The effect of oxygen on the release of tritium during baking of TFTR D–T tiles
The effect of oxygen on the release of tritium during baking of TFTR D–T tiles
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氧气对 TFTR D-T 瓷砖烘烤过程中氚释放的影响
DOI：
10.1016/s0920-3796(02)00101-1
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发表时间：
2002
影响因子：
1.7
通讯作者：
M. Nishi
中科院分区：
文献类型：
--
作者：
W. Shu;C. Gentile;C. Skinner;S. Langish;M. Nishi
在当前ITER设计条件（240°C和933 Pa O2）下，使用托卡马克聚变试验堆（TFTR）氘-氚燃烧操作期间使用的碳纤维复合材料砖立方体进行了一系列测试，包括10 h烘烤。沉积物的去除速率在近表面约为3 μm/h，在较深区域约为0.9 μm/h。在10小时烘烤期间从立方体释放的氚总量为202 MBq，而烘烤后立方体中剩余的氚为403 MBq。在933 Pa O2下于240°C焙烧10 h，可除去1/3的氚。经过10 h的烘烤后，立方体表面的氚浓度也下降了约1/3。此外，在纯Ar中在240°C下烘烤期间，一些氚从瓷砖的另一个立方体释放，并且当吹扫气体从纯Ar转变为Ar-1%O2时，观察到氚释放的快速增加。当在空气中350°C下烘烤1 h，然后在500°C下烘烤1 h时，整个TFTR瓷砖的氚释放率分别为53%和47%。在空气中烘烤时，氧与碳反应生成一氧化碳。
A series of tests involving 10 h baking under the current ITER design conditions (240°C with 933 Pa O2) was performed using a cube of a carbon fiber composite tile that had been used in Tokamak Fusion Test Reactor (TFTR) during its deuterium–tritium burning operation. The removal rate of the codeposits was about 3 μm/h near the surface and 0.9 μm/h in the deeper region. Total amount of tritium released from the cube during 10 h baking was 202 MBq, while remaining tritium in the cube after baking was 403 MBq. Thus 10 h baking at 240°C with 933 Pa O2removed 1/3 of tritium from the cube. After 10 h baking, the tritium concentration on the cube surface also dropped by about 1/3. In addition, some tritium was released from another cube of the tile during baking at 240°C in pure Ar, and a rapid increase of tritium release was observed when the purging gas was shifted from pure Ar to Ar–1%O2. When a whole TFTR tile was baked in air at 350°C for 1 h and then at 500°C for 1 h, the ratios of tritium released were 53 and 47%, respectively. Oxygen reacted with carbon to produce carbon monoxide during baking in air.