Nuclear reactors are designed to maintain a chain reaction producing a steady flow of neutrons generated by fission of heavy nuclei, such as uranium. They produce thermal energy, which is converted into mechanical energy and ultimately into electrical energy feeding to a grid network. In a nuclear reactor, fuel undergoes various power/temperature transients during normal and off -normal situations. One needs to simulate these transients in experimental facilities for performing variety of reactor engineering and safety related tasks. The facility consists of scaled thermal hydraulic test setup comprising process equipment, instrumented nuclear fuel channel simulator, and high current converters for feeding power equivalent to fission power to those simulators to handle the transients safely in controlled manner. The experimental results are used to generate database of various vital nuclear reactor process parameters under all types of operational transients and off -normal conditions that can be compared with predictions from computer codes thus validating ever-evolving and advanced software. Besides, simulation of severe accidental conditions of nuclear reactor in facility is also necessary for evaluation of thermal hydraulic design safety margin. A low-resistance fuel simulator of identical geometry with power scaling is directly heated by high dc current to simulate fission power for generating experimental database. The converters have capability to generate power/temperature transients for simulating nuclear reactor conditions. This article presents design, functional description, specifications, simulation, hardware implementation of 10 kA, 12-pulse, thyristorized converters powering fuel simulators. The successful implementation of parallel operation of four converters feeding 27 kA current is described in this article.

中文翻译：

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给核燃料模拟器供电的高电流大功率多脉冲转换器的设计实现和并行操作

核反应堆的设计目的是维持一个连锁反应，从而产生稳定的中子流，该中子流是由诸如铀之类的重原子核的裂变产生的。它们产生热能，该热能被转换为机械能，最终转换为馈送到电网的电能。在核反应堆中，燃料在正常运行和正常运行期间会经历各种功率/温度瞬变离开 -正常情况。人们需要在实验设施中模拟这些瞬变，以执行各种反应堆工程和安全相关任务。该设施包括按比例缩放的热力液压测试设备，包括处理设备，仪器化的核燃料通道模拟器和大电流转换器，用于将与裂变功率等效的功率馈送到那些模拟器，以受控方式安全地处理瞬变。实验结果用于在所有类型的运行瞬变和非稳态下生成各种重要核反应堆过程参数的数据库。离开 -可以与计算机代码的预测进行比较的正常条件，从而验证了不断发展的先进软件。此外，还需要对设施中核反应堆的严重意外情况进行仿真，以评估热工水力设计的安全裕度。具有高功率比例的几何形状相同的低电阻燃料模拟器直接由高直流电流加热，以模拟裂变功率以生成实验数据库。转换器具有产生功率/温度瞬变以模拟核反应堆条件的能力。本文介绍了为燃料模拟器提供动力的10 kA，12脉冲，可控硅整流器的设计，功能描述，规格，仿真，硬件实现。