this document might be of interest in regard to recriticality in BWRs
http://bit.ly/mpxlJB
source:
http://www.sciencedirect.com/science/article/pii/S0029549301003922
i apologize if this has been posted earlier. below links to 3 presentations from the icapp meeting special japan session.
https://www.sfen.fr/content/download/30655/1616957/file/1-ICAPP_Omoto2.pdf...