Current through Register Vol. 49, No. 13, September 23, 2024
Subpart
1.
Applicability.
Sealed sources installed after July 1, 1993, must meet the
performance criteria of subparts 2 to 4.
Subp. 2.
General requirements.
Sealed sources must:
A. have a certificate of registration issued
by the NRC under Code of Federal Regulations, title 10, section 32.210, or by
an agreement state;
B. be doubly
encapsulated; and
C. use
radioactive material that is as nondispersible as practical and that is as
insoluble as practical if the source is used in a wet-source-storage or
wet-source-change irradiator.
Subp.
3.
Irradiator pools.
If sealed sources are to be used in irradiator pools, the
sealed sources must be encapsulated in a material resistant to general
corrosion and to localized corrosion, such as 316L stainless steel or other
material with equivalent resistance.
Subp. 4.
Required leak testing.
In prototype testing of a sealed source, the sealed source
must have been leak tested and found leak-free after each of the following
tests:
A. temperature test. The test
source must be held at -40 degrees Celsius for 20 minutes, 600 degrees Celsius
for one hour, and then subjected to a thermal shock test with a temperature
drop from 600 degrees Celsius to 20 degrees Celsius within 15
seconds;
B. pressure test. The test
source must be twice subjected for at least five minutes to an external
pressure (absolute) of 2,000,000 newtons per square meter;
C. impact test. A two-kilogram steel weight,
2.5 centimeters in diameter, must be dropped from a height of one meter onto
the test source;
D. vibration test.
The test source must be subjected three times for ten minutes each to
vibrations sweeping from 25 hertz to 500 hertz with a peak amplitude of five
times the acceleration of gravity. The test source must be vibrated for 30
minutes at each resonant frequency found;
E. puncture test. A 50-gram weight and pin,
0.3-centimeter pin diameter, must be dropped from a height of one meter onto
the test source; and
F. bend test.
If the length of the source is more than 15 times larger than the minimum
cross-sectional dimension, the test source must be subjected to a force of
2,000 newtons at its center equidistant from two support cylinders, the
distance between which is ten times the minimum cross-sectional dimension of
the source.
Statutory Authority: MS s
144.1202;
144.1203
