what is the difference between pwr and bwr
Boiling water reactor The boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), also a type of light water nuclear reactor. The main difference between a BWR and PWR is that in a BWR, the reactor core heats water, which turns to steam and then drives a steam turbine. In a PWR, the reactor core heats water, which does not boil. This hot water then exchanges heat with a lower pressure water system, which turns to steam and drives the turbine. The BWR was developed by the Idaho National Laboratory and General Electric (GE) in the mid-1950s. The main present manufacturer is GE Hitachi Nuclear Energy, which specializes in the design and construction of this type of reactor.
P45 (tax) The "P" code refers to documents in the PAYE series, in the same way that self-assessment documents are prefixed "SA" (e.g., SA100 - Individual tax return) and Tax credits paperwork is prefixed "TC" (e.g., TC600 - Tax credits application).[citation needed]