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Report No.
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Research and development of high-heat temperature resistance type mineral insulated cables for severe accident in LWR

Nakano, Hiroko  ; Takeuchi, Tomoaki  ; Hirota, Noriaki  ; Ide, Hiroshi ; Hanawa, Masashige*; Tsuchiya, Kunihiko 

Since the accident at the Fukushima Dai-ichi Nuclear Power Plants (NPPs), it has started a research and development which corresponds to the provisions to monitor NPPs situations during a severe accident (SA). Considering that reactor vessel might be exposed to high radiation at high temperature under SA, difficulties may arrear in the measurement of temperature and pressure in the reactor vessel for long time. Thus it is necessary for the measurements of them to develop mineral insulated (MI) cables with radiation- and heat-resistant. In this study, the electric and corrosion properties of the MI cables were evaluated in the conditions that may simulate SA to develop MI cables that can be used even in SA environment. Based on the experiments above, the prospect is obtained that MI cable using nickel alloy as a sheath material can be proposed as a high-temperature MI cable that can be used even in SA environment.

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