Computer Code for Large Leak Sodium-Water Reaction Analysis (SWACS/REG3) (Input Manual); Large Leak Sodium-Water Reaction Analysis (Report No.7)

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Miyake, Osamu*; Shindo, Yoshihisa*; Sato, Minoru*

Miyake, Osamu*; Shindo, Yoshihisa*; Sato, Minoru*

A computer code, SWACS, has been developed for analyzing a large-scale sodium-water reaction accident in a steam generator system of LMFBRs. The SWACS integrated code system is capable of predicting the principal events relevant to the large-scale water leak accident in the steam generator of LMFBRs: leaking flow of water/steam mixture from a ruptured heat-transfer tube into sodium in any one of the steam generators; propagation of pressure wave generated by sodium-water reaction both within the faulted steam generator and into the secondary cooling system ; and hydraulic transients induced in the secondary cooling circuit and reaction relief system. The water/steam leaks postulated in the SWACS code are, in principle, equivalent to those from the breach of one double-ended (guillotine) rupture of heat-transfer tube. This report is an input manual of the SWACS code and describes the structure of SWACS, input/output format and sample cases for demonstration. It is to be noted that a companion volume (PNC SN952-79-19) explains the underlying models and numerical methods adopted in the SWACS code.