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Reactor Infrastructure Centre
7. in 9. julija smo gostili študente z Univerze Aix Marseille. Zaradi že dobro poznanih omejitev, ki otežujejo potovanja med državami, smo jih gostili le v virtualnem smislu. V sredo smo jim pripravili ogled reaktorja TRIGA, v petek pa smo izvedli vajo Porazdelitev nevtronskega fluksa znotraj sredice reaktorja TRIGA.
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«.
The water activation experiment serves as a demonstration of the creation of radioactive isotopes from nuclear reactions with fast neutrons in pure water. The main reaction product, N-16, is important from the radiation protection standpoint, as it emits energetic and highly penetrating gamma rays, in water-cooled fission and fusion devices. Conversely, measurements of the activities of the product radioactive isotopes represent an independent method of monitoring of the reactor power, leak detection, etc.
The purpose of the exercise is to measure the activity of radon and radon progeny in an indoor environment. Radon is one of the products of the 238U decay chain and it is the only one in gaseous form, and therefore the only one that can escape the out of the Earth’s crust. Radon may represent a significant contribution to natural radiation exposure, especially in karstic terrain (for which Slovenia is renowned), and after smoking, is the second most important cause of lung cancer.
The purpose of the experiment is a demonstration of the relative neutron activation analysis technique (NAA). This technique is widely used in a variety of fields (e.g. environmental sciences, forensic science, analysis of geological and inorganic materials, foodstuff, etc.). It plays a key role within environmental specimen banking programmes.
Gamma (ray) spectrometry is a widely used measurement technique in which gamma ray spectra originating from radioactive isotopes are analyzed. The purpose of the experiment is to demonstrate the gamma spectrometry technique by performing gamma spectrum measurements for a selection of radioactive sources. The complex features in the recorded gamma spectra are visualized and their origins explained; radionuclide activities are determined on the basis of the measured spectra, the basic nuclear data and the calibrated detection efficiency.
The exercise allows students to operate the reactor on their own under the supervision of a licensed reactor operator. First the students have to achieve criticality, then they have to change the reactor power level and stabilize the reactor at low power, below the point of adding heat. Secondly, they increase the reactor power above POAH and observe the reactor response to control rod movement at high power levels, where temperature feedback effects are significant. The exercise ends by safe and controlled shut down of the reactor.
After a discussion on the general features and systems of the reactor, reactor operation procedures and operating limits, students operate the reactor on their own. During operation, students observe the signals from the reactor instrumentation, i.e. the source range meter, linear channel, period meter and indicators of control rod positions. Each student performs a sequence in which the reactor is started up and stabilized at a low power level, the power level is then changed to a higher power level, and finally the reactor is shut down. No measurements are taken.
The pulse experiment is a demonstration of a reactor transient in a supercritical state, made possible by the inherently safe design of the TRIGA reactor. The aim of the experiment is to perform several pulses by rapidly withdrawing a control rod, measuring basic pulse parameters and experimentally validating the Fuchs-Hansen model.
After a discussion on the temperature reactivity effects and the Fuchs-Hansen model, students observe the behaviour of the reactor power and fuel temperature following sudden large insertions of reactivity, caused by the ejection of a control rod out of the reactor core. Students measure three pulse parameters: the maximum power, released energy and maximum fuel temperature, and observe their dependence to the prompt reactivity, thereby experimentally validating the Fuchs-Hansen model.
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