TY - JOUR
T1 - Online Fault Detection and Diagnosis of In-Core Neutron Detectors Using Generalized Likelihood Ratio Method
AU - Vidya Sagar, Yellapu
AU - Mishra, A. K.
AU - Tiwari, A. P.
AU - Degweker, S. B.
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Vanadium self-powered neutron detectors (VSPNDs) have been proposed to be used in the Advanced Heavy Water Reactor for flux mapping purposes. However, response of VSPNDs to neutron flux variations is slow, and they might also develop faults. This paper proposes a hybrid scheme for state estimation based on the Kalman filtering approach and fault detection, diagnosis, and correction based on the generalized likelihood ratio (GLR) method for VSPNDs. The Kalman filter estimates prompt neutron flux variations from the delayed signal of VSPND, while the GLR method analyzes the innovations to detect fault in VSPND. Subsequently, the scheme also corrects for the step changes in the measurement emanating from fault in VSPND. Performance of the proposed hybrid scheme has been evaluated from simulation of neutron flux variations occurring due to simultaneous movement of regulating rods and demand power variations. It is shown that the magnitude and time of occurrence of step change in signal due to the fault are effectively estimated, and thus the step change can be corrected online.
AB - Vanadium self-powered neutron detectors (VSPNDs) have been proposed to be used in the Advanced Heavy Water Reactor for flux mapping purposes. However, response of VSPNDs to neutron flux variations is slow, and they might also develop faults. This paper proposes a hybrid scheme for state estimation based on the Kalman filtering approach and fault detection, diagnosis, and correction based on the generalized likelihood ratio (GLR) method for VSPNDs. The Kalman filter estimates prompt neutron flux variations from the delayed signal of VSPND, while the GLR method analyzes the innovations to detect fault in VSPND. Subsequently, the scheme also corrects for the step changes in the measurement emanating from fault in VSPND. Performance of the proposed hybrid scheme has been evaluated from simulation of neutron flux variations occurring due to simultaneous movement of regulating rods and demand power variations. It is shown that the magnitude and time of occurrence of step change in signal due to the fault are effectively estimated, and thus the step change can be corrected online.
KW - Additive biases
KW - dynamic compensation
KW - fault detection and diagnosis
KW - generalized likelihood ratio (GLR) method
KW - Kalman filter
KW - vanadium self-powered neutron detectors (VSPNDs)
KW - whiteness test (WT)
UR - http://www.scopus.com/inward/record.url?scp=84961827915&partnerID=8YFLogxK
U2 - 10.1109/TNS.2015.2496599
DO - 10.1109/TNS.2015.2496599
M3 - Article
AN - SCOPUS:84961827915
VL - 62
SP - 3311
EP - 3323
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 6
M1 - 7348826
ER -