Decay radioactivity induced in plasma-facing materials by deutrium-tritium neutrons

Journal Article · Tue Aug 01 00:00:00 EDT 1995 · Fusion Technology

OSTI ID:121587

Kumar, A; Abdou, M A; Youssef, M Z ^[1]; Ikeda, Y; Konno, C; Kosako, K; Oyama, Y; Nakamura, T; Maekawa, H ^[2]

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1. Univ. of California, Los Angeles, CA (United States)
2. Japan Atomic Energy Research Inst., Ibaraki (Japan)

Deuterium-tritium (D-T) neutron-induced radioactivity constitutes one of the foremost issues in fusion reactor design. Designers have been using radioactivity codes and associated nuclear data libraries for nucleonic designs of fusion reactors. However, in the past, there was hardly any experimental validation of these codes/libraries. An elaborate, experimental program was initiated in 1988 under a U.S. Department of Energy/Japan Atomic Energy Research Institute collaborative program to validate the radioactivity codes/libraries. As many as 14 neutron energy spectra were covered for a number of materials. The analyses of the isotopic activities of the irradiated materials using the activation cross-section libraries of four leading radioactivity codes, i.e., ACT4/THIDA-1, REAC-3. DKR-ICF; and RACC, have shown large discrepancies among the calculations on one hand and between the calculations and the measurements, on the other. Vanadium, Co, Ni, Zn, Zr, Mo, In, Sn, and W each count the largest number of discrepant isotopic activities. In addition to providing detailed results of the status of predictability of individual isotopic activities using the ACT4, REAC-3, DKR-ICF, and RACC activation cross-section libraries, safety factors cum quality factors characterizing each library are presented and discussed. The related issues of confidence level and associated uncertainty are also highlighted. 37 refs., 112 figs., 24 tabs.

• DOE Contract Number: FG03-86ER52123
• OSTI ID: 121587
• Journal Information: Fusion Technology, Vol. 28, Issue 1; Other Information: PBD: Aug 1995
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
36 MATERIALS SCIENCE
D-T REACTORS
DESIGN
THERMONUCLEAR REACTOR MATERIALS
GAMMA SPECTRA
CROSS SECTIONS
EXPERIMENTAL DATA
RADIOACTIVITY
COMPUTER CODES
REACTOR SAFETY
NUCLEAR REACTION KINETICS
ALUMINIUM
SILICON
TITANIUM
VANADIUM
CHROMIUM
MANGANESE ALLOYS
IRON
COBALT
IRIDIUM
NICKEL
COPPER
STAINLESS STEEL-316
ZINC
ZIRCONIUM
NIOBIUM
INDIUM
TIN
TANTALUM
TUNGSTEN
LEAD
RADIOISOTOPES