ML20211L193
| ML20211L193 | |
| Person / Time | |
|---|---|
| Issue date: | 08/20/1997 |
| From: | Doug Broaddus, Michele Burgess NRC |
| To: | |
| Shared Package | |
| ML20211L173 | List: |
| References | |
| SSD, NUDOCS 9710100132 | |
| Download: ML20211L193 (12) | |
Text
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S DATE: August 20, 1997 PAGE 1 OF 9 DEVICE TYPE: Mortar Sight Unit MODEk1 M67 DISTRIBUTOR:
Department of The Army Director, Armament and Chemical Acquisition and Logistics Activity Rock Island, IL 61299-7630 MANUFACTURER:
Hughes Leitz Optical Technologies, Ltd.
328 Ellen Street Midland, Ontario, Canada LAR 2H2 SEALED SOURCE MODEL DESIGNATION:
Tritium source vials manufactured to Department of the Army part numbers 9356141, 9356170, 11729510-1, 11733736, 11733738, 11733744-1, and 11733744-2 (see limitations).
ISOTOPE:
MAXIMUM ACTIVITY:
Hydrogen-3 (Tritium) 5.79 curies (214.2 GBq)
(11729510-1, 2@ 0.05 Ci/1.85 GBq each)
(11733736, 1@ 1.0 Ci/37 GBq)
(11733738, 3@ 0.03 Ci/1.11 GBq each)
(11733744-1, 1@ 0.7 Ci/25.9 GBq)
(11733744-2, 2@ 1.0 Ci/37 GBq)
(9356141, 2@ 0.4 Ci/14.8 GBq each)
(9356170, 1@ 1.1 Ci/40.7 GBq)
LEAK TEST FRE.QUENCY:
Not Required PRINCIPAL USE:
(W) Self-Luminous Light Source CUSTOM DEVICE:
X YES NO CUSTOM USER:
U.S.
Department of Defense Principally the Department of The Army 9710100132 970822 PDR RC SSD PDR
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155 D-126-S DATE: August 20, 1997 PAGE 2 OF 9 DEVICE TYPS1 Mortar Sight Unit DESCRIPTIQH1 The Model M67 Mortar Sight Unit is a modified version of the M64 and M64A3 Mortar Sight Units.
The modifications included changing several of the light sources and their mounting, and modifications to the unit to allow its use on a 120 mm mortar and to make it more rugged due to the greater shock forces it will experience.
The M67 Sight Unit consists of an elbow telescope assembly (consisting of an eyepiece assembly, a reflecting prism assembly, and the sighting cell assembly), and a mount assembly containing four aiming scale assemblies.
The elbow telescope and each scale assembly contains one or more tritium light sources as shown in.
The light sources are manufactured by mb-microtec (Model 400 Series), or other approved supplier, according to the Army's specifications, and are secured in the assemblies by means of an epoxy adhesive.
In addition, each light source is provided protection from external damage by a molded plastic scale and/or metal enclosure.
Overall-dimensions of the elbow telescope are apprcximately 4.3" x 1.9" x4" (10.9cm x 4.8cm x 10.2cm) and of the mount are approximately 5" x 4.5" x 6.5" (12.7cm x 11.4cm x 16.5cm).
When assembled, the overall device measures about 5" x 4.5" x 8.9" (12.7cm x 11.4cm x 22.6cm).
The elbow telescope body is constructed from cast aluminum alloy.
The mount is constructed from cast aluminum alloy and stainless steel.
The telescope is secured to the mount by means of a stainless steel cylindrical holder and clamping wingnut.
In addition, accidental or unauthorized separation of the telescope from the mount is prevented by means of a mounting ring installed on the telescope with a set screw that requires a special tool for removal.
This mounting ring prevents the telescope from being witharawn from the cylindrical mount.
Each of the sighting scale assemblies are constructed from cast aluminum alloy into which one or two light sources (0.03-1.1 Ci each) are mounted and secured by an epoxy adhesive.
The light sources are intended to provide illumination of the aiming scales in low light conditions.
The scales are constructed from transparent molded plastic and are glued and screwed onto each assembly, covering the tritium light source.
The scales also provide additional protection for the light sources from external impact hazards.
The scales contain a total of 4.99 Ci tritium.
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S DATE: August 20, 1997 PAGE 3 OF 9 QEVICE TYPE: Mortar Sight Unit DESCRIPTION: (Cont'd)
The elbow telescope assembly contains two additional tritium light sources (0.4 Ci each) in the eyepiece to provide illumination of the aiming creas hairs in low light conditions.
These sources are secured in an aluminum assembly by means of an epoxy adhesive and an aluminum retaining ring.
This assembly is next inserted in the eyepiece and secured by means of an epoxy adhesive.
The eyepiece assembly is then inserted in the body of the telescope and secured with an epoxy adhesive.
The entire telescope assembly is sealed with a sealing compound to prevent the ingress of contaminants in the optical assemblies.
1
(
The fully assembled unit is mounted to the mortar by sliding the base plate of the mount assembly into a corresponding slot on the mortar barrel.
A spring actuated locking mechanism secures the baseplate in the slot on the mortar.
After firing the mortar, the locking mechanism is released by means of a lever on the mount body and the sight unit may then be removed.
The sight unit is stored in a padded, fiberglass or nylon carrying case when not in use.
The case protects the sight from incidental drops and impacts during transport from site to site, and reduces the exposure of the sight to humid and dirty environments.
DIAGRAM:
See attachments 1-3.
LABELING:
The M67 sight units contain several labels on the telescope assembly and the mount assembly.
The labels are made of adhesive backed metal foil, aluminum alloy or equivalent attached by screws, and adhesive backed decal material.
Lettering is stamped, engraved, or painted and coated with a finish material.
The information contained in the labeling on the telescope assembly includes the radiation trefoil symbol, isotope (H3),
activity (contained in the telescope assembly only), date of source vial manufacture, telescope serial number, the words
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S DATE: August 20, 1997 PAGE 4 OF 9 DEVICE TYPE: Mortar Sight Unit LABELING: (Cont'd)
" CAUTION-RADIOACTIVE MATERIAL," and a statement that the device, if found, should be returned to any military base.
The information contained in the labeling on the mount assembly includes the radiation trefoil symbol, isotope (H-3), activity (contained in the moant assembly only), date of source vial manufacture, mount serial number and date of manufacture, the words " CAUTION RADIOACTIVE VIALS, SCALES,... EXES" and " Sight Unit, M67," the NRC License Number, and a statement that the device, if found, should be returned to any military base.
l CONDITIONS OF NORMAL USE:
The sight unit is intended for use on 60 mm, 81 mm, and 120 mm mortar systems (principally 120 mm) in a towed or carrier configuration.
During firing of the mortar, the sight unit experiences extreme shock percussions and vibration.
When not in use and during transport, the sight unit is stowed in its case inside a vehicle.
During transport, the unit and case may experience extended vibration, drops from several feet, and a variety of impacts.
In addition, in the towed configuration, the mortar unit may tip over and fall on the sight unit.
The sight unit is designed to withstand repeated exposure to these conditions.
The optical components of the unit are likely to become unusable before damage to the tritium glass vials occurs.
The unit would be then be taken out of service.
As the sight unit requires a person for mounting and unmounting, the unit will always be used in environments suitable for human occupancy.
Typical use temperature range is -33*C to 71*C (-27 F to 160*F) with occasional extremes to -50 F (-46 C).
PROTOTYPE TESTING:
The M67 sight unit is essentially a modified M64A1 (a variation of the M64) sight unit.
Therefore, initially an M64A1 sight unit was modified to meet the design specifications of a M67 sight unit.
A prototype M67 was then constructed and both units were subjected to the following tests:
- Temperature (sight only)..........
65'C & -30 C, hold for 60 min. each.
i l
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S JATE: August 20, 1997 PAGE 5 OF 9 DEVICE TYPE: Mortar Sight Unit PROTOTYPE TESTING: (Cont'd)
- Thermal Shock (sight w/ case)...... 65*C for 15 min, to -30*C (immediate) for 5 min.
- Reduced pressure (sight w/ case)... Hold at 175 mm (6.89") Hg for four 15 min. periods.
- Impact (sight w/ case).............
Dropped 20 times from 1 m (3.28') and 2 times from 2m (6.56') in various orientations.
- Vibration (sight w/ case)..........
10 to 55 Hz in 1 min.;
0.075 cm (0.030")
amplitude; 0.15 cm (0.060") max. excursion.
- Immersion (sight w/ case)..........
0*C (32*F) bath for 15 min.; 65*C bath for 15 min., 5 cycles.
- Soak (sight only).................
Immerse in a water bath for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The above tests were conducted in accordance with an ANSI N540 test level of 6, with the exception of the immersion test temperature that was reduced to 65*C.
The custom user indicated the units would not normally encounter temperatures greater than this during use.
Each unit was also subjected to an additional temperature test as part of the acceptance testing for these devices.
Each unit was tested to a temperature range of -50*F to 160*F (-46 C to 71 C) and held at these temperatures for a minimum of four hours.
Following the additional temperature test each unit was tested for tritium leakage by a wire test, soak test, and a visual examination.
Both units remained functional following all of the above tests.
In addition, visual inspections of the tritium glass vial sources, swipe tests following each test, and the soak test water analysis indicated that the sources were undamaged.
The units were tested in their respective cases (first sight in a fiberglass case and second in a nylon case) for the Thermal Shock, Reduced pressure, Impact, Vibration, and Immersion tests since a unit would likely be in its case during incidences of these conditions (e.g.,
during transport).
During use of a unit, it is removed from its case and mounted on the mortar.
The custom user indicated that during these operations, a unit could be subjected to impacts (drops),
REGISTRY OF RADIOACTIVE SEALED SOURCES A D DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S DATE: August 20, 1997 PAGE 6 OF 9 DEVICE TYPE: Mortar Sight Unit PROTOTYPE TESTING: (Cont'd) temperature extremes, and exposure to wet environments (e.g.,
rain).
Therefore, the two units above were subjected to the Temperature and Soak tests without their cases.
A production model M67 sight unit was constructed and subjected to the additional temperature test described above and an additional impact and soak test, all without the case.
The additional impact test consisted of dropping the unit 20 times from a height of 1 meter in 10 different orientations selected to impart the most damage to the unit..The unit was slightly damaged during these drops, but the tritium vials showed no damage.
On the 21st drop, the height was increased to 2 meters (6.56') to simulate an accidental drop from the maximum height a unit would normally be subjected (during mounting or unniounting of the unit to tne mortar).
This drop caused a plastic scale to break off from the unit and expose one of the tritium source vials.
A visual examination of the unit and a swipe test indicated no damage to l
the source integrity or mounting.
A second drop was planned, but was not performed as the first 2 m drop exposed the cource vial to possible direct external damage.
It is expected that the device would be able to withstand a second 2 m impact without damage to the source vials.
-In addition, the custom user indicated that damage of the type indicated above would cause the unit to be taken out of service and repaired.
The production Model M67 was next subjected to the Soak test.
The results of this test also confirmed the tritium vials were undamaged.
The above test data indicates the device could be given an ANSI N540 classification of T6GC1333443.
In addition, three production Model M67 devices were aubjected to simulated and actual shock levels encountered during firing of the mortar.
The first and third units were subjected to 850 shocks at a simulated charge level of 4 (the highest level) and 2530 shocks at a simulated charge level of 3.
The second unit was subjected to 680 shocks at a simulated charge level of 4.
During testing, units 3 and 2 experienced damage to the elevation locking knob.
Unit 2 was damaged sufficiently to prevent additionm. testing.
Units 3 and 1 were modified (during testing) to prevent further damage to the elevation locking knobs, and were able to complete the full test.
The elevation locking knob assemblies were redesigned and units 1 and 3 were next tested to 500 shocke from live firings (125 at an actual charge level of 4 and 375 at an actual charge level of 3).
Units 1 and 3 were then l
F REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
HQ1 NR-0155-D-126-S DATE: August 20,.1997
-PAGE 7 OF 9 DEVICE TYPE: Mortar Sight Unit PROTOTYPE TESTING: (Cont'd) successfully; retested to the full 3380 simulated shocks.
No further damage to the units or light sources was noted.
Following each shock test, the tested unit was visually inspected ~
for-damage and. swipe tested for tritium leakage.
All tritium
- vial sources remained secured in the device, were undamaged, and were shown not to be leaking.
Two prototype M67 sight units were also subjected to a series of shock tests, including 1003 live firings at a charge level of 4.
The tritium source vials and their mounting were undamaged and determined to not be leaking following the tests.
The U.S. Army indicates Model M64 sight units have been in use on 60 mm-and 81 mm mortars since 1983 under conditions similar to those-expected for the M67 unit with no reported incidents of failure.ofL the source vials or containment due to the design of the! unit.
The similarity of the design and construction of the M67-sight unit.to the M64 sight unit indicates the units should
. perform similarly when used on 60 mm and'81 mm mortars.
EXTERNAL RADIATION LEVELS:
As the device contains.only tritium in glass vials, the external radiation' levels.from the device are not discernable from background.
- OUALITY ASSURANCE AND' CONTROL:
The U.S. Army-is responsible for the design, development, and production of the_M67 sight unit.
This is accomplished through
- U.S. - Army personnel, : contractors. and non-government: sub-cantractors.
The elements of-quality assurance and control (QA/QC) for the M67 are determined and prescribed by the U.S.
Army.- Each contractor and/or non-government sub-contractor must
.have a QA/QC program consistent with the requirements specified
~ : by the U.S. Army.
The manufacturer, Hughes-Leitz, has a QA/QC
- program for the manufacture and' production of the sight units and the-installation of:the tritium vials that has-been approved by the U.S. Army.
In addition the U.S. Army / contractor. performs incoming inspections and acceptance tests on completed sights i
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2-REGISTRY OF RADIOACTIVE. SEALED SOURCES-AND DEVICES-SAFETY EVALUATION OF DEVICE (AMENDED IN ITS ENTIRETY)
- HQ1 NR-0155-D-126-S DATE
- August 20, 1997 PAGE 8 OF 9 F
DEVICE TYPE: Mortar Sight Unit
/
1 2
OUALITY ASSURANCE ANS CONTROL: (cont'd) received from the manufacturer prior to releace for use.
These
+
1
-QA/QC programs have been deemed acceptable foc custom-licensing 3
of the M67 sight units, and copies of the programs are on file
- with the Source' Containment and Devices Branch.
i I
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
- The M67 sight-unit may be used only by the custom user as specified in this document.
- Handling, storage, use, transfer, and disposal:
To be determined by the licensing authority.-
Z
- The Model M67 sight unit may only conta'in tritium source vials manufactured.in accordance with Department of the Army-specifications as described in this document and that have been approved and-registered in-accordance with 10 CFR l
32.210 or equivalent Agreement' State regulation.
- The device shall not be subjected to conditions which would exceed an ANSI N540 classification of T6GC, with the exception of a temperature range of -50*F to_160*F (-46*C to l
71 C), and maximum shock levels as listed-in this certificate.
- Thia registration sheet and the information contained within the references.shall not be changed without the written E
consent of the NRC.
RAFETY-ANALYSIS
SUMMARY
Based on ourfreview of the Model M67 sight unit, the information and test data cited below, we conclude that these devices are facceptable:for custom-licensing purposes.
Furthermore, based on the prototype testing: performed on the M67 units, and that the M671 sight unit:is essentially similar-to the M64 sight unit that has been'used on-60 mm and 81 mm mortars-since 1983 with no reported incidents of failure of the glass vials or source containnent, we conclude the M67 sight unit would be expected to maintain its containment integrity for normal and accidental
4 1.
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY-' EVALUATION OF DEVICE
-(AMENDED IN ITS ENTIRETY)
LHQ;. NR-0155-D-126-S'-
DATE,_ August'20, 1997-PAGE 9 OF 9 i
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. DEVICE TYPE: Mortar Sight Unit v
.I conditions of use as specified in this certificate.
REFERENCES:
j.
The following supporting documents-for the Model M67 sight unit t
are hereby incorporated by reference-and are made a part of-this
-registry document.
j.
- ' Department of the Army letters dated March 13, 1996, February 12, 1996, December 22, 1995, December 13, 1995,
-November 2 2,- 1 9 9 5',_ November 16, 1995, and March 3,
- 1995, with enclosures thereto.
- Department of the Army facsimile receivedLMarch 21, 1996, with enclosures thereto e
ISSUING AGENCY:
U.S.~ Nuclear Regulatory Commission Date:
'Aucust 20, 1997
' Reviewer MMb _
Douglds A. Broaddus Date:
Aucust 20. 1997
- Concurrence:
M Michele L.
Burgess ~
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P/N ll733744 -l(l) 0.7 Ci TOTAL TRITIUM PER SIGHT UNIT 5.79 CURIES
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVIC 3 (AMENDED IN ITS ENTIRETY) h NR-0155-D-126-S DATE: August 20, 1997 ATTACHMENT 2 Ikn - w -, woi e yewa n
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