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Titel:
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Neutron metrology in the HFR: Irradiation of Low Activation Steel Specimens R285-05 (ILAS): evaluation report
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
NUCLEAIR
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1-6-1998
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ECN publicatienummer:
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Publicatie type:
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ECN-I--98-040
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Overig
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Aantal pagina's:
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Volledige tekst:
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46
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Niet beschikbaar.
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Samenvatting:
Within the framework of the advanced materials programme, ECN is workingon the assessment of low temperature irradiation hardening and embrittlement
of ferritic-martensitic alloys for fission applications. The irradiation of
specimen holder R285-05 (ILAS) in the HFR Petten, loaded with tensile
specimens, manufactured from four types of stainless steel alloys, is part of
this programme. The R285-05 assembly was irradiated in channel 1 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 target temperature of about 300C (575K). In this report the final
metrology results are presented 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 rather good agreement on the mid-plane positions 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 2.2 to. 3.8. dpa. The temperatures
of the specimens during irradiation varied between 315 and 360C. 29 refs.
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