Plans for Validation and General Observations

Plans for Validation and General Observations

Mohamed Sawan

Fusion Technology InstituteThe University of Wisconsin-Madison

3rd RCM on FENDL-36-9 December 2011

IAEA, Vienna

Observations on General Purpose FENDL-3.0 Library

• The library is complete with 180 materials that include all missing materials and additional materials requested by users and identified at 2nd RCM (up from 71 materials in FENDL-2.1)

• All isotopic data as agreed on at 1st RCM• All high energy data are there except for H3,

He3, and He4 that were identified at the 2nd RCM with no high energy data available

• Mn55 and Th232 have data only to 60 MeV vs. 150 or 200 MeV for other materials

M. Sawan 3rd RCM on FENDL-3, 6-9 December 2011, IAEA, Vienna 2

Observations on General Purpose FENDL-3.0 Library

• No ACE formatted processed library is available to perform validation

• We plan to perform benchmark analysis using the processed FENDL-3.0 library

• Such calculations are important to uncover possible processing issues as was revealed by calculations for the FENDL-3.0 starter library

• Calculations will be performed for both the ITER calculational benchmark and mock-ups used in integral 14 MeV experiments (FNG, FNS)


FNG Experiments Analyzed


Tungsten

Bulk shielding

Streaming

HCPB breeder

FENDL-3/SLIB2 Calculations for FNG Bulk Shield Experiment


Small difference compared to FENDL-2.1 Bulk shield mock-up thickness is much smaller than magnet

shielding in ITER

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ITER Calculational Benchmark

To quantify impact of data changes, MCNP calculations for a 1-D ITER calculational benchmark was utilized during FENDL development process

3rd RCM on FENDL-3, 6-9 December 2011, IAEA, Vienna

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ITER Calculational Benchmark

FENDL-2.1 is the reference library for ITER Results for flux, heating, dpa, and gas production will be compared to the

results of FENDL-2.1 Results will provide guidance to ITER regarding the need of changing the

reference library to FENDL-3.0 or just adding a correction/safety factor to the the current results



Peak Neutron and Gamma Flux Results with FENDL-3/SLIB2a

• Neutron and gamma fluxes at VV and magnet that are heavily shielded by water-cooled SS are higher by 1-3% than predicted by FENDL-2.1

• Calculations will be performed using the latest processed FENDL-3.0 library to assess possible impact on ITER calculations

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Neutron Spectrum at OB Magnet with FENDL-3/SLIB2a

• Using FENDL-3/SLIB2a corrected the anomaly in low energy spectrum caused by wrong secondary energy spectra

• Energy spectra from FENDL-3/SLIB2a and FENDL-2.1 are close with differences up to ~10% at E>2 MeV



Notable change in FENDL-3 is switch for H-1 from JENDL-3.3 to ENDF/B-VII.0

Lower (n,) cross sections at high energy could be reason for higher neutron flux (particularly at high energy) in regions heavily shielded by water-cooled SS

H-1 Data in FENDL-3 vs. FENDL-2.1


Peak Nuclear Heating Results with FENDL-3/SLIB2a

• Using the corrected FENDL-3 starter library (FENDL-3/SLIB2a) removed the large overestimate at deep penetration locations

• Nuclear heating at magnet is higher by ~2% than predicted by FENDL-2.1

• Differences with latest version are to be determined


Peak IB Magnet Nuclear Parameters with FENDL-3/SLIB2a

• Nuclear parameters at magnet are higher by ~1.5-3.5% than predicted by FENDL-2.1

• Largest differences are in fast neutron fluence and dpa that are determined by high energy flux

• Effects will be assessed with recent version


Remaining Issues

Release of processed ACE formatted library

Release of processed multi-group library (MATXS format)

Existing benchmarks (calculational and experimental) use materials included in FENDL-2.1

We need new set of benchmarks to validate data for the new materials added

Plans for Validation and General Observations

Documents

Transcript of Plans for Validation and General Observations