Abstract
While CANDU heat transport pumps are effectively demonstrating their reliability in the most reliable reactors in the world, the current level of reliability was only achieved after ongoing refinements to the original design. Each design modification was initiated in response to a problem, with reliability taking precedence over cost and efficiency so that each modification has predictably increased pump reliability. Seal reliability, a problem with most large, high temperature pumps, has through an extensive research and development program been improved to a point where a reliable lifetime of about five years can be expected. Co-operative research and development programs at bearing manufacturers facilities and at AECL's Engineering Laboratory have resulted in no bearing related pump incapabilities at either Pickering or Bruce nuclear generating stations. Motor windings, a source of unreliability at the Bruce station, have been improved through the introduction of better turn insulation and additional surge protection. Refinements to the current pump design will continue and AECL is placing particular emphasis on evaluating pump performance in post-LOCA conditions.
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