STP has been experiencing a difference between predicted cycle lengths and actual EOC burnup (specifically, over-predictions of cycle length).  This effect seems to have begun when we started using 1.5x (B-10 loading) IFBA. Westinghouse uses their APA package for our core design. Has any other utility had a similar experience?

Duane Gore

Supervisor, Reactor Engineering

STPNOC

(361) 972-8909