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Anna Ferrari MAXSIMA Meeting, 27 November 2013 1 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari HZDR FLUKA activities in support of the MYRRHA Project.

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Presentation on theme: "Anna Ferrari MAXSIMA Meeting, 27 November 2013 1 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari HZDR FLUKA activities in support of the MYRRHA Project."— Presentation transcript:

1 Anna Ferrari MAXSIMA Meeting, 27 November 2013 1 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari HZDR FLUKA activities in support of the MYRRHA Project Short summary with a focus on activation problems Anna Ferrari, Stefan Müller, Jörg Konheiser Helmholtz-Zentrum Dresden-Rossendorf

2 Anna Ferrari MAXSIMA Meeting, 27 November 2013 2 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari MAXSIMA Framework of this work: CDT-FASTEF + MAXSIMA EU FP7 projects Goal: design a FAst Spectrum Transmutation Experimental Facility, able to demonstrate efficient transmutation of high level waste able to demonstrate efficient transmutation of high level waste and associated technology and associated technology A look at the MYRRHA project Heart of the MYRRHA facility at SCK·CEN in Mol Heart of the MYRRHA facility at SCK·CEN in Mol FASTEF + The MYRRHA construction could start in few (?) years MAXSIMA design (planned to be operational in 2023) Heart of the MYRRHA facility at SCK·CEN in Mol Heart of the MYRRHA facility at SCK·CEN in Mol FASTEF + The MYRRHA construction could start in few (?) years MAXSIMA design (planned to be operational in 2023) In MYRRHA ( Multi-purpose hybrid research reactor for high-tech applications) :  A LFR (Lead Fast Reactor) will operate both in critical and subcritical mode. Core power - 100 MW in critical mode in the FASTEF design: - 94 MW in subcritical mode  An Accelerator Driven System with a 600 MeV proton beam will be provided by a LINAC  A Compact Spallation Target will be provided, in LBE (Lead Bismuth Eutectic)

3 Anna Ferrari MAXSIMA Meeting, 27 November 2013 3 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari 600 MeV Proton beam-line Target window zone Beam spot centre movement Reactor Spallation target LINAC tunnel Beam Dump Casemate The general shielding problem up to 4 mA current Analysis around the accelerator in: A. Ferrari, J.-L. Biarrotte et al., SATIF-11 Conf. Proc., OECD/NEA Nuclear Science 7157, 13-27 (2013)

4 Anna Ferrari MAXSIMA Meeting, 27 November 2013 4 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari Goal: Neutronics, shielding and activation analysis in support of the safety Key points: - Detailed characterization of the shielding and of the activation problems around the accelerator and around the core in both subcritical/critical modes - Definition of the shielding structures in the building areas not yet optimized (ex. Cover, Vertical containment beyond the 90  magnet) - Find activation problems that can have an impact on the design Key points: - Detailed characterization of the shielding and of the activation problems around the accelerator and around the core in both subcritical/critical modes - Definition of the shielding structures in the building areas not yet optimized (ex. Cover, Vertical containment beyond the 90  magnet) - Find activation problems that can have an impact on the design Method for the reactor analysis: combined use MCNPX and FLUKA. - MCNPX is the official tool used to characterize the MYRRHA cores - FLUKA allows to evaluate the dose rates due to the activated materials and with the real geometry Method for the reactor analysis: combined use MCNPX and FLUKA. - MCNPX is the official tool used to characterize the MYRRHA cores - FLUKA allows to evaluate the dose rates due to the activated materials and with the real geometry

5 Anna Ferrari MAXSIMA Meeting, 27 November 2013 5 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari The CDT model of the reactor containment system (ANSALDO) Hot LBE (350  ) Argon AISI 316L Concrete Hot LBE (350  ) with SS content Argon with SS content Nitrogen

6 Anna Ferrari MAXSIMA Meeting, 27 November 2013 6 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari The new MAXSIMA model

7 Anna Ferrari MAXSIMA Meeting, 27 November 2013 7 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari Components included in the model for MAXSIMA: Reactor vessel Reactor diaphragm Reactor cover Above core structures (ACSs) Primary pumps Primary heat exchangers In-vessel fuel handling machines Window target Silicium doping

8 Anna Ferrari MAXSIMA Meeting, 27 November 2013 8 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari Argon Analyzed irradiation pattern: Medium term operation  1 cycle 90 d continuous irradiation, 1 week cooling Production of Ar-37 (t 1/2 = 35 d) by neutron capture from Ar-36 H*(10) rate (  Sv/h) Nitrogen Production of C-14 (t 1/2 = 5700 y) by fast neutron activation from N-14 Residual activity in argon:  26 Bq/cm 3 Residual activity in nitrogen:  0.3 Bq/cm 3 A comparison Argon/Nitrogen as plenum gas: residual radiation

9 Anna Ferrari MAXSIMA Meeting, 27 November 2013 9 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari RN contribution to the total specific activity [Bq/cm3]- EOI 15 y Activation of the T91 window (FLUKA simulation) T91 samplesSpecific activity [Bq/cm3] EOI 90 days cooling 1 week EOI 5 years cooling 30 days EOI 15 years cooling 1 year Exit window4.50E+121.73E+126.95E123.28E+127.88E+122.34E+12 Hexagonal tube (central part) 2.91E+111.29E115.95E113.74E+11 6.70E+112.89E+11 Neutron fluence rate (n/cm 2 per s)

10 Anna Ferrari MAXSIMA Meeting, 27 November 2013 10 FLUKA Collaboration Meeting, 16.12.2014 Anna Ferrari  In the frame of the European Projects CDT and MAXSIMA we widely used FLUKA to cope with activation problems. In the reactor analysis, a coupling MCNPX/FLUKA allowed us to perform calculations around the reactor core, which had an impact on the design  ANSALDO is a fundamental partner in the MYRRHA Project. We had a fruitful collaboration in CDT and MAXSIMA ANSALDO is now in charge of the activation calculations for the MYRRHA Project (and not only!) and joined the community of the FLUKA users


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