Yes, PULSATIONS is a Scrabble word!

Letter values in Scrabble US: P 3, U 1, L 1, S 1, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
a periodically recurring phenomenon that alternately increases and decreases some quantity
the rhythmic contraction and expansion of the arteries with each beat of the heart