THE TEMPERATURE COEFFICIENTS OF BEPO AND THE WINDSCALE PILES

TL;DRAbstract

More precise results were obtained from temperature coefficient measurements on BEPO by improved instrumentation and a change in the method of result analysis. The lattice uranium coefficient was found to be -1.59 plus or minus 0.1 x 10/sup -5/ per deg C. Early runs consistently gave the lattice graphite coefficient (vacuo) as -3.9 x 10/sup -5/ deg C, while later runs gave -3.4 x 10/sup -5// deg C. As no satisfactory explanation has been found for this discrepancy, this has been taken into account in assessing the error on the graphite measurements, which is considered to be plus or minus 0.2 x 10/sup -5/. These values were compared with the results obtained on the Windscale piles using formulas derived from the lattice calculations. The uranium coefficients and the higher value for the graphite coefficient of BEPO give as good agreement as expected. These results were applied to Pippa. An upper limit of 1.7 per cent k taken up by temperature effects was given. (auth)

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