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Special concretes for protection in piles (1963); Les betons speciaux dans la protection des piles (1963)

Abstract

The report reviews the main concretes used for the protection of reactors. First are examined the general factors affecting the selection of concretes for protection; some of the general aspects of radiation attenuation (fast and thermal neutrons, {gamma}) are then recalled. After an enumeration of the qualities and defects of conventional concretes, desirable or possible improvements are proposed: introduction of heavy elements for increasing the efficiency with respect to fast neutrons and {gamma}; increase in the hydrogen content (as H{sub 2}O), addition of absorbent products (B, Li, rare earths) for thermal neutron capture. A list is given of the principal products used for this purpose. Finally there is a rapid review of the preparation, the stability with time, and the resistance to radiation and to heat. Appendices and tables give details and numerical values. Appendix 1 deals with the question of water in concretes. Appendix 2 gives a classification of concretes based mainly on their density. At the end, ten tables give the compositions and values of the physical and mechanical characteristics of sixteen particularly typical concretes. (authors) [French] Le rapport passe en revue les principaux betons utilisables pour la protection des reacteurs. On examine d'abord les facteurs generaux influencant  More>>
Authors:
Condat, M J; Lafore, P; Rastoin, J [1] 
  1. Commissariat a l'Energie Atomique, Fontenay-aux-Roses (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1963
Product Type:
Technical Report
Report Number:
CEA-R-2312
Resource Relation:
Other Information: 37 refs
Subject:
36 MATERIALS SCIENCE; COMPARATIVE EVALUATIONS; CONCRETES; DENSITY; MECHANICAL PROPERTIES; MOISTURE; NEUTRON ABSORBERS; RADIATION PROTECTION; REACTOR CORES; REACTOR SAFETY; SHIELDING MATERIALS
OSTI ID:
20808566
Research Organizations:
CEA Fontenay-aux-Roses, 92 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R2312110071
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
79 pages
Announcement Date:
Dec 23, 2006

Citation Formats

Condat, M J, Lafore, P, and Rastoin, J. Special concretes for protection in piles (1963); Les betons speciaux dans la protection des piles (1963). France: N. p., 1963. Web.
Condat, M J, Lafore, P, & Rastoin, J. Special concretes for protection in piles (1963); Les betons speciaux dans la protection des piles (1963). France.
Condat, M J, Lafore, P, and Rastoin, J. 1963. "Special concretes for protection in piles (1963); Les betons speciaux dans la protection des piles (1963)." France.
@misc{etde_20808566,
title = {Special concretes for protection in piles (1963); Les betons speciaux dans la protection des piles (1963)}
author = {Condat, M J, Lafore, P, and Rastoin, J}
abstractNote = {The report reviews the main concretes used for the protection of reactors. First are examined the general factors affecting the selection of concretes for protection; some of the general aspects of radiation attenuation (fast and thermal neutrons, {gamma}) are then recalled. After an enumeration of the qualities and defects of conventional concretes, desirable or possible improvements are proposed: introduction of heavy elements for increasing the efficiency with respect to fast neutrons and {gamma}; increase in the hydrogen content (as H{sub 2}O), addition of absorbent products (B, Li, rare earths) for thermal neutron capture. A list is given of the principal products used for this purpose. Finally there is a rapid review of the preparation, the stability with time, and the resistance to radiation and to heat. Appendices and tables give details and numerical values. Appendix 1 deals with the question of water in concretes. Appendix 2 gives a classification of concretes based mainly on their density. At the end, ten tables give the compositions and values of the physical and mechanical characteristics of sixteen particularly typical concretes. (authors) [French] Le rapport passe en revue les principaux betons utilisables pour la protection des reacteurs. On examine d'abord les facteurs generaux influencant la selection des betons de protection; on rappelle ensuite brievement les aspects generaux de l'attenuation des rayonnements (neutrons rapides, neutrons thermiques, {gamma}). Apres avoir rappele les qualites et les defauts des betons classiques, on fait ressortir les perfectionnements souhaitables ou necessaires: introduction d'elements lourds pour ameliorer l'efficacite contre les neutrons rapides et les {gamma}; augmentation de la teneur en H (en H{sub 2}O); addition de corps absorbants (B, Li, terres rares) pour capturer les neutrons thermiques. On enumere les principaux corps utilises a cet effet. On termine par un tres rapide apercu sur la mise en oeuvre, la stabilite dans le temps et la tenue aux rayonnements et a la chaleur. Des annexes et des tableaux donnent des precisions et des valeurs numeriques. L'annexe 1 traite de la question de l'eau dans les betons. L'annexe 2 donne une classification des betons basee principalement aur leur densite. Enfin dix tableaux donnent pour seize betons particulierement representatifs, les compositions ainsi que les valeurs des caracteristiques physiques et mecaniques. (auteurs)}
place = {France}
year = {1963}
month = {Jul}
}