The two types of motors used in large glandless pumps and their relative merits as circulators in the primary circuits of water-cooled nuclear power reactors are discussed. The paper then reviews over 40 pump-years of operational experience with nine glandless pumps of the wet stator type in the primary circuits of the Agesta (Stockholm) and the S.G.H.W.R. (Winfrith) reactors. All the incidents known to the authors are reported. Methods of excluding radioactive particles from motors are detailed and data on present activity levels in both pumps and motors are given. The problems of windmilling owing to flow through an idle pump are discussed with test results.
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References
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Born. ‘Pumps for primary circuits’, Nucl. Engng1967 (December).
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‘Operating experience at the Agesta nuclear power station’, AE-2461966 (Aktiebolaget Atomenergi, Stockholm).
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SmithD.EnglishD.McCrickardJ. ‘Commissioning and operating experience with the Winfrith S. G. H. W. R.’, Atom1968 (July), No. 141.
