Method and apparatus for removal of residual sludge from a nuclear steam generator
US4676201A · kind A · utility
32Cited by
17References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1984 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Jul 25, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A sludge lancing method comprises providing a lancing nozzle and a barrier nozzle for respectively emitting cleaning and barrier streams of fluid along two channels between columns of heat exchange tubes in a nuclear steam generator vessel, the two channels being spaced apart by at least two columns of tubes. The barrier stream prevents dislodged sludge from being moved laterally past it into previously cleaned areas. The streams may be rotated between the center and the periphery of the tube sheet. The barrier nozzle comprises three jets angularly disposed with respect to one another for increased coverage of the barrier channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.