T5/EURISOL-DS Work Progress Meeting Participation of NIPNE-Bucharest (Romania) •
Sub-Task A: Radiation, activation, shielding & doses Neutron attenuation calculations: comparison with data Simulations with FLUKA: - HIMAC benchmarck - basic shielding studies
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Sub-Task B: Radioactivity control, safety and risks – Dispersion of radio-elements, contamination, migration: experience gained from NPPs - 1st version of an integrated software platform available on CD - - current work: implemantation of calculation of Derived Released Limits -----------------------------------------------------------------------------------------------------------Budget in 2nd year: - spent in 4 months: 3 k€ - estimation for the rest of year (8 months): 8 k € Personnel in 2nd year: - with EC contribution: Bogdan Vamanu from (01.feb.2006-…) - total effort: 0.8 man*years (during 4 months) 1.6 man*years (estimation for 8 months)
------------------------------------------------------------------------------------------------T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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Monte Carlo code Validation • Attenuation of high energy secondary neutrons (20-800)MeV produced by: 12C ions (400MeV/nucleon) on Cu target (HIMAC- benchmarck experiment –from SINBAD/NEA ) 1
1
Geometry lay-out 1further Shielding Materials:
• Iron layers (20-100)cm thickness • Concrete layers (50-250) cm thickness
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmark - geometry lay-out
SELF-TOF detector configuration
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmark - geometry lay-out
NE-213 detector configuration
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmark - geometry lay-out Bi & C activation detector configuration
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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Monte Carlo simulation set-up FLUKA– interaction and transport code 1
Physical models*
-PEANUT event generator (hadron-nucleus interactions)
-RQMD & DPMJET-II external event generator (nucleus-nucleus interaction) 1 Geometry models - used by MCNPX in the Benchmark 1
Shielding Materials
• •
Iron (Density 7.87 g/cm3) Concrete (Density 2.27 g/cm3) [Type 02-a, ANL-5800, 660(1963)]
1
Biasing
- Russian roullete and splitting at boundary crossing based on region relative importance -Region-dependent weight window in three energy ranges to minimize weight fluctuations • Transport cut-off energy set at 19.6MeV for high energy account
1
Scoring
USRBDX –surface current estimator –Self-TOF detector; USRTRX –track length estimator – NE-213 and activation detectors
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006 * Fasso, A, Ferrari, A, Ranft, J, Sala P.R. Status and Proscpective for Hadronic Applications, Proceeding of the Monte Carlo 2000 Conference, Lisbone October 2000, Springler -Verlag Berlin
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HIMAC benchmarck –RESULTS Neutron energy spectra penetrating through IRON shields
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmarck –RESULTS Neutron energy spectra penetrating through CONCRETE shields
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmarck –RESULTS Attenuation profiles of neutron fluences –IRON shields S-TOF t(cm) 0 20 40 60 80 100
Experiment 4.338 2.329 0.603 0.161 0.045 0.018
FLUKA C/E 6.260 1.44 2.140 0.92 0.627 1.04 0.216 1.35 0.068 1.50 0.027 1.51
NE-213_(pos.A) t(cm) Experiment FLUKA C/E 20 6.544 5.440 0.83 40 2.084 2.214 1.06 60 0.738 0.845 1.14 80 0.359 0.383 1.06 100 0.122 0.132 1.08
Attenuation length of the neutron fluence
λ12 (g cm-2):
Experiment
FLUKA
C/E
Self-TOF
123.0
136.52
1.1
NE-213 (A)
160.5
168.88
1.05
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmarck –RESULTS Attenuation profiles of neutron fluences –Concrete shields S-TOF t(cm) 50 100 150 200
Exp 2.526 0.655 0.174 0.047
FLUKA C/E 2.142 0.848 0.712 1.087 0.302 1.738 0.120 2.540
NE-213_(pos.A) t(cm) 50 100 150 200
Exp FLUKA 4.002 5.02 1.840 2.05 0.680 0.83 0.155 0.30
C/E 1.26 1.12 1.22 1.97
Attenuation length of the neutron fluence λ12 (g cm-2): Experiment FLUKA C/E Self-TOF
86.9
104.71
1.2
NE-213 (A)
124.4
121.40
0.98
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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HIMAC benchmarck –RESULTS Bi & C activation detector configuration
t(cm)
Exp
FLUKA
C/E
50
93.908
8.216
0.087
100
23.127
2.772
0.12
150
7.794
1.090
0.14
200
2.336
0.389
0.166
250
0.630
0.138
0.218
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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Conclusions •
Applicability of FLUKA Monte Carlo simulation in the design of biological shield of the high intensity neutron sources has been investigated;
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Comparison of simulation results are in generally good agreement with experimental data except for the activation detector configuration where discrepancies in the supplied information has been found;
•
Technique developed can be easily extended to design studies of other installation components
T5/EURISOL-DS Work Progress Meeting, Warsaw 5-6June, 2006
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