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