Plugging of copper hollow conductors in water cooled generators is an issue occasionally encountered in large nuclear, fossil and hydro powered power plants, causing load limitations or even unplanned shut-down. A response is the proper choice of stator water chemistry and of the purification systems. The common water chemistry regimes are with low or high oxygen content, and neutral or alkaline pH in the stator water. All these regimes have proven to work in the field, but none is without problems. This can be due to various causes. There is one common trait however: problems arise when the system is being exposed for any length of time to a regime it was not designed for. Stainless steel hollow conductors have only simple requirements on water chemistry. Hollow conductor plugging can lead to overheating and possibly to catastrophic failure, so swift action to remedy the situation is recommended. There are several options. Hot reverse flush can remove debris and temporarily open up the plugs, and mechanical cleaning can open totally blocked hollow conductors. There are several methods for chemical cleaning, the most common being different forms of acid cleaning and EDTA cleaning. The former has the disadvantage of dissolving base metal and brazing as well as the oxides, while the latter method manipulates less aggressive substances that only dissolve the copper oxides in the system.
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2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
July 30–August 3, 2012
Anaheim, California, USA
Conference Sponsors:
- Nuclear Engineering Division
- Power Division
ISBN:
978-0-7918-4497-7
PROCEEDINGS PAPER
Operation and Maintenance Solutions for Generator Water Cooling Available to Purchase
Matthias Svoboda,
Matthias Svoboda
Alstom Thermal Services, Baden, Switzerland
Search for other works by this author on:
Robert Svoboda
Robert Svoboda
Alstom Thermal Services, Baden, Switzerland
Search for other works by this author on:
Matthias Svoboda
Alstom Thermal Services, Baden, Switzerland
Robert Svoboda
Alstom Thermal Services, Baden, Switzerland
Paper No:
ICONE20-POWER2012-54555, pp. 797-803; 7 pages
Published Online:
October 30, 2013
Citation
Svoboda, M, & Svoboda, R. "Operation and Maintenance Solutions for Generator Water Cooling." Proceedings of the 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries. Anaheim, California, USA. July 30–August 3, 2012. pp. 797-803. ASME. https://doi.org/10.1115/ICONE20-POWER2012-54555
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