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capable of or possessing a nucleus or nuclei capable of undergoing fission: a fissionable nucleus; fissionable material.

hirseled or hirselled also hirsled; hirseled or hirselled also hirsled; hirseling or hirselling also hirsling; hirsels also hirsles. Definition of hirsel (Entry 3 of 3) intransitive verb. 1 Scottish : to move along a surface awkwardly : slither. 2 Scottish : to move clumsily or with difficulty : scramble.

The principal fissile materials are uranium-235 (0.7 percent of naturally occurring uranium), plutonium-239, and uranium-233, the last two being artificially produced from the fertile materials uranium-238 and thorium-232, respectively.

3. What is the most attractive part of nuclear energy? Explanation: Most attractive part of nuclear energy is that it has no combustion products and under safe working conditions contributes no pollutant to air.

Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam. The steam is directly used to drive a turbine, after which it is cooled in a condenser and converted back to liquid water. This water is then returned to the reactor core, completing the loop.

A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.

• A fissile material is one that will undergo fission when bombarded by neutrons of any energy. The isotope uranium-235 is a fissile material. A fertile material is one that will capture a neutron, and transmute by radioactive decay into a fissile material.

• The key difference between fissile and fertile isotopes is that fissile isotopes are material that can undergo fission reaction, whereas a fertile isotope is a material that can be converted into a fissile isotope. Moreover, fissile isotopes can undergo fission reactions directly, while fertile isotopes cannot undergo fission directly.

• A power reactor contains both fissile and fertile materials. The fertile materials partially replace fissile materials that are destroyed by fission, thus permitting the reactor to run longer before the amount of fissile material decreases to the point where criticality is no longer manageable.

A fissile material is one that will undergo fission when bombarded by neutrons of any energy. The isotope uranium-235 is a fissile material. A fertile material is one that will capture a neutron, and transmute by radioactive decay into a fissile material.

The key difference between fissile and fertile isotopes is that fissile isotopes are material that can undergo fission reaction, whereas a fertile isotope is a material that can be converted into a fissile isotope. Moreover, fissile isotopes can undergo fission reactions directly, while fertile isotopes cannot undergo fission directly.

Fissionable materials include also those (such as uranium-238) that can be fissioned only with high-energy neutrons. As a result, fissile materials (such as uranium-235) are a subset of fissionable materials.

Fertile material consist of isotopes that are not fissionable by thermal neutrons, but can be converted into fissile isotopes (after neutron absorption and subsequent nuclear decay). Typical fertile materials: 238U, 232Th.