The haling principle-true or false?

The Haling principle has long been viewed as an idealized control strategy for maximizing thermal margin over the operating cycle of a nuclear reactor core. In essence, the Haling principle states that the time-dependent power distribution that minimizes power peaking over the cycle is that power distribution which remains invariant throughout cycle. Applicable but not strictly limited to boiling water reactor (BWR) operation, maintaining a constant power Haling distribution through manipulation of control materials should, in theory, yield an optimum beyond which further reductions in thermal margin remain unachievable, given a particular arrangement of fuel inventory