Bruce NGS: Assessment of Calandria Tube btegtity Fallowing a Sudden Ptessupe Tube Failure

Abstract

The issue of calandria tube integrity following a sudden rupture of the pressure tube in Brace NGS is addressed in this paper. During this accident scenario, the CT is subjected to severe pressure and impact loading. The paper focuses on the transient stage in which the annulus pressure usually exceeds the header pressure due to a waterhammer type pressure transient. A detailed sensitivity study of the thermal-hydraulic response of the fuel channel and the gas annulus during the transient is presented. Based on this sensitivity study results, the margin to calandria tube failure is also evaluated.