Burg spectrum estimation of neutron noise for the monitoring of reactor internal vibration with a hypothesis test

• Published in: The International journal of pressure vessels and piping Vol. 77; no. 1; pp. 27 - 33
• Main Authors: Sim, C.-M., Chang, K.-O., Sohn, J.-M., Chon, B.-S., Baik, H.-K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2000; Elsevier
• Subjects: Beam mode; Burg spectrum estimation; Computational methods in fluid dynamics; Estimation; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Hypothesis test; Neutron noise analysis; Neutron physics; Neutron spectrometers; Non-parameter spectrum estimation; nondestructive testing; Nuclear engineering and nuclear power studies; Nuclear physics; Order selection; Physics; Reactor's internal structure monitoring; Shell mode; Structural analysis; Vibration measurement; Hypothesis test; Burg spectrum estimation; Shell mode; Order selection; Non-parameter spectrum estimation; Reactor's internal structure monitoring; Beam mode; Neutron noise analysis; Wavelet transforms; Bias; Measurement sensor; Neutrons; Non parametric estimation; Experimental study; Bilinear form; Vibrations; Reactors; Pumps; Internal structure; Coolants; System identification; Joints; Monitoring
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/S0308-0161(99)00072-1

Traditionally, non-parameter spectrum estimation has been widely used in the analysis of neutron noise obtained from ex-core detectors for reactor structure monitoring. Because a limited data results in a severe bias, the resolution is not adequate for a monitoring application. The Burg spectrum estimation of the parameter method distinctively traces the modes of the reactor's internal structures with the order of 160 tested by χ 2 (chi) distribution and F distribution. Fuel 1st mode, 2nd mode, beam mode and shell mode in association with a reactor's internal vibration are more discernable than the spectrum estimator method proposed in ASME-OM/SG part 5 with the neutron noise signals of Ulchin 1. The result gives us the early information of the joint condition between thermal shield and core support barrel.