Defining the options to reduce radiation risks associated with the Techa Cascade of water reservoirs

«Radiation and Risk», 2016, vol. 25, No.2, pp.91-99


Utkin S.S. – Head of Department, C. Sc., Tech. Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAS), Moscow. Contacts: 52, Bolshaya Tulskaya str., Moscow, Russia, 115191. Tel.: +7 (495) 955-23-77; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. .


The paper discusses methodological and calculation approaches used to evaluate various radiation risks associated with the world largest liquid radioactive waste storage facility – the Techa Cascade of water reservoirs at FSUE “PA “Mayak” (TCR). The study shows that common risk assessment methods are not appropriate for the majority of scenarios dealing with normal evolution and possible emergencies, as the direct impacts do not exceed relevant regulatory limits. The paper provides qualitative and quantitative estimates for seven risk types and stresses the relevance of each (TCR routine operation under standard water-level conditions, Techa river remediation, TCR impacts from other facilities, V-11 overflow followed by uncontrolled massive environmental contamination, fall in TCR water level causing wind-blown entrainment of radioactive substances, risks associated with tornado and manmade accidents). The article suggests an innovative forecast technique based on the integrated hazard index assessment. It enables quantitative forecast of TCR evolution dynamics during the whole period associated with its potential hazard in the context of different strategies aimed at reaching TCR final state. The paper overviews the options aimed at reaching the acceptable risk level within the next 30 years.

Key words
Radiation risk, socially acceptable risk, liquid radioactive waste, Techa Cascade of water reservoirs, normal operation, emergencies, strategic master-plan, life cycle, integrated hazard index, TCR-Prognoz.


1. Resolution of the State Duma of the Federal Assembly of the Russian Federation of December 11, 1998 N 3369-II GD «On emergency radiation and environmental situation in the Uralsk region caused by operation of PA “Mayak” facilities». (In Russian).

2. Resolution of the Government of the Russian Federation of August 29, 2001 N 637 «On the Federal Target Program «Mitigating the consequences of radiation accidents until 2010». (In Russian).

3. List of instructions compiled following the working visit of the President of the Russian Federation to the Urals Federal District in March 6, 2003 of March 26, 2003 N Pr-516 (p.5. «To develop a set of additional measures aimed at eliminating the risk of environmental disaster at the Techa Cascade of water reservoirs, FSUE “PA “Mayak”. Responsible officials: M.M. Kasyanov, A.Yu. Rumyancev. Completion deadline – June 1, 2003»). (In Russian).

4. IBRAE RAS. Strategic master-plan on addressing the challenge of the Techa Cascade of water reservoirs at FSUE “PA “Mayak”. Approved by the Chief Executive Officer of the State Corporation “Rosatom” on February 12, 2016. (In Russian).

5. Federal State Unitary Geological Enterprise “Hydrospecgeologiya”. Fact sheet on the subsoil state in the Russian Federation in 2014. Issue 38, Moscow, 2015. 268 p. (In Russian).

6. Research and Production Association "Typhoon". Annuary “Radiation situation in the territory of the Russian Federation and its neighboring states in 2014”. Obninsk, 2015. 350 p. (In Russian).

7. Pryakhin E.A., Tryapitsyna G.A., Deryabina L.V., Andreev S.S., Dukhovnaya N.I., Osipov D.I., Obvint-seva N.A., Styazhkina E.V., Kostyuchenko V.A., Popova I.J., Akleyev A.V., Stukalov P.M., Ivanov I.A., Mokrov Yu.G. Current state of ecosystems at V-11, V-10, V-4, V-17 and V-9 reservoirs at “PA “Mayak”. Voprosy radiatsionnoy bezopasnosti – Radiation Safety, 2011, no. 2, pp. 5-23. (In Russian).

8. Reports on the SMP TCR. Stage 3, 2014 «Forecast calculations to assess the impact of TCR, V-9 and V-17 operating conditions on radioactive discharge rate from the nuclear legacy facilities into the environment considering different operation scenarios at FSUE “PA “Mayak” and the specified strategic goals». Report of JSC “Geospecgeologiya”. Moscow, 2014. (In Russian).

9. Myznikova O.G., Panchenko S.V., Utkin S.S. Evaluating the risk of wind-blown entrainment of radioactive substances from the shoreline of industrial reservoirs at “PA “Mayak”. Voprosy radiatsionnoy bezopasnosti – Radiation Safety, 2011, no. 2, pp. 56-66. (In Russian).

10. Biryukov D.V., Vedernikova M.V., Kovalchuk D.V., Savkin M.N., Samoilov A.A. Practical needs for the development of risk analysis techniques for the final stages of nuclear facilities’ lifecycle. Radiatsiya i risk – Radiation and Risk, 2015, vol. 24, no. 2, pp. 116-130. (In Russian).

11. Solving nuclear legacy challenges. Development of radioactive waste management system in Russia. Eds.: Bol'shov L.A., Krjukov O.V., Laverov N.P., Linge I.I. Moscow, 2013, vol. 2. 392 p.

12. IAEA Safety Standards series No. SSR-5. Disposal of Radioactive Waste. Specific Safety Requirements. Vienna, IAEA, 2011.

13. IAEA Safety Standards series No. SSG-14. Geological Disposal Facilities for Radioactive Waste. Specific Safety Guide. Vienna, IAEA, 2011.

14. IAEA Safety Standards series No. SSG-23. The Safety Case and Safety Assessment for the Disposal of Radioactive Waste. Specific Safety Guide. Vienna, IAEA, 2012.

Full-text article (in Russian)