Overview of Fusion Neutronics Activities at JAERI/FNS
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Overview of Fusion Neutronics Activities at JAERI/FNS in 2004. Presented by T. NISHITANI Japan Atomic Energy Research Institute, Tokai-mura, 319-1195, Japan IEA Fusion Neutronics Subtask Workshop Sala del Consiglio, the Giorgio Cini Foundation, Venice 21th September 2004.

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Overview of Fusion Neutronics Activities at JAERI/FNS in 2004

  • Presented by T. NISHITANI

  • Japan Atomic Energy Research Institute, Tokai-mura, 319-1195, Japan

  • IEA Fusion Neutronics Subtask Workshop

  • Sala del Consiglio, the Giorgio Cini Foundation, Venice

  • 21th September 2004


Verification of Tritium Production through Integral Experiments on the Mock-up

REALITY

SIMULATION

Blanket Module

Blanket Mock-up

Two Breeder Layers

Sandwiched by Be

One Breeder Layer

Behind the Fist Wall

Bulk Beryllium

Assembly

Reactor Spectrum

Two main components:

I. High Energy 1n0 from D-T Plasma

II. Low Energy Backward Scattering 1n0

  • Source Spectrum

  • Point D-T Source;

  • Point D-T Source with a Reflector;



Experiment on the Bulk Beryllium Assembly Experiments on the Mock-up

 628 mm

355.6 mm


Experiments on the One-Breeder Layer Blanket Mock-up -- TPR-6 data --

Source Reflector, SS316

Assembly Encloser, SS316

F82H (16) / Li2TiO3 (12) / Be (200)


Experiments on the One-Breeder Layer Blanket Mock-up with W Armor

Source Reflector, SS316

Assembly Encloser, SS316

W (12.6) / F82H (16) / Li2TiO3 (12) / Be (200)


Experiment on the Mock-up with Two-Breeder Layers Sandwiched by Beryllium

TPR-6, 1/6Li nucl./s.n.

Li2TiO3 (12) / Be (100)


The jaerri fns activity for tritium benchmark measurement
The JAERRI/FNS activity for tritium benchmark measurement by Beryllium

We obtained the complete result of tritium benchmark by means of HTO sample.

Results of tritium b-ray counting (Bq/g) in used HTO samples


The jaerri fns activity for tritium benchmark measurement1
The JAERRI/FNS activity for tritium benchmark measurement by Beryllium

As the next step, JAERI/FNS carried out the D-T neutrons irradiation by means of the 6Li and 7Li enriched pellets.

Schematic drawing of Li-7 enrichedLi2CO3 irradiation experiments with JAERI/FNS

Schematic drawing of Li-6 enrichedLi2CO3 irradiation experiments with JAERI/FNS

We obtained preliminary results of the tritium activities (Bq/cc) in the irradiated pellets. We will discuss the results in depth within this conference term.


Differential cross section measurement of n cp reaction collaborating with osaka university
Differential cross section measurement of (n,CP) reaction by Beryllium collaborating with Osaka University

Experimental chamber

Neutron

beam

Schematic view of JAERI/FNS D-T neutron beam assembly and the experimental chamber.


Differential cross section measurement of n cp reaction

15 deg by Beryllium

30 deg

Evaluated value

45 deg

qlab= 70 deg

Differential cross section measurement of (n,CP) reaction

We obtained the DDXs and ADXs of 9Be(n,xa) and 9Be(n,t) reactions

The measured ADX of the 9Be(n,t) and and the evaluated value (ENDF-B/VI).

The measured ADX of the 9Be(n,xa) and the evaluated nuclear data (JENDL-3.3 and ENDF-B/VI).


Measurements of (d,x) reaction cross sections for IFMIF by Beryllium

  • In 2004, 51V(d,x) 49Cr, natFe(d,x) 55,56Co , natNi(d,x) 55Co , 60,61Cu , and 181Ta(d,x)178,180Ta cross sections have been measured.

natNi(d,x)61Cu

natFe(d,x)56Co


Heat load analysis of nbi duct

TF coil by Beryllium

NBI duct

Vacuum vessel

NBI duct

Blanket

Cryostat

Biological shield

PF coil

Heat Load Analysis of NBI Duct

Evaluation of nuclear heating and surface heat load due to bremsstrahlung by MCNP as ITER ITA task

Vacuum vessel

Blanket

Duct wall with hidden surface

D-NBI duct

NBI duct

Duct wall with facing surface



Hydrogen isotope analysis of the tftr tile
Hydrogen Isotope Analysis of the TFTR Tile by Beryllium

In 1993, the TFTR had the series of the D-T discharge experiments.

The absolute measurement of tritium depth profile in the order of mm on the surface of the plasma facing material (4D-CFC) has been left.

  • Nuclear Reaction Analysis with below 350-keV deuteron

    Depth profiles of Tritium, Deuterium and Lithium

  • Rutherford Backscattering Spectroscopy with 350-keV deuteronCarbon density of the matrix and some high Z impurities (W etc.)

  • Imaging Plate methods

    Tritium intensity and spatial distributions in the matrix

  • Activation Analysis with FNS D-T neutron source

    Medium Z metals (Fe, Ni, Co etc.)

  • Gas flow method

    The number of tritium and carbon-14

Our main objectives is to measure the tritium retention on the TFTR-PFM


Tritium depth profile on the surface of the tftr tile

T( by Beryllium d,an)

D(d,p)T

7Li(d,2an)

6Li(d,2a)

SSD

JAERI/FNS

80deg. Line

D+,1mA

150~380 keV

NE213

Tritium Depth Profile on the Surface of the TFTR tile

T-Retention

7.2 x 1015 T/cm2 (up to 1.2mm)

  • We mainly observed charged particles induced with T-d, D-d,6Li-d and 7Li-d reactions by means of nuclear reaction analysis.

Tritium profile on the surface, Activity=12.9 MBq/cm2. Density peak 1 x 1020cm-3 at near 0.5 mm depth.

Schematic view of the FNS-NRA system


Tritium depth profile on the surface of the tftr tile1

Schematic view of the FNS-NRA system by Beryllium

SSD

JAERI/FNS

80deg. Line

D+,1mA

150~380 keV

A piece at the corner of block in KC-16 was sampled

NE213

Tritium Depth Profile on the Surface of the TFTR tile

T-Retention

7.2 x 1015 T/cm2 (up to 1.2mm)

  • We mainly observed charged particles induced with T-d, D-d,6Li-d and 7Li-d reactions by means of nuclear reaction analysis.

Tritium profile on the surface, Activity=12.9 MBq/cm2. Density peak 1 x 1020cm-3 at near 0.5 mm depth.


Plan in 2004 2005
Plan in 2004-2005 by Beryllium

  • Integral Study on Structural/Blanket Materials

    • Benchmark experiment for the blanket assembly with pebbles

    • Benchmark experiment for the blanket assembly with the coolant panel.

  • Low Activation Materials Induced Radioactivity Experiments

    • Charged particle production cross section measurement for 6Li and 7Li.

    • Activation cross section measurement of (d,X) reactions for IFMIF materials,Ta, Fe, Ni and V, in the energy range of 20-35 MeV.

  • Others

    • ITER-ITA task : Nuclear heat analyses for NB and DNB ports.

    • Neutron Elastic Scattering Analysis of D and T in TFTR and JT-60 carbon tiles.


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