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Kozloduy NPP: the International Project of Nuclear Power Plant Decommissioning is Implemented on the Basis of the Russian BIM — Digital Decommissioning Developed by NEOLANT

03.08.2018

The NEOLANT Group of companies, the developer of the software and hardware package, Digital Decommissioning has completed the first two phases of the Project 44: Development of an equipment dismantling project in the controlled access areas of Kozloduy nuclear power plant, units 1-4.

KozloduyNPP[1].jpg

Facility

The Kozloduy Nuclear Power Plant operates in Bulgaria at the Danube River, some 200 kilometers north of the country's capital of Sofia, and five kilometers east of Kozloduy, the town after which the station is named.

In 1966, the governments of Bulgaria and the former Soviet Union signed an agreement to cooperate on the construction of the Kozloduy plant. Construction began four years later as a joint project of Teploelektroproekt of Moscow and Energoproekt of Sofia.

In 1974, the station began operating with an output 220MWe of electrical power. The Soviet Union and later Russia supplied and handled the nuclear fuel. During the years of 1991 to 2002, the station grew to six power units with a total capacity of 3,760MWe, which covered 45% of country's need for electrical energy.

The Kozloduy plant currently manages two pressurized water reactors, with a total output of 2,000MWe. The older and smaller Units 1 to 4 were shut down by 2007. Units 5 and 6, constructed in 1987 and 1991, are VVER-1000 reactors. As part of a program to extend its life by 30 years, Unit 5 was in 2017 upgraded to a capacity of 1,100MWe. A seventh 1,000 MWe unit may be installed using a reactor from the terminated Belene project, for which Bulgaria paid €600 million.

When Bulgaria candidated for EU membership, it was required to satisfy EU conditions for nuclear plant safety, and so the first four nuclear power units will be decommissioned. The remaining two VVER-1000 reactor units (5 and 6) were successfully upgraded during 2005-2006, and so meet EU safety requirements.


Customer: State Enterprise Radioactive Waste (SE RAW), Republic of Bulgaria

Decommissioning: Russian-German consortium comprising of GC NEOLANT, JSC NIKIMT Atomstroy, NUKEM Technologies GmbH, and EWN GmbH

Period of implementation: 2016-2019

Interesting Fact

Kozloduy is the first nuclear power plant decommissioning in Europe to use information technology to support the back-end stage of nuclear power plant units, thereby increasing the economic and technical significance of the project.

Goal

Project 44: Development of an equipment dismantling project in the controlled access areas of Kozloduy nuclear power plant, units 1-4

As-built 3D model showing Units 1 through 4 of the Kozloduy nuclear power plant
As-built 3D model showing Units 1 through 4 of the Kozloduy nuclear power plant
Generating the equipment list for selected equipment on the premises of Unit 2, the Kozloduy NPP
Generating the equipment list for selected equipment on the premises of Unit 2, the Kozloduy NPP
Visualizing dose rate measurement points on the 3D model of Units 1 through 4, Kozloduy NPP
Visualizing dose rate measurement points on the 3D model of Units 1 through 4, Kozloduy NPP

Results

  • Provided reliable estimates of the amount of radioactive waste generated
  • Acquired up-to-date as-built documentation
  • Systematically arranged and generated all required engineering and technical data at the decommissioning stage, taking into account the duration and turnover of staff
  • Improved and verified the design and process solutions under development
  • Prepared demonstration materials submitted for expert review
  • Created an integrated information database for future coordination, planning, and control of the contractor firms during actual decommissioning activities
  • Trained personnel from the contractor firms
  • Obtained actual data of the design and arrangement of the radioactive waste reprocessing facilities at units 1-4

Implementation

Stage 1. A radiation survey that included the following tasks in Building 1 and the reactor compartment of Unit 1:

  • Taking radiation surveys of all 150 rooms of Building 1 and of the reactor compartment of Unit 1
  • Making spectrometric examinations of all areas to update the existing nuclide vectors
  • Swiping samples from the surfaces of equipment in the premises
  • Undertaking gamma scanning of all areas

Stage 2. The development of 3D engineering and radiation models:

  • Laser scanning of 600 premises in Buildings 1 and 2 and the reactor compartments of Units 1 through 4
  • Digitizing 40,000 project and design documentation pages
  • Creating an as-built model of the 500,000 elements that make up the buildings and reactor compartments

Stage 3. Development of design documentation for dismantlement of systems and equipment of Building 1 and the reactor compartment of Unit 1

Results of gamma-scanning an area of the the Kozloduy NPP nuclear power plant
Results of gamma-scanning an area of the the Kozloduy NPP nuclear power plant
Interactive analyses of elevation marks at the Kozloduy NPP
Interactive analyses of elevation marks atthe the Kozloduy NPP
Report of the inspection of the the Kozloduy NPP premises
Report of the inspection of the the Kozloduy NPP premises
Generating process flow charts of equipment dismantling in premises of NPP Kozloduy Unit 1
Generating process flow charts of equipment dismantling in premises of NPP Kozloduy Unit 1

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