Seminars

Scheduled meeting of Scientific and Technical Council of SEC NRS was held

The issues considered

1. Results of review of background assessment for robustness of the nuclear research installations against extreme external impacts (‘stress-tests’).
2. Consideration of response to dissertation prepared by А.А.Kiselev “Software complex for justifying calculations of radiological safety of public in beyond-design-basis accidents at nuclear facilities”.

Decisions of Scientific and Technical Council of SEC NRS

On the first issue

Having heard and discussed the information presented by Dmitry N. Polyakov, Head of Nuclear Research Installations Safety Division (NRI SD), and after speaking in debates,

Scientific and Technical Council has noted that

Within the period of 2011-2014 the specialists of SEC NRS have fulfilled review of results from background assessment for robustness of the nuclear research installations against extreme external impacts (‘stress-tests’).

The results of the review performed clearly demonstrate that:

• All engineering and administrative measures available at NRI for protection against extreme external impacts that were adopted within the designs basis of these installations are in compliance with the regulatory documents requirements;
• In case of emergency situations that were considered in background assessment, the dose limits that necessitate public evacuation are not exceeded.

Following the results of review performed the proposals on improvement of regulatory documents in force are prepared and are under implementation.

Scientific and Technical Council has decided that

• NRI SD shall proceed with consideration of safety issues of NRI in case of extreme external impacts.
• NRI SD shall distribute report on results of review of background assessment for robustness of the nuclear research installations against extreme external impacts (or documentation covering basic results) to the operating organizations concerned.

• NRI SD shall prepare draft letters of Rostechnadzor to the operating organizations concerning presentation of the following information:
• on implementation of comments based on results of review of background assessment for robustness of the nuclear research installations against extreme external impacts;
• on implementation of operating organizations plans directed at improvement of NRI robustness against extreme external impacts.

On the second issue

Upon discussing the response to dissertation prepared by А.А.Kiselev (IBRAE RAS) “Software complex for justifying calculations of radiological safety of public in beyond-design-basis accidents at nuclear facilities” that was submitted for a degree of PH.D. in Engineering Science (speaker – Anatoly A. Stroganov, Deputy Head of Nuclear and Radiation Safety Division),

Scientific and Technical Council has noted that

The dissertation prepared by А.А.Kiselev is dedicated to the development of the unified and complete mathematical model in respect to varied physical processes influencing the ultimate result of calculation\evaluation of different characteristics of radiological environment and exposure doses of members of public and personnel due to radioactive substances discharge into atmosphere in case of severe beyond-design-basis accidents at nuclear facilities and the integrated methodology applied to correct parameters of the initial discharge as well as other input parameters of calculation following the instrumentation data from radiation surveillance and radiological monitoring regarding the natural environments. This dissertation is also dedicated to the development of software which implements the unified mathematical model and comprehensive methodology in the form of integrated software complex designed for implementation of all above-mentioned calculations\evaluations in a maximum computer-aided mode and in the sequential minimization of uncertainties values of such calculations\evaluations.

The practical relevance and novelty is certain, and the results of this work that combined almost all best scientific practices taken together to demonstrate the current status of the Gaussian models development in respect to impurities atmospheric dispersion and the present-day methodology on evaluation for individual radiological safety indices, are to be considered as indisputable scientific novelty due to the completeness of factors taken into consideration.

The dissertation prepared by А.А.Kiselev complies with criteria to thesis submitted for a degree of PH.D. in Engineering Science.

Scientific and Technical Council has decided to

Approve response to dissertation prepared by Alexey A. Kiselev “Software complex for justifying calculations of radiological safety of public in beyond-design-basis accidents at nuclear facilities”», submitted for a degree of PH.D. in Engineering Science with a specialization No. 05.14.03 “Nuclear Power Installations, including Design, Operation and Decommissioning”.

Chairman: А.А. Khamaza

Scientific Secretary: А.А. Аfanasiev