices. /
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- 2. Please provide a copy of the users manuals for the Models C-100 and C-200. The manual should include notations similar to those included in the manual for the Model C-300.
- 3. Please verify that the information contained in the enclosed draft registration certificate is complete and accurate. If there are any discrepancies, please mark the changes directly on the certificate and retum the marked up certificate with your response to this letter.
9810200139 981016 r PDR RC
- L SSD PDR [
S. Seaman 3
- 4. Please provide complete engineering drawings for the Model C-100. The drawings should include the same level of detail provided in the drawings for the Models C-200 and C-300.
Please provide the requested information within thirty (30) days. If we do not receive the requested information within thirty (30) days of the date of this letter, we will consider your application as having been abandoned by you. This is without prejudice to the resubmission of a complete application. If you have any questions, please contact me at (301) 415-7868 or Mr. Steven Baggett at (301) 415-7273.
Sincerely, John W. Lubinski, Mechanical Engineer Materials Safety Branch Division of Industrial and Medical Nuclear Safety Office of Nuclear Material Safety and Safeguards
Enclosure:
Draft Registration Certificate NR-587-D-104-S j Distribution:
IMNS r/f SSD-98-02 SSD-98-05 NE01p SSD File # NR-587-D-104-S DOCUMENT NAME: C:\ FILES \SSDS\NR587104.DEF Ta receive a copy of this document, indicpte in the box: 'C" = Copy without attachment / enclosure 'E' = Copy with ettachment/ enclosure *N' = No ct,py OFFICE IMSB 4 4' l E. l NAME JLubinski/ji' l DATE ONNW1 g/c./js OFFICIAL RECORD COPY
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- REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES ,
SAFETY EVALUATION OF DEVICE DRAFT i NO.t NR-587-D-104-S DATE: -DRAFT PAGE 1 OF 7 DEVICE TYPE: Portable Moisture Density Gauge MODEL: C-100, C-200, C-300 2
MANUFACTURER / DISTRIBUTOR: Seaman Nuclear _ Corporation !
7315 South First Street i Oak. Creek, WI 53154 SEALED SOURCE MODEL DES 71 NATION:
For Models C-100. C-200, and C-300:
Amersham Models: AMN. PES, AMN.V997, CDC.800 Gammatron Models: 'AN-HP, GT-GHP Isotope Products Laboratory Model: HEG-137 For Models C-100 and C-200:
Amersham Models: CDC.804, CDC.805, AMN.6002, AMN.Q1954 ,
Du Pont Merck: NER-550 l 3M: 4P6M Nuclear Sources and Services: AN-HPG, AN-HP, GT-GHP ISOTOPE: MAXIMUM ACTIVITY: 1 Cesium-137 10 mci (370 MBq)
' Americium-241/ Beryllium 50 mci (1.85 GBq)
LEAK TEST FREOUENCY: 6 Months ;
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-PRINCIPAL USE: (G) Portable Moisture Density Gauges CUSTOM DEVICE: YES X NO ENCLOSURE l
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE DRAFT Nf_1 NR-587-D-104-S DATE: DRAFT PAGE 2 OF 7 DEVICE TYPE: Portable Moisture Density Gauge
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F j DESCRIPTION:
The Model C-300 is a portable single piece unit, approximately J
- 10" x 10" x 17" (25.4 x 25.4 x 43.2 cm) weighing about 37 pounds 1 (16.8 kg). It incorporates a 50 mci (1.85 GBq) 4 americium-241: beryllium sealed neutron source and an 10 mci (370 MBq) cesium-137 sealed gamma source enabling inspection of 1 i- materials for moisture content and density.
The cesium-137 source is housed in a lead shield within the !
device and_is. rotated 180a 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 90a will_ rotate l the source 180*. When the gauge is not in use, the source holder !
rests in the shielded position surrounded by lead.
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-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 accomplish this, the shielding mechanism is returned to the Off 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
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE DRAFT NO,: NR-587-D-104-S DATE: DRAFT PAGE 3 OF 7 l
DEVICE TYPE: Portable Moisture Density Gauge I DESCRIPTION (Cont.):
history of this type of gauge nor in the 35 years of Seaman ;
Nuclear products. The source holders must be heated to 600 F i (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 the life of the device. However, even if the epoxy were to fail, the sources would remain in the housing due to the design of the 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 instructions for how to lock the shutter mechanism when the top is removed.
The Models C-100 and C-200 are of similar design to the Model C-300. The only differences between the devices are overall dimensions, dimensions of some parts, and other minor differences internal to the device.
LABELING:
The device is labeled in accordance with 10 CFR 20.1901.
Specifically, a metal label is riveted to the front of the lower section of the device and includes the device model number, serial, isotopes, activities, dates of assay, the trefoil symbol, and the words " Caution - Radioactive Material." In addition, the device labeling identifies Seaman Nuclear.
When the top portion of the device (electronics) is removed, two labels are visible, one indicates how the user is to lock the handle / source in the closed position, and the other states "DO NOT DISASSEMBLE BEYOND THIS POINT."
The On and Off position of the cesium-137 source is indicated by 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.
DIAGRAM:
See attachment i r
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES I SAFETY EVALUATION OF DEVICE ;
DRAFT l NO.: NR-587-D-104-S DATE: DRAFT PAGE 4 OF 7 l DEVICE TYPE: Portable Moisture Density Gauge CONDITIONS OF NORMAL USE: '
The devices are designed for use under conventional field 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 I material up to 191*C-(376'F).
PROTOTYPE TESTING:
A prototype of the Model C-300 was subjected to and passed the following tests. Based on design similarities, it is expected that the Models C-100 and C-200 would withstand the same testing.
Cold Cycle: Eight hours at -12*C (10.4*F).
I Hot Cycle: Eight hours at 63 C (145'F). )
l Thermal Shock: Hot (63'C (145*F]) and cold (-12*C (10.4 F])
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 )
hour. Then, the device was subjected to the cold i 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 1 hot environment for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
l Hot __Sarigiel A 191'C (376*F) surface was established. The l device was placed on the surface for 20 minutes and then allowed to cool to ambient (20*C (68 F] ) .
The device was then cycled, 6 times, between the 191 C (376 F) surface for 5 minutes and an ambient ;
surface for 5 minutes. l Vibration: Device was fastened to a vibratory test fixture 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 amplitude was 0.125" (0.3 cm) in one two i directions and 0.018" (0.46 mm) in the other 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 1' (30.5 cm) .
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE DRAFT NO.: NR-587-D-104-S DATE: DRAFT PAGE 5 OF 7 DEVICE TYPE: Portable Moisture Density Gauge EXTERNAL RADIATION LEVELS:
The following table includes the maximum combined gamma and neutron dose rates for a Model C-300, containing 10 millicuries of cesium-137 and 50 millicuires of americium-241/ beryllium, including the location and gauge mode. Dose rates for the Models C-100 and C-200 would be lower than those listed in the table:
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 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 I
Air Gap 35.7 2.9 0.6 Left Shielded 2.7 0.9 0.2 Touchable 2.8 0.7 0.2 Untouchable 3.1 0.7 0.2 Air. Gap 3.6 0.9 0.2 Top Shielded 6.1 1.4 0.2 !
Touchable 2.0 0.5 0.2 j Untouchable 2.0 0.6 0.2 Air Gap 2.0 0.7 0.2 Top of Shielded 36.6 3.3 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 Touchable
- 25.5 2.9 Untouchable
- 25.5 2.9 Air Gap
- 25.5 2.9 Values are mrem /hr
- In beam rate on contact was not measured.
4 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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l REGISTRY.OF RADIOACTIVE SEALED SOURCES AND DEVICES '
SAFETY EVALUATION OF DEVICE DRAFT NO.: NR-587-D-104-S DATE: DRAFT PAGE 6 OF 7 ;
DEVICE TYPE: Portable Moisture Density Gauge OUALITY ASSURANCE AND CONTROL:
Seaman Nucl' ear 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.
. LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
- The devices shall be distributed to specific licensees of the NRC or Agreement States.
- The device shall be-leak tested at intervals not to exceed 6 months using techniques capable of detecting 0.005 microcurie (185 Bq) of removable contamination.
- Handling, storage, use,. transfer, and disposal: To be determined by the licensing authority.
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- This registration sheet and the information contained within I the references shall not be changed without the written q consent of the NRC. '
SAFETY ANALYSIS
SUMMARY
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Based on review of the Models C-100, C-200, and C-300 and the information and test data cited b'elow, we conclude that the devices are acceptable for licensing. purposes.
Furthermore, we conclude that the devices would be expected to maintain their 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 l'
SAFETY EVALUATION OF DEVICE DRAFT NO.: NR-587-D-104-S DATE: DRAFT PAGE 7 OF 7 DEVICE TYPE: Portable Moisture Density Gauge
REFERENCES:
The following documents for the Models C-100, C-200, and C-300 portable moisture density gauges are hereby incorporated by reference and are made a part of this registration certificate:
- Seaman Nuclear Corporation's letters dated October 8, 1998, September 16,- 1998, July 31, 1998, June 1, 1998, December 30, 1997, and December 23, 1997, with enclosures thereto.
ISSUING AGENCY:
U.S. Nuclear Regulatory Commission Date: Reviewer: XXXXXXXXXXX1XXXX John W. Lubinski Datei Concurrence: XXXXXXXXXXXXXX Steven L. Baggett i
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE DRAFT NO.- NR-587-D-104-S DATE: DRAFT ATTACHMENT 1 l
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Position of I ! l Labeling l a [j C Models C-100, C-200, and C-300 i
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