REACTOR PROTECTION AND POWER REGULATING SYSTEMS

The Nuclear Instrumentation comprises the Neutron Flux Instrumentation and a Nitrogen-16 Gamma Channel. Neutron flux measurement instrumentation supplies information on physical parameters to the Reactor Protection System and the Reactor Power Regulating System, describing the state of the reactor regarding neutron production and its evolution. 

The neutron flux measurement system comprises three independent measuring channels based on fission counters, a wide range fission chamber and compensated ionization chambers which are able to keep track of neutron flux for the whole operation range of the reactor. There is an overliq) between the chaimels, as well as an adequate margin over Full Power (FP) for the follow-up of eventual power excursions (see Fig. 3.1). 

The Reactor Protection System (RPS) includes two separate channels to cover the neutron excursion over the udiole operation range of the reactor (from source level to 125% of full power level). These chaimels are  

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