What type of reaction was Fukushima?

The energy released in the fission reaction is used to boil water into steam that spins turbines to produce electricity. Fuel rods are submerged in a circulating water bath to prevent overheating.

What is a negative reactivity coefficient?

A negative void coefficient means that the reactivity decreases as the void content inside the reactor increases – but it also means that the reactivity increases if the void content inside the reactor is reduced.

What happened in Fukushima nuclear power plant?

At the Fukushima nuclear power plant, the gigantic wave surged over defences and flooded the reactors, sparking a major disaster. Authorities set up an exclusion zone which grew larger and larger as radiation leaked from the plant, forcing more than 150,000 people to evacuate from the area.

What do you mean by positive temperature coefficient?

: a larger than 1 ratio of a quantity (as resistance or length) at a higher temperature to the corresponding value of the quantity at a lower temperature.

What do you mean by temperature coefficient?

A temperature coefficient describes the relative change of a physical property that is associated with a given change in temperature.

What is reactivity in a nuclear reactor?

In nuclear reactor: Reactor control. …in the nuclear industry is reactivity, which is a measure of the state of a reactor in relation to where it would be if it were in a critical state. Reactivity is positive when a reactor is supercritical, zero at criticality, and negative when the reactor is subcritical.

What is negative reactivity feedback?

Negative feedback as the moderator temperature effect influences the neutron population in the following way. If the temperature of the moderator is increased, negative reactivity is added to the core. This negative reactivity causes reactor power to decrease.