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Remote detection of undeclared nuclear reactors remains one of the key goalsconcerning global nuclear security. To meet this goal the WATCHMANcollaboration has proposed the construction of a water based antineutrinodetector, sited 13 to 25 kilometres from a nuclear reactor complex.Antineutrinos from the reactor interact in the water of the detector via aninverse beta decay interaction resulting in two distinct cones of Cherenkovlight tens of milliseconds apart. Using this interaction WATCHMAN (WATerCherenkov Monitor for ANtineutrinos) will be the first detector to determinethe active/inactive status of a reactor complex at a stand-off greater than 10kilometres. The water used in the detector will be doped with gadolinium,providing the first demonstration of the potential of gadolinium dopeddetectors for reactor monitoring and will confirm the potential of thetechnology for use in larger multi-kiloton neutrino experiments. The proposedWATCHMAN design will be a kiloton scale water based detector, constructed of a16 metre diameter tank with a height of 16 metres and will compriseapproximately 3000 photomultiplier tubes.  An overview of the remote monitoring goals of the WATCHMAN collaboration willbe given, with a detailed description of the proposed detector. An outline ofthe two proposed WATCHMAN sites will also be detailed with a prediction of theexpected antineutrino rate and the time taken to determine the switch betweenthe associated reactor on and off state at each site. A brief summary of theproject and the future goals non-proliferation goals of the collaboration willalso be presented.

Remote detection of undeclared nuclear reactors using the WATCHMAN detector