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1 Greetings from Serpent Developer Team 5th International Serpent UGM, Knoxville, TN, Oct , 2015 Jaakko Leppänen VTT Technical Research Center of Finland

2 Click to edit Master title Background style Development of Serpent started at VTT in 2004: Click to edit Master text styles homogenization Second level Original idea was to develop a simplified Monte Carlo code dedicated to spatial Calculation Third routines level optimized for reactor physics calculations at the fuel assembly level Fourth level Fifth level Built-in burnup calculation capability implemented in 2008 Public distribution of Serpent started in 2009, and the applications started to diversify along with the growing user community

3 Developer team at VTT: Click Jaakko to edit Leppänen Master (misc. text stuff) styles Second level With: Maria Pusa (CRAM, deterministic solvers for homogenization) Tuomas Third Viitanen level(tms temperature treatment routine) Fourth level Ville Valtavirta (multi-physics coupling) Serpent developer team at VTT Fifth level Toni Kaltiaisenaho (photon transport) Paula Sirén (fusion neutronics, plasma source coupling) Riku Tuominen (multi-physics)

4 User community in numbers: 1 Serpent user community Click 459 registered to edit Master users intext mailing styles list (44% Europe, 40% North America) Second level 142 organizations (54% universities) 36 countries Third level 317 users for Fourth Serpent level2 Typical user: M.Sc. Fifth or level Ph.D. student More than 50 Theses on Serpent-related topics since 2007 almost 300 peer-reviewed journal and conference papers since 2005 Serpent website: Number of registered users Year Serpent discussion forum: 1 Previous UGM in Cambridge: 318 /191 users, 117 organizations, 31 countries

5 Typical applications: Click to edit Master text styles Second level Serpent applications Group constant generation for reactor simulator codes (DYN3D, PARCS, ARES, TRAB3D, HEXTRAN, HEXBU, APROS,...) Research Third reactor level modeling Burnup calculations Fourth level (fuel cycle studies, radioactive inventory and source term calculations) Fifth level Coupled multi-physics applications (coupling to CFD, thermal hydraulics and fuel performance codes) New near-term future applications: Radiation shielding (neutron and photon transport) Fusion neutronics (shut-down dose rate calculations, heat deposition, tritium breeding, material damage and activation)

6 Click to edit Master text styles Second level ii) Coupled Third multi-physics level calculations iii) Source term Fourth and level radiation shielding calculations for dry storage of spent fuel Fifth level iv) Fusion neutronics applications On-going and future work Serpent development is mainly funded by VTT and Finnish national research programmes, and the focus areas reflect the topics of these projects: i) Advanced methods for spatial homogenization In September 2015, an application was submitted to the Academy of Finland for a new project aiming to broaden the scope of applications: Radiation shielding problems related to the back-end of the fuel cycle Transport applications in fusion research High-energy particle transport simulations in space applications Radiotherapy and medical imaging

7 Recently implemented features: 2 Click to edit Master text styles Second level On-going and future work Photon interaction physics completed (2.1.24) Radioactive decay source and photon dose rate detectors (2.1.24), pulse-height detector Third (2.1.25) level On-the-fly and Fourth preprocessor level interpolation of S(α,β) thermal scattering data (2.1.24) Fifth level Better compatibility with MCNP geometry inputs: new surface types, complement operator # in cell surface lists (2.1.25) 3 Major improvements in STL geometry types ( ) Coupling algorithms for multi-physics calculations ( ) 2 Current update is , distributed on June 25, # cannot be used as a comment character from update on.

8 On-going work on new features: Click to edit Master text styles Second level Continuous reprocessing for MSR s Collision history based adjoint methodology Delayed Third neutron levelmodel in dynamic mode Fourth level Coupling of plasma simulation codes to neutron source routine Fifth level On-going and future work Weight-window mesh based variance reduction Near future: Expanding homogeneous diffusion flux solver to 3D Optimization of automated branch calculations to cluster (MPI) parallelization Expanding TMS to unresolved resonance range

9 On-going and future work Click to edit Master text styles Second level Third level Fourth level Fifth level Emission rate (1/s) Photon energy (MeV) Figure 1 : Demonstration of recently-implemented features: photon shielding calculations in a CASTOR spent fuel cask. Left: STL model of the cask. Center: Serpent geometry plot showing spent fuel assemblies loaded inside the cask. Right: Photon emission spectrum provided by the radioactive decay source.

10 -50 Click to edit Master text styles 0 Second level y-dimension (cm) 50 Third level 100 Fourth level y-dimension (cm) On-going and future work Fifth x-dimension level (cm) y-dimension (cm) y-dimension (cm) x-dimension (cm) x-dimension (cm) x-dimension (cm) Figure 2 : Comparison of results from analog (top row) and weight-window based (bottom row) simulation of photon transport in CASTOR spent fuel cask. Left column: photon flux, Right column: figure-of-merit (σ 2 T 1 )

11 Public release of Serpent 2 and commercial use The public (OECD/NEA and RSICC) distribution of Serpent 2: Click to edit Master text styles Second level Already delayed for several years and will be delayed at least until 2016 On-line Wiki type manual to be started soon Processing Third of level new cross section libraries starting in late 2015 Fourth level Commercial user license: Fifth level Current license agreement allows Serpent to be used for non-commercial research educational purposes only Code is not ready for full commercial use (no quality standard, no manual, validation incomplete, no resources for training courses or technical support) A temporary commercial license effective until the end of 2017 has been drafted with VTT s legal department Should be available by the end of 2016

12 Click to edit Master text styles Second level 2012 Madrid, Spain 3 days, 40 participants, 20 presentations 2013 Berkeley, Third level USA 3 days, 35 participants, 24 presentations Fourth level 2014 Cambridge, UK 3 days, 34 participants, 24 presentations Fifth level Serpent UGM 2015 Previous International Serpent User Group Meetings: 2011 Dresden, Germany 2 days, 33 participants, 16 technical presentations This meeting: days, 41 participants, 28 presentations 30 minutes reserved for presentation, questions and discussion, but the schedule is flexible Presentations collected at a website after the meeting (send pdf to Jaakko.Leppanen@vtt.fi)

13 Serpent UGM 2015 Click to edit Master title style Click to edit Master text styles Second level Third level Fourth level Fifth level Remember group photo on Thursday, before the technical tour. Group photos from previous International Serpent User Group Meetings: Dresden, 2011; Madrid, 2012; Berkeley, 2013; Cambridge 2015.

14 Enjoy the 5th International Serpent User Group Meeting! Click to edit Master text styles Second level Third level Fourth level Fifth level

15 TECHNOLOGY FOR BUSINESS