EMERSON NA-0112 Ovation®-based Computerenhanced Rod Position Indication System
EMERSON NA-0112 Ovation®-based Computerenhanced Rod Position Indication System
Description
This system replaces the electronics portion of the ARPI system within Westinghouse plants. The system consists of a detector interface board for each rod, redundant Ovation controllers and a new computerized human-machine interface (HMI). This resolves the issues of difficult and timely calibration and inaccurate position indication for rods across the power range.
A rod drop test system is included as part of this upgrade. Plant technical specifications require rod drop time testing following a refueling outage so that the rods insert properly and within the time-response requirements of the plant’s safety analysis. This system reduces critical path time by automatically analyzing the data from each rod during a reactor trip and displaying the results.
Functions include:
• Control rod position indication
• Control rod bottom alarm
• Detector temperature compensation
• Detector linearity compensation
• Operator alarm capability
• One-pass calibration
Features
• Low-cost installation
Utilizes the existing linear voltage transducer (LVTs), eliminating as-low-as-reasonably-achievable concerns and cost.
• One-pass calibration
The Ovation-based computer-enhanced rod position indication system provides simplified, computercontrolled, non-interactive, zero and span (gain) adjustments.
• Computer algorithm compensation
Detector ambient temperature and the non-linearity of the LVT sensors have been compensated for utilizing custom algorithms based on operating experience.
• Low detector crosstalk
Two different frequencies are used to drive rod LVTs, minimizing the negative effect of detector crosstalk.
• Maintenance and Test Panel
Maintenance programs provide calibration history as well as single, click-of-the-mouse, computer-controlled calibration for zero and span settings.
• Operator Modules
Operator modules are provided to enhance the operator’s capabilities. The rod information is directed to control board-mounted flat panel displays and existing plant
Benefits
• Elimination of deratings and callouts as a result of limiting condition of operation entry from ARPIincreased profit
• Minimization of rod position indication calibration in start up, resulting in reduced critical path time
• Accurate indication of rod position, resulting in increased operator confidence
• Elimination of ARPI work-arounds, serving to increase operator efficiency
• High reliability resulting in lower O&M cost
• Existing installations provide low-risk solution
• Direct replacement for ARPI and low-cost installation
• For rod drop testing, the ability to automatically perform trending analysis that compares rod drops over time
- User name Member Level Quantity Specification Purchase Date
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