Noun
(VLSI) Initialism of line width roughness; used by semiconductor process engineers to describe a lithographic process problem.
(nuclear power) Initialism of light water reactor; a nuclear reactor which uses light water as a neutron moderator.
Source: en.wiktionary.orgAn option for getting rid of this plutonium is to use it as a fuel in a traditional Light Water Reactor (LWR). Source: Internet
In a light water reactor (LWR), the entire reactor core is a single large pressure vessel containing the light water, which acts as moderator and coolant, and the fuel arranged in a series of long bundles running the length of the core. Source: Internet