دانلود رایگان مقاله آنالیز حرارتی کرچک RBMK-1500 طی ذخیره سازی سوخت هسته ای

Abstract

In this paper, thermal analysis of German CASTOR RBMK-1500 casks for long-term (up to 300 years) storage of spent nuclear fuel at the Ignalina Nuclear Power Plant was performed. The numerical modeling code ALGOR (USA) which allows modeling temperature and heat flux distributions inside a cask (in fuel load) and in a cask body, was used. The modeling was performed for a cask in an open storage facility in summer and winter conditions. A detailed analysis was performed including previous results about casks with just loaded fuel (pre-stored in water pools for 5 years) and after 50 years of interim cask storage. Also, a local sensitivity analysis of parameters that mostly influence the temperature distribution was performed.

5. Conclusions

The detailed thermal analysis of German CASTOR RBMK-1500 casks intended for storage of SNF at the Ignalina NPP during a long-term period of up to 300 years in an open storage facility in summer and winter conditions allows the following conclusions to be drawn: 1. The most significant decrease of the fuel load temperature is during the first 5–50 years of SNF storage. Later changes in the temperature are less significant. 2. Uncertainties of the decay heat and of the effective conductivity of the fuel load have the largest impact on the maximal fuel load temperatures in the first 5–50 years of SNF storage. 3. Uncertainties of the ambient temperature have the largest impact on the cask surface temperatures during the whole storage period and even on the maximal fuel load temperatures at later stages of the storage (after 100 years). 4. Even taking into account the uncertainties, the fuel load (fuel cladding) maximal temperature does not exceed the limiting temperature of 300 C.