Especially the fast removal of Xe-135 is important, as this is a very strong neutron poison and makes reactor control more difficult if left in the reactor.
22.
Impurities could act as neutron poisons and prevent a nuclear reactor from working, but the uranium oxide that Fermi wanted for his experimental reactor contained unacceptably large amounts of impurities.
23.
Furthermore, the neutron poison content of the facility load is limited such that the reactor cannot be tripped by a significant reactivity change upon insertion and removal of the samples.
24.
PTP experiments containing neutron poison loads in excess of that described are discouraged because of their adverse effects on isotope production rates, fuel cycle length, and fuel element power distribution.
25.
These fission products are important to the operation of the reactor because some fission products contribute delayed neutrons that are useful for reactor control while others are neutron poisons that tend to inhibit the nuclear reaction.
26.
Like other lanthanides, many isotopes, especially isotopes with odd mass numbers and neutron-poor isotopes like 152 Eu, have high cross sections for neutron capture, often high enough to be neutron poisons.
27.
As the extra xenon-135 is transmuted to xenon-136, which is much less a neutron poison, within a few hours the reactor experiences a " xenon burnoff ( power ) transient ".
28.
The HEU feedstock can contain unwanted uranium isotopes : 236 U is a neutron poison; therefore the actual 235 U concentration in the LEU product must be raised accordingly to compensate for the presence of 236 U.
29.
Typically, control rods contain neutron poisons ( substances, for example boron or hafnium, that easily capture neutrons without producing any additional ones ) as a means of altering " k-effective ".
30.
Typical experiments contain a neutron poison load equivalent to that associated with 200 g of aluminum and 35 g of stainless steel distributed uniformly over a 20-in . ( 50.8-cm ) length.
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