Title:
MODERATOR TEMPERATURE COEFFICIENT MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/020542
Kind Code:
A1
Abstract:
A moderator temperature coefficient measuring device comprises an acquiring section
for acquiring plant data including a coolant temperature signal which represents
time-series data on the temperature of the coolant of a light-water reactor and
a neutron flux signal which represents time-series detected values of neutron
flux generated from the light-water reactor, a singular value decomposing section
for decomposing the coolant temperature signal into N components T'1(t)
to T'N(t) by the singular value decomposition method and decomposing
the neutron flux signal into M components ρ'1(t) to
ρ'M(t) by the singular value decomposition method, a
combining section for making a selected component combination of T'i(t) selected
from the N components T'1(t) to T'N(t) and
ρ'j(t) selected from the M components ρ'1(t) to
ρ'M(t), and temperature coefficient calculating section
for calculating the moderator temperature coefficient by using auto- and cross-power
spectrum density function obtained by Fourier transform of the selected component
combination. With such a structure, the moderator temperature coefficient
can be detected with high sensitivity without varying the plant state.
Inventors:
SATO DAISUKE (JP)
NAKANO MAKOTO (JP)
KIMURA JUN (JP)
NAKANO MAKOTO (JP)
KIMURA JUN (JP)
Application Number:
PCT/JP2007/064897
Publication Date:
February 21, 2008
Filing Date:
July 30, 2007
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
SATO DAISUKE (JP)
NAKANO MAKOTO (JP)
KIMURA JUN (JP)
SATO DAISUKE (JP)
NAKANO MAKOTO (JP)
KIMURA JUN (JP)
International Classes:
G21C17/00; G21C17/038
Foreign References:
| JPH0384496A | 1991-04-10 | |||
| JP2006105814A | 2006-04-20 | |||
| JPS58124995A | 1983-07-25 | |||
| JP2001255391A | 2001-09-21 | |||
| JP2005134291A | 2005-05-26 |
Other References:
MIYAMOTO H. ET AL.: "L30 PWR ni Okeru Tokuichi Bunkaiho o Mochiita Noise Bunsekiho ni yoru Gensokuzai Ondo Han'nodo Keisuu no Hyoka no Kento (Evaluation of moderator temperature coefficient using noise analysis method and singular value decomposition method)", ATOMIC ENERGY SOCIETY OF JAPAN '2006 NEN AKI NO TAIKAI', 17 August 2006 (2006-08-17), XP003021078
Attorney, Agent or Firm:
KUDOH, Minoru (24-10 Minamiooi 6-chom, Shinagawa-ku Tokyo 13, JP)
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