Analysis of measurements from CAGR on-load instrumented stringers

The initial fuel loadings of the Hinkley Point B and Hunterston B CAGRs included specially developed stringers containing instrumentation to make channel performance measurements. More recently the emphasis of the instrumented stringer programme has concentrated on developing a means of detecting and quantifying carbonaceous deposit on the fuel pins. An analysis route has been set-up to compare measured and calculated can temperatures and to calculate Stanton Number changes. Present analysis is dedicated towards gaining an increased understanding of the relationship between measurement and prediction in the prevailing non-depositing coolants. A series of experiments has been planned for Hinkley Point B in which several instrumented stringers containing many instrumented pins will be used to quantify deposition in a number of different coolant compositions so that a composition giving the optimum compromise between graphite corrosion and deposition can be identified. (author)