We consider Coulomb blockade oscillations of thermoelectric coefficients of
a single electron transistor based on a quantum dot strongly coupled to on
e of the leads. An analytic expression for the thermopower as a function of
temperature T and the reflection amplitude r in the quantum point contact
is obtained. Two regimes can be identified: T << E-C\r\(2) and T << E-C\r\(
2), where E-C is the charging energy of the dot. The former regime is chara
cterized by a weak logarithmic dependence of thr thermopower on the reflect
ion coefficient, in the latter the thermopower is linear in the reflection
coefficient \r\(2) but depends on temperature only logarithmically.