International Conference on Advancing the Global Implementation of Decommissioning and Environmental Remediation Programmes CN-238

DECOMMISSIONING OF KOZLODUY NPP UNITS 1 TO 4 - PROGRESS AND CHALLENGES

25 May 2016, 15:00

5m

Madrid

Oral Poster Technical and Technological Aspects of Implementing Decommissioning Programmes Session 4A - 3

Speaker

Mr Momchil Kazakov (State Enterprise Radioactive waste, Bulgaria)

Description

KAZAKOV, Momchil, Specialised Division Decommissioning Unit 1-4, SE RAW Address: Bulgaria, Kozloduy, Kozloduy NPP Site Email-address: momchil.kazakov@ie.dprao.bg 1. Introduction: State Enterprise Radioactive Waste – National Operator for the Activities for RAW Management and Decommissioning of Nuclear Facilities –background, management, structure. Kozloduy NPP Units 1-4, history of the units operation and shutdown. Normative framework. Funding. 2. The presentation: • Strategy for Decommissioning of Units 1-4 of Kozloduy NPP – Decommissioning Plan for KNPP Units 1-4, terms, key phases, final objective – brown field. • Dismantling activities – Dismantling of equipment in Turbine Hall of Power Units 1-4 – amounts planned, cutting techniques, results, pictures. Activities in the Controlled Area – radiological survey, decontamination, preparation for dismantling activities. Figure 1.Dismantling of TG–3 Rotor of Unit 2 • Free release of dismantled materials – Normative framework, Criteria, Free release procedures for different equipment type and various materials. • Projects implementation – Projects for RAW treatment – solidified phase from evaporator concentrate tanks (ECTs), spent ion-exchange resins, sludges and solid RAW; Supply of different types of containers for transport and storage of materials; Sites for materials management; Supply of lifting and transportation equipment; Design and construction of Size Reduction and Decontamination Workshop; Free release measurement facility. Figure.2 Facility for Retrieval and Stabilization of Spent Ion Exchange Resins - principle scheme. • Important steps until 2015 – Receipt of decommissioning licence; Programmes; Procedures; Demolition of civil structures in Turbine Hall of Power Units 1 and 2; Dismantling of equipment inTurbine Hall of Power Units 1-4; Free released materials; Activities in the Controlled area – relocation of the boron absorber rods and dummy assemblies from the four reactors to the Spent Fuel Pool (SFP-3) with the purpose to reduce the dose budget of the personnel; Schedules, performance, results. Figure.3 Preparation for removal of dummy assemblies, Unit 2, February 2015 • Activities planned – Commissioning of RAW treatment facilities; Commissioning of Size Reduction and Decontamination Workshop; Decontamination of the main equipment and facilities for personal dose reduction; Dismantling of Controlled Area equipment; Management of Radioactive materials and RAW. 3. Conclusions: Performance Analysis, expected difficulties, suggested solutions.