Forget the page, but it's like 67~69 range? that explains how grenades are used.
Krak grenades can only be used against vehicles and monstrous creatures in close combat; it's one attack per model in the unit that has it as a part of their war gear at the S, AP listed in the BRB.
(Ex, 10 Grey Hunters are assaulted by a carnifex. They pass their counter-attack check, but instead choose to use their krak grenades. They proceed to roll only 10 attacks at their WS and the S of the 'nades vs the 30 attacks at their WS and base S.)
Also, one dude in the unit during the shooting phase may throw a krak grenade.
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