DSpaceCRIS@UNITENhttp://dspace.uniten.edu.my/jspuiThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Fri, 24 May 2019 21:51:10 GMT2019-05-24T21:51:10Z5021- A study on the optimal position for the secondary neutron source in pwrshttp://dspace.uniten.edu.my/jspui/handle/123456789/8972Title: A study on the optimal position for the secondary neutron source in pwrs
Authors: Sun, J.; Yahya, M.-S.; Kim, Y.
Abstract: This paper presents a new and efficient scheme to determine the optimal neutron source position in a model near-equilibrium PWR reactor, which is based on the OPR1000 Hanul Unit 3 Cycle 7 configuration. The proposed scheme particularly assigns importance of source positions according to local adjoint flux distribution. In this research, detailed pin-by-pin reactor adjoint fluxes are determined by using Monte Carlo KENO-VI code from solutions of the reactor homogeneous subcritical adjoint transport equations. The adjoint fluxes at each allowable source position are subsequently ranked to yield four candidate positions with the four highest adjoint fluxes. The study next simulates excore detector responses using the Monte Carlo MAVRIC code by assuming a neutron source installed in one of the four candidate positions. The calculation is repeated for all positions. These detector responses are later converted into inverse count rate ratio (ICRR) curve for each candidate source position. The study confirms that the optimal source position is the one with the highest adjoint fluxes, as it yields a more linear ICRR curve. The current work demonstrates that the adjoint flux-based approach can be used to determine efficiently the optimal geometry for a pair of neutron source and detector in a modern PWR core.
Fri, 01 Jan 2016 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/89722016-01-01T00:00:00Z
- A Study on the Optimal Position for the Secondary Neutron Source in Pressurized Water Reactorshttp://dspace.uniten.edu.my/jspui/handle/123456789/8967Title: A Study on the Optimal Position for the Secondary Neutron Source in Pressurized Water Reactors
Authors: Sun, J.; Yahya, M.-S.; Kim, Y.
Abstract: This paper presents a new and efficient scheme to determine the optimal neutron source position in a model near-equilibrium pressurized water reactor, which is based on the OPR1000 Hanul Unit 3 Cycle 7 configuration. The proposed scheme particularly assigns importance of source positions according to the local adjoint flux distribution. In this research, detailed pin-by-pin reactor adjoint fluxes are determined by using the Monte Carlo KENO-VI code from solutions of the reactor homogeneous critical adjoint transport equations. The adjoint fluxes at each allowable source position are subsequently ranked to yield four candidate positions with the four highest adjoint fluxes. The study next simulates ex-core detector responses using the Monte Carlo MAVRIC code by assuming a neutron source is installed in one of the four candidate positions. The calculation is repeated for all positions. These detector responses are later converted into an inverse count rate ratio curve for each candidate source position. The study confirms that the optimal source position is the one with very high adjoint fluxes and detector responses, which is interestingly the original source position in the OPR1000 core, as it yields an inverse count rate ratio curve closest to the traditional 1/M line. The current work also clearly demonstrates that the proposed adjoint flux-based approach can be used to efficiently determine the optimal geometry for a neutron source and a detector in a modern pressurized water reactor core. © 2016
Fri, 01 Jan 2016 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/89672016-01-01T00:00:00Z