Silicon avalanche photodiode linear-array detector with multichannel scaling system for pulsed synchrotron X-ray experiments

Kishimoto, Shunji*; Mitsui, Takaya; Haruki, Rie*; Yoda, Yoshitaka*; Taniguchi, Takashi*; Shimazaki, Shoichi*; Ikeno, Masahiro*; Saito, Masatoshi*; Tanaka, Manobu*

Journal of Instrumentation (Internet), 10(5), p.C05030_1 - C05030_6, 2015/05

https://doi.org/10.1088/1748-0221/10/05/C05030

Start-up test of experimental fast reactor "JOYO"; Nuclear power calibration and power distribution (Part 1), NT-41 : Nuclear power calibraion, NT-42-1 : Power distribution (Part-1)

Yamamoto, Hisashi*; Sekiguchi, Yoshiyuki*; *; *; Kawashima, Masatoshi*; *; *

PNC TN941 79-112, 156 Pages, 1979/07

PNC-TN941-79-112.pdf:4.67MB

This report describes the results of the Nuclear Power Calibration test and the Power Distribution measurements made on the core center axis by micro fission chambers. The nuclear power leve1 was determined from the relationship between the calculated reaction rates and the count rates obtained by the Pu239 micro fission chambers which were inserted in the Joyo core. The Pu239 chambers used in this test were previously calibrated in the known neutron field of a thermal reactor. The principal results of this test are as follows: (1)It was confirmed that the relationship between the SRMS count rates and nuclcar power level is linear in the range of 0.1KW 10 KW. (2)The SRMS and IRMS indicators overlap in the range of 1KW 10 KW. The IRMS indicators show, linearity with the power level a above 1 KW. (3)Five fission reaction rates, Pu239, Pu240, U235, U238 and Th232, were measured along the center axis of the core using micro fission chambers. The axial power peaking factor was 1.19. The measured value of axial peaking factor agreed with the one predicted by design. (4)The SRMS count rates increase about 8% when temperature of primary sodium increases by 100C. (5)The core fuel assemblies stored in the in-vessel fuel rack affect the count rates of the neutron monitoring system. When one core fuel assembly is loaded in a fuel rack position on a line connecting the core center and SRMS counters, the count rates increase about 25%. The additional nuclear characteristics determined in this teat are: (6)Isothermal temperature coefficient was -3.65 10 % //C (190C 250C) (7)The reactivity change due to the replacement of a normal core assembly at the core center with a special subassembly for this test was -0.085% /k.