... concerned that it might have insufficient fissile material. The resulting British inventory of military plutonium is shown in Table 2. Table 2. Britain's military inventory of plutonium Central estimates in tonnes, 31 December 1995 Source Tonnes Windscale piles 0.4 Calder Hall and Chapelcross 3.0 Initial discharges from civil reactors 0.2 Subtotal 3.6 Losses in reprocessing and weapon production (c. 3%) -0.1 Losses through weapon testing -0.3 Transfers to ... the Thermal Oxide Reprocessing Plant, THORP), partly encouraged by the US decision in the mid-1970s to abandon civil reprocessing ...

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• Grade Level: Undergraduate