Uncertainty estimation in the forecasting of the 222Rn radiation level time series at the Canfranc Underground Laboratory

Nowadays decision making is strongly supported by the high-confident point estimations produced by deep learning algorithms. In many activities, they are sufficient for the decision-making process. However, in some other cases, confidence intervals are required too for an appropriate decision-making process. In this work, a first attempt to generate point estimations with confidence intervals for the $^{222}$Rn radiation level time series at Canfranc Underground Laboratory is presented. To predict the low-radiation periods allows correctly scheduling the unshielded periods for maintenance operations in the experiments hosted in this facility. This should minimize the deposition of radioactive dust on the exposed surfaces during these unshielded periods. An approach based on deep learning with stochastic regulation is evaluated in the forecasting of point estimations and confidence intervals of the $^{222}$Rn time series and compared with a second approach based on Gaussian processes. As a consequence of this work, an evaluation of the capacity of Gaussian process and deep learning with stochastic regularization for generating point estimations and their confidence intervals for this time series is stated.

THE CONSEQUENCES OF THE NATO BOMBARDING OF THE REPUBLIC OF SERBIA ON HUMAN HEALTH AND ENVIRONMENT

The aim of this paper is to warn all these people about the harmfulness of the 1999 bombing of the Republic of Serbia by ammunition with depleted uranium, many of which have contracted cancer and died. According to a NATO report, 31,000 depleted uranium missiles were delivered, according to the Yugoslav Army, there were 50,000 of them, and according to some Russian sources, as many as 90,000. Recall that the half-life of uranium U238 is 4.5 billion years. Special and extremely hard alloy missiles containing depleted uranium are usually arrows about 30 centimeters long. When striking a tank armor or bunker wall, the projectile develops a high temperature - about 1,200 degrees - which helps it to pass through the obstacle almost without resistance, further sharpening it. And when it passes through it, the uranium burns to the end and thus enhances the destructive effect of, for example, burning a tank of fuel in a tank or ammunition in it. Immediately after combustion, a rapid cooling begins and the formation of radioactive dust, ie aerosols, of micron particles that enter the body most often by inhalation.These fields have been decontaminated, and the presence of depleted uranium in the environment has not been determined, according to the IAEA. What hit us in 1999 and how long we would feel the effects of the bombing, the "Merciful Angel" or "Black Devil", as many Serbs would call him, since he came to the Balkans, he has unrest. And now, after 20 years, we can still, as experts say, feel its consequences, and worst of all, as they say, our children, grandchildren, great-grandchildren will probably feel it.

ANALYSIS AND PREDICTION OF RADIOACTIVE DUST TRANSFER AT THE NEW SAFE CONFINEMENT OF CHNPP OPERATION

The results of analysis and forecasting of the radioactive aerosols (RA) spread in the New Safe Confinement (NSC) under various conditions are presented. The conditions for the commissioning NSC, operation, dismantling of the OS (early dismantling) and removal of radioactive waste from the central hall of the OS are considered. Such analysis and forecasting was performed using computer CFD (computational fluid dynamics) model of the OS and NSC. The model takes into account sedimentation, accumulation and secondary dust emissions on the surfaces under the NSC, which allows obtaining distributions of surface contamination and determine the places of the highest contamination. References 5, tables 1, figures 5.

A Reform in the Helium Purification System of the HTR-10: γ Dose Rate Measurement and Suggestions for Decommissioning

A reform will be implemented in the helium purification system of the 10MW High Temperature Gas-cooled Test Reactor (HTR-10) in China. The measurement of the γ dose rates of facilities, including valves, pipes, dust filter, etc., in the purification system of the HTR-10, has been performed. The results indicated that most radiation nuclides are concentrated in the dust filter and facilities at the entrance of the helium purification system upstream of the dust filter. Other facilities have the same γ dose rate level as the background. Based on the previous study and experiences in AVR, the measurement results can be understood that the radioactive dust carried by the helium gas was filtered by the dust filter. It provides important insights for the decontamination and decommissioning of facilities in the primary loop, especially in the helium purification system of the HTR-10 as well as the High Temperature Reactor-Pebblebed Modules (HTR-PM).