Method and system for indicating the position of control rods of a nuclear reactor
US5563922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1995 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Oct 23, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and system for indicating the position of a nuclear reactor control rod which is suspended from a shaft sliding vertically inside a travel housing. Primary and secondary coils are wound around the travel housing and an AC current travelling through the primary coil induces a secondary voltage across the secondary coil and a primary voltage across a secondary coil of an isolation transformer. The primary and secondary AC voltages are low pass filtered, rectified into DC voltages, and low pass filtered a second time. The secondary DC voltage is divided by the primary DC voltage and a ratiometric signal is produced. The ratiometric signal is compensated by decoupled zero and span adjustments and by a temperature compensation adjustment. A linear correction offset is calculated from data stored in an EPROM and summed with the ratiometric signal yielding a module output signal which is a linear representation of the control rod position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.