engleski

RELAP5/Mod. 3.3 Analysis of the SGTR LOBI Experiment BL-21

In this paper the post-test analysis of the LOBI-21 experiment performed with RELAP5/MOD3.3 code is discussed. The Steam Generator Tube Rupture (SGTR) experiment was performed in January 1987 in LOBI facility. One of the main reasons for the experiment was to check the efficiency of the primary circuit depressurization system, which should enable accumulators to intervene even during the high pressure LOCA transients. LOBI BL-21 experiment was initiated by the opening of the valve simulating 3 U tube rupture in reference plant. Primary pressure dropped until primary and secondary pressure were almost equalized. Primary coolant continued to exit through the break until the dry-out occurred. At that point primary circuit depressurization system (SSN, Sistema Salvataggio Nocciolo) was activated. This was one of the several transients considered to be used in the certification procedure of the nodalisation of the new nuclear power plant.

RELAP; SGTR; LOBI

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