Attached is the Experiment Prediction for LOFT Experim~nt Ll-4. This report contains the WHAM and RELAP4 ~omputer code predictions of the thermal-hydraulic response of th~ LOFT system during subcooled and saturated blowdown. We welcome your comments.

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Operating pressure Operating temperature Volume between quick-opening valve and upstream b,-ock valve (each) Flow area of quick-opening valve ' Minimum opening time of quickopening valve (I, 7 Value 7.73 m 3 155 bar 282 °C 48 liter 0.05 m 2 "'14 msec shown in Figure 3 ef Reference 1. As a result, the LOFT PSS is not a scaled version of a MARK series PSS. The relevance of the information obtained from the LOFT PSS experiments to the MARK PSS series is discussed in Section II-5. 2. QUALIFICATION BY EXPERIMENT •After assembly of the LOFT •facility was •completed, qualification of the systems began through prescribed functional testing programs. ..Two area~ of qualification were required. on th'it ~.vstems• <;omponents shown in 9 ' 12 PEeSV-2.2 1. 9690 ?4