Method for modifying existing transition pieces in bottom entry nuclear fuel assemblies for reducing coolant pressure drop
US5383227A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Aug 23, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method is provided for retrofitting nuclear fuel assemblies in bottom entry fuel assembly type nuclear reactors having a transition piece to guide liquid coolant into a channel entry area. The transition piece is disposed above an entry orifice in a fuel assembly support plate. The transition piece has side walls and a multi-pronged lead-in finger. The method comprises the steps of removing the lead-in finger from the transition piece, machining internal surfaces of the side walls of the transition piece and installing an insert to be disposed within and supported by the machined transition piece. The insert has walls with internal surfaces defining a first cylindrical portion with a constant diameter at least as large as the diameter of the orifice and disposed immediately above the orifice for allowing the flow stream from the orifice to fully enter the first portion and attach to the inner sides of the first portion and an outwardly flaring (conical or parabolic) second portion having a diameter which increases in the direction of fluid flow for allowing controlled expansion of fluid in the transition piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.