Power Plant Engineering (PPE) MCQs | Page - 4

 the candu is a canadian pressurized heavy water reactor design used to generate electric power. heavy water nuclear reactors and light water nuclear reactors differ in how they create and manage the complex physics of nuclear fission or

 the candu, for canada deuterium uranium, is a canadian pressurized heavy water reactor design used to generate electricity. the acronym refers to its deuterium oxide (heavy water) moderator and its use of (originally natural) uranium fuel.

 if the reactor produces more fissionable material than it consumes, it is fast breeder reactor. the breeder fuel consists of both fertile and fissile material. the number

 lmfbr stands for liquid

 the gcfbr stands for gas cooled fast breeder reactor; it is cooled by helium gas at 85bar. also helium doesn’t become radioactive under neutron bombardment and hence secondary coolant is not needed.

 using helium as coolant posses less severe metallurgical and safety problems. heat transfer coefficient of helium is much superior than sodium with artificial roughening of fuel rod surfaces. low doubling time as compared to sodium cooled reactors.

 organic substance cooled reactor uses enriched uranium as fuel and a mixture of orthometaterhenyl and paratherphenyl as coolant and moderator, and boron control rods, generating 11.4 mw capacities with an overall efficiency of 25%.

 some of the major factors to locate a nuclear station considered are, availability of cooling water, transportation facilities, distance from load centre, safety, radioactive waste, disposal facility and foundation requirement.

 geiger-muller counter is used to measure the rate of nuclear disintegration.

 fast breeder reactor may not need a moderator.