Irradiation Growth of Zirconium Alloys

2009 ◽  
pp. 1140-1140-8
Author(s):  
JC Yang ◽  
JY Ren
Keyword(s):  
Zirconium Alloys ◽  
Irradiation Growth

Test Reactor Irradiation Fuel Assembly Development in China

2017 ◽  
Author(s):  
Jie Ding ◽  
Yixiong Zheng ◽  
Yang Ding ◽  
Song Liu ◽  
Libing Zhu ◽  
...  
Keyword(s):  
Fuel Assembly ◽  
Zirconium Alloys ◽  
Reactor Irradiation ◽  
Fuel Rods ◽  
Post Irradiation ◽  
Irradiation Growth ◽  
Corrosion Creep ◽  
Test Reactor ◽  
Irradiation Performance ◽  
Test Fuel

During the development of zirconium alloys, the irradiation in the test reactor is a critical step to comparison the irradiation properties of candidate alloys, such as corrosion, creep and irradiation growth. In this paper, a small scaled fuel assembly for test reactor irradiation is designed, which meets the needs of new zirconium alloys development. The irradiation fuel assembly (IFA) can be easily disassembled, and the test fuel rods or irradiation specimen can be easily replaced, which makes it possible to do the further post-irradiation examination in the hot cell to obtain the irradiation performance data. Now the IFA has finish fabrication and the test reactor irradiation program is planned to launch in 2017.

Characterization of neutron irradiation damage in zirconium alloys—an international “round-robin” experiment

1978 ◽  
Vol 36 (1) ◽  
pp. 366-367
Author(s):  
D.O. Northwood ◽  
R.W. Gilbert ◽  
P.M. Kelly ◽  
P.K. Madden ◽  
D. Faulkner ◽  
...  
Keyword(s):  
Zirconium Alloys ◽  
Round Robin ◽  
Irradiation Damage ◽  
Exact Nature ◽  
Dislocation Loops ◽  
The Past ◽  
Irradiation Growth ◽  
Transmission Electron ◽  
International Round

Over the past few years there has been disagreement between laboratories on the exact nature of the damage in irradiated zirconium alloys. The main disagreement has centred on whether or not dislocation loops with c-component Burgers' vectors are formed during the irradiation. Since the presence of c-component loops was required in one of the current theories of irradiation growth and is considered in many other models, it was desirable to clear up this point and others relating to the nature of the damage such as loop size, loop concentration and the nature of the loop population, i.e. vacancy or interstitial. To this end a ‘round-robin’ series of transmission electron microscopy (TEM) examinations of neutron irradiated zirconium alloys was organized and the results are reported herein.The participants in the ‘round-robin’ included laboratories who had previously claimed to have seen evidence for c-component damage. The materials examined included zirconium and Zircaloy-2 irradiated at temperatures from 250-400°C, Table 1, the materials irradiated at 400°C providing samples with dislocation loops large enough to determine the interstitial/vacancy nature by inside/outside contrast techniques.

The response to heating of dislocation structures in zircaloy-2 irradiated to high neutron fluences

1984 ◽  
Vol 42 ◽  
pp. 482-483
Author(s):  
R.W. Gilbert
Keyword(s):  
Zirconium Alloys ◽  
Fast Neutrons ◽  
Dislocation Loops ◽  
Candu Reactors ◽  
Dimensional Changes ◽  
High Temperature Water ◽  
Irradiation Growth ◽  
Induced Dislocation ◽  
High Neutron ◽  
Temperature Water

Zirconium alloys have good neutron economy and corrosion resistance in high temperature water and this has led to extensive usage of these alloys in CANDU reactors. However, during neutron irradiation, dimensional changes occur in zirconium components due to the rearrangement of atoms knocked from their lattice sites by fast neutrons. This “irradiation growth” may limit the lifetime of some reactor components and an understanding of the variables that control the process is of commercial importance.It is believed that dislocations and dislocation loops act as sinks for the displaced atoms and thus control the direction and magnitude of the strain through their Burgers vector. A knowledge of the irradiation-induced dislocation structure is therefore required.

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