The State Enterprise Radioactive Wastes (SE-RAW) is responsible for much of the waste management. On October 25 2011, a contract was signed drafting technical aspects and safety analysis for a low- and intermediate level waste interim storage facility near Kozloduy. A tender is expected mid 2012 and the facility is planned to go into operation in 2015. (*01) In 2009, a search for a location of a near-surface repository for low and intermediate level waste has been started. Four locations are taken into account.(*02)
Keep options open
In 1988, spent fuel from VVER-440 units (Kozloduy 1-4) was returned for the last time to Russia under the old contract conditions (free of charge), since then it is transferred to the wet spent fuel storage facility (WSFSF) for temporary storage, awaiting transfer to Russia or interim storage. WSFSF is in operation since 1990 on site at Kozloduy to take fuel from all the units. It is a standalone facility and is used as interim storage. Currently spent fuel is regularly transported to Russia under contracts signed in 1998 and 2002.(*03) Under a 2002 agreement, Bulgaria has been paying Russia US$ 620,000 per ton used fuel for reprocessing in the Mayak plant at Ozersk, though some has also been sent to the Zheleznogorsk plant at Krasnoyarsk.(*04)
In March 2011 a dry spent fuel storage facility (DSFSF) construction was finished. At the DSFSF the fuel from the closed units 1-4 (VVER-440) should be stored for a period of 50 years. In July 2011 an application for commissioning was submitted and is currently under review. (*05) The dry spent fuel depot will allow the country to store spent nuclear fuel for the long term in case it is unable to ship it abroad, its radioactive waste strategy said. Bulgaria is to decide by 2013 whether to build a deep-burying waste dump.(*06)
The principles of radioactive waste and spent fuel management were declared in the national Strategy for Spent Nuclear Fuel and Radioactive Waste Management, 2004, later confirmed and developed further in the Strategy for Spent Fuel and Radioactive Waste Management until 2030, adopted by the Council of Ministers in January 2011. It states that, accounting for the global and general European consensus for deep geological repository, this is presumably the most suitable option.
The SE-RAW implements activities related to the preliminary study of the possibilities for construction of deep geological repository. As a result from these activities a preliminary zoning of the country is made and three regions of interest are identified. In those regions 5 potential areas are localized and for every of the perspective areas an analysis of the geology-tectonic, geo-morphologic, neo tectonic, seismic, hydro-geological and engineer-geological and sociological economical characteristics is performed. On this base 6 potential geological blocks are localised, that can be additionally investigated. The potential host media are thick clay mergels and granites. (*07)
Sources
*01- Sofia Echo: Bulgaria selects consultant for radioactive waste depot, 26 October 2011
*02- Wolfgang Neumann: Nuclear Waste Management in the EU, October 2010, p 35
*03- Republic of Bulgaria: Fourth national report on fulfillment of the obligations on the Joint Convention on the Safety of Spent Fuel Management and on the Safety of Radioactive Waste Management, October 2011, p.8-9
*04- World Nuclear Association: Nuclear Power in Bulgaria, March 2012
*05- Republic of Bulgaria, October 2011, p.49
*06- Reuters: Bulgaria opens dry spent nuclear fuel depot, 12 May 2011
*05- Republic of Bulgaria, October 2011, p.52, 75