INTERMEDIATE RANGE NUCLEAR INSTRUMENTATIONRadiation DetectorsINTERMEDIATE RANGE NUCLEAR INSTRUMENTATIONThree ranges are used to monitor the power level of a reactor throughout the fullrange of reactor operation. The intermediate range makes use of a compensatedion chamber.EO 3.4 Given a block diagram of a typical intermediaterange instrument, STATE the purpose of majorcomponents.a. Log n amplifierb. Differentiatorc. Reactor protection interfaceIntermediate-range nuclear instrumentation consists of a minimum of two redundant channels.Each of these channels is made up of a boron-lined or boron gas-filled compensated ion chamberand associated signal measuring equipment of which the output is a steady current produced bythe neutron flux.The compensated ion chamber is utilized in the intermediate range because the current output isproportional to the relatively stable neutron flux, and it compensates for signals from gammaflux. This range of indication also provides a measure of the rate of change of neutron level.This rate of change is displayed on meters in terms of startup rate in decades per minute (-1 to+10 decades per minute). High startup rate on either channel may initiate a protective action.This protective action may be in the form of a control rod withdrawal inhibit and alarm, or a highstartup rate reactor trip.IC-06 Page 66 Rev. 0
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