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Title:
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Neutron metrology in the HFR: Irradiation of Low Activation Steel specimens (ILAS) : evaluation report
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Author(s):
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Published by:
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Publication date:
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ECN
NUC
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1998
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ECN report number:
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Document type:
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ECN-I--98-028
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Other
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Number of pages:
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Full text:
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46
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Download PDF
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Abstract:
ECN is working on the assessment of low temperature irradiation hardeningand embrittlement of ferritic/martensitic alloys, developed for fusion
application. The irradiation of specimen holder R285-04 (ILAS) in the HFR in
Petten, Netherlands, loaded with tensile specimens manufactured from four
types of stainless steel alloys, is part of this programme. The R285-04
assembly was irradiated in channel 3 of a TRIO type facility in HFR
core-position D2 up to a target dose level of approximately 2.5 dpa
(displacements per atom) in stainless steel at a nominal temperature of about
325C. This report presents the final metrology results obtained from
activation monitor sets situated in one of the specimen channels inside the
specimen holder, including detailed information concerning an estimation of
the fluence dose received by each specimen separately and its temperature
during irradiation. The total number of displacements per atom (dpa), the
generated helium content and the activity values after irradiation for
several waiting times are also given for each specimen. Additionally the
metrology results were cross-checked with calculations by means of the
KENO-Va Monte Carlo code, giving a very good agreement on the centre-line of
the specimen holder, and larger deviations on the top and bottom positions of
the assembly. The main results of the thermal and fast neutron fluence
measurements, indicate that the obtained damage levels in the steel specimens
loaded in this specimen holder vary from 2.1 to 3.5 dpa. Detailed data are
presented. 28 refs.
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