Measurement of keff with an improved neutron source multiplication method based on numerical analvsisEnglish Full Text
YE Bin;ZENG Li-Na;YIN Yan-Peng;YANG Chao-Wen;ZHENG Chun;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics;College of Physical Science and Technology,Sichuan University;
Abstract: In this work,we developed a numerical analysis-associated experiment method to determine the effective multiplication factor keff,which is difficult to obtain directly from conventional neutron source multiplication(NSM)method.The method is based on the relationship between keff,subcritical multiplication factor ks and external neutron source efficiency Φ* in the subcritical system.On basis of the theoretical analysis,the dependence of ks and Φ* on subcriticality and source position was investigated at the Chinese Fast Burst Reactor-Ⅱ(CFBR-Ⅱ).A series of ks were measured by NSM experiments at four subcritical states(keff = 0.996,0.994,0.991 and0.986) with the 252Cf neutron source located at different positions(from the system center to outside) at each subcritical states.The Φ* was obtained by Monte-Carlo simulation for each condition.With the measured ks and calculated Φ*,keff of the subcritical system was evaluated with a relative difference of < 1%between values obtained by the improved method and by positive period method.Especially,the relative difference of < 0.18%with the source located at the system center.
- DOI:
10.13538/j.1001-8042/nst.25.020602
- Series:
- Subject:
- Classification Code:
O571.53
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