Dynamic seals are one of the critical components of Absorber Rod Drive Mechanism of Fast Breeder Reactors, requiring separate experimental development. Their significance can't be overemphasized considering that the availability and re-usability of Control Rod Drive Mechanisms of Fast Breeder Test Reactor is governed by the failure rate of dynamic seals (bellows). For prototype and subsequent Fast Breeder Reactors in India, choice of the dynamic seal is changed to an in-house designed & developed labyrinth type V-ring seal. The present work is related to the numerical investigations carried out to gain insights into the sealing mechanism and the thermal behaviour of these seals. The results indicate that the seal geometry is very important for obtaining optimum performance. By changing the geometry of the present seal, performance enhancement by more than 50% in important indices is obtained. Further, the results point out that caution shall be exercised when the seal material & its operating temperature are changed. Also, the numerical model developed in this study will be useful for developing more robust dynamic seals in future.

动态密封件是快增殖堆吸收杆驱动机构的关键部件之一，需要单独的实验开发。考虑到快速增殖试验反应堆控制杆驱动机构的可用性和可重用性受动态密封件（波纹管）的故障率控制，它们的重要性再怎么强调也不为过。对于印度的原型和后续快速增殖反应堆，动态密封的选择改为内部设计和开发的迷宫式 V 型环密封。目前的工作与为深入了解密封机制和这些密封件的热行为而进行的数值研究有关。结果表明密封几何形状对于获得最佳性能非常重要。通过改变当前密封件的几何形状，重要指标性能提升50%以上。此外，结果还指出，当密封材料及其工作温度发生变化时，应谨慎行事。此外，本研究中开发的数值模型将有助于未来开发更强大的动态密封。