ML20217Q744
| ML20217Q744 | |
| Person / Time | |
|---|---|
| Issue date: | 02/05/1991 |
| From: | Steven Baggett NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Munro J RTS TECHNOLOGY, INC. |
| Shared Package | |
| ML20216B833 | List: |
| References | |
| SSD, NUDOCS 9804130137 | |
| Download: ML20217Q744 (2) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION n
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ly WASHINGTON, D. C. 20555 Fra 0 51991 John Munro III Managing Director RTS Technology Inc.
35 Flagship Drive North Andover, MA 01845
Dear Mr. Munro:
This refers to your March 2, 1990 and January 9, 1991 letters requesting a safety evaluation of the Model 424 source changer. We have identified the following areas that need clarification or additional information.
t 1. The photograph shows what appears to be four source assembly openings, and the drawings show only two. Please explain the difference.
s2.' How are the holddown caps attached?
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'3; Please provide a' diagram,o.rdescripkiononhowtheguidetubeis connected to the latching assembly.
l V 4. The locking components appear to be constructed of carbon steel. What routine maintenance and inspection does RTS perform, if needed. We are concerned that rust could develop and interfere with the locking mechanism?
/ 5. What is the total weight of the source changer
- 6. How is the' source changer coverplate held in place?
7. How is the label attached to the device and what is the materials of construction? c p,
- 8. Provide the results of the kink and bend tests performed on the guide tube to demonstrate compliance with 10 Part 34. Further indicate how the component will be marked so that it can be identified as an RTS guide tube that meets the 10 CFR Part 34 requirements.
1 g,9; Please note that Amersham has modified the design of the Model 660 exposure device to meet the 10 CFR Part 34 equipment requirements.
Will the guide tube RTS supplies with the source changer be compatible with Amersham modified design? iAdditionally, will the Model 702 source assembly be compatible with the modified 660 exposure device locking l
mechanism? '
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- 10. We appreciate your use of recommendations in the operating manual to promote compliance with NRC regulations.
Please consider adding the recent requirement that an alarming rate meter must be worn and advise the user not to service or maintenance the source changer lock
. mechanism without special authorization.
We will continue our evaluation of the source changer upon receipt of the above information.
Sincerely, even
.B Leader j
Sealed Source Safety Section Medical, Academic, and Commercial Use Safety Branch Division of Industrial and Medical Nuclear Safety i
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RTS TECHNOLOGY, INC.
A Company of the Sauerwein Group 23 April 1991 RTS TECHNOLOGY,INC.
35 Flagship Drive Mr. Stephen Baggett, Section Leader North Andover, MA 01845 Sealed Source Safety Section Telephone 508-683-5211 Medical, Academic & Commercial Use Safety Branch befax 508-683-9469 Division of Fuel Cycle, Medical, Academic & Commercial Use Safety U~ S Nuclear Regulatory Commission Washington,DC 20555 Dcar Mr. Baggett, We are writing in response to your letter of 5 February 1991 regarding our application of 2 March 1990 requesting safety evaluation and registration of j
our Model 424 Source Changer.
The photograph which was presented in the application was a photograph of an earlier prototype version of this source changer which had for channels.
It was subsequently decided to revise this design to the current, two channel configuration. The structural configuration of these two versions were the same. However, we have subsequently resubmitted the source changer in its current configuration to the conditions of the free drop and penetration tests.
A copy of this report is included.
The hold down caps are attached to the cover plate of the latching assembly by means of the 1/2 - 20 UNF threads on the bottom of the hold down cap and the cover plate of the latching assembly.
The guide tube is connected to the latching assembly by means of the control connector. The guide tube is attached to the control connector by means of the threaded plug on the end of the control connector. The emergent control pins on the control connector depress the latch pins in the latching assembly, which allows the latching slide to move to the open position. With the latching slide in the open position, it engages the control connector, and secures it to the latching assembly. A drawing of this control connector is enclosed.
The latching base is fabricated from brass. All other components of the latching assembly are fabricated from stainless steel. Consequently, corrosion will not cause interference with the operation of the latching assembly.
The total weight of the source changer is 51 pounds.
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O RTS TECHNOLOGY, INC. l A Company of the Sauerwein Group The source changer cover is held in place by treans of four 1/4-20 UNC screws which are secured through the cover to the deck plate of the source changer.
Two labels are attached to the device. One labelis manufactured from 0.031 inch (0.8 mm) thick stainless steel and is embossed with the radiation caution symbol and the words " Caution, Radioactive Material". The second I
labelis manufactured from 0.031 inch (0.8 mm) thick stainless steel or brass and contains the name of the manufacturer, the model number, the serial number, the radionuclide and the capacity of the container. Both labels are attached by means of steel pop rivets.
It is intended that the source guide tube used with the source changer is the same source guide tube used with the exposure device. No special source guide tube will be provided with the source changer. The user's guide tube would be attached to the control connector by means of the threaded plug on the end of the control connector. Consequently, there will be no issue of compatibility of the source guide tube to the modified Amersham Model 660.
Although Amersham Corp. has modified the Model 660,it is our understanding that there has been no modification to the source assembly.
Consequently, our Mode 1702 source assembly will remain compatible to j
both the original and modified Model 660s.
We have modified our operating instructions to include the use of an alarming rate meter and to provide a caution about servicing the source changer latching mechanism as you have recommended. This revised manualis enclosed.
We trust that this response is satisfactory. Your prompt review would be greatly appreciated. If we can provide any additionalinformation, please contact us.
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Sincerely, i
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l Joh J. Junro III M6naging Director i
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RTS TECHNOLOGY, INC. h A Company of the Sauerv,en Group RTS TECHNOLOGY, INC.
35 Flagship Drive North Andover, MA 01845 Telephone 508-683 5211 Telefax 508 683 9469 TEST REPORT By:
JohnJ Muntoil Alfonso De51mone Date:
23 April 199I Suhlect:
Type a rrae Drop and Penetretion T9sts of Model 424 Source Changer Inp following test! ymonstrate that the Model 424 Source Changer satisfies the free drop and penetration require.ments for Type A Packages as described in 49 CFR 173 463 and 10 CFR 71 71 free Drop A prototype Modal 424 Source Changer was subjected to a free drop from a height of 1.2 meters
( 48 Inches). The t3rget for this drop was a flat steel slab,32 millimeters ( 1.25 inches) thick.
The package was dropped tw1ce, in two attitudes. In the first drop, the container impacted the target on its top surface with the cylindrical axis perpendicular to the target surface. In the second drop, the container impacted the target on its side surface with the cylindrical axis parallel to the target surface. As a result of these two drops, there was some minor cosmetic damage to the package However, there was no reduction of the structural integrity of the package.
Penetration A prototype Model 424 Source Changer was subjected to the penetration test. A steel billet, with a mass of 6 8 Lg ( 15 pounds) was dropped from a height of I meter (40 inches) onto the package.
The billet was dropped twice, in two areas of the package. In the first drop, the bill 6t impacted the cantainer on its top plate in the second drop, the biliet impacted the container on its side surface As a rxult of these two drops, there was s0me minor cosmetic damage t0 the package.
Hoy ever, there w33 no reduction of the structural integrity of the package.
As a result of this analysis, it is concluded that the Model 424 Source Changer satisfies the free drop and penetr9 tion requirements for Type A packages
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59201 Fitting Notes:
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Meteriel shell be stainless Steel RTS TECHNOLOGY, INC.
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- 2. Finish shall be 63 miercinch A Company of the Sauerwein Group
- 3. Unless otherwise specified, tolerances shell be-.
Control
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RTS TECHNOLOGY, INC. h A Company of the Sauerwein Group RTS TECHNOLOGY, INC.
35 Flagship Drive North Andover, MA 01845 Telephone 508-6n5211 Telefax 508 683 4 469 RTS Technology, Inc. Model 424 Radiographic Source Changer Operation Manual Technical Data:
Size.
Height 250 mm 10 inches Diameter 150 mm 6 inches Weight 23 kg (51 pounds)
Shielding ( Urarnum) 18kg (39 pounds)
Capacity (Ir 192) 240 Curies Transport Status:
Type A Package Within Overpack, Type B(U) USA /6717/B(U)
Source Assembly:
RTS Technolog/, Inc. Model 702 General The Model 424 is designed for use as a radiographic source changer, storage container and transport packege for the indicated source assembly.
The US Nucleer Regulatory Commission allows the use of these source changers Only by persons who are specifically authorized under the terms of their license. Application for a ifcense to use this device should be made to the eppropriate regional office of the US Nuclear Regulatory Commission.
Prior to the first shipment of these source changers, the user, in addition, should register with:
Transportation Certification Branch Office of Nuclear Material Safety and Safeguards US Nuclear Regulatory Commission Weshington,DC 20555 Cautlon:
The user of this source changer should not perform service or j
maintenance on the source changer latching assembly or lock mechanism without the expressed prior epproval of the manufacturer.
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RTS TECHNOLOGY, INC. b A Company of the Sauerwein Group Receipt i
Upon receipt of the source cnanger, survey the source changer to assure that the radiation levels do not exceed 200 mR/hr at the surface nor 10 mR/hr et one meter from the surface.
2.
Check the source changer for obvious damage.
3.
Check the packing list and shipping papers to assure that al items are intact and are representative of the shipment.
4.
Place the exposure device In a restricted area until read / to use.
Operation NOTE. Personnel using this source changer must have a calibrated and operable survey instrument with a range of et least 0- 1000 mR/hr. In addition, personnel monitoring devices must be worn during these operations. A direct reaalng pocket dosimeter and either a film badge or a thermoluminescent dostmeter should be used. US Nuclear Regulatory Commission regulations also require the operator to wear an alarm ratemeter which is set to give en alarm signal at a preset dose rate of 500 mR/hr.
Radiographic source changes must be conducted in a restricted area and the area must be posted es required in 10 CFR 20.
1.
Ustng a calibrated and operable survey instrument, remove the source changer from storege. Survey the source chenger on all sides to assure that the radiation levels do not exceed 200 mR/hr at the surface nor 10 mR/hr at one meter from the surface. If the radiation levels exceeC either of these limits, notify the Radiation Safety Officer.
2 Inspect the radiooraphic exposure device and associated oquipment in accordance with the cperating procedures for that device Inspect the source changer for any signs of damage. Inspect j
the guide tube connector for proper condition.
3.
Determine the distance to the boundarles of the High Radiation Area and Restricted Area.
Establish the boundsry of the Restricted Area and post the boundaries of both erees.
4 Connect the guide tube connector to the guide tube of the radiographic exposure device.
5.
Install the guide tube connector over the empty chamber of the source changer. Assure that the guide tube Is layed out es stralght as possible.
6.
Nove the latching slide to the OPEN position to secure the guide tube connector to the source changer
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Following the operating procedures for the radiographic exposure device, transfer the source assembly from the exposure device to the source changer. Approach the exposure device with the survey instrument and survey the device on all sides. The radiation level should be substantially less that that measured in step 1, since the exposure device no longer contains the source Survey the entire length of the guide tube (s). As the survey instrument is moved closer to the source changer, the radiation levels should increase Survey the surface of the source changer to essure that the radiation level does not exceed 200 mR/hr. If any unusual radiation levels are observed, treat the situation es an emergency and notify the Radiation Safety Officer.
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v RTS TECHNOLOGY, INC. b A Company of the Sauerwein Group 8-Move the latching slide from the OPEN position to the CLOSED position, lock the latching siide end withdraw the guide tube connector from the source changer. Disconnect the drive cable from the source assembly.
1 9
Attach the drive caDie to th6 new source assembly. Install the gut (D tube connector Over the chamber of the source changer. Mcve the latching slide to the OPEN position to secure the guide tube connector to the source changer.
10 Folluwing the operating procedures for the radiographic exposure oevice, tr 9sfer the source assembly from the source changer to the exposure device. Approach the expose e device with the survey Instr ument and survey the device on all sides. The radiat10n level shuld be i
similar to that that measured in step 1, depending upon the reletive activities of the sources. The radietton level should not exceed 200 mR/hr. Survey the entire length of the guide tube (s). As the survey instrument is moved eway from the exposure device, the radiition level should decrease. As the survey instrument is moved closer to the source cnanger, the radiation levels should increase. Survey the surface of the source changer to essure that the rediation level does not exceed 200 mR/hr. If eny unusual radiation levels are observed, treat the situation es an emergency $nd notify the Radicilon Safety Office 11.
Pemcve tbc guide tube of the radiograchic exposure device from the guide tube connector.
12.
Assure that the source changer is lockod Install the source changer cover in place.
Shipment I
Assure that the company designated to receive the radioactive material is authorized to possess it.
2.
Assure that the source is secured in the proper shleided storage position in the package.
3.
Attach a security seal with an identification mark to the package closure.
4.
Survey the exterior surfaces of the shipping package to assure that the radiation level does not exceed 200 mR/hr. Survey one meter form the exterior surfeces from the package to assure that the radiation levels do not exceed 10 mR/hr. Determina tM proper shipping labels to be applied using the criter!a of Table 1.
5 Properly complete two shipping labels indiuting the contents (iridium i 92), the activity of the source in curtes and the transport index. The transport index is the dimensionless number (rounded up to the f!rtt decimal place) expressing the maximum radiation level (in mR/hr) measured at One meter from the package 6
Assure that any old shipping labels have been removed from the package. Apply two properly completed labels to two opposite sides of the package.
7 Mark the outside of the package with the proper shipping name end identification number
( Radioective Mater!al, Special Form, n,0 s., UN2974, R0) If not alreaW marked Mark the outside of the package with the proper Type B number (USA /6717/B(U))if not alrea@ marked.
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Properly complete the shipping paper s, indicating:
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Proper shipping name end identification number (i e. Radioactive Meterial, Special Form, n.o.s., UN2974. RO) b Name of the radionuclide(iridium 192) l c,
Activity of the source, in curies d.
Category of Label Applied (i.e. Rauicactive Yellow II) e irensport Index f.
USNRC fdentification Number (i.e USA /6717/B(U))
g Shipper's Certification:
"This is to certify that the above named materials are properly clessified, descr 1 bed, packaged, marked and labeled end are in proper condition for transport t
according to the applicable regulations of the Department of Trensportation."
For air shipments, the following shipper's certification may be used:
"I hereby certify that the contents of this consignment are fully and accurately described above by proper shipping name and are classified, oscked, merked and labeled and are in proper condition for carriage by air eccording to applicable national i
governmental regulations."
for air shipments, the packege must be labeled with the " CARGO AIRCRAFT ONLY" label and the shipping papers must state "THIS SHIPMENT IS WITHIN THE LIMITATIONS PRESCRIBED FOR CARG0-ONLY AIRCRAFT."
A notice must be enclosed in or on the package, included with the pecking list or otherwise forwerded with the package. This notice must include the name of the consignor
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or consignee and the statement: "THIS PACKAGE CONFORMS TO THE CONDITIONS AND
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LIMITATIONS SPECIFIED IN 49CFR I 73.424 FOR EXCEPTED RADI0 ACTIVE MATERIAL, ARTICLES MANUFACTURED FROM DEPLETED URANIUM, UN 2909"
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