Yes, STRIATIONS is a Scrabble word!

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

Is it a valid word?

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

any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue
a stripe or stripes of contrasting color