There is no need to file TDR for reason "Passenger not Travelled".
Revised Cancellation rules(w.e.f. 12.11.2015):
Cancellation charge per passenger on confirmed (reserved) tickets:-
(i). 48 hours before the scheduled departure of the train minimum cancellation charge
1st...
more... AC/executive class: Rs. 240
2 AC/1st Class : Rs. 200
3AC/ACC/3A economy: Rs. 180
Second sleeper class : Rs. 120
Second class : Rs. 60
(ii). Between 48 hours and 12 hours before the scheduled
departure of the train @ 25% subject to minimum charge as per (i) above.
(iii) between 12 hours and 4 hours before the scheduled departure of the train @ 50% subject to minimum charge
as per (i) above.
(iv) No refund after the above prescribed time limit.