Numerical validation of a modified neutron source multiplication method using a calculated eigenvalue

To overcome the difficulties of the conventional neutron source multiplication method, the authors have developed the Indirect Bias Estimation Method. This method obtains the bias in calculated Kerr using the difference between measured and calculated neutron count rates. This bias in calculated Kerr is used for an adjustment of the calculated Kerr, deriving a truer Kerr. Using neutron diffusion calculations, numerical experiments simulating the neutron source: multiplication method were performed to validate this method. It could be shown how closely a true Kerr can be reproduced using this method. It was found that an accurate estimation of subcriticality requires neutron count rate measurements at more than three locations