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Kimura, Nobuaki; Takemoto, Noriyuki; Nagata, Hiroshi; Kimura, Akihiro; Naka, Michihiro; Nishikata, Kaori; Tanimoto, Masataka; Tsuchiya, Kunihiko; Sano, Tadafumi*; Unesaki, Hironobu*; et al.
KURRI Progress Report 2011, P. 219, 2012/10
In research reactors, a CCD camera is used to observe reactor core for reactor operation management, e.g. to prevent debris falling. In order to measure the reactor power and fuel burnup exactly by means of observation of Cherenkov light and 
ray information, the development of the on-line measurement device has been started since 2009. In this study, as a part of development of in-reactor surveillance, wavelength and absolute irradiance of Cherenkov light were measured by spectroscopy, and Cherenkov light was observed by the CCD camera. The neutral density filters (ND-filters) were used to investigate the transmittance of Cherenkov light in these measurements.
Nishihara, Kenji; Sugawara, Takanori; Iwamoto, Hiroki; Pyeon, C. H.*; Yagi, Takahiro*
KURRI Progress Report 2011, P. 221, 2012/10
The maximum likelihood analysis method for pulse neutron source experiment (PNS-ML) has been developed in experiments using KUCA to monitor sub-criticality of an accelerator-driven system (ADS). In this technique, the most likely sub-criticality can be deduced from a series of counted data from a detector. In the present study, both sub-criticality and neutron generation time are deduced from the same counted data.
