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Design and Experimental Evaluation of an Electromagnetic Acceleration System for Fast Safety Rods; Etude Theorique et Experimentale d'un Mecanisme Electromagnetique d'acceleration pour des Barres de Securite; Proektirovanie i ehksperimental'naya otsenka ehlektromagnitnoj sistemy uskoreniya dlya avarijnykh sterzhnej bystrogo dejstviya; Proyecto y Estudio Experimental de un Sistema Electromagnetico de Aceleracion para Barras Rapidas de Seguridad

Conference:

Abstract

The safety system of a reactor must have a very short delay time if it is to control very fast reactivity disturbances. The electronic parts.of a safety system may be equipped with short response times very easily, whereas reduction of the mechanical release time of the safety rod is a difficult task More exact investigations show that, besides the short release time, high initial speed of the rod would be an advantage. At equal total times of insertion a rod having uniform velocity is by far superior to a rod having uniform acceleration. From this it is seen that a pulse-shaped acceleration is the proper way of driving safety rods to meet fast reactivity disturbances, because such acceleration takes care of short delay times and provides high initial velocities. An electromagnetic pulse generator was found to be suitable for application in safety rods. It features these advantages: (a) The components are few and of simple and sturdy design, which may easily be included in a safety rod and can also be designed for conditions near the core (high levels of temperature and radiation); (b) Driving energy is stored in an electric capacitor and thus is also available in case the  More>>
Authors:
Dosch, P.; Kraus, H. -J.; Uhrig, H. [1] 
  1. Kernreaktor Bau- und Betriebs-Gesellschaft m.b.H., Karlsruhe, Federal Republic of Germany (Germany)
Publication Date:
Jun 15, 1964
Product Type:
Conference
Resource Relation:
Conference: Symposium on Physics and Material Problems of Reactor Control Rods, Vienna (Austria), 11-15 Nov 1963; Other Information: 2 refs., 14 figs., 4 tabs.; Related Information: In: Physics and Material Problems of Reactor Control Rods. Proceedings of the Symposium on Physics and Material Problems of Reactor Control Rods| 808 p.
Subject:
42 ENGINEERING; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ACCELERATION; CONTROL; DESIGN; DISTURBANCES; ELECTROMAGNETIC PULSES; REACTIVITY; SCRAM RODS; TIME DELAY; VELOCITY; WEIGHT
OSTI ID:
22127617
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3030082696
Submitting Site:
INIS
Size:
page(s) 571-588
Announcement Date:
Sep 12, 2013

Conference:

Citation Formats

Dosch, P., Kraus, H. -J., and Uhrig, H. Design and Experimental Evaluation of an Electromagnetic Acceleration System for Fast Safety Rods; Etude Theorique et Experimentale d'un Mecanisme Electromagnetique d'acceleration pour des Barres de Securite; Proektirovanie i ehksperimental'naya otsenka ehlektromagnitnoj sistemy uskoreniya dlya avarijnykh sterzhnej bystrogo dejstviya; Proyecto y Estudio Experimental de un Sistema Electromagnetico de Aceleracion para Barras Rapidas de Seguridad. IAEA: N. p., 1964. Web.
Dosch, P., Kraus, H. -J., & Uhrig, H. Design and Experimental Evaluation of an Electromagnetic Acceleration System for Fast Safety Rods; Etude Theorique et Experimentale d'un Mecanisme Electromagnetique d'acceleration pour des Barres de Securite; Proektirovanie i ehksperimental'naya otsenka ehlektromagnitnoj sistemy uskoreniya dlya avarijnykh sterzhnej bystrogo dejstviya; Proyecto y Estudio Experimental de un Sistema Electromagnetico de Aceleracion para Barras Rapidas de Seguridad. IAEA.
Dosch, P., Kraus, H. -J., and Uhrig, H. 1964. "Design and Experimental Evaluation of an Electromagnetic Acceleration System for Fast Safety Rods; Etude Theorique et Experimentale d'un Mecanisme Electromagnetique d'acceleration pour des Barres de Securite; Proektirovanie i ehksperimental'naya otsenka ehlektromagnitnoj sistemy uskoreniya dlya avarijnykh sterzhnej bystrogo dejstviya; Proyecto y Estudio Experimental de un Sistema Electromagnetico de Aceleracion para Barras Rapidas de Seguridad." IAEA.
@misc{etde_22127617,
title = {Design and Experimental Evaluation of an Electromagnetic Acceleration System for Fast Safety Rods; Etude Theorique et Experimentale d'un Mecanisme Electromagnetique d'acceleration pour des Barres de Securite; Proektirovanie i ehksperimental'naya otsenka ehlektromagnitnoj sistemy uskoreniya dlya avarijnykh sterzhnej bystrogo dejstviya; Proyecto y Estudio Experimental de un Sistema Electromagnetico de Aceleracion para Barras Rapidas de Seguridad}
author = {Dosch, P., Kraus, H. -J., and Uhrig, H.}
abstractNote = {The safety system of a reactor must have a very short delay time if it is to control very fast reactivity disturbances. The electronic parts.of a safety system may be equipped with short response times very easily, whereas reduction of the mechanical release time of the safety rod is a difficult task More exact investigations show that, besides the short release time, high initial speed of the rod would be an advantage. At equal total times of insertion a rod having uniform velocity is by far superior to a rod having uniform acceleration. From this it is seen that a pulse-shaped acceleration is the proper way of driving safety rods to meet fast reactivity disturbances, because such acceleration takes care of short delay times and provides high initial velocities. An electromagnetic pulse generator was found to be suitable for application in safety rods. It features these advantages: (a) The components are few and of simple and sturdy design, which may easily be included in a safety rod and can also be designed for conditions near the core (high levels of temperature and radiation); (b) Driving energy is stored in an electric capacitor and thus is also available in case the power supply fails; and (c) The design can easily be made in such a way. as to permit an unrestricted free fall in case the pulse fails. The results of experimental investigations conducted in electromagnetic pulse generators are described. It is possible to accelerate a safety rod after less than a millisecond to initial speeds of several.metres per second, depending upon the weight of the rod, of course. The design of a fast safety rod for a fast zero-energy assembly (SNEAK) is described. A prototype of this safety rod is being tested. The results have thus far been very satisfactory. (author) [French] Les barres de securite d'un reacteur doivent pouvoir etre abaissees dans des delais tres courts si l'on veut compenser des variations tres brusques de reactivite. Il est tres facile de munir la partie electronique d'un dispositif de securite d'appareils a declenchement rapide, mais il est difficile de reduire le temps necessaire pour liberer mecaniquement les barres de securite. D'apres des etudes poussees, il est souhaitable non seulement que la barre se declenche rapidement mais egalement que sa vitesse initiale soit elevee. Pour des temps d'insertion egaux au total, une barre ayant une vitesse uniforme est de loin preferable a une barre ayant une acceleration uniforme. Ces considerations montrent qu'une acceleration ayant le caractere d'une impulsion constitue la meilleure maniere d'entraiher efficacement les barres de securite en cas de variations brusques de reactivite parce qu'on obtient ainsi des temps de declenchement courts et des vitesses initiales elevees. P s'est avere qu'un generateur d'impulsions electromagnetique convient bien pour les barres de securite. Ce mecanisme presente les avantages suivants: a) Il est compose d'un petit nombre de pieces simples et robustes qui peuvent facilement s'incorporer dans une barre de securite et egalement supporter les conditions regnant dans la region du coeur (niveaux eleves de temperature et d'irradiation), b) l'energie necessaire pour entrafher les barres est emmagasinee dans un condensateur electrique; l'alimentation en courant est donc assuree meme en cas de panne du secteur, c) le systeme est cohcu de telle facon que la barre puisse tomber librement pour le cas ou l'impulsion ne se produirait pas. L'auteur decrit les resultats d'etudes experimentales faites sur des generateurs d'impulsions electromagnetiques. H est possible d'accelerer, en moins d'une milliseconde, la chute d'une barre de controle jusqu'a lui donner une vitesse initiale de plusieurs metres par seconde, cette vitesse etant fonction evidemment du poids de la barre. L'auteur decrit le modele d'une barre de securite destinee a un reacteur a neutrons rapides de puissance zero (SNEAK). Un prototype de cette barre est actuellement soumis a des essais. Les resultats obtenus jusqu'a present se sont reveles tres satisfaisants. (author) [Spanish] Para controlar alteraciones muy rapidas en la reactividad, el sistema de seguridad de un reactor ha de actuar con un tiempo de retardo sumamente breve. La parte electronica de dicho sistema puede alcanzar con facilidad tiempos de reaccion muy cortos, pero es dificil reducir el tiempo de disparo mecanico de la barra de seguridad. Investigaciones meticulosas muestran que, ademas de un tiempo de disparo corto, convendria que la barra tuviese una elevada velocidad inicial. Para tiempos totales de insercion iguales, es de lejos preferible una barra animada de una velocidad uniforme que una barra sometida a una aceleracion uniforme. De estas consideraciones se deduce que el metodo adecuado de accionar las barras de seguridad para hacer frente a alteraciones rapidas de la reactividad es una aceleracion en forma de impulso, pues ello permite tiempos de retardo breves y elevadas velocidades iniciales. Se ha comprobado que un generador de impulsos electromagneticos se presta para su aplicacion al mando de las barias de seguridad. Ofrece las siguientes ventajas: a) pocos componentes de construccion sencilla y robusta que pueden incorporarse facilmente en una barra de seguridad, asi como adaptarse a las condiciones reinantes en las-proximidades del cuerpo del reactor (temperatura e intensidad de irradiacion elevados); b) la energia de mando se acumula en un condensador, es decir, permanece disponible aunque se interrumpa el suministro de corriente ; c) puede disenarse facilmente, de modo que permite la caida libre sin restricciones si falla el impulso. Se exponen los resultados de los estudios experimentales efectuados con generadores de impulsos electromagneticos. En un plazo inferior a 1 ms es posible acelerar la barra.de seguridad comunicandole velocidades iniciales de varios metros por segundo, dependiendo el valor exacto del peso de la barra. Se describe el diseflo'de una barra rapida de seguridad para un conjunto rapido de potencia nula (SNEAK). Se esta ensayando un prototipo de dicha barra. Los resultados obtenidos hasta ahora han sido muy satisfactorios. (author) [Russian] Sistema avarijnoj zashhity reaktora dolzhna dej stv ov at' s minimal'noj za d erzh k oj , esli ona prednaznachena dlja kontrolja ochen' bystryh otklonenij reaktivnosti. V jelektronnyh chastjah sistemy avarijnoj zashhity mozhno ochen' legko dobit'sja bystrogo srabatyvanija, t o gd a kak sokrashhenie vremeni m ehanicheskogo vysvobozhdenija avarijnogo sterzhnja javljaetsja trudnoj za d a ch ej. Bole etshhatel'nye issledovanija pokazyvajut, chto pomimo nebol'shogo vremeni vysvobozhdenija, preimushhestvo daet vysokaja pervonachal'naja skorost' sterzhnja. Pri odinakovom kolichestve vremeni, zatrach i v a emom na v v edenie st erzh n ja , sterzhni s ravnomernoj skorost'ju n emn ogo p revoshodjat sterzhni s ravnomernym u skoreiem . - Na osnovanii jetih soobrazhenij mozhno schi t a t' , chto impul'snoe u sk oren ie ja vlja etsja pravil'nym metodom vvedenija avarijnyh sterzhnej dlja ustranenija bystryh otklonenij r e aktivnosti, tak kak jeto daet nebol'shuju zaderzhku i obespechivaet vysokuju pervonachal'nuju skorost'. Ustanovleno, chto v avarijnyh sterzhnjah mozhno primenit' jelektromagnitnyj impul'snyj g en er ator. On imeet sledujushhie preimushhestva: a) nebol'shoe kolichestvo komponentov prostoj i prochnoj konstrukcii, kotorye mogut byt' legko vkljucheny v avarijnyj sterzhen', a takzhe mogut byt' skonstruirovany dlja u slovij, sushhestvujushhih okolo aktivnoj zony (vysokie urovni temperatury i izluchenija); b) jen ergi ja , privodjashhaja v dvizhenie sterzhni, akkumuliruetsja v jelek trok on den satore i p o jet om u takzhe mozhet byt' ispol'zovana v sluchae prekrashhenija jenergopitanija; v) konstrukciju legko mozhno prisposobit' k tomu, chtoby ona mogla svobodno i be sp r e pjatstvenno padat' v sluchae prekrashhenija impul'sov. V doklade opisyvajutsja rezul'taty jeksperimental'nyh issledovanij, provedennyh s jelektromagnitnymi generatorami impul'sov. Mozhno uskorit' dvizhenie avarijnogo sterzhnja m enee chem chere z odnu tysjachnuju sekundy do pervonachal'nyh skorostej v neskol'ko metrov v sekundu v za v i sim o sti , konechno, ot v e sa st erzhnja. Opisyvaetsja konstrukcija avarijnogo sterzhnja bystrogo dejstvija dlja sborki nulevoj moshhnosti na bystryh nejtronah ( SNEAK ). V nastojashhee vremja ispytyvaetsja prototip jetogo avarijnogo sterzhnja. Poluchennye do sih por rezul'taty ves'ma udovletvoritel'ny. (author)}
place = {IAEA}
year = {1964}
month = {Jun}
}