Yes, BURNINGS is a Scrabble word!

Letter values in Scrabble US: B 3, U 1, R 1, N 1, I 1, N 1, G 2, S 1.

Is it a valid word?

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

the act of burning something
pain that feels hot as if it were on fire
a process in which a substance reacts with oxygen to give heat and light
execution by electricity
execution by fire
a form of torture in which cigarettes or cigars or other hot implements are used to burn the victim's skin

destroy by fire
shine intensely, as if with heat
undergo combustion
cause a sharp or stinging pain or discomfort
cause to burn or combust
feel strong emotion, especially anger or passion
cause to undergo combustion
burn at the stake
spend (significant amounts of money)
feel hot or painful
burn, sear, or freeze (tissue) using a hot iron or electric current or a caustic agent
get a sunburn by overexposure to the sun
create by duplicating data
use up (energy)
burn with heat, fire, or radiation

Also: burning at the stake, burn down, burn off, burn up.

Not playable in Scrabble US: CAUTERISE.