Which of the following statements is true about the steam generation in BWRs?

The statement that steam is produced directly from boiled primary water is accurate in the context of Boiling Water Reactors (BWRs). In a BWR, water that acts as both the coolant and the moderator is heated by the nuclear fission process occurring in the reactor core. As the primary water travels through the reactor, it absorbs heat and is boiled, directly producing steam. This steam is then used to drive turbines for electricity generation.

Other statements do not align with the functioning of a BWR. For example, steam generation in BWRs does not involve burning coal or relying on chemical reactions. It fundamentally relies on the heat generated from nuclear fission, without any need for external heat sources. Understanding this process highlights the direct relationship between the reactor core's fission activity and the production of steam, which is essential to the operation of BWRs.