1 FTP/P1-35 IFMIF: Overview of the Validation Activities and of the Engineering Design Activities J. Knaster 1 , H. Matsumoto 1 , R. Heidinger 2 , M. Sugimoto 3 , A. Ibarra 4 , A. Mosnier 2 , F. Arbeiter 5 , P. Favuzza 6 , G. Micciche 6 , V. Heinzel 5 , F.S. Nitti 2 , P. Cara 2 , S. Chel 7 , A. Facco 8 , V. Massaut 9 , N. Baluc 10 , J. Theile 10 1 IFMIF/EVEDA Project Team, Rokkasho, Japan, 2 F4E, Garching, Germany, 3 JAEA, Rokkasho, Japan, 4 CIEMAT, Madrid, Spain, 5 KIT, Karlsruhe, Germany, 6 ENEA, Brasimone, Italy, 7 CEA, Saclay, France, 8 INFN, Legnaro, Italy, 9 SCK-CEN, Mol, Belgium, 10 CRPP Lausanne, Switzerland E-mail contact of main author: roland.heidinger@ifmif.org Abstract. The Engineering Validation and Engineering Design Activities for the International Fusion Materials Irradiation Facility (IFMIF) are entering into the conclusive stages. By July 2013, the engineering design of IFMIF will be completed by delivering an Intermediate IFMIF Engineering Design Report (IIEDR) supported by experimental results from the majority of the validation activities. A major role is attributed to the Accelerator Prototype (LIPAc) validation activities for which installation of sub-subsystems at the Rokkasho BA Site will start in early 2013 and for which, after the testing of the sub-systems, the installation and commissioning programme will extend till June 2017. 1. Introduction The International Fusion Materials Irradiation Facility (IFMIF) is projected to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity and irradiation volume to simulate as closely as possible the first wall neutron spectrum of future nuclear fusion reactors such as DEMO and Power Plants [1]. The International Fusion Materials Irradiation Facility Engineering Validation and Engineering Design Activities (IFMIF/EVEDA), which started in 2007 under the framework of the Broader Approach (BA) Agreement between Japan and EURATOM, are entering into the conclusive stages [2,3]. By July 2013, the engineering design of IFMIF will be completed by delivering an Intermediate IFMIF Engineering Design Report (IIEDR) supported by experimental results from the majority of the validation activities [4,5]. An overview of the engineering design is reported here together with the outcome of the validation activities already achieved and still expected. Particular emphasis is given to the Accelerator Prototype (LIPAc) validation activities for which installation of sub-subsystems at the Rokkasho BA Site will start in early 2013 and for which after the testing of the sub- systems, the installation and commissioning programme will extend till June 2017. 2. Engineering Design of IFMIF The Engineering Design Activities in IFMIF/EVEDA are progressing in three specific stages (Facility/System identification and design requirements, Subsystem definition, Design Integration) towards issuing the Intermediate IFMIF Engineering Design Report (IIEDR) by June 2013 that describes a comprehensive and fully integrated engineering design of the