[en] Reduced instrument responses are presented for Thermal-Hydraulic Test Facility (THTF) test 158, which is part of the ORNL Pressurized-Water Reactor (PWR) Blowdown Heat Transfer Separate-Effects Program. The objective of the program is to investigate the thermal-hydraulic phenomenon governing the energy transfer and transport processes that occur during a loss-of-coolant accident in a PWR system. Test 158 was conducted to obtain CHF information in the THTF bundle 1 operating at nominal power, containing four unpowered rods, having significant outlet subcooling, and utilizing a 30 to 70% break ratio