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5 years ago

Applying the pulsed ion chamber methodology to full range reactor ...

Applying the pulsed ion chamber methodology to full range reactor ...

decay of

decay of the fission product inventory. Thus, above 10 ' 1 ] 2 neutrons/cm / sec, the output of the gamma-only section of the compensated chamber can be used to determine the power level of 3 reactor. Depending on the overall detector design, fluxes as high as 10 i; could be measured using this technique. Thus, a single sensor system utilizing the modes des- cribed, with the proper sensor., would indicate reactor power over the full expected range of operation, encompassing a possible neutron flux range of 10 to 10 neutrons/cm /sec. To design and assemble such a system from the basis which existed at. the initiation of this program would not only have been difficult but also impractical. While verification of some of the basic PIC responses were performed, the entire range and depth of its response had not been proven as a whole. For instance, neither full range gamma compensation nor the chamber's response to temperature variations of greater than approximately 280° C had beer, examined fully. For this reason the prototypic system described below was designed not only for demonstrating the operational characteristics of the PIC instrumentation, but also to el low the gamma compensation capability to be better evaluated and the temperature characteristics measurements to be extended and reverified. The assembling of such a prototypic system not only indicates the feasibility of constructing the entire reactor grade system, but also offers a vehicle for examining, in depth, all the PIC methodology characteristics, PIC Electronic System The PIC electronic system is composed of 5 basic units; the high voltage pulser (HVP), the raw data acquisition system (PDA), a computer