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Pulsed-Source Experiments with Multiplying and Non-Multiplying Heavy Water Systems; Experiences a l'Aide de Sources Pulsees sur des Systemes Multiplicateurs et Non Multiplicateurs a Eau Lourde; Ehksperimenty s pul'siruyushchim istochnikom na nerazmnozhayushchikh i razmnozhayushchikh ustrojstvakh s tyazheloj vodoj; Experimentos con Fuentes Pulsadas en Sistemas de Agua Pesada Multiplicadores y No Multiplicadores

Abstract

An extensive series of measurements with a pulsed source of the {sup 3}T(d, n)He{sup 4} type has been performed at the subcritical facility MINOR of the Swiss Federal Institute for Reactor Research, Wuerenlingen. Three types of experiments were carried out to measure: (a) Decay constants of prompt neutron modes in natural and slightly enriched lattices; (b) Subcritical reactivity by means of the prompt decay and delayed neutron tails in natural and slightly enriched lattices; (c) Anisotropy of the thermal diffusion constant in D{sub 2}O containing different numbers of parallel empty tubes of various size. The time-dependent thermal neutron flux was measured in each system at different axial positions to obtain decay constants of the prompt modes for different axial bucklings (Fourier analysis) without changing the actual height of the D{sub 2}O level. The experimental values were compared with theoretical two-group parameters. Limitations of the technique are discussed. In addition, reactivity in highly subcritical systems with p {>=} -40$ was measured directly by utilizing the delayed neutron tail of the pulses. Results are compared with static measurements and show rather good agreement. (author) [French] Une longue serie de mesures a l'aide d'une source puisee du type {sup 3}T(d,n){sup 4}He a ete  More>>
Authors:
Utzinger, E.; Heer, W.; Lutz, H. R. [1] 
  1. Swiss Federal Institute for Reactor Research, Wuerenlingen (Switzerland)
Publication Date:
Oct 15, 1965
Product Type:
Conference
Report Number:
IAEA-SM-62/92
Resource Relation:
Conference: Symposium on Pulsed Neutron Research, Karlsruhe (Germany), 10-14 May 1965; Other Information: 10 refs., 7 tabs., 7 figs.; Related Information: In: Pulsed Neutron Research. Vol. II. Proceedings of the Symposium on Pulsed Neutron Research| 934 p.
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ANISOTROPY; BUCKLING; CRITICAL SIZE; DELAYED NEUTRONS; DEUTERON REACTIONS; FOURIER ANALYSIS; HEAVY WATER; HELIUM 4; NEUTRON FLUX; NEUTRON SOURCES; PROMPT NEUTRONS; PULSED NEUTRON TECHNIQUES; REACTIVITY; THERMAL DIFFUSION; THERMAL NEUTRONS; TIME DEPENDENCE
OSTI ID:
22123002
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M2610078804
Submitting Site:
INIS
Size:
page(s) 119-136
Announcement Date:
Aug 30, 2013

Citation Formats

Utzinger, E., Heer, W., and Lutz, H. R. Pulsed-Source Experiments with Multiplying and Non-Multiplying Heavy Water Systems; Experiences a l'Aide de Sources Pulsees sur des Systemes Multiplicateurs et Non Multiplicateurs a Eau Lourde; Ehksperimenty s pul'siruyushchim istochnikom na nerazmnozhayushchikh i razmnozhayushchikh ustrojstvakh s tyazheloj vodoj; Experimentos con Fuentes Pulsadas en Sistemas de Agua Pesada Multiplicadores y No Multiplicadores. IAEA: N. p., 1965. Web.
Utzinger, E., Heer, W., & Lutz, H. R. Pulsed-Source Experiments with Multiplying and Non-Multiplying Heavy Water Systems; Experiences a l'Aide de Sources Pulsees sur des Systemes Multiplicateurs et Non Multiplicateurs a Eau Lourde; Ehksperimenty s pul'siruyushchim istochnikom na nerazmnozhayushchikh i razmnozhayushchikh ustrojstvakh s tyazheloj vodoj; Experimentos con Fuentes Pulsadas en Sistemas de Agua Pesada Multiplicadores y No Multiplicadores. IAEA.
Utzinger, E., Heer, W., and Lutz, H. R. 1965. "Pulsed-Source Experiments with Multiplying and Non-Multiplying Heavy Water Systems; Experiences a l'Aide de Sources Pulsees sur des Systemes Multiplicateurs et Non Multiplicateurs a Eau Lourde; Ehksperimenty s pul'siruyushchim istochnikom na nerazmnozhayushchikh i razmnozhayushchikh ustrojstvakh s tyazheloj vodoj; Experimentos con Fuentes Pulsadas en Sistemas de Agua Pesada Multiplicadores y No Multiplicadores." IAEA.
@misc{etde_22123002,
title = {Pulsed-Source Experiments with Multiplying and Non-Multiplying Heavy Water Systems; Experiences a l'Aide de Sources Pulsees sur des Systemes Multiplicateurs et Non Multiplicateurs a Eau Lourde; Ehksperimenty s pul'siruyushchim istochnikom na nerazmnozhayushchikh i razmnozhayushchikh ustrojstvakh s tyazheloj vodoj; Experimentos con Fuentes Pulsadas en Sistemas de Agua Pesada Multiplicadores y No Multiplicadores}
author = {Utzinger, E., Heer, W., and Lutz, H. R.}
abstractNote = {An extensive series of measurements with a pulsed source of the {sup 3}T(d, n)He{sup 4} type has been performed at the subcritical facility MINOR of the Swiss Federal Institute for Reactor Research, Wuerenlingen. Three types of experiments were carried out to measure: (a) Decay constants of prompt neutron modes in natural and slightly enriched lattices; (b) Subcritical reactivity by means of the prompt decay and delayed neutron tails in natural and slightly enriched lattices; (c) Anisotropy of the thermal diffusion constant in D{sub 2}O containing different numbers of parallel empty tubes of various size. The time-dependent thermal neutron flux was measured in each system at different axial positions to obtain decay constants of the prompt modes for different axial bucklings (Fourier analysis) without changing the actual height of the D{sub 2}O level. The experimental values were compared with theoretical two-group parameters. Limitations of the technique are discussed. In addition, reactivity in highly subcritical systems with p {>=} -40$ was measured directly by utilizing the delayed neutron tail of the pulses. Results are compared with static measurements and show rather good agreement. (author) [French] Une longue serie de mesures a l'aide d'une source puisee du type {sup 3}T(d,n){sup 4}He a ete faite avec l'assemblage sous-critique MINOR de l'Institut federal suisse de recherches nucleaires, a Wuerenlingen. Il s'agissait d'experiences de trois types visant a mesurer les caracteristiques suivantes: a) Les constantes de decroissance des modes de neutrons instantanes dans des reseaux a uranium naturel et des reseaux a uranium faiblement enrichi; b) La reactivite sous-critique au moyen de la decroissance des neutrons instantanes et de la queue des bouffees constituee par des neutrons retardes, dans des reseaux naturels et des resaux faiblement enrichis; c) L'anisotropie de la constante de diffusion des neutrons thermiques dans D{sub 2}O contenant des tubes vides paralleles de diverse dimension, en nombres differents. Les auteurs ont mesure le flux de neutrons thermiques variable dans le temps pour chaque systeme a differentes positions axiales en vue d'obtenir les constantes de decroissance des modes de neutrons instantanes pour differents laplaciens axiaux (analyse de Fourier) sans modifier la hauteur du niveau de D{sub 2}O. Ils ont compare les valeurs experimentales avec les parametres obtenus a l'aide d'une theorie a deux groupes. Ils discutent les limitations de la technique. En outre, ils ont mesure directement la reactivite dans des systemes fortement sous-critiques ou p Greater-Than-Or-Equal-To -40$ en utilisant la queue des bouffees constituee par des neutrons retardes. Enfin, ils comparent les resultats avec ceux de mesures statiques et montrent qu'ils sont en assez bon accord. (author) [Spanish] Los autores utilizaron la instalacion subcritica ' MINOR' del Eidgenoessisches Institut fuer Reaktorforschung de Wuerenlingen para una larga serie de mediciones con una fuente de neutrones pulsados utilizando la reaccion {sup 3}T(d, n){sup 4}He. Llevaron a cabo tres clases de experimentos a fin de medir: 1. Las constantes de decrecimiento de los modos correspondientes a los neutrones instantaneos en reticulados de uranio natural y ligeramente enriquecido. 2. La reactividad en el estado subcritico, partiendo del decrecimiento de los neutrones instantaneos y de los datos proporcionados por las 'colas' de neutrones retardados en reticulados de uranio natural y ligeramente enriquecido. 3. La anisotropia de la constante de difusion termica en D{sub 2}O previa introduccion de un numero variable de tubos paralelos de diversos tamaflos. Se midio el flujo de neutrones termicos en funcion del tiempo en cada uno de los sistemas con distintas posiciones del eje, a fin de obtener las constantes de decrecimiento de los modos de los neutrones instantaneos para distintos laplacianos axiales (analisis de Fourier) sin modificar el nivel real del D{sub 2}O. Los autores comparan los valores experimentales con los parametros de la teoria dedos grupos y examinan seguidamente las limitaciones de esta tecnica. Ademas, midieron directamente, utilizando los datos proporcionados por la 'cola' de neutrones retardados de los impulsos, los valores de la reactividad en sistemas acusadamente subcriticos con p Greater-Than-Or-Equal-To -40 dolares. Estos resultados concuerdan satisfactoriamente con los de las mediciones estaticas. (author) [Russian] Na podkriticheskom ustrojstve MINOR Shvejcarskogo federal'nogo instituta po reaktornym issledovanijam v Wuerenlingen osushhestvlena shirokaja programma izmerenij pri pomoshhi pul'sirujushhego istochnika tipa {sup 3}T(d,n){sup 4}He. Provedeny tri kategorii jeksperimentov dlja izmerenija: a) konstant raspada mgnovennyh nejtronov v estestvennyh i slegka obogashhennyh re- shetkah; b) urovnja reaktivnosti v podkriticheskom sostojanii pri pomoshhi raspada mgnovennyh nejtronov i hvostov zamedlennyh nejtronov v estestvennyh i slegka obogashhennyh reshetkah; i v) anizotropii diffuzionnoj konstanty teplovyh nejtronov v tjazheloj vode s pogruzhen- nym v nee raznym kolichestvom parallel'no raspolozhennyh pustyh trubok raznyh razmerov. Dlja kazhdogo ustrojstva potok teplovyh nejtronov, zavisjashhij ot vremeni, izmerjali v razlichnyh polozhenijah po vysote dlja poluchenija konstant raspada mgnovennyh nejtronov dlja razlichnyh osevyh laplasianov (analiz Fur'e) bez izmenenija vysoty dejstvitel'nogo urovnja tjazheloj vody. Jeksperimental'nye znachenija sravnivajutsja s teoreticheskimi dvu- gruppovymi parametrami. Obsuzhdajutsja nedostatki jetogo metoda. 'dopolnenie k jetomu putem ispol'zovanija hvosta zamedlennyh pul'sirujushhih nejtronov neposredstvennym obra- zom byla izmerena reaktivnost' v sil'no podkriticheskih sistemah s p Greater-Than-Or-Equal-To -40$. Rezul'taty sravnivajutsja so statisticheskimi izmerenijami, i oni dajut ves'ma horoshee sovpadenie. (author)}
place = {IAEA}
year = {1965}
month = {Oct}
}