PRESENT REACTOR INSTRUMENTATION AND SAFETY CIRCUITS

The following discussions will be limited to a generalized or typical presentation reeaizlng that variations in equipment exist between reactors. However, where system concepts vary from reactor to reactor, each concept will be discussed. Instrumentation will be presented according to the classifications as defined in Section II-A (Page 11). Particular attention is given to the whole system. e. power supply, transducer, the instrument Itself, control function (safety circuit monitoring or readout device ) and pertinent comment.  

The IXX and 2XX Safety Circuits at B, D, and F Reactors are A.C., while the 3XX Safety Circuit is D.C. All three safety circuits are D. C. at the other reactors. 

A manual scram pushbutton is located on the reactor control console and Is readily accessible to the reactor operator  

The Pressure Monitor System (sometimes called the Panelllt ) monitors coolant flov contlntilty In each Individual process tube (200 at the old reactors and 3220 at the K Reactors) A venturi or orifice Is located at the Inlet nozzle of each tube  

The K Reactors are equipped with double pole single throw switches which are connected Into Individual row and column tripping circuits using two relays In series per circuit  

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