Nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei.

Nuclear entombment is a method of nuclear decommissioning in which radioactive contaminants are encased in a structurally long-lived material, such as concrete.

Nuclear engineering is the branch of engineering concerned with the application of breaking down atomic nuclei (fission) or of combining atomic nuclei (fusion), or with the application of other sub-atomic processes based on the principles of nuclear physics.

Nuclear decommissioning is the administrative and technical process whereby a nuclear facility such as a nuclear power plant, a research reactor, an isotope production plant, a particle accelerator, or uranium mine is dismantled to the point that it no longer requires measures for radiation protection.

The nuclear cross section of a nucleus is used to describe the probability that a nuclear reaction will occur.

A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions.

Nuclear binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts.

A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility.

The Number of Transfer Units method is used to calculate the rate of heat transfer in heat exchangers (especially counter current exchangers) when there is insufficient information to calculate the Log-Mean Temperature Difference.

A Normally Unmanned Installation is a type of automated offshore Oil/Gas platform designed to be primarily operated remotely, without the constant presence of personnel.

In mechanics, the normal force is the component of a contact force that is perpendicular to the surface that an object contacts.

Nordex SE is a European company that designs, sells and manufactures wind turbines.

Nonimaging optics is the branch of optics concerned with the optimal transfer of light radiation between a source and a target.

Nondestructive testing (NDT) is a wide group of analysis techniques used in science and technology industry to evaluate the properties of a material, component or system without causing damage.

The non-spinning reserve or supplemental reserve is the extra generating capacity that is not currently connected to the system but can be brought online after a short delay.

A non-renewable resource is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption.

Fuels not obtained from non renewable sources.

Relates to power that is cannot be ramped up or ramped down quickly to meet load fluctuations.

The nominal power is the nameplate capacity of photovoltaic devices, such as solar cells, modules and systems, and is determined by measuring the electric current and voltage in a circuit, while varying the resistance under precisely defined conditions.

Nominal power refers to the maximum output of a generating plant in normal operating conditions.