Yes, INEBRIATION is a Scrabble word!

Letter values in Scrabble US: I 1, N 1, E 1, B 3, R 1, I 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

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

habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms
a temporary state resulting from excessive consumption of alcohol

Also: alcohol addiction.