Closure system for a spent fuel storage cask
US4983352A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Nov 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F5/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A closure system of a spent fuel storage cask includes a lid assembly having a shield lid which is installed under water and which cooperates in the drainage of water from the cask. A primary cover having a spring energized metalic C-ring captured therein to provide a primary gas seal is then installed over the shield lid. Closable gas passages extending through the primary cover permit the primary gas seal to be tested by injecting pressurized gas on one side of the primary gas seal and testing for leakage on the other. A seal cover is installed over the primary cover and welded at its periphery to provide the secondary gas seal. The seal cover has a closable gas passage which allows pressurized gas to be injected between the primary cover and the sealed cover so that leaks at the secondary gas seal can be detected. The closure system may also include a gas pressure monitoring system which communicates with the interior of the cask and which can be recalibrated during long-term storage of spent fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.