ML20217A310
| ML20217A310 | |
| Person / Time | |
|---|---|
| Issue date: | 02/13/1981 |
| From: | Singer B, Wright E NRC |
| To: | |
| Shared Package | |
| ML20217A285 | List: |
| References | |
| SSD, NUDOCS 9804220230 | |
| Download: ML20217A310 (6) | |
Text
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REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.:
NR267S101S DATE:
February 13, 1981 PAGE 1 0F 6 SEALED SOURCE TYPE:
Smoke Detector Source I
t10 DEL: AMX-1100 Foil MANUFACTURER / DISTRIBUTOR:
EAD Metallurgical, Inc.
71 Pearce Avenue l
Tonawanda, NY 14150 i
MANUFACTURER / DISTRIBUTOR:
ISOTOPE:
Americium-241 MAXIMUM ACTIVITY: '250 microcuries/cm2
~
LEAK TEST FREQUENCY:
N PRINCIPAL USE:
Ion Generators, Smoke Detectors CUST0f1 SOURCE:
YES X NO 9804220230 980415
~
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REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.: NR267S101S DATE:
February 13, 1981 PAGE 2 0F 6 SEALED SOURCE TYPE:
Smoke Detector Source DESCRIPTION:
The Model AMX-1100 sealed source consists of americium oxide unifornly distributed and sintered in a pure gold matrix which is further contained between a backing of
"" gold coated pure silver and a front covering of gold electroplated with rhodium and fabricated by hot forging methods.
The continuously welded metal layers are rolled so that the minimum thickness of the layers are:
Rhodium................
0.0005 mm f l e '7 M,a u s Gold................... 0.001 mm 3 cf,9
- r., %,
Americium oxide........ 0.0005 m Gold...................
0.0005 mm Silver substrate....... 0.2 mm
- 7. 8x p) n.am g
Subdivision of the rolled foil is accomplished by cutting or punching into discs of 2-10 mm diameter or rectangular-strips of say 3-10 mm per side.
At the activity
/ loading specified above, there is no loose contamination above the wipe test limit of 0.005 microcuries (see Figure 1).
0 g # Mounted foil sources of the AMX-2100 series consists of AMX-1100 foil d
' 1tr ed 0,gg, a
to 6 m diameter) and various brass or stainless steel holders.
Brass; holders.are ei.ther tin or nickel plated.
The two basic types of holders enployed are brass or
,,p '. stainless steel cup-like holders and brass or stainless steel plate-like holders.
~
fA" a, n pu,.r i
D' In the cup-like holders, the foil dise (usually !fnm diamet
) is seated in a l
Ch030" deep cup and the surrounding walls are machine cri ed over the disc's
/ edge.
In a second cup-like holder a thin portion (0.015" of the wall above the
/
foil seat is pushed slightly down and inward with a forming tool narrowing the
. 16W opening and positively locking the foil discs.
In a separate operation, the outer
' walls are' flanged outward to provide positive locking of the holder to the plate.
i In plate-like holders, sources are placed into a shallow 0.005#re. /zb p
cess created in L
one plate. A second plate is positioned over the source.
This cover plate has l
ears protruding through the first plate which are folded over, thereby pressing and f
locking the source'in its seat.
In a second plate-like holder two plates have two holes through which rivets are placed and are impact riveted together.
The flodel AMX-1100 may be mounted in the following holders:
A11X-2101, Af tX-2102, AMX-2103, AMX-2104, AMX-2105, AMX-2106 1, AMX-2107-1, AMX-2112-1, AMX-2122-2, AMX-2132-1, AMX-2142-2, AMX-2152-2, and AMX-2162-1.
l t
i
y REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE fl0. :
NR267S101S DATE:
February 13, 1981 PAGE 3 0F 6 SEALED SOURCE TYPE:
Smoke Detector Source LABELING:
Neither the foils nor mounts are labeled.
DI AGRAt4:
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PEGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE N0.:
NR267S101S DATE:
February 13, 1981 PAGE 4 0F 6 SEALED SOURCE TYPE:
Smoke Detector Source CONDITIONS OF NORfiAL USE:
Both mounted and unmounted foils are designed for use in either residential or industrial smoke detectors for use at ambient tenperatures and pressure.
PROTOTYPE TESTING:
Prototype Model AMX-1100 blanked sealed sources have been tested to conditions described by ANSI Standard N5.10-1968 and classification of C52222 has been demonstrated.
Results of wipe tests of the tested foils were acceptable to less than 0.005 microcuries.
Model AMX-1100 foils have experienced the following additional tests;
,141 1.
Immersion in water of prototype foils for 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> at 50 C:
less than 0.001 microcurie per foil loaded at 62 microcuries/cm2 of foil was found in the water.
z. z. 9 g t ej 2.
Immersion of 0.1 N hydrochloric acid for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at room temperature:
less than 0.003 microcurie per microcurie activity was leached out.
j i
3.
Saliva was applied for one hour, foils were washed and wiped:
less than 0.0005 microcurie / microcurie was removed in the wash water and wipe.
4.
Foils were subjected to tests in sulfur dioxide and hydrogen sulfide, less than 0.005 microcurie wipable contamination was found.
Al1X 2100 Series mounted foils have experienced the following additional tests:
1.
Vibration tested at 1700 vibrations per minute in three axis with 0.75" amplitude for a period of three hours.
No mounted source suffered any 1
mechanical deformation and/or foil source was ejected from its holders.
Foils j
were wiped and removable activity did not exceed 0.1 nanocuries.
'10' by W H1h # 2 weightof20lbs/.viduallypositionedonasteelblock3"x5"x1"anda 2.
Sources were ind was flat impact surface of 3" x 3" was allowed to drop onto each source from five feet. The mounted sources were subjected to impact both on their side as well as their front.
No foil discs were ejected from its seat in the mounting and wipe tests in all cases did not exceed 1.2 nanocuries.
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REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.:
NR2675101S DATE:
Februa ry 13, 1981 PAGE 5 0F 6 i
i SEALED SOURCE TYPE:
Smoke Detector Source PROTOTYPE TESTING (CONT'D):
Prototype sources were subjected by the manufacturer to high temperature tests of 1200*C. Test results show that the worst case release from any source did not exceed 0.1 percent of the original source content.
Thus the tested sources would
{
be expected to maintain containment integrity under high temperature conditions likely to occur in storage, transportation or use.
EXTERNAL RADIATION LEVELS:
EAD reports the following dose rates from unshielded foils:
at 1 cm.............. 0.75 mr/hr per microcuri e at 5 cm.............. 0.13 mr/hr per microcurie at 15 cms............ 0.012 mr/hr per mic rocurie QUALITY ASSURANCE AND CONTROL:
All of the Model AMX-1100 sources are checked by gamma counting to ensure that the activity in each foil is within specified limits.
Each source is wipe tested to an c ceptance limi.t of 0.005 microcuries.
In' addition to the above, each Model AMX-1100 foil is checked by alpha spectrometry to determine the adequacy of the gold cover.
Manufactured lots of mounted foil sources are subjected to visual inspection (AQL 0.65), radioactivity content (AOL 0.65), ion current (AOL 1.5), and removable activity test, i.e., wipe test (AQL 1.5).
Wipe test filter paper specimens test limit for removable activity is 0.1 nanocurie.
LIMITATIONS AND/0R OTHER CONSIDERATIONS OF USE:
]
A.
Source and source holder combinations shall be distributed only to specific licensees of NRC or Agreement States.
B.
Conditions for handlino and use of the foil source are to be determined by the licensing authority; sources should not be handled with the bare hands, i
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g REGISTRY OF RADI0 ACTIVE SEALE0 SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE N0.:
NR267S101S DATE:
February 13, 1981 PAGE 6 0F 6 SEALED SOURCE TYPE:
Smoke Detector Source SAFETY ANALYSIS
SUMMARY
Based on our review of the information and test data contained in the correspondence cited below, we conclude that EAD Metallurgical Model AMX-1100 foil and the AMX-2100 series foil mountings (see specific models listed) are acceptable for licensing purposes.
Our conclusions are based on prototype test data which shows the ability of the foil source and source plus mounting to withstand environmental and other factors to which they may be subjected when used in residential and industrial type smoke detectors.
REFERENCES:
This Certificate of Registration is based on information and test data provided by EAD Metallurgical, Inc., in which their letters and enclosures thereto dated June 1, 23, 1977; July 19, 1977; August 31, 1977; September 8, 15, 30, 1977; October 6, 1977 November 10, 1977, April 21, 1980 and December 19, 1980.
Date February 13, 1981 Reviewed By
/s/
Earl G. Wright
)
Date February 13, 1981 Concurrence
/s/
Bernard Singer
)
ISSUING AGENCY:
U.S. Nuclear Regulatory Commission