Delayed Neutron Detection with graphite moderator for clad failure detection in Sodium-Cooled Fast Reactors

被引：13
|
作者：
Rohee, E. [1 ]
Coulon, R. [1 ]
Jammes, C. [2 ]
Filliatre, P. [2 ]
Normand, S. [1 ]
Carrel, F. [1 ]
Laine, F. [1 ]
Hamrita, H. [1 ]
机构：
[1] CEA, LIST, Lab Capteurs & Architectures Elect, F-91191 Gif Sur Yvette, France
[2] CEA, DEN, SPEx, LDCI,Ctr Cadarache, F-13109 St Paul Les Durance, France
来源：
ANNALS OF NUCLEAR ENERGY | 2016年 / 92卷
关键词：
Fast reactor; Sodium; Clad failure; Fission products; Neutron detection; Photoneutron noise;
D O I：
10.1016/j.anucene.2016.02.003
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
In order to meet clean core challenges in Sodium-Cooled Fast Reactors (SFR), specific attention is paid to the cladding integrity. To monitor this integrity, Delayed Neutron Detection (DND) systems are implemented. During clad failures, neutron precursor fission products (mainly halogens: I-137, Br-87, Br-88) escape into the primary coolant. The detection of these precursors through their delayed neutron emission ensures a diagnosis on clad failures events. In DND systems, He-3 proportional counters are selected as the best available technology for neutron detection purposes. Associated with He-3 counters, polyethylene blankets are required in order to thermalize neutrons. The first part of this study is dedicated to the optimization of the DND device by Monte-Carlo simulations in order to improve the detection capability. This optimization focuses on the device design presenting a graphite based alternative to polyethylene blankets in order to remove photoneutron noise from D-2(gamma,n) reactions in polyethylene in presence of a high Na-24 activity (emission of gamma rays at 2.75 MeV). The experimental part of this study is devoted to the validation of a measuring station including an He-3 counter with carbon for neutron moderation. Both Monte-Carlo simulations and experimental results highlight the potential for a low-noise DND system based on graphite moderation. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：440 / 446
页数：7
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