Document Type : Research Paper
Authors
1 NSTRI
2 Dr/AEOI
3 thermohydraulic
Abstract
One of the methods that is taken to design and optimize engines and turbines to obtain high efficiency is the use of Maximum Temperature Crystal Sensors (MTCS). These sensors are made in very small dimensions and can be placed in the desired location inside the turbine and measured the maximum temperature created. It is worth mentioning, high fluence of fast neutrons is required to produce these sensors. The MTCS method is based on the high temperature phenomenon to restore the changes made in the crystal lattice caused by neutron irradiation. Calculations of the maximum fast neutrons flux for the diamond sample were performed using MCNP6 with the simulation of the core of the Tehran Research Reactor (TRR). Also, activity calculations were done using ORIGEN2 and dose rate through MCNP6 and temperature calculations with ANSYS software at different points of the sample. The highest fast neutron flux is calculated and the amount of activity of the sample has decreased significantly after 40 days and the dose rate at a distance of one meter reached to 1.4 µSv/h. Also, temperature calculations show that the maximum temperature at the lowest speed of the channel is 402 K, which will not cause any problem thermally. Next, using the X-Ray diffraction (XRD) method, the lattice number and unit cell volume were calculated for the sample. The results obtained show that diamond sample from the point of neutronic, dosimetry, thermohydraulic and changes in crystal lattice structure, can be suggested as crystal sensor in Tehran research reactor.
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