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Reaktorski infrastrukturni center
V okviru testiranja detektorja sevanja Čerenkova, je naš reaktor TRIGA danes proizvedel pulz št. 500.
Podatki o pulzu so sledeči:
Na Siol.net se je pričela predvajati oddaja “S kavča na plano”, kjer zabavna voditelja, Aleš in Igor Novak, gledalce popeljeta po bolj ali manj skritih kotičkih Slovenije. V drugem delu oddaje sta obiskala tudi naš reaktor TRIGA.
Že več mesecev je onemogočeno normalno življenje zaradi preprečevanja širjenja virusa COVID-19. Na reaktorju TRIGA smo bili primorani odpovedati vse skupinske oglede našega laboratorija kamor spadajo tudi vsi obiski šolarjev. Vsako leto nas obišče skoraj 1500 slovenskih učencev. Da letošnja generacija ne bo prikrajšana za obisk raziskovalnega reaktorja, smo zaposleni posneli zanimiv video. Gledalce popeljemo skozi komandno sobo na ploščad reaktorja, od koder si ogledamo reaktor med obratovanjem na polni moči. Sledi še sprehod skozi Objekt vroče celice, kjer operaterji lahko varno rokujemo z radioaktivnimi materiali. Video si lahko ogledate na našem YouTube kanalu »JSI TRIGA research reactor«.
A negative fuel temperature reactivity feedback effect is of key importance in inherently safe reactor design. The purpose of the experiment is to measure the fuel temperature reactivity coefficient of the TRIGA reactor, i.e. the reactivity change due to a change in the fuel temperature.
After discussion on the physical principles governing the fuel temperature reactivity effects, students determine the fuel temperature coefficient of reactivity as a function of the fuel temperature, and the power coefficient of reactivity as a function of power.
The purpose of the experiment is to demonstrate the principles of reactor kinetics at low power levels and in the operating power level range by inducing step reactivity changes. The reactor power response to reactivity changes is analysed with the aid of a digital reactivity meter and simple theoretical kinetics models.
After an initial discussion, students observe the reactor power and asymptotic period response to sudden (step) reactivity change in different power ranges: in the low (zero) power range and in the operating power range. The dependence of the reactor period vs the magnitude of the reactivity is measured and compared with theoretical predictions. The point of adding heat (POAH) of the reactor is determined experimentally.
The critical experiment is one of the fundamental experiments in Reactor Physics. Its main purpose is to determine the critical number of fuel elements and / or control rod positions in a critical assembly. The experiment is regularly performed both at experimental and power reactors after each core modification. The purpose of the experiment is to demonstrate the procedure to reach criticality starting from a deeply subcritical state in a controlled sequence.
Students perform the critical experiment via gradual control rod withdrawal, measurement of the neutron signal on the starting channel and plotting the M-1 diagram. At every step, students estimate the critical control rod position by extrapolation. To experimentally confirm if the achieved state is subcritical, critical or supercritical, the neutron source is withdrawn from the reactor core following multiple steps, and the time dependence of the neutron source is monitored on line.
