Head Access Piping System Desing

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PNC made design studies on loop type FBR plants:a 600 MWe class in '91, and a 1300 MWe class in '93 both with the "head access" primary piping system. This paper focuses on the features of the smaller plant at first and afterwards on the extension to the larger one. The contents of the paper consist of R/V wall protection mechanism, primary piping circuit, secondary piping circuit, plant layout and then, discusses the extension of the applicability of the wall protection mechanism, primary piping and equipment to the larger plant. Through these studies PNC reached the conclusion that the "head access" concept is applicable to all cases of FBRs from the demonstration to commercial phase.