LOUREIRO, CESAR A.D.SANTOS, ADIMIR dos2014-11-172014-11-182015-04-022014-11-172014-11-182015-04-02LOUREIRO, CESAR A.D.; SANTOS, ADIMIR dos. Inverse kinetics method with source term for subcriticality measurements during criticality approach in the IPEN/MB-01 research reactor. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st, September 27 - October 2, 2009, Rio de Janeiro, RJ. <b>Proceedings...</b> DisponÃvel em: http://repositorio.ipen.br/handle/123456789/16635.http://repositorio.ipen.br/handle/123456789/16635In reactor physics tests which are performed at the startup after refueling the commercial PWRs, it is important to monitor subcriticality continuously during criticality approach. Reactivity measurements by the inverse kinetics method are widely used during the operation of a nuclear reactor and it is possible to perform an online reactivity measurement based on the point reactor kinetics equations. This technique is successful applied at sufficiently high power level or to a core without an external neutron source where the neutron source term in point reactor kinetics equations may be neglected. For operation at low power levels, the contribution of the neutron source must be taken into account and this implies the knowledge of a quantity proportional to the source strength, and then it should be determined. Some experiments have been performed in the IPEN/MB-01 Research Reactor for the determination of the Source Term, using the Least Square Inverse Kinetics Method (LSIKM). A digital reactivity meter which neglects the source term is used to calculate the reactivity and then the source term can be determined by the LSIKM. After determining the source term, its value can be added to the algorithm and the reactivity can be determined again, considering the source term. The new digital reactivity meter can be used now to monitor reactivity during the criticality approach and the measured value for the reactivity is more precise than the meter which neglects the source term.openAccesscomputerized simulationcriticalityexperimental datafuel rodsipen-mb-1 reactorm codesreactivity metersreactor kinetics equationsreactor kineticsreactor safetyrod drop methodsource termsInverse kinetics method with source term for subcriticality measurements during criticality approach in the IPEN/MB-01 research reactorTexto completo de eventohttps://orcid.org/0000-0002-5989-5705