Will liquid nitrogen stop a nuclear reaction?

Answer 1

No. As you approach absolute zero, molecular activity slows down, but the nuclear precesses will continue.

Answer 2

i do no longer consider thought of particular warmth. the sea water is visibly no longer waiting to quiet down the middle. Liquid nitrogen could have been used in preliminary section. as quickly as the middle temperature became in controllable state, then different coolants could have been used. Liq. N2 could have low warmth potential yet very low temperature in comparison with water or ecosystem. So even a amateur would calculate which of the two will carry middle temperature down speedier. Now that's long previous out of hand by way of fact the reactor vessel has molten. Now purely way that keeps to be is to anyhow pass the middle into deep sea, or placed lots of airborne dirt and dust over the middle (to take care of U rods from air) after including boron to it. In 2d state of affairs, there can nevertheless be risk for explosion.