Hi Giuys found correct solution: On IRCTC SIte it's mentioned as:
What happens if after preparation of chart my ticket remains in RAC and I don't want to travel?
A.. If...
more... the user wishes to cancel his e-Ticket, he can do so till the time of chart preparation for the train (which is normally 4 hours before the scheduled departure of the train from the train starting station) through the Internet. No cancellation of e-ticket is permitted on-line after the chart preparation.For any claims on e-tickets to be cancelled after the preparation of Reservation charts, the user has to send an email at the earliest possible time to etickets@irctc.co.in giving full details of the ticket and stating the claim, which would then be processed by IRCTC with the Railway administration offline and refunds as sanctioned by the Railway administration would be credited back to the user's account.