Yes, NARRATION is a Scrabble word!

Letter values in Scrabble US: N 1, A 1, R 1, R 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

NARRATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a message that tells the particulars of an act or occurrence or course of events; presented in writing or drama or cinema or as a radio or television program
the act of giving an account describing incidents or a course of events
(rhetoric) the second section of an oration in which the facts are set forth