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Determination of D{sub 2}O-2% Enriched Uranium Lattice Parameters by Means of a Critical System; Determination des Parametres d'un Reseau Uranium Enrichi a 2%-Eau Lourde au Moyen d'un Ensemble Critique; Opredelenie s pomoshch'yu kriticheskoj sistemy parametrov reshetki s 2%-nym obog ashcheniem Urana i s zamedlitelem D{sub 2}O; Determinacion, Mediante un Conjunto Critico, de los Parametros de un Reticulado de D{sub 2}O y Uranio Enriquecido al 2%

Conference:

Abstract

The paper describes a series of experiments performed to determine the basic parameters of a D{sub 2}O-2% enriched-uranium lattice. The fuel elements were hollow cylinders, canned in aluminium and wetted by heavy water both on the inside and outside. The experiments were performed on the RB critical assembly of the Boris Kidric Institute of Nuclear Sciences in Belgrade. The clean geometry of this system enables a rather simple theoretical interpretation of experimental results, and straightforward comparison with two-group diffusion-theory calculations. Measurements performed for ten different lattice configurations included determination of buckling, water-level reactivity coefficient and disadvantage factors for thermal-and epithermal-neutron flux inside a reactor cell. Techniques for these measurements are described. The experimental data are then used to derive the lattice parameters defined by the four-factor formula and two-group diffusion-theory treatment of the reactor core. The results are compared with the standard calculations of the same parameters for measured lattice configurations. Deviations are found in the value of n and resonance integral for U{sup 238}. In conclusion, an analysis is made of the usefulness and accuracy of information obtained from critical experiments for design and exploitation of a research reactor, composed of D{sub 2}O and enriched uranium. (author) [French] Les  More>>
Authors:
Raisic, N.; Takac, S.; Markovic, H.; Bosevski, T. [1] 
  1. Boris Kidric Institute of Nuclear Sciences, Belgrade, Yugoslavia (Serbia)
Publication Date:
Feb 15, 1964
Product Type:
Conference
Report Number:
IAEA-SM-42/4
Resource Relation:
Conference: Symposium on Exponential and Critical Experiments, Amsterdam (Netherlands), 2-6 Sep 1963; Other Information: 5 refs., 7 figs., 1 tab.; Related Information: In: Exponential and Critical Experiments Vol. II. Proceedings of the Symposium on Exponential and Critical Experiments| 494 p.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ALUMINIUM; BUCKLING; DISADVANTAGE FACTOR; EPITHERMAL NEUTRONS; EXPERIMENTAL DATA; HEAVY WATER; HOLLOW FUEL RODS; MULTIGROUP THEORY; NEUTRON DIFFUSION EQUATION; R-B REACTOR; REACTIVITY COEFFICIENTS; REACTOR CELLS; REACTOR CORES; REACTOR LATTICE PARAMETERS; RESONANCE INTEGRALS; SLIGHTLY ENRICHED URANIUM; THERMAL NEUTRONS; URANIUM 238
OSTI ID:
22122003
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M2695078114
Submitting Site:
INIS
Size:
page(s) 509-526
Announcement Date:
Aug 27, 2013

Conference:

Citation Formats

Raisic, N., Takac, S., Markovic, H., and Bosevski, T. Determination of D{sub 2}O-2% Enriched Uranium Lattice Parameters by Means of a Critical System; Determination des Parametres d'un Reseau Uranium Enrichi a 2%-Eau Lourde au Moyen d'un Ensemble Critique; Opredelenie s pomoshch'yu kriticheskoj sistemy parametrov reshetki s 2%-nym obog ashcheniem Urana i s zamedlitelem D{sub 2}O; Determinacion, Mediante un Conjunto Critico, de los Parametros de un Reticulado de D{sub 2}O y Uranio Enriquecido al 2%. IAEA: N. p., 1964. Web.
Raisic, N., Takac, S., Markovic, H., & Bosevski, T. Determination of D{sub 2}O-2% Enriched Uranium Lattice Parameters by Means of a Critical System; Determination des Parametres d'un Reseau Uranium Enrichi a 2%-Eau Lourde au Moyen d'un Ensemble Critique; Opredelenie s pomoshch'yu kriticheskoj sistemy parametrov reshetki s 2%-nym obog ashcheniem Urana i s zamedlitelem D{sub 2}O; Determinacion, Mediante un Conjunto Critico, de los Parametros de un Reticulado de D{sub 2}O y Uranio Enriquecido al 2%. IAEA.
Raisic, N., Takac, S., Markovic, H., and Bosevski, T. 1964. "Determination of D{sub 2}O-2% Enriched Uranium Lattice Parameters by Means of a Critical System; Determination des Parametres d'un Reseau Uranium Enrichi a 2%-Eau Lourde au Moyen d'un Ensemble Critique; Opredelenie s pomoshch'yu kriticheskoj sistemy parametrov reshetki s 2%-nym obog ashcheniem Urana i s zamedlitelem D{sub 2}O; Determinacion, Mediante un Conjunto Critico, de los Parametros de un Reticulado de D{sub 2}O y Uranio Enriquecido al 2%." IAEA.
@misc{etde_22122003,
title = {Determination of D{sub 2}O-2% Enriched Uranium Lattice Parameters by Means of a Critical System; Determination des Parametres d'un Reseau Uranium Enrichi a 2%-Eau Lourde au Moyen d'un Ensemble Critique; Opredelenie s pomoshch'yu kriticheskoj sistemy parametrov reshetki s 2%-nym obog ashcheniem Urana i s zamedlitelem D{sub 2}O; Determinacion, Mediante un Conjunto Critico, de los Parametros de un Reticulado de D{sub 2}O y Uranio Enriquecido al 2%}
author = {Raisic, N., Takac, S., Markovic, H., and Bosevski, T.}
abstractNote = {The paper describes a series of experiments performed to determine the basic parameters of a D{sub 2}O-2% enriched-uranium lattice. The fuel elements were hollow cylinders, canned in aluminium and wetted by heavy water both on the inside and outside. The experiments were performed on the RB critical assembly of the Boris Kidric Institute of Nuclear Sciences in Belgrade. The clean geometry of this system enables a rather simple theoretical interpretation of experimental results, and straightforward comparison with two-group diffusion-theory calculations. Measurements performed for ten different lattice configurations included determination of buckling, water-level reactivity coefficient and disadvantage factors for thermal-and epithermal-neutron flux inside a reactor cell. Techniques for these measurements are described. The experimental data are then used to derive the lattice parameters defined by the four-factor formula and two-group diffusion-theory treatment of the reactor core. The results are compared with the standard calculations of the same parameters for measured lattice configurations. Deviations are found in the value of n and resonance integral for U{sup 238}. In conclusion, an analysis is made of the usefulness and accuracy of information obtained from critical experiments for design and exploitation of a research reactor, composed of D{sub 2}O and enriched uranium. (author) [French] Les auteurs decrivent une serie d'experiences qu'ils ont faites pour determiner les parametres fondamentaux d'un reseau uranium enrichi a 2%-eau lourde. Les elements combustiblesetaient des cylindres creux, gaines d'aluminium et baignant'dans l'eau lourde, a l'interieur comme a l'exterieur. Ils se sont servis de l'assemblage critique RB de l'Institut Boris Kidric des sciences nucleaires a Belgrade. La geometrie de cet assemblage non empoisonne a permis d'interpreter le resultat experimental a l'aide d'une theorie assez simple et de le comparer directement aux calculs faits par la theorie de la diffusion a deux groupes. Les mesures, pour dix configurations de reseau differentes, comportaient la determination du laplacien, du coefficient du niveau d'eau et des facteurs de desavantage pour le flux de neutrons thermiques et epither- miques a l'interieur d'une cellule. Le memoire decrit les methodes de mesure. Les auteurs utilisent ensuite les donnees experimentales pour en deduire les parametres de reseau determines par le calcul du coeur du reacteur au moyen de la formule des quatre facteurs et dans une theorie de diffusion a deux groupes. Ils comparent ces resultats avec les calculs classiques des memes parametres pour des configurations de reseau ayant fait l'objet de mesures. Ils ont constate des ecarts dans la valeur de n et de l'integrale de resonance pour {sup 238}U. En conclusion, les auteurs analysent l'utilite et l'exactitude des informations recueillies a l'aide des montages critiques en vue de l'etude et de l'exploitation d'un reacteur de recherche a uranium enrichi et eau lourde. (author) [Spanish] En la memoria se describe una serie de experimentos efectuados con objeto de determinar los parametros basicos de un reticulado de D{sub 2}O y uranio enriquecido al 2% Los elementos combustibles consistian en cilindros huecos, revestidos de aluminio, con agua pesada en el interior y en el exterior. Los experimentos se realizaron en el conjunto critico RB del Instituto de Ciencias Nucleares 'Boris Kidric' (Belgrado). La geometria sencilla de este conjunto facilita la interpretacion teorica de los resultados experimentales, asi como la comparacion directa con calculos efectuados segun la teoria de difusion de dos grupos. Entre las mediciones efectuadas para diez configuraciones diferentes de reticulado, figuraban la determinacion del laplaciano, del coeficiente de reactividad del nivel de agua y de los factores de desventaja para un flujo de neutrones termico y epitermico dentro de una celda del reactor. En la memoria se describen las tecnicas utilizadas en las mediciones. Los datos experimentales sirvieron a continuacion para deducir los parametros del reticulado, dennidos por la formula de cuatro factores y el estudio matematico del cuerpo del reactor con arreglo a la teoria de difusion de dos grupos. Los resultados obtenidos se comparan con los valores corrientemente asignados a los mismos parametros para configuraciones de reticulados medidos. Se presentan las desviaciones halladas en el valor de n y en la integral de resonancia para el {sup 238}U. En conclusion, se analiza la utilidad y precision de los datos obtenidos con los experimentos criticos para la construccion y explotacion de un reactor de investigacion de D{sub 2}O y uranio enriquecido. (author) [Russian] Daetsja opisanie serii opytov, vypolnennyh s cel'ju opredelenija osnovnyh parametrov reshetki s 2%-nym obogashheniem urana i s zamedlitelem v vide D{sub 2}O. Toplivnye jelementy predstavljali soboj polye cilindry, pokrytye aljuminiem i smochennye kak snaruzhi, tak i iznutri vodoj. Opyty provodilis' na kriticheskoj sborke RB Instituta jadernyh nauk im. Boris Kidric v Belgrade. Udobooptekaemaja geometricheskaja forma jetoj sistemy daet vozmozhnost' sravnitel'no prosto teoreticheski ob'jasnit' rezul'taty opytov i provesti neposredstvennoe gotovoe sravnenie s raschetami dvuhgruppovoj teorii diffuzii. Izmerenija, vypolnennye dlja desjati razlichnyh konfiguracij reshetki, vkljuchali opredelenie laplasiana, kojefficienta reaktivnosti urovnja vody i blok-jeffekta dlja potoka teplovyh i nadteplovyh nejtronov vnutri kamery reaktora. Opisyvaetsja metodika ctih izmerenij. Dannye opytov ispol'zujutsja dlja vyvedenija parametrov reshetki, opredeljaemyh po formule chetyreh somnozhitelej i pri primenenii k aktivnoj zone reaktora dvuhgruppovoj teorii diffuzii. Rezul'taty sravnivajutsja so standartnymi raschetami teh zhe parametrov dlja izmerjaemyh konfiguracij reshetki. Otmechajutsja otklonenija v velichine p i rezonansnogo integrala U-238. V zakljuchenie provoditsja analiz poleznosti i tochnosti poluchennoj v re zul'tate provedenija kriticheskih jeksperimentov informacii dlja proektirovanija i jekspluatacii issledovatel'skogo reaktora ja obogashhennom urane s tjazhelovodnym zamedlitelem. (author)}
place = {IAEA}
year = {1964}
month = {Feb}
}