IAEA CIELO Evaluations for Uranium Isotopes & Criticality Benchmarks Report
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Advanced nuclear model calculations with
the Empire code
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Standards_2016 (preliminary)
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Recent experimental data:
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235
U capture by Jandel
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238
U/
235
U and
238
U/
197
Au capture ratios by
Wallner
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Criticality benchmarks from ICSBEP
14-18
November
2016
CSEWG Meeting, BNL
2
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Standards_2016 caused severe perturbation
to criticality prediction, in spite of relatively
small changes, compared to “beta-2”
•
Re-tuning of Empire calculations
•
Improvements in cross sections were sought,
making use of:
•
DICE sensitivity profiles
•
Experimental data
while respecting the Standards_2016, to
improve performance in integral benchmarks
14-18
November
2016
CSEWG Meeting, BNL
3
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Wallner capture measurements at around 25 keV
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U8/U5 = 0.60 +/- 0.03 (~5%)
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U8/Au = 0.63 +/-
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x.s. from Standards_2016 for U8/Au in Excellent
agreement with Wallner
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U8/U5 ratio from Jandel data low by ~6%
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Lowering U5 capture
large impact on criticality
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Solution:
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Adopt IRMM data directly for U8 capture (+2% max.),
raising Wallner measured U8/Au ratio by 0.7%,
decreasing U8/U5 ratio to ~5%
14-18
November
2016
CSEWG Meeting, BNL
4
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Nu-bar of
235
U decreased by 0.1% in the
range 0.5-2.0 MeV w.r.t. ENDF/B-VII.1
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Nu-bar of
238
U increased, peaking to 1.5% at
2 Mev
14-18
November
2016
CSEWG Meeting, BNL
5
14-18
November
2016
CSEWG Meeting, BNL
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14-18
November
2016
CSEWG Meeting, BNL
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1 HEU-MET-FAST-001 hmf001 Godiva
2 HEU-MET-FAST-028 hmf028 Flattop-25
3 IEU-MET-FAST-007 imf007d Big_Ten(detailed)
4 PU-MET-FAST-001 pmf001 Jezebel
5 PU-MET-FAST-002 pmf002 Jezebel-240
6 PU-MET-FAST-006 pmf006 Flattop-Pu
7 U233-MET-FAST-001 umf001 Jezebel-U233
8 U233-MET-FAST-006 umf006 Flattop-23
9 PU-MET-FAST-022 pmf022 Bare(98
10 PU-MET-FAST-029 pmf029 Bare(88
11 IEU-MET-FAST-001 imf001-001 Jemima-1
12 IEU-MET-FAST-001 imf001-002 Jemima-2
13 IEU-MET-FAST-001 imf001-003 Jemima-3
14 IEU-MET-FAST-001 imf001-004 Jemima-4
This report discusses the IAEA CIELO evaluations for uranium isotopes, focusing on the impact of Standards_2016 on criticality predictions, adjustments in nuclear model calculations using the Empire code, and incorporation of experimental data to enhance performance in integral benchmarks.
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Presentation Transcript
IAEA CIELO Evaluations for 235,238U A.Trkov, R.Capote International Atomic Energy Agency Vienna, Austria
Basis Advanced nuclear model calculations with the Empire code Standards_2016 (preliminary) Recent experimental data: 235U capture by Jandel 238U/235U and 238U/197Au capture ratios by Wallner Criticality benchmarks from ICSBEP CSEWG Meeting, BNL 14-18 2 November 2016
Procedures Standards_2016 caused severe perturbation to criticality prediction, in spite of relatively small changes, compared to beta-2 Re-tuning of Empire calculations Improvements in cross sections were sought, making use of: DICE sensitivity profiles Experimental data while respecting the Standards_2016, to improve performance in integral benchmarks CSEWG Meeting, BNL 14-18 3 November 2016
Example: Wallner capture measurements at around 25 keV U8/U5 = 0.60 +/- 0.03 (~5%) U8/Au = 0.63 +/- x.s. from Standards_2016 for U8/Au in Excellent agreement with Wallner U8/U5 ratio from Jandel data low by ~6% Lowering U5 capture large impact on criticality Solution: Adopt IRMM data directly for U8 capture (+2% max.), raising Wallner measured U8/Au ratio by 0.7%, decreasing U8/U5 ratio to ~5% CSEWG Meeting, BNL 14-18 4 November 2016
Final tuning Nu-bar of 235U decreased by 0.1% in the range 0.5-2.0 MeV w.r.t. ENDF/B-VII.1 Nu-bar of 238U increased, peaking to 1.5% at 2 Mev CSEWG Meeting, BNL 14-18 5 November 2016
CSEWG Meeting, BNL 14-18 6 November 2016
List of main benchmarks 1 HEU-MET-FAST-001 hmf001 Godiva 2 HEU-MET-FAST-028 hmf028 Flattop-25 3 IEU-MET-FAST-007 imf007d Big_Ten(detailed) 4 PU-MET-FAST-001 pmf001 Jezebel 5 PU-MET-FAST-002 pmf002 Jezebel-240 6 PU-MET-FAST-006 pmf006 Flattop-Pu 7 U233-MET-FAST-001 umf001 Jezebel-U233 8 U233-MET-FAST-006 umf006 Flattop-23 9 PU-MET-FAST-022 pmf022 Bare(98 10 PU-MET-FAST-029 pmf029 Bare(88 11 IEU-MET-FAST-001 imf001-001 Jemima-1 12 IEU-MET-FAST-001 imf001-002 Jemima-2 13 IEU-MET-FAST-001 imf001-003 Jemima-3 14 IEU-MET-FAST-001 imf001-004 Jemima-4 CSEWG Meeting, BNL 14-18 7 November 2016
