  One of the main problems of neutrino physics is the measurement of mixing
parameter sin2(2 teta 1 3). At present time several projects of reactor
experiments with sensitivity of sin2(2 teta 1 3) ~ 0.01 are under discussion.
Practically, all of them are based on the principle 'one reactor- two
detectors'. Such approach suppose to use NPP reactor with power of several GW
as the source of neutrino and two detectors of similar configuration placed at
different distance from the reactor. The sistematic error in such experiments
may reach ~ 1% and the accuracy ~ 0.01 as the result. In this paper we propose
to use for the measurement of sin2(2 teta 1 3) the existing SuperKamiokande
(SK) set-up in combination with 'own' antineutrino source - nuclear reactor of
small thermal power ~ 300MW (LPR). Such experiment could be carried out in
relatively short time. As it was shown by the study of different detection
mechanisms, the combination LPR-SK allows to obtain the sensitivity of sin2(2
teta 1 3) ~ 0.002.
