Components for Nuclear Power & Energy - Application Center - ATTL Advanced Materials Co., Ltd.

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Application

The nuclear fusion research is a major international cooperation program implemented by the world's scientific community to address energy problems to be faced by humans in the future. Different from non-renewable energy resources and the conventional clean energy, fusion energy has the advantages of unlimited resources, no pollution to the environment, no production of high-level radioactive nuclear waste, etc., will be one of the dominant forms of energy in the future, and is one of the important ways currently recognized to be able to ultimately solve energy problems and environmental issues so as to promote the sustainable development of human society.

International Thermonuclear Experimental Reactor is a superconducting tokamak that enables large-scale nuclear fusion reactions. The plasma torus is in the ring-shape sheath of the shield blanket. The shield blanket will absorb 500,000 kilowatts of thermal power and all neutrons generated by the nuclear fusion reaction. Therefore, thermostable materials are needed to serve as the plasma-facing first-wall materials. Tungsten-copper composite parts, TZM and molybdenum-copper materials produced by ATTL can be used as the first-wall materials.

Material Introduction

Plasma-facing material is one of the most critical materials in the fusion reactor. The main requirements of the material are with low sputtering rate, high thermal shock resistance, high heat load capacity, low tritium retention, low activity radioactive and low decay heat. Through years of research, engineers found that tungsten metal material is the best choice.

Product Specification

Our tungsten products meet all the requirements of ITER as follows:

Table 1 – Chemical composition of W plates

Element

Composition max, wt. %

Permissible variation in Check analysis, wt. %

C

0.01

±0.002

O

0.01

+10% Relative

N

0.01

+0.0005

Fe

0.01

+0.001

Ni

0.01

+0.001

Si

0.01

+0.001

W purity ≥99.95%, density≥19.0 g/cm3

Table 2 – Grain size requirements of W plate

Thickness[mm]

Grain size [ASTM number] Samples must be cut perpendicular to the rolling direction

>10

3 or finer


Table 3 – Vickers hardness requirement of W plate

Thickness[mm]

Hardness HV30

>10

≥410

Success Cases

From 2007 we began to pay attention to and participate in the ITER project, research and develop the tungsten and tungsten copper composite products that meet the nuclear fusion requirements.

Tungsten copper products we produced in 2009 has successfully passed the ITER-JAP test and start batch delivery.

In 2012, we provided a high performance TZM alloy for the Chinese Academy of Sciences as the first wall material, passing the experimental test;

EAST supporting WCU filter passes the whole process of baking and dozens of guns long pulse discharge test in 15 years of the experiment;

Two PFC modules developed for WEST performed well in the HHF high heat radiation experiments, achiveing the world's leading results.

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