When
will she finish her training ?
(question, direct speech >>> the future tense is possible)
I
don't know when she will finish
her training.
(reported speech >>> the future tense is possible)
She
looks forward to the day when she
will finish her training.
(relative clause >>> the future tense is possible)
When
she finishes her training, she will be in charge of a reactor.
(tense clause >>> the future tense is NOT
possible)
RULE : NO FUTURE IN TENSE CLAUSES
introduced
by when, as soon as, as long as, while ...