[en] This report concerns analysis by the domestic evaluation code ALARM-P1 of LOFT nonnuclear test series L1 experiment 2 which was conducted at the Idaho National Engineering Laboratory (INEL) as system level tests. This L1 experiment was attempted with the aim of providing the basic and valuable data for nuclear tests with active core scheduled in the forthcoming future. As preliminary prior to nuclear tests, a simple blowdown experiment (L1 - 2) was performed in which the core is only composed of a configuration simulating frictional resistance and overall experimental facility is maintained isothermally without ECC water injection. At the beginning of computation, input data were chosen from RELAP-4J data used by the LOFT analysis group of Reactor Safety Laboratory 1 and then converted as relevant to the ALARM-P1 input specifications. The purpose of analysis performed is not only to obtain a better understanding of blowdown phenomenon, but also to clarify validity or system performance characteristics of ALARM-P1 code (version 3). By the large, good agreements were obtained between calculational results and experimental data. (author)