(1) A Charpy test never fails. It does what it is supposed to do.
(2) Second sentence is almost unintelligible, but I think you are asking for alternatives?
(3) Keep your life simple and stick with Yankee standards, such as A516-70N. I detest the entire unnecessary CSA creation of standards when perfectly good ones already exist (see (2) above).
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"