Critical Mass Calculations for 241Am, 242mAm and 243Am.
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Accession number;03A0828431
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| Title;Critical Mass Calculations for 241Am, 242mAm and 243Am. |
| Author;
DIAS H
(Atomic Weapons Establishment Plc, Berkshire, Gbr)
TANCOCK N
(Atomic Weapons Establishment Plc, Berkshire, Gbr)
CLAYTON A
(Atomic Weapons Establishment Plc, Berkshire, Gbr)
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Journal Title;Nippon Genshiryoku Kenkyujo JAERI,Conf
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Journal Code:L2150A
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ISSN:
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VOL.;NO.;PAGE.618-623(2003)
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| Figure&Table&Reference;FIG.2, TBL.3, REF.34 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Critical mass calculations are reported for 241Am, 242mAm and 243Am using the MONK and MCNP computer codes with the UKNDL, JEF-2.2, ENDF/B-VI and JENDL-3.2 nuclear data libraries. Results are reported for spheres of americium metal and dioxide in bare, water reflected and steel reflected systems. Comparison of results led to the identification of a serious inconsistency in the 241Am ENDF/B-VI DICE library used by MONK-this demonstrates the importance of using different codes to verify critical mass calculations. The 241Am critical mass estimates obtained using UKNDL and ENDF/B-VI show good agreement with experimentally inferred data, whilst both JEF-2.2 and JENDL-3.2 produce higher estimates of critical mass. The computed critical mass estimates for 242mAm obtained using ENDF/B-VI are lower than the results produced using the other nuclear data libraries-the ENDF/B-VI fission cross-section for 242mAm is significantly higher than the other evaluations in the fast region and is not supported by recent experimental data. There is wide variation in the computed 243Am critical mass estimates suggesting that there is still considerable uncertainty in the 243Am nuclear data. (author abst.) |
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