Yes, SAFETIES is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, F 4, E 1, T 1, I 1, E 1, S 1.

Is it a valid word?

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

the state of being certain that adverse effects will not be caused by some agent under defined conditions
a safe place
a device designed to prevent injury or accidents
(baseball) the successful act of striking a baseball in such a way that the batter reaches base safely
contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
a score in American football; a player is tackled behind his own goal line

Also: safety device, base hit.