DDORNT: Department for Safety Analysis of Radiation Hazardous Objects

Head of department

Pavlovskyi Leonid Inokentiyovych

In 1985, Leonid Inokenteyevich Pavlovskyi graduated from the All-Union Correspondence Polytechnic Institute (Moscow) with a degree in “Nuclear Power Plants and Installations”.

Leonid works at the ISP NPP since 1996. Since 2005  he is a Deputy Head of the department, and from 2015 – Head of the Department for Safety Analysis of radiation hazardous objects.

Prior to the accident in 1986 and after that, he worked as Chief Engineer on the operating of the reactor at the Chornobyl Nuclear Power Plant. Member of the liquidation of the consequences of the accident at the Chornobyl Nuclear Power Plant since 1986. With his active participation, the reactors 1 and 2 of the Chornobyl Nuclear Power Plant were commissioned after the accident.

The main achievements of L. I. Pavlovskyi are the improvement of methods of studying the radiation situation in fields with high anisotropy of gamma radiation, as well as the implementation of new approaches to the development of radiation protection measures and the application of the ALARA principle in the designing of radiation hazardous works. L. I. Pavlovskyi is a co-author of the patent for the invention “Method for measuring the angular distribution of gamma radiation intensity”, as well as the author of more than 50 scientific publications.

For his personal contribution to the liquidation of consequences of Chornobyl disaster, he was awarded the «Order of Merit», III-rd degree, government diplomas and departmental honours.

Main directions of the department activities:

• research of the parameters of the radiation state of objects with radiation and nuclear technologies and prediction of radiation state changes in the process of carrying out of practical activities;
• development and justification of a complex of organizational, technical and radiation hygienic measures on radiation protection during normal operation and potential accidents at objects with radiation and nuclear technologies;
• development of safety analysis reports and reports on compliance with sanitary legislation;
• environmental impact assessment of radiation hazardous objects in different periods of their operation, development and justification of measures for minimization of radiation impacts on various components of the environment.

Results of activities in scientific field:

The methods and installations for research of parameters of a radiation situation and physical modelling of biological protection have been developed, in particular:

• a method and device for measuring the angular distribution of gamma radiation rate;
• device “Ekran” for physical shielding modelling;
• Gamma-ray spectrometer with a collimated detector;
• dosimeters-radiometers with remote collimated detectors and filters to determine the multiplicity of attenuation and effective energy of gamma radiation;
• method and installation for measuring the density of surface beta-radioactive contaminants in conditions of high gamma dose rate background.

With the use of developed methods and devices, data from comprehensive studies of the radiation state in the areas of work on the transformation of the “Shelter” object were obtained.

Safety analysis and environmental impact assessment reports have been developed and agreed by the regulatory authorities of Ukraine as part of the project documentation on the stabilization of the constructions of the Shelter object, the construction of a new ventilation stack, the construction of the NSC enclosing perimeter and the implementation of other international projects on transformation of the Shelter object within the framework of the “Shelter Implementation Plan”.

The scientific and technical support of the design of the first NSC commissioning complex (CC-1 NSC) was carried out as part of the justification of the provision of radiation safety during the construction and operation of the NSC.

Research of radiation conditions has been carried out, measures and justification to ensure radiation safety of personnel and the environment during the construction/modernization of objects with radiation and nuclear technologies in the exclusion zone have been developed, namely:

• construction of a centralized storage facility for long-term storage of spent ionizing radiation sources at the Vektor Complex;
• construction of the Centralized Storage facility for spent nuclear fuel;
• Conservation of the trench number 26 of the Radioactive Waste Disposal Site «Buryakivka»;
• feasibility study on the decommissioning of the Chornobyl NPP cooling pond and others.

Devices for measuring of gamma-radiation dose rate characteristics and simulation of bio-protection in the Shelter object

Simulation of biological protection in the premises of the Shelter object using the “Ekran” installation and Measurement of angular gamma radiation distributions in the premises of the Shelter object using the multi-detector device