Test prediction for Semiscale Mod-3 Test S-SB-2: small break test series

This document contains a pretest analysis of the Semiscale Mod-3 system thermal-hydraulic response for the first test in the small break test series (Test S-SB-2). This test series was designed to be compatible with small break loss-of-coolant experiments defined for the Loss-of-Fluid Test (LOFT) Program and computer code calculations performed by the Code Assessment and Applications Program to predict pressurized water reactor (PWR) system behavior during a small break loss-of-coolant accident (LOCA). Results of the Semiscale small break tests will be used to investigate scaling effects pertinent to LOFT and Semiscale and to assess analytical models used in the computer codes. Test S-SB-2 is an integral small break loss-of-coolant test associated with the Semiscale small break test series. The primary objective of Test S-SB-2 is to provide information on the natural circulation phenomena and the potential for core uncovery which may result from the slow depressurization during a small break in the primary cold leg pipe near the vessel for the case where high pressure injection flow is not sufficient to makeup system mass discharged through the break.