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3 Description of the Nuclear Facilities at Risø National Laboratory Downloaded from orbit.dtu.dk on: Oct 04, 2021 Decommissioning of the nuclear facilities at Risø National Laboratory. Descriptions and cost assessment Lauridsen, K. Publication date: 2001 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Lauridsen, K. (2001). Decommissioning of the nuclear facilities at Risø National Laboratory. Descriptions and cost assessment. Risø National Laboratory. Denmark. Forskningscenter Risoe. Risoe-R No. 1250(EN) General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Risø-R-1250(EN) Decommissioning of the Nuclear Facilities at Risø National Laboratory Descriptions and Cost Assessment Edited by Kurt Lauridsen Risø National Laboratory, Roskilde, Denmark February 2001 Abstract The report is the result of a project initiated by Risø National Laboratory in June 2000 on request from the Minister of Research and Information Technology. It describes the nuclear facilities at Risø National Laboratory to be decommissioned and gives an assessment of the work to be done and the costs incurred. Three decommissioning scenarios were consid- ered with decay times of 10, 25 and 40 years for the DR 3 reactor. The assessments conclude, however, that there will not be much to gain by allowing for the longer decay periods; some operations still will need to be performed remotely. Furthermore, the report describes some of the legal and licensing framework for the decommissioning and gives an assessment of the amounts of radioactive waste to be transferred to a Danish repository. ISBN 87-550-2844-6; 87-550-2846-2 (Internet) ISSN 0106-2840 Print: Danka Services International A/S, 2001. Decommissioning of Risø's nuclear facilities. Descriptions and cost assessment. Contents 1 Introduction ...................................................................................................................................... 7 2 General aspects of decommissioning................................................................................................ 9 2.1 Phases of decommissioning.......................................................................................................... 9 2.2 Decommissioning strategies......................................................................................................... 9 2.3 Legal aspects in Denmark .......................................................................................................... 10 3 Description of the nuclear facilities at Risø National Laboratory .................................................. 11 3.1 DR 1........................................................................................................................................... 12 3.1.1 General description................................................................................................................ 12 3.1.2 Activity inventory.................................................................................................................. 15 3.2 DR 2........................................................................................................................................... 16 3.2.1 General description................................................................................................................ 16 3.2.2 Activity inventory.................................................................................................................. 24 3.3 DR 3........................................................................................................................................... 27 3.3.1 General description................................................................................................................ 27 3.3.2 Activity inventory.................................................................................................................. 34 3.4 Fuel fabrication facility .............................................................................................................. 39 3.4.1 General description................................................................................................................ 39 3.4.2 Activity inventory.................................................................................................................. 39 3.5 Isotope laboratory....................................................................................................................... 40 3.5.1 General description................................................................................................................ 40 3.5.2 Activity inventory.................................................................................................................. 42 3.6 Hot Cells..................................................................................................................................... 43 3.6.1 General description................................................................................................................ 43 3.6.2 Activity inventory.................................................................................................................. 45 3.7 Waste management plant and storage facilities.......................................................................... 48 3.7.1 General description................................................................................................................ 48 4 Relevant experience from other countries ...................................................................................... 55 4.1 Germany..................................................................................................................................... 55 4.1.1 Forschungszentrum Karlsruhe ............................................................................................... 55 4.2 Switzerland................................................................................................................................. 57 4.2.1 Paul Scherrer Institut (PSI).................................................................................................... 57 4.3 United Kingdom......................................................................................................................... 59 4.3.1 UKAEA Harwell ................................................................................................................... 61 4.4 International organisations ......................................................................................................... 63 5 The approach to cost assessment .................................................................................................... 64 5.1 Scenarios considered .................................................................................................................. 64 5.2 General assumptions................................................................................................................... 66 5.3 Method used for cost assessment ............................................................................................... 66 5.4 Limitations of the study.............................................................................................................. 68 6 Detailed description of the decommissioning work to be done at each facility ............................. 69 6.1 Decommissioning DR 1 ............................................................................................................. 69 6.1.1 Operations to be performed ................................................................................................... 69 6.1.2 Necessary manpower............................................................................................................. 69 6.1.3 Special equipment needed ..................................................................................................... 70 6.1.4 Radiation doses to be expected.............................................................................................. 70 6.1.5 Other safety related aspects ................................................................................................... 70 6.1.6 Amounts of radioactive waste produced and its treatment .................................................... 70 6.1.7 Documentation to be produced.............................................................................................. 70 6.1.8 Assessment of the costs ......................................................................................................... 70 6.1.9 Uncertainties in the assessments............................................................................................ 70 6.2 Decommissioning DR 2 ............................................................................................................. 71 6.2.1 Operations to be
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