Process/reactor design protective measures

The process instrumentation system of the JRR-3M is consists of an instrumentation and control system and a safety protection system It is designed to measure process variables, such as flow rate, temperature, water level, pressure and so on, to provide information which is necessary for reactor operation and safety protection The measuring methods adopted in the system are of conventional ones but safety important components used are specified as reactor grade ... 

The basis of safety for a chemical reaction process is the combination of measures which are relied upon to ensure safety. Defining the basis of safety for a reactor is essential as it highlights those aspects of the design and operation (hardware, protective systems and procedures) which are safety-critical. There are many factors to be considered and further advice is given in references 1 and 2. 

The proper design of fuel reformer systems must pay careful attention to the minimization of carbon monoxide before the processed fuel stream enters the fuel cell stack. Many reformer systems use a secondary preferential oxidation reactor that selectively oxidizes the carbon monoxide present in reformate streams. In most transportation applications the steam reformer and the selective oxidation reactors do not operate under steady state conditions large transients may occur which produce relatively large amounts of carbon monoxide. It is highly desirable to have a low-cost real-time carbon monoxide measurement system that provides feedback control to the fuel processing system in order to protect the PEM fuel cells from performance degrading concentrations of carbon monoxide. 

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