Two-phase pressure drop reduction BWR assembly design

Details Two-phase pressure drop reduction BWR assembly design Two-phase pressure drop reduction BWR assembly design

1988-04-04

1992-05-12

Stoll, Robert L.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

370377, 370428, 370435, G21C 1500

Patent

active

051125706

ABSTRACT:
In a boiling water reactor having discrete bundles of fuel rods confined within channel enclosed fuel assemblies, an improved fuel design of bundles of fuel rods interior of the channels is disclosed. Specifically, partial length rods are utilized which extend from the bottom of the channel only part way to the top of the channel. These partial length rods are symmetrically distributed throughout the fuel bundle with the preferred disposition being in the second row of the bundle of fuel rods from the channel wall. The symmetrical distribution of the partial length rods is at spaced apart locations one from another. During shutdown of the reactor, an improved cold shutdown margin is produced at the top of the fuel assembly due to the improved moderator-to-fuel ratio and reduction in plutonium formation at the upper portion of the bundle. Shutdown control rod worth is improved due to greater moderator-to-fuel ratio and a longer thermal neutron diffusion length. During power reactor operation, the partial length fuel rods improve flow distributions above the ends of the partial length rods by channeling steam in the open interstitial area between rods above the ends of the partial length rods.

REFERENCES:
patent: 2998367 (1961-08-01), Untermyer
patent: 4629599 (1986-12-01), Crowther et al.
patent: 4675154 (1987-06-01), Nelson et al.
patent: 4863680 (1989-09-01), Sakurada et al.
patent: 4957698 (1990-09-01), Ritter

Affiliated with

Also associated with

Rating

Two-phase pressure drop reduction BWR assembly design does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Two-phase pressure drop reduction BWR assembly design, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-phase pressure drop reduction BWR assembly design will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2425593