The radiation levels in the reactor plant boiler chambers during plant operation were determined. The mean radiation level in the lC boiler compartment with the 1A, lB, and lD coolant loops in service at 45% reactor power was 0.5 mr/ hr wlth the plant ut 85% power (59 Mw gross) the mean radiation level was 0.56 mr/ hr. The data for Channel 5 of the operational radiation monitoring system contains consistent zero readings for parts of this test. An explanation for these readings may be that the channel was not functioning properly if at all, or the channel was not properly read. (auth)