The Bulgarian National Repository for Radioactive Waste

Transcription

1 bulatom Traditional International Nuclear Conference June 4-6, 2014 The Bulgarian National Repository for Radioactive Waste I. Stefanova () E. Biurrun, T. v. Berlepsch (DBE Technology GmbH, Germany) E. González (Westinghouse Electric Spain)

2 Background Bulgaria is developing a near-surface LILW repository for the country s needs in view of the early shutdown of Units 1 to 4 at KNPP, with KIDSF financial support.

3 Milestones of the NDF Development (I) The NDF Project is launched by Resolution 683 of the Council of Ministers of July 15, 2005 BNRA issue a permit for selecting a Repository Site The Radiana Site, adjacent to Kozloduy NPP is selected A Detailed Development Plan is Prepared and approved On January 5, 2011 the Council of Ministers adopt a National Strategy for Management of Spent Nuclear Fuel and Radioactive Waste until 2030

4 Milestones of the NDF Development (II) October 2011: the contract of the development of the NDF Engineering is awarded Resolution 898 of the Council of Ministers of December 8, 2011 declares the NDF a Project of National Importance and National Project On May 4, 2012 the chairman of BNRA signs the NDF Design Permit The NDF Repository Engineering, which includes the Technical Design and ISAR, are being developed since October 2011 ( TD 10,000 pages pages ISAR)

5 The Repository Engineering The Repository Engineering is being developed by the consortium of Westinghouse Electric Spain SAU, DBE Technology GmbH of Germany, and ENRESA, Spain. EQE Bulgaria acts as main local subcontractor

6 The Engineering Phases PHASE I: Development of the Conceptual Design (first 6, than 2 Variants) Selection of a preferred Variant BNRA issue the Design Permit PHASE II: Development of: Technical Design Specification for Construction Intermediate Safety Analysis Report (ISAR) Phase III: Assistance to during the repository licensing

7 RADIANA Site Location

8 RADIANA Site Boundaries

9 NDF Concept and Lifetime

10 NDF Multiple Barrier Design Concept The waste (drums or bulk waste) will be packed into cubicshaped disposal containers made of reinforced concrete with 1.95 m side length and a weight of up to 20 tons The void space in the waste packages will be filled with mortar The waste packages will be disposed of in reinforced concrete cells of 20m x 17m with 50 cm thick walls. Each disposal cell is subdivided into three chambers by two inner walls. Each cell will house 288 packages in four layers The cells will be closed with 25 cm thick precast concrete slabs, standing on the outer and inner walls. On top of the slabs a 60 cm thick reinforced concrete slab will be casted insitu The cells will be finally covered by a multi-layer impermeable cover

11 Repository Cell Design

12 The Two Repository Design Variants

13 Repository Final Cover

14 Artist View of the NDF

15 NDF Disposal Cells

16 Waste Delivery to the NDF for Disposal

17 Disposal Cell During Waste Disposal

18 Preliminary ISAR Results

19 The NDF Engineering Project Schedule Conceptual Design Technical design ISAR Spec for Const. Licensing Process

20 Conclusions I The NDF Technical Design has been updated after review by an Independent Reviewer and by the BNRA The Draft ISAR is being updated after review by the Independent Reviewer and by the BNRA and its Technical Support Organization The Technical Specification for the Tendering Procedure for construction is being finished The cooperation between six partners in three countries and using four languages has been excellent, efficient and successful

21 Conclusions II In spite of the very ambitious time schedule efficient technical solutions were developed A complex, but appropriately safe and viable repository design has been produced Work is currently focussing on producing final documents for approval by the licensing authorities and on the Technical Specification for Construction The Consortium looks forward to continue interacting with the BNRA in the licensing process Construction is due to start in mid-2015

22 Thank you for your kind attention!