Published March 1962
| Version v1
Book
The sensitivity of calculated critical masses of small fast systems to changes in the U236 and U238 neutron-scattering data
Description
The sensitivity of the calculated critical masses of a number of simple systems, to changes in the basic neutron scattering data, have been investigated. The systems considered are spheres of 29% U235 and 93.5% U235, both bare, and reflected by thick natural uranium. The calculations have been carried out using the Carlson Sn method with 4 energy groups, and the percentage changes in the calculated critical masses of the different systems, due to specified changes in the various aspects of the neutron scattering data, have been obtained. The results are presented and discussed with particular reference to the adjustment of the basic data to give good agreement with experimental critical sizes. The basic data on which these calculations have been based are those given in AWRE Report 0-28/60. (author)
Abstract (French)
L'auteur a etudie, pour plusieurs modeles simples, quelle etait la sensibilite des masses critiques calculees aux modifications des donnees fondamentales relatives a la diffusion des neutrons. Les systemes consideres sont deux spheres d'uranium enrichi a 30% et a 94%, respectivement, tantot nues, tantot entourees d'un reflecteur epais en uranium naturel. Pour faire les calculs, l'auteur a utilise la methode Sn de Carlson avec quatre groupes d'energie; il a obtenu ainsi les variations en pourcentages des masses critiques calculees pour les differents modeles en fonction de modifications determinees des differentes donnees relatives a la diffusion. L'auteur presente les resultats et les examine en insistant particulierement sur le probleme que pose l'ajustement des donnees de base necessaire pour obtenir un bon accord entre les dimensions critiques calculees et celles qui sont determinees par l'experience. Les donnees de base d'apres lesquelles ces calculs ont ete etablis sont celles qui figurent dans le rapport 0-28/60 de l'Atomic Weapons Research Establishment. (author)Abstract (Spanish)
El autor ha estudiado la sensibilidad de las masas criticas, calculadas para varios sistemas sencillos, a los cambios de los datos basicos relativos a la dispersion neutronica. Los sistemas estudiados consisten en esferas de uranio enriquecido al 29 por ciento y al 93,5 por ciento, respectivamente, en el isotopo 235, desnudas o provistas de un grueso reflector de uranio natural. Los calculos se han realizado por el metodo Sn de Carlson, referido a cuatro grupos energeticos, obteniendose asi las variaciones porcentuales de las masas criticas en funcion de las modificaciones de los diversos datos relativos a la dispersion neutronica. El autor presenta y examina los resultados, insistiendo particularmente en la adaptacion de los datos basicos necesarios para lograr una concordancia satisfactoria con las dimensiones criticas calculadas y determinadas experimentalmente. En los calculos se emplearon los datos basicos que figuran en el informe 0-28/60 del Atomic Weapons Research Establishment. (author)Abstract (Russian)
Izuchalas' chuvstvitel'nost' vychislennykh kriticheskikh mass ryada prostykh sistem k izmeneniyam v osnovnykh dannykh rasseyaniya nejtronov. Izuchavshiesya sistemy predstavlyayut soboj sfery urana-235 s 30% obogashcheniem i urana-235 s 94% obogashcheniem kak bez ehkranirovaniya, tak i s otrazhatelem iz tonkogo sloya prirodnogo urana. Pri vychisleniyakh primenyaetsya metod Karlsona Sn s 4 ehnergeticheskimi gruppami i byli polucheny protsentnye izmeneniya v vychislennykh kriticheskikh massakh razlichnykh sistem, vyzyvaemye zadannymi izmeneniyami v nekotorykh dannykh rasseyaniya nejtronov. V doklade dayutsya i obsuzhdayutsya rezul'taty, prichem osoboe vnimanie pridaetsya privedeniyu osnovnykh dannykh v sootvetstvie s ehksperimental'no ustanovlennymi kriticheskimi razmerami. Osnovnye dannye, na kotorykh byli osnovany ehti vychisleniya, vzyaty iz doklada AWRE 0-28/60. (author)Additional details
Additional titles
- Original title (English)
- Influence de la precision des donnees relatives a la diffusion des neutrons par
Publishing Information
- Publisher
- Globus, Druck- und Verlagsanstalt, Vienna
- Imprint Place
- Vienna (International Atomic Energy Agency (IAEA))
- Imprint Title
- Physics of Fast and Intermediate Reactors. Vol. II. Proceedings of the Seminar on the Physics of Fast and Intermediate Reactors. Vol. II.
- Imprint Pagination
- 418 p.
- Series
- Proceedings Series
- Journal Page Range
- p. 97-110
- ISSN
- 0074-1884
Conference
- Title
- Seminar on Physics of Fast and Intermediate Reactors
- Dates
- 3-11 Aug 1961
- Place
- Vienna (Austria)
INIS
- Country of Publication
- International Atomic Energy Agency (IAEA)
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 44039340
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; S11: NUCLEAR FUEL CYCLE AND FUEL MATERIALS;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CRITICAL MASS; CRITICAL SIZE; FAST REACTORS; INTERMEDIATE REACTORS; MULTIGROUP THEORY; NATURAL URANIUM; NEUTRON DIFFRACTION; NEUTRON REFLECTORS; NUMERICAL ANALYSIS; SPHERICAL HARMONICS METHOD; URANIUM 235; URANIUM 236; URANIUM 238
- Descriptors DEC
- ACTINIDE NUCLEI; ACTINIDES; ALPHA DECAY RADIOISOTOPES; APPROXIMATIONS; CALCULATION METHODS; COHERENT SCATTERING; DIFFRACTION; ELEMENTS; EPITHERMAL REACTORS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MASS; MATHEMATICS; METALS; MINUTES LIVING RADIOISOTOPES; NEUTRON TRANSPORT THEORY; NUCLEI; RADIOISOTOPES; REACTORS; SCATTERING; SIZE; SPONTANEOUS FISSION RADIOISOTOPES; TRANSPORT THEORY; URANIUM; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- 9 refs, 3 figs, 7 tabs Imprint:In three volumes
- Secondary number(s)
- STI/PUB--49(V.2); IAEA-SM--18