Traversing In-Core Probe Drive Unit and Method for Monitoring Friction of Inside of Guide Tubes
a technology of drive unit and guide tube, which is applied in the direction of nuclear engineering, greenhouse gas reduction, nuclear elements, etc., can solve the problems of lubricant falling away or reducing, affecting the sensitivity of the lprms, and damaging the tip and the probe cabl
Inactive Publication Date: 2012-01-05
KK TOSHIBA
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However, the LPRMs are placed in the reactor constantly and difficult to be replaced, and the sensitivity of the LPRMs declines with time.
This lubricant may fall away or may be diminished due to moving of the TIP and the probe cable.
In the result, there is a possibility of damaging the TIP and the probe cable when the TIP and the probe cable move at a position where the lubricant fell away.
Moreover, because the probe cable in the TIP system is radioactivated, there is a possibility that utility workers are exposed to radiation when the measurement takes a long time.
However, in this TIP system, due to deterioration of the torque sensor, it is difficult to calculate the cable drive torque stably.
However, in this TIP system, an inverter driving the motor generates high-frequency noise, and the signal indicating fluctuations of torque may hide amongst this noise.
In the result, it is difficult to calculate the cable drive torque exactly.
Method used
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[0021]Reference will now be made in detail to the present embodiment of the invention, an example of which is illustrated in the accompanying drawing. Wherever possible, the same reference numbers will be used throughout the drawing to refer to the same or like parts.
[0022]Referring to FIG. 1 of the drawing, in a reactor container 31, a reactor pressure vessel 33 is stabilized on a pedestal 32. According to one exemplary embodiment, a TIP system 200 includes a TIP drive unit 1, a probe cable 11, a TIP 12, a shielding vessel 21, an indexing device 22, guide tubes 23, and calibration tubes 24.
[0023]Furthermore, according to one exemplary embodiment, the TIP drive unit 1 includes a housing 2, an introduction path 3, a storage reel 4, a motor 5, a reduction gear 6, a control unit 7, a processor 8, a motor controller 9, and a noise filter 13.
[0024]As shown FIG. 1, the housing 2 of the TIP drive unit 1 is provided outside of the reactor container 31. The introduction path 3 penetrates the...
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A TIP drive unit that calculates a cable drive torque stably is provided. In accordance with the invention, Traversing In-core Probe (TIP) drive unit includes a housing, a storage reel configured to storage the probe cable, a drive mechanism including a motor, and configured to feed the probe cable form the storage reel and spool the probe cable onto the storage reel, a motor controller configured to drive the motor at a predefined rotating speed, a processor configured to calculate a cable drive torque that is a torque necessary for moving the TIP and the probe cable by using a value of supply power necessary for driving the motor, a value of the predefined rotating speed of the motor, and a loss torque that is a torque necessary for driving the drive mechanism, and a noise filter configured to remove noise included in a signal indicating the value of the supply power.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2010-150436, filed on Jun. 30, 2010, the entire content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention is a Traversing in-core probe (TIP) drive unit that moves a TIP in a nuclear reactor by feeding and spooling a probe cable in the reactor. More particularly, the invention is directed to a TIP drive unit that calculates a cable drive torque stably.BACKGROUND OF THE INVENTION[0003]In order to measure neutron flux distribution in a nuclear reactor, Local Power Range Monitors (LPRMs) are provided in the reactor. However, the LPRMs are placed in the reactor constantly and difficult to be replaced, and the sensitivity of the LPRMs declines with time. Therefore, the sensitivity of LPRMs needs to be calibrated arbitrarily in order to measure neutron flux distribution in the reactor exactly.[0004]I...
Claims
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Login to View More IPC IPC(8): B65H43/00
CPCG21C17/10Y02E30/30
Inventor YASUTA, HIDEHIKOKATO, HIROMI
Owner KK TOSHIBA