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AbstractAbstract
[en] This report describes an investigation into the modelling approximations normally made when the LWR lattice code LWRWIMS is used for design calculations on assemblies containing burnable poison pins. Parameters investigated include energy group structure, intervals between calculations in MWd/te and spatial subdivision of the poison pins. An estimate is made of the effect of using pin-cell smearing with diffusion theory for the assembly geometry, instead of a more exact heterogeneous transport theory calculation. The influence on reactivity of the minor gadolinium isotopes 152, 154, 156, 158 and 160 in a poison pin dominated by the isotopes 155 and 157 is presented, and finally, recommendations on the use of LWRWIMS for this type of calculation are made. (author)
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Dec 1982; 23 p
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Report
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ABSORPTION, BURNABLE POISONS, COMPUTER CALCULATIONS, COMPUTERIZED SIMULATION, GADOLINIUM, GADOLINIUM 152, GADOLINIUM 154, GADOLINIUM 155, GADOLINIUM 156, GADOLINIUM 157, GADOLINIUM 158, GADOLINIUM 160, GEOMETRY, L CODES, NEUTRON TRANSPORT, POISONING, REACTIVITY, REACTOR LATTICES, WATER COOLED REACTORS
ALPHA DECAY RADIOISOTOPES, COMPUTER CODES, ELEMENTS, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, GADOLINIUM ISOTOPES, INTERMEDIATE MASS NUCLEI, ISOTOPES, MATERIALS, MATHEMATICS, METALS, NEUTRAL-PARTICLE TRANSPORT, NEUTRON ABSORBERS, NUCLEAR POISONS, NUCLEI, RADIATION TRANSPORT, RADIOISOTOPES, RARE EARTH NUCLEI, RARE EARTHS, REACTOR MATERIALS, REACTORS, SIMULATION, STABLE ISOTOPES, YEARS LIVING RADIOISOTOPES
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