Development of in-reactor observation system using Cherenkov light, 5

Otsuka, Noriaki ; Takeuchi, Tomoaki   ; Yamamoto, Keiichi; Shibata, Akira ; Kimura, Nobuaki ; Takemoto, Noriyuki ; Tanimoto, Masataka ; Tsuchiya, Kunihiko ; Sano, Tadafumi*; Unesaki, Hironobu*; Fujihara, Yasuyuki*; Takahashi, Yoshiyuki*; Nakajima, Ken*

Investigation of a relation between reactor power and brightness of Cherenkov light at Kyoto University Research reactor (KUR) by a CCD camera was performed due to a development of a real-time in-core measurement technique using Cherenkov light. Analyzing the brightness value of individual RGB color component at each pixel, some of the G and B brightness values reached the maximum value of 8-bit binary number, i.e. 255, above about 2-3 MW. Therefore, we corrected the G and B brightness values by the R signals whose brightness value did not saturate even at 5 MW, the maximum reactor power of KUR. Then, the total brightness value was in proportion to the reactor power after the correction. These results indicate the reactor power can be estimated by the observation of Cherenkov light.