本发明涉及核燃料芯块技术领域，具体地说是一种抗水腐蚀氮化铀复合燃料芯块，其特征在于：包括起保护作用的耐腐蚀金属体、分散在耐腐蚀金属体内的氮化铀颗粒。本发明与现有技术相比具有如下优势：1、通过耐腐蚀金属体将易与高温水、水蒸气发生反应的氮化铀燃料分隔开，提高了芯块暴露于高温冷却水或水蒸气时维持完整性的能力；2、芯块尺寸与现有燃料芯块一致，可装入现有反应堆燃料棒中，易于使用；3、适用于现役轻水反应堆，相比现役UO₂燃料芯块或单相氮化铀燃料芯块具有较高的安全性，有利于消除PCI问题。

The invention relates to the technical field of nuclear fuel pellets, in particular to a water corrosion resistant uranium nitride composite fuel pellet which is characterized in that: comprises a corrosion-resistant metal body for protection and uranium nitride particles dispersed in the corrosion-resistant metal body. Compared with the prior art, the invention has the following advantages: 1. uranium nitride fuel which is easy to react with high-temperature water and water vapor is separated through the corrosion-resistant metal body, so that the capability of maintaining integrity of the pellets when the pellets are exposed to high-temperature cooling water or water vapor is improved; 2. the size of the pellet is consistent with that of the existing fuel pellet, and the pellet can be installed in the existing reactor fuel rod and is easy to use; 3. is suitable for the active light water reactor, and is compared with the active UO₂The fuel pellet or single-phase uranium nitride fuel pellet has higher safety, and is beneficial to eliminating the PCI problem.