| 摘要 |
<p>The present invention discloses an improved construction and methodology for achieving desirable recirculation flow control and/or sub-cooling control in a BWR enabling reactors utilizing the method to perform in load-following and/or spectral shift modes of power operations. In its broadest aspects, the method is based on the application of at least two feedwater spargers (16; 18 and/or 50) at different locations in the reactor to achieve load following capability by modifying core inlet sub-cooling or recirculation flow in the reactor. In one aspect the application of a second feedwater sparger modifies the driving head because the down-flow of core-generated steam not completely separated out of the recirculating coolant (termed "steam carryunder"), being quenched at different elevations, will result in a different recirculation flow rate, thus influencing the power level. The double sparger concept used to modify sub-cooling additionally will influence the void fraction and density of the water in the core, thus effecting the power level in the core.</p> |
