Fuel behavior studies in simulated reactivity initiated accident (RIA) conditions have been performed by utilizing Nuclear Safety Research Reactor (NSRR) since October 1975. This report describes the results obtained from experiments performed from January through December, 1987. A total of 38 tests was carried out during this period : those are 5 NSRR standard fuel test, 6 fuel design parameter tests (2 fuel tests with iodine, 3 tests with SUS claddings, and 1 for destructive force measurement test), 7 cooling parameter tests (3 test with flow tube and 4 bundle tests), 8 advanced type fuel tests (1 NRC tests, 5 PCI-resistant fuel tests, 2 pressurized hollow fuel tests), 1 high pressure / high temperature tests, 2 high temperature / high pressure loop tests, 3 high temperature flooding tests, 3 fuel motion observation tests, and 3 miscellaneous atmospheric pressure capsule tests (1 fuel damage test, 2 acceleration tests). The progress of computer code development is also described. (author).