[en] A comparison between the test data and a RELAP4 test prediction for the LOFT L1-5 test is presented and discussed. The LOFT L1-5 test is an isothermal test conducted with the nuclear core in place in a shutdown condition. The test prediction was conducted using standard practices for nodalizing and applying RELAP4 models. No attempts were made to adjust the test prediction model used herein based on observations from the data. Conclusions and observations concerning the ability of RELAP4 to model the LOFT L1-5 test are listed and discussed