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Title:
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10 DPA 600 K fracture toughness of 316L(N) ERHII plate material: ITER Task T214, NET deliverables GB5 ECN-4 and GB6 ECN-4
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Author(s):
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Published by:
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Publication date:
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ECN
NUCLEAIR
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1998
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ECN report number:
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Document type:
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ECN-C--98-032
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ECN publication
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Number of pages:
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Full text:
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23
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Download PDF
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Abstract:
The fracture toughness properties of unirradiated and neutron irradiatedtype 316L(N)-SPH stainless steel plate have been measured. Compact tension
specimens with a thickness of 2.5 mm of the European Reference Heat 11
(ERH11) were irradiated in the High Flux Reactor (HFR) in Petten, The
Netherlands, simulating the first wall conditions by a combination of high
displacement damage with proportional amounts of helium. Helium contents are
up to 80 appm for 10 dpa dose level. The irradiation conditions were 1 and 10
displacements per atom (dpa) at 600K. The report contains the experimental
conditions and summarises the results, which are given in terms of
J-resistance curve fits. The main conclusions are that the 1 dpa, 600K
irradiation gives a considerable reduction in J-toughness in the plate
materials. The increase of the dose up to 10 dpa does give a further
significant decrease in fracture toughness. Fractography supports these
measurements. As these fracture toughness measurements have been obtained by
using small CT-specimens with a thickness of 2.5 mm, and as unirradiated
austenitic stainless steel has a very high toughness, the values presented do
not qualify as a size independent material property. However, the fracture
toughness is reduced significantly after 10 dpa irradiation, approaching the
validity criteria. Further it is shown that the fracture toughness results
for reference and 1 dpa irradiated material presented here are conservative
compared to results of 10 mm thick CT fracture toughness experiments. This
conservatism is probably less present for the 10 dpa irradiated specimens
because of the amount of embrittlement. Further work is continuing,
investigating the fracture toughness of 600K 10 dpa irradiated 316L(N) TIG
deposit and 316L(N) Electron beam welds. 14 refs.
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