Fusion neutronics activity at jaeri from october 2000 to september 2001
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Fusion Neutronics Activity at JAERI from October 2000 to September 2001. Peseted by Takeo NISHTANI IEA International Work Shop on Fusion Neutronics The Kongreshous Baden-Baden, Germany 18th October, 2001 (During 10th ICFRM Conference). Fusion Neutronic Activity Items at FNS/JAERI.

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Fusion Neutronics Activity at JAERI from October 2000 to September 2001

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Fusion neutronics activity at jaeri from october 2000 to september 2001

Fusion Neutronics Activity at JAERI from October 2000 to September 2001

Peseted by Takeo NISHTANI

IEA International Work Shop on Fusion Neutronics

The Kongreshous Baden-Baden, Germany

18th October, 2001 (During 10th ICFRM Conference)


Fusion neutronic activity items at fns jaeri

Fusion Neutronic Activity Items at FNS/JAERI

  • 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


Breeding blanket experiments

Breeding Blanket Experiments

OBJECTIVES

One of our aim is to verify the nuclear performances of resent

designed thermal blankets.

IN THE PRESENT

2-dim F82H/6Li-enriched Li2TiO3/Beryllium mock-up

- Tritium production performance for 6Li-enriched (40~95%) breeder

- Verification of activation of a ferric steel (F82H) for fusion neutron fields

FUTURE WORKS

3-dim F82H/Water/Breeder/Beryllium mock-up

Pebbly mock-up


Present blanket assembly

Present Blanket Assembly

Detectors (NE213)

FNS 80deg. D-T target

A blanket assembly

Shielding (Li2CO3)

A schematic view of FNS blanket experiments


Measurement and analysis methods

Measurement and Analysis Methods

  • Measurements

    • MeV-neutronf14-mm NE213

    • Reaction ratesFission Chamber(U-235 and U-238)

    • HPGe (Nb, Al, In, Au and F82H sheet)

      • Liquid Scintillation Counter (Aloka-5500)

        Calculation

        Code MCNP-4B

        Nuclear dataJENDLE-3.3 and JENDLE-FF


Results of measurements

Results of Measurements

Above spectra show the g-ray spectrum emitted from the irradiated F82H(Fe: balance, Cr: 8% and W: 2%) and b-ray spectrum emitted from the irradiated Li2TiO3 pellet. the reaction rates of the activities and tritium production can be obtained by the spectra.

The g-ray spectrum emitted from the F82H

The b--ray spectrum emitted from the Li2TiO3


Preliminary result

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


Shielding benchmark experiments for iter r d task t 426

Shielding benchmark experiments for ITER (R&D Task T-426)

  • Shutdown dose measurements to evaluate accuracy of the new one step method

  • Double bent duct streaming experiment

  • Decay heat measurements for copper and type 316 stainless steel(presented at ICFRM-10)


Fusion neutronics activity at jaeri from october 2000 to september 2001

9.0

3.5

Reflector

(SS316)

Source Reflector

(SS316)

Shield

(SS316/H20)

8.0

3.0

7.0

6.0

2.5

5.0

Shutdown dose rate(mSv/hr)

2.0

300

#a

#b

#c

800φ

4.0

1200φ

200

3.0

1.5

#A

#B

#C

356

2.0

1.0

1.0

0.0

0.5

1.0

3.0

5.0

7.0

9.0

11.0

13.0

15.0

D-T source

Test region

Cooling time (x 105sec)

Shutdown dose measurements

  • Shutdown dose rates can be evaluated by the new one step method within experimental error (~10%)

FENDL/2A

FENDL/2

#A

#a

Cross sectional view of the assembly

Comparison of shutdown dose rates


Fusion neutronics activity at jaeri from october 2000 to september 2001

Auxiliary Shield

550

750

1200

Streaming Assembly

#6

DT Source

#1

#2

#3

Duct Opening

(300 x 300)

1700

900

1000

#4

#5

800

150

565

765

Auxiliary Shield

Iron Rack

335

1800

200

Double bent duct streaming experiment

  • Typical streaming effects can be reproduced by MCNP & FENDL/2 (~30%)

Calculation

#3

Experiment

#4

#6

Neutron flux (n/cm2/source/lethargy)

#5

Energy (MeV)

Cross sectional view of the assembly

Comparison of neutron spectrum


Activation experiments for sequential charged particle reactions scpr

Activation Experiments for Sequential Charged Particle Reactions (SCPR)

  • For the safety design of future D-T reactors it becomes important to consider activations via SCPR.

  • Many protons are generated in coolant water, so sequential reactions will be enhanced around the surface of coolant pipes.

    → Fusion material foils (Cu, V, Ti, Fe, W, Pb) attached on a polyethylene board were irradiated by 14-MeV neutrons at FNS/JAERIand the sequential reaction rates were obtained for 5 positions.


Preliminary results

Preliminary Results

  • The sequential reaction rate of 51V(p,n)51Cr for the foil-1 close to a polyethylene board is about 20 times larger than that for the foil-5 far from foil-1.

Measured gamma-ray spectrum from V sample

Reaction-rate distribution of 51V(p,n)51Cr


Development of artificial diamond detector

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.

CVD diamond

5.486 MeV particles

0.4 %

Polycrystalline

Single crystalline


Development of micro fission chamber for iter

Fabricated micro-fission chamber

Development of Micro-fission Chamber for ITER

■Micro-fission chamber was developed to be installed in ITER

vacuum vessel for power monitor.

■Basic performances for radiation measurement under in-vessel

condition were tested and confirmed to be excellent.


Main result of performance test

10-3

Total Neutron Flux Calc.

10-5

>10MeV Neutron Flux Calc.

Counts/sec/Source or n/cm2/sec/Source

Reaction Rates Calc.

10-7

Count Rates

Meas.

10-9

Chamber Location

Comparison between Count Rates &

Neutron Flux

Arrangement of Shielding Experiment

Main result of performance test

■Linearity between neutron source and detector response was

confirmed.

■Response sensitivity for the neutron

shielding turned out excellent.

■Gamma-ray background was estimated

less than 0.1% the neutron flux.

1

2

3

4


Future plan in fusion neutronic at fns jaeri

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


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