And Intermediate-Level Radioactive Waste, Stationary Facilities for The

And Intermediate-Level Radioactive Waste, Stationary Facilities for The

Statement of the Nuclear Waste Management Commission, revised version of 18.10.2013 Note: This is a translation of the statement entitled “ESK-Stresstest für Anlagen und Einrichtungen der Ver- und Entsorgung in Deutschland Teil 2: Lager für schwach- und mittelradioaktive Abfälle, stationäre Einrichtungen zur Konditionierung schwach- und mittelradioaktiver Abfälle, Endlager für radioaktive Abfälle”. In case of discrepancies between the English translation and the German original, the original shall prevail. E S K STATEMENT of the Nuclear Waste Management Commission (ESK) ESK stress test for nuclear fuel cycle facilities in Germany* Part 2: Storage facilities for low- and intermediate-level radioactive waste, stationary facilities for the conditioning of low- and intermediate-level radioactive waste, disposal facilities for radioactive waste STATEMENT Revised version of 18.10.2013 Compared to the original version of 11.07.2013, an incorrect statement was corrected in Chapter 5.6, second last bullet point: company Eckert & Ziegler Nuclitec GmbH does not operate a storage facility at the Braunschweig site. ________________________ *Translator’s note: In the German original, the terms "Anlage" and "Einrichtung" are used. Both terms are translated by "facility" since, in this Statement, reference is always made to a facility of the nuclear fuel cycle (NFCF). Contents 1 Background information and request for advice ................................................................................. 3 2 Consultations ....................................................................................................................................... 4 3 General approach ................................................................................................................................ 4 4 Approach in particular ........................................................................................................................ 5 5 Storage facilities and conditioning facilities for low- and intermediate-level waste .......................... 6 5.1 Questions in the ESK stress test .......................................................................................................... 6 5.2 Assessment criteria ............................................................................................................................. 8 5.3 Description of the storage facilities and conditioning facilities for low- and intermediate-level waste ................................................................................................................................................... 9 5.4 Damage pattern types ........................................................................................................................ 11 5.4.1 Description of damage pattern types ................................................................................................. 11 5.4.2 Derivation of package inventory types ............................................................................................. 13 5.4.2.1 Waste in storage facilities from operation, decommissioning and dismantling of nuclear power plants and research reactors .............................................................................................................. 14 5.4.2.2 Radioactive waste in Land collecting facilities, from isotope production and from nuclear industry.............................................................................................................................................. 14 5.4.2.3 Radioactive waste in conditioning facilities ..................................................................................... 15 5.4.2.4 Summary of package types, activity inventories and nuclide vectors ............................................... 16 RSK/ESK Secretariat at the Federal Office for Radiation Protection Page 1 of 65 Statement of the Nuclear Waste Management Commission, revised version of 18.10.2013 5.4.3 Assessment of potential releases on the basis of the derived release fractions of the different package types .................................................................................................................................... 16 5.4.3.1 Release fractions of the different waste packages ............................................................................. 17 5.4.3.2 Thermal impact ................................................................................................................................. 18 5.4.3.3 Mechanical impacts ........................................................................................................................... 19 5.4.3.4 Flooding for ten days ........................................................................................................................ 21 5.4.3.5 Tidal wave through the storage building ........................................................................................... 22 5.4.4 Determination of radiation exposure due to potential releases ......................................................... 23 5.4.4.1 Model sites ........................................................................................................................................ 23 5.4.4.2 Determination of radiation exposure ................................................................................................. 24 5.4.4.3 Assessment of the radiation exposure determined for the damage pattern types and model sites .... 26 5.5 Conclusions ....................................................................................................................................... 27 5.6 Summary assessment and recommendations with regard to storage facilities for low- and intermediate-level radioactive waste and conditioning facilities ...................................................... 27 6 Disposal facilities for radioactive waste............................................................................................ 30 6.1 Questions in the ESK stress test ........................................................................................................ 31 6.2 Disposal facilities considered in the stress test ................................................................................. 32 6.2.1 Asse II mine repository ..................................................................................................................... 32 6.2.2 Morsleben repository for radioactive waste (ERAM) ....................................................................... 32 6.2.3 Konrad mine repository .................................................................................................................... 33 6.3 Summary assessment and recommendations with regard to the disposal facilities .......................... 34 7 References ......................................................................................................................................... 35 Annex 1 (editorially revised version of 30.7.2013) .......................................................................................... 59 RSK/ESK Secretariat at the Federal Office for Radiation Protection Page 2 of 65 Statement of the Nuclear Waste Management Commission, revised version of 18.10.2013 1 Background information and request for advice The earthquake off the Japanese coast on 11.03.2011 and the subsequent flooding caused by a tsunami triggered a nuclear disaster at the Fukushima site. Although the initiating events of the nuclear disaster in Japan, especially the magnitude of the earthquake and the height of the tidal wave, are not directly applicable to conditions in Europe and Germany, the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) considers it necessary, as a consequence of these events, to not only perform a robustness assessment for German nuclear power plants, but also a stress test for spent fuel and radioactive waste management facilities in Germany. Against this background, the BMU commissioned the NUCLEAR WASTE MANAGEMENT COMMISSION (ESK) by letters dated 22.06.2011 [1] and 18.07.2011 [2] to develop appropriate review concepts for facilities in operation or under construction for the treatment, storage and disposal of spent fuel, heat-generating and other types of radioactive waste and for the plants for uranium enrichment in Gronau and fuel fabrication in Lingen. These types of facilities are all facilities serving the purpose of fuel supply or waste management. There are also other facilities in which radioactive materials are handled, e.g. for research or the production of isotopes. These facilities are not included in the request for advice to the ESK and have therefore not been considered in the statements of the ESK on the stress test. For a better structuring of its approach, the ESK applied an internal classification of the facilities according to different categories. With its statement of 14.03.2013 [3], the ESK already assessed the robustness of nuclear fuel supply facilities, storage facilities for spent fuel and heat-generating radioactive waste and facilities for the treatment of spent fuel against beyond design basis events. In this second part, the ESK assesses the robustness of storage facilities and conditioning facilities for low- and intermediate-level radioactive waste and disposal facilities for radioactive waste (Asse II mine, Morsleben repository for radioactive waste (ERAM) and the Konrad mine repository). In order to ensure separation

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