本发明公开了一种全陶瓷燃料棒，包括包壳，包壳内下段设FCM芯块、上段设气腔，气腔内设气腔弹簧；包壳内径为13 .5mm～15mm；FCM芯块中装载TRISO颗粒，TRISO颗粒核芯为UN或UO2颗粒，由内向外依次包裹厚度为100±10μm的疏松热解碳层、厚度为35±5μm的内层致密热解碳层、厚度为35±5μm的SiC层和厚度为20±5μm的外层密热解碳层；核芯直径为800±50μm；气腔长度为4 5 m m～5 5 m m ；气腔弹簧自由高度为67 .5mm～72 .5mm、外径为8 .8mm～9 .2mm、丝径为1 .875mm～1 .925mm。本发明提供的燃料棒，提高了铀装量，可适用于应轻水堆运行环境。

The invention discloses a full ceramic fuel rod, including a cladding, a FCM pellet in the lower section of the cladding, a gas cavity in the upper section, and a gas cavity spring in the gas cavity ; the inner diameter of the cladding is 13.5 mm ~ 15 mm. FCM pellets were loaded with TRISO particles. The core of TRISO particles was UN or UO2 particles, and the porosity with a thickness of 100 ± 10 μm was wrapped from inside to outside. 

Pyrolytic carbon layer, inner dense pyrolytic carbon layer with thickness of 35 ± 5μm, SiC layer with thickness of 35 ± 5μm and outer dense pyrolytic carbon layer with thickness of 20 ± 5μm. The core diameter is 800 ± 50 μm. The length of gas chamber is 45 mm ~ 55 mm. The free height of the air chamber spring is 67.5mm ~ 72.5mm, the outer diameter is 8.8mm ~ 9.2mm, and the wire diameter is 1.875mm ~ 1.925mm. The fuel rod provided by the invention improves the uranium loading and can be applied to the operating environment of the light water reactor.