ACTIVATION METHOD FOR MEASUREMENTS PARAMETERS OF REACTOR NEUTRON SPECTRA [poster]
17th Symposium of AER on VVER Reactor Physics and Reactor Safety (2007, Yalta, Crimea (Ukraine, back then))
CORE OPERATION, EXPERIMENTS AND CODE VALIDATION
The method activation researches parameters of neutron energy spectral are developed in RRC KI. The method use multi component detectors, which were named ?Unified Composite Detectors? (UKD). Methodical basis of the measurements is Westcott formalism for representation of a spectrum in thermal and epithermal areas of energies [1, 2]. Parameters of the spectrum are: Ft – thermal flux, fepi – parameter epithermal flux and ?n – temperature of neutron gas. The detector includes nuclides – targets 164Dy, 55Mn, 197Au, 186W, 81Br. They are used for determination of absolute values of DNF of thermal (Ft) and parameter (fepi) epithermal neutrons: nuclides 164Dy, 55Mn – for thermal area and nuclides 197Au, 186W, 81Br – for epithermal areas – (up to 120 eV). Detectors with nuclide 115In are used for estimations of DNF in transitional area of the spectrum.