activity of fusion neutronics sub-task from october 2000 to september 2001
DESCRIPTION
Activity of Fusion Neutronics Sub-task from October 2000 to September 2001. Presented by Takeo Nishitani Leader of the Fusion Neutronics Sub-task ExCo of IEA Fusion Reactor Nucl. Technology Baden-Baden, Germany, 19th October, 2001. Major contribute in this sub-task. European Community - PowerPoint PPT PresentationTRANSCRIPT
Activity of Fusion Neutronics Sub-task from October 2000 to September 2001
Presented by Takeo NishitaniLeader of the Fusion Neutronics Sub-task
ExCo of IEA Fusion Reactor Nucl. Technology
Baden-Baden, Germany, 19th October, 2001
Major contribute in this sub-task
European Community FZK, TU Dresden, UP Madrid, ENEA frascati
Japan JAERI and Osaka University
USA UCLA, et al.
Russia Kurchatov, et al.
Fusion Neutronics Activity at JAERI from October 2000 to September 2001
Breeding Blanket Experiments Shielding benchmark experiments
Shutdown dose measurements Double bent duct streaming experiment Decay heat measurements
Activation Experiments for Sequential Charged Particle Reactions
Development of Neutron Measurement Technique Development of Artificial Diamond Detector Development of Micro Fission Chamber for ITER
A schematic view of FNS blanket experiments
FNS 80deg. D-T target
A blanket assembly
Detectors (NE213)
Shielding (Li2CO3)
Breeding Blanket ExperimentsTo verify the nuclear performances of resent designed thermal blankets.
Preliminary Result
We have obtained the profile of reaction rates of the iron, chromium and tungsten in F82H and tritium production in 95-% Li2TiO3.
C/E of the 95-% Li2TiO3 tritium production is closed to 1 with the error of plus and minas 10%.
However, since experimental result of activities of Au foil in Be is significantly underestimated, The investigation of the cause is in progress.
The profiles of reaction rates at the assembly
Shutdown dose measurements
Cross sectional view of the assembly Comparison of shutdown dose rates
Shutdown dose rates can be evaluated by the new one step method within experimental error (~10%)
D-T source Test region
Shield(SS316/H20)
Source Reflector(SS316)
120
0φ
300
20080
0φ
356#A#B #C
#a #b #c
Reflector(SS316)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
1.0E+05 3.0E+05 5.0E+05 7.0E+05 9.0E+05 1.1E+06 1.3E+06 1.5E+060.5
1.0
1.5
2.0
2.5
3.0
3.5
1.0
Cooling time (x 105sec)
Shut
dow
n do
se ra
te(
Sv
/hr)
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
3.5
3.0
2.5
2.0
1.5
1.0
0.53.0 7.0 9.0 11.0 13.0 15.05.0
FENDL/2AFENDL/2
#A
#a
Double bent duct streaming experiment
Typical streaming effects can be reproduced by MCNP & FENDL/2 (~30%)
Cross sectional view of the assembly Comparison of neutron spectrum
Iron Rack
Auxiliary Shield
Streaming Assembly
Auxiliary Shield
1800200
800
1000 900 Duct Opening
(300 x 300)
DT Source
1700
1200
550750
765
335
565
150
#1 #2 #3
#4 #5
#6
1.0E-12
1.0E-11
1.0E-10
1.0E-09
1.0E-08
1.0E-07
1.0E-06
1.0E-05
1.0E-04
1.0E+00 1.0E+01 1.0E+02
Energy (MeV)
Ne
utr
on
flu
x (n
/cm
2 /so
urc
e/le
tha
rgy)
Calculation
Experiment #3
#4
#5
#6
Development of Artificial Diamond Detector
Recently, we tried to use a chemical vapor deposition (CVD) diamond with single crystal.
The detector has an energy resolution of 0.4 % for 5.486 MeV particles, which gives us a good prospect to the 14 MeV neutron spectrometer using a single crystalline CVD diamond.
1.0 mm(a) 1.0 mm(b)
0
100
200
300
400
500
750 775 800 825 850Channel number
5.486 MeV particles
0.4 %
CVD diamond
Single crystallinePolycrystalline
Future Plan in Fusion Neutronic at FNS/JAERI
Extend of Breeding Blanket Experiments Breeder and Beryllium pebbles
Activation Experiments for Sequential Charged Particle Reactions
Development of Neutron Measurement Technique Development of Neutron Detector using Optical
Fiber Development of Artificial Diamond Detector
Fusion Neutronics Activity at Osaka Universityin 1999-2000
Differential experiments: Charged particle emission DDX Gamma-ray production cross section (n,2n) reaction cross section with a beam
source Integral experiments:
Leakage gamma-ray spectra from slabs Secondary gamma-ray skyshine
Measurements of double differential cross sections for charged particle emission reactions by 14 MeV neutrons.
Samples:natSi and 19F Facility:OKTAVIAN, pulsed neutrons Method:2-dimensional analysis of energy
and time-of-flight (E-TOF) Compound samples were successfully
employed for light element measurements Agreement is not good with the
evaluated nuclear data for both elements.
The DDX and EDX data for The DDX and EDX data for 1919F(n,xp) reactionF(n,xp) reaction
Measurements of secondary gamma-ray production cross sections with Hp-Ge detector induced by 14 MeV Neutrons.
Samples:natSn Facility: OKTAVIAN, pulsed neutrons Method: TOF-gated PHS analysis Discrete and continuum components were successfully ext
racted from the measured pulse height spectrum (PHS) with Hp-Ge (the results were still preliminary).
The present data are the first measured discrete gamma-ray production cross sections for natSn.
(n,2n) reaction cross section measurement with a beam DT neutron source
For 55Mn, the measured (n,2n) cross section was in good agreement with the experimental value obtained by the activation method.
Samples:55Mn (to check the system) Facility:FNS, pencil beam neutrons The method to directly measure
the spectra of two neutrons emitted
from (n,2n) reaction has been
established.
Fusion neutronics benchmark experiment - leakage gamma-ray spectrum measurement -
Samples:LiAlO2, Li2TiO3, Li2ZrO3 12C, 51V, natFe, natCu, natPb, natW, Facility:FNS, pulsed neutrons Result:
natV: Underestimation of all the nuclear data files.natFe: Overestimation of JENDL -3.2.natPb: Reproduction is not good for JENDLs16O: 6 MeV peak is not reproduced by JENDLs.
Secondary gamma-ray skyshine from 14 MeV neutron source facility
Facility: FNS, DC neutrons ( ~ 1x1011) Detector: NaI(5”x5”,8”x8”), Hp-Ge(40%) Clean skyshine benchmark data can be obtained up to 1000
m from the neutron source. Preliminary experiment has been done under the plug-in co
ndition (the plug is just above the source and on the ceiling) at 140 m from the facility.