Properties Influencing High-Temperature Gas-Cooled Reactor Coated Fuel Particle Performance
Properties Influencing High-Temperature Gas-Cooled Reactor Coated Fuel Particle Performance
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DOI：
10.13182/nt77-a31894
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发表时间：
1977-09
影响因子：
1.5
通讯作者：
D. P. Harmon;C. Scott
中科院分区：
文献类型：
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作者：
D. P. Harmon;C. Scott
研究了外热解碳（PyC）层对Triso和Biso包覆燃料颗粒辐照性能的影响。辐照温度为1000 - 1500 ℃（1273 - 1773 K）。快中子注量达到12.4 x 10/sup 25/ n/m/sup 2/（E大于29 fJ）/sub HTGR/，比大型高温气冷堆峰值设计辐照量8.0 x 10/sup 25/ n/m/sup 2/超出55%。密度在1.85和1.95 Mg/m/sup 3/之间且平均光学各向异性值等于或小于1.03（BAF/sub 0/单位）的涂层在Triso颗粒上表现出最好的辐照性能。对于Biso颗粒，必须以3至8的涂覆速率存款外层。Mu.. m/min，密度等于或大于1.84 Mg/m/sup 3/，以产生辐照后裂变气体不可渗透的涂层。从燃料棒测试的数据表明，它是重要的是要限制外部热解碳层的表面连接的孔隙度和在基质中的粘结剂相的量，以防止涂层失效导致的涂层-基质相互作用。
Properties affecting the irradiation performance of outer pyrolytic carbon (PyC) layers on Triso- and Biso-coated fuel particles were studied. Irradiation temperatures were 1000 to 1500/sup 0/C (1273 to 1773 K). Fast-neutron fluences reached 12.4 x 10/sup 25/ n/m/sup 2/ (E greater than 29 fJ)/sub HTGR/, which is 55 percent beyond the large high-temperature gas-cooled reactor peak design exposure of 8.0 x 10/sup 25/ n/m/sup 2/. Coatings with densities between 1.85 and 1.95 Mg/m/sup 3/ and mean optical anisotropy values of equal to or less than 1.03 (BAF/sub 0/ units) exhibited the best irradiation performance on Triso particles. For Biso particles, it is necessary to deposit the outer layer at coating rates between 3 and 8 ..mu..m/min and with densities equal to or greater than 1.84 Mg/m/sup 3/ to produce coatings impermeable to fission gases after irradiation. Data from fuel rod tests show that it is important to limit the degree of surface-connected porosity of the outer PyC layer and the amount of binder phase in the matrix to prevent coating failures resulting from coating-matrix interactions.