弗里曼离子源灯丝中毒现象

根据近十年的工作实践，分析了Ｔ５１－２００／ＺＫ型金属离子注入机弗里曼离子源失效机理，着重讨论了以ＭｏＣｌ＿５为工作物质时的灯丝中毒现象。结合作者的工作经验，提出了减少灯丝中毒现象的一些具体措施。     

EAST ion cyclotron resonance heating system for long pulse operation

Radio frequency (RF) power in the ion cyclotron range of frequencies (ICRF) is one of the primary auxiliary heating techniques for Experimental Advanced Superconducting Tokamak (EAST). The ICRF system for EAST has been developed to support long-pulse high-β advanced tokamak fusion physics experiments. The ICRF system is capable of delivering 12 MW 1000-s RF power to the plasma through two antennas. The phasing between current straps of the antennas can be adjusted to optimize the RF power spectrum. The main technical features of the ICRF system are described. Each of the 8 ICRF transmitters has been successfully tested to 1.5 MW for a wide range of frequency (25–70 MHz) on a dummy load. Part of the ICRF system was in operation during the EAST 2012 spring experimental campaign and a maximum power of 800 kW (at 27 MHz) lasting for 30 s has been coupled for long pulse H mode operation.     

EAST-NBI离子源电极打火分析及处理

强流离子源是EAST(Experimental Advanced Superconducting Tokamak)中性束注入器(Neutral Beam Injector,NBI)最关键的核心部件,其能达到的性能在很大程度上决定了EAST中性束注入器所能达到的指标。离子源在束引出时电极打火现象偶有发生,这对于离子源的正常运行有非常严重的影响,甚至危害离子源的寿命。本文结合离子源运行过程中的束引出实验波形和水流量热计(Water Flow Calorimetry,WFC)系统的测量数据得出等离子体发射面的束流光学系统一直处于非最佳聚焦状态是导致打火的原因,试通过优化高压投入时刻等离子体与高压的匹配,实现高压的稳定投入有效抑制打火现象的发生,并且给离子源加入硬件保护机制,为离子源安全稳定运行奠定基础。     

密度锁工作特性的实验研究

介绍了密度锁的工作原理,并设计搭建了实验装置,研究了稳态工况和主泵停转事故时密度锁的工作特性。结果表明,在稳态工况下,密度锁能长期保持关闭,从而将主回路和余热排出回路隔开,此时,余热排出回路处于非工作状态,不会影响反应堆的正常工作。当发生主泵停转事故时,密度锁能迅速打开,使主回路和余热排出回路连通。余热排出回路会建立自然循环,且足以带走剩余热量。     

Atmospheric-Pressure Small-Scale Thermal-Hydraulic Experiment of a PIUS-Type Reactor

An experimental small-scale low-pressure setup of a PIUS (Process Inherent Ultimate Safety)-type reactor was used for the examination of the stability during normal operation such as startup and load following operation and of the safety during accidents such as loss-of-feed- water and pump runaway. Automatic feedback pump control system based on differential pressure at lower honeycomb density lock was quite effective to maintain the stratified interface between primary and pool water in the honeycomb density lock during normal operation. The process inherent ultimate safety characteristics of the PlUS-type reactor was confirmed with pump-trip scram at the pump speed limit for the various simulated accidents such as a loss-of- feedwater and pump runaway.     

反应堆主泵现场动平衡

核电站反应堆主泵是一回路的关键设备，其设备状态的优劣将直接影响核电站的安全和运和。本文描述了大亚湾核电站在反应堆主泵发生振动高的异常情况下，通过频谱分析和诊断，确定为不平衡故障，最终采用现场动平衡法进行处理，使主泵振动状态恢复到良好水平的过程。     

离心泵主要性能参数与反应堆安全运行

以离心泵的主要性能参数为依据。讨论了反应堆在运行过程中需要注意的问题：以高通量工程试验堆（HFETR）运行为背景，归纳了高心泵在运行过程中容易出现的10种典型故障；运用离心泵的基础知识，可帮助运行人员迅速发现，判断和处理离心泵在运行时发生的故障，保证反应堆安全运行。     

低能N^＋注入产色氨酸酶大肠杆菌的育种研究

利用了低能旷注入产色氨酸酶大肠杆菌Escherichia coli进行诱变选育。首先进行了离子注入条件及参数的探索,确立了以15％甘油作为保护剂,N^＋注入能量10keV,剂量13×10^14cm^-2的离子注入参数。反复筛选和连续突变后,获得高产色氨酸酶大肠杆菌,和出发菌株相比,其生物量和色氨酸酶活性均有所提高。经过发酵规模逐步扩大和酶促反应体系放大,菌体生物量可达8．2gww·L^-1,其酶法催化合成L-色氨酸的产量高达110g·L^-1。该菌继代培养遗传性能稳定,可操作性强,有很好的工业化前景。     

主给水泵自动再循环阀失效分析

对秦山核电站主给水泵上的自动再循环阀的工作原理、动作方式、受力情况及其失效机理等进行了剖析与探讨。在此基础上，提出了该阀的改进措施，介绍了在旁通管上增加电动截止阀代替自动再循环阀的工艺结构。