[en] This report describes the analytical models and computer programs to be used for performing Appendix K ECCS analyses for a small Loss-of-Coolant accident, which occurs during operation with a loop out of service (N-1 Configuration) on a plant without Loop Isolation Valves (LIV) or for plants which are not utilizing their loop isolation valves. Results of analyses for a Westinghouse 4 loop (17 x 17 fueled) plant having a 14 foot core are presented along with appropriate sensitivity studies to qualify the revised programs and models. The revised programs and models described in this report, in the judgement of Westinghouse, are in conformance with the requirements of Appendix K 10 CFR 50.46 and are applicable to all Westinghouse plants with 14 x 14, 15 x 15, 16 x 16, 17 x 17 fuel rod arrays. In fact, the modifications to the computer programs and models consist solely of extensions of existing programs to allow the modelling of the out of service loop using techniques that have been previously approved or are being submitted in parallel with this report. Therefore, it is recommended that the codes and models be approved for all future Westinghouse ECCS analyses for a small Loss-of-coolant accident which occurs during operation with a loop out of service on a plant without LIV's or for plants which are not utilizing their LIV's