We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience. Necessary Necessary. The Steam Bypass Valves are used for the warming and initial loading of the main turbine. During normal. In the event of a turbine trip, the Steam Bypass to Condenser. Control s bypass steam around the turbine to the condenser, maintaining steam pressure at a stable.
Invensys Operations Management is a world leader in feedwater control system implementation using. Using our unique technologies, Invensys has helped to improve startup times and runtime per for mance. And while operators are more in for med, less interaction is. With recent enhancements, Invensys Operations Management offers the proven best feedwater control.
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The controls were poorly tuned. Level perturbations were not uncommon during changes in power, with poor low level control. This reduced operator direct manual interaction, and thereby reduced operator challenges. The split range 3-element controls greatly reduce the perturbations associated with rotating those pumps. The operators, by that time, overcame their instinct to place the feedwater system in manual, and instead let the controls take action. Business Value Recent implementations have offered operation philosophy enhancements, improved startup and runtime per for mance and significant reduction of unplanned unit trip outages.
Recent implementations have offered operation philosophy enhancements, improved startup and runtime per for mance and significant reduction of unplanned unit trip outages. These advanced control techniques allow for less operator required interaction, more time of automatic control - including during start-up and shut-down when most unit trips are caused - making the entire control system more capable of handling process upset conditions along with normal operation.
To date, we have not tripped based on the DCS or garnered extra down time. There have been multiple similar incidents after which Operations commented that the unit would have tripped if the steam generator level control was not on the DCS. The system then had the tools to compensate for these characteristics and provide a better response to control actions. When starting the second pump, speed balancing used to be an operator-intensive manual procedure.
Our swap over from startup valve to main valve was greatly simplified. It used to be an operator manual swap that took about an hour to per for m. It is now an automatic event that occurs on they fly with no specific interaction required. I have seen a valve transfer occur as they were tying a turbine online and in single element with no significant level perturbations in the steam generators.
Gladney also stated how the controls were improved to have one set of tuning parameters, and one set of inputs. These allow the system to suffer a partial or complete loss of one of the redundant input signals with minimal or no upset to plant operation or loss of vital plant process in for mation. The redundancy starts at the process measurement transmitters.
Multiple, mutually exclusive field devices are used to measure the same plant process variable. Care is taken to also ensure that the transmitters are on separate process connections, otherwise they are still vulnerable to a single failure, such as plugged piping or failure of the sensing line piping itself.
Enhancement 1. When both transmitters are functioning properly, the Average of the two is used as the resultant controlling signal. Upon excessive deviation between the two measurements, or the failure of either one, control actions are prevented blocked , and an operator alarm generated.
Automatic control can resume and maintenance can be per for med on the bypassed signal without loss of runtime. Dual Transmitter Algorithms have been used for feedwater controls such as Feedwater Pump recirculation flows. Upon excessive deviation between the two measurements, or the failure of either one, the control system automatically selects the signal that is closer to the arbiter, and an operator alarm is generated.
Automatic control continues, uninterrupted. Enhancemen 1. When all are functioning properly, the Median of the three is used as the resultant controlling signal. Upon the failure of one signal, the control system automatically continues to select the Median value and automatic control continues, uninterrupted.
If one signal deviates significantly without failure, it is excluded from control by the Median selector. Variations of the triple input algorithm include: Using the Average of the three inputs — When all are functioning properly, the Average of the three is used as the resultant controlling signal. Upon the failure of one signal, the control system automatically reverts to the Average of the remaining two inputs and automatic control continues, uninterrupted.
Using the Median of the three inputs — When all are functioning properly, the Median of the three is used as the resultant controlling signal. If a failure is detected in one of the Fieldbus Modules, its output is driven to 0 mA and the corresponding channel in the tracking module automatically continues supplying the proper current to the output current loop.
Steam generator level is more robustly controlled using the three elements of steam flow, feedwater flow, and steam generator level. These manual transitions require intense operator involvement, and have been the cause of many unplanned unit trips. The enhanced design utilizes split ranging of the Start-up Bypass valve and the MFWR valve such that they sequence as if there is only one full range valve.
Advanced control techniques are utilized to enable the control system to control the transfer from Single Element to Three Element control during the times when reactor power is increasing, and from Three Element to Single Element control during times when reactor power is decreasing.
This allows the control system to be in Three Element control while still on the Start-up Bypass valve, improving the dynamic response of the control at a much lower power level than was attainable with the prior design.
The system closes the Start-up Bypass valve when appropriate and automatically transfers control from the Start-up Bypass valve to the MFWR valve without any operator intervention. For power shutdown, the system automatically transfers control from the MFWR valve back onto the Start-up Bypass valve. Both of these transfers occur without operator intervention. The automated transfers alleviate the operator from the time consuming and manually intensive transfers required in the older methodology.
The Three Element controller automatically reverts to Single Element control upon the loss of all Steam Flow or all Feedwater Flow signals, allowing Steam Generator level to be maintained under automatic control while maintenance can be per for med on the offending flow signals.
The following is a brief description other solutions provided for the nuclear industry outside of the feedwater control realm. CEA has five functions. The detectors produce a microampere signal that is converted to the sensed millivolt signal across a precision shunt resistor.
The signal values are recorded and instantaneous signals are made available for view. In for mation generated from the Incore Flux Monitoring function is used to support reactor engineering functions. Calculations are per for med and in for mation presented to the operations, engineering, and maintenance staffs.
The in for mation presentation is through small flat panel display devices showing spatially dedicated in for mation, operator and engineering workstation displays, printed reports, and on-demand historical trends. Both raw Unit in for mation as well as calculation and redundant sensor algorithm results are available for real-time and historical presentation.
For analog inputs not including redundant sensors, additional FBMs can be included to provide continuous monitoring of the same signal through the additional module. This design provides for continuity of operation for selected critical signals in the face of a signal channel failure or during the replacement of a failed module.
In the unlikely event that a channel Analog to Digital converter fails and emits a constant output, a deviation alarm can be generated when the two channels diverge. In for mation generated from the SOER function is used to support the engineering functions of post-trip review and transient analysis.
The current time is determined from the master timekeeper station that can be synchronized to GPS satellite signals. All control processors are thus synchronized in time, although their operation is asynchronous. A validated pressure value is obtained using the desired Redundant Signal algorithm such as the three input median selector.
The outputs to these signals can also be redundant to provide an additional measure of reliability. During normal plant operation, these valves are closed. In the event of a turbine trip, the Steam Bypass to Condenser Control s bypass steam around the turbine to the condenser, maintaining steam pressure at a stable value as the reactor is powered down and controls the rate of change of T AVG.
Using our unique technologies, Invensys has helped to improve startup times and runtime per for mance while reducing unplanned unit trip outages. And while operators are more in for med, less interaction is required because the control system manages normal operations and transient or abnormal incidents.
With recent enhancements, Invensys Operations Management offers the proven best feedwater control systems for Nuclear power generation. No part of the material protected by this copyright may be reproduced or utilized in any for m or by any means, electronic or mechanical, including photocopying, recording, broadcasting, or by any in for mation storage and retrieval system, without permission in writing from Invensys Systems , Inc.
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|Chrome dino||This reduced operator direct manual interaction, and thereby reduced operator challenges. Multiple, mutually exclusive field devices are used to measure the same plant process variable. The system closes the Start-up Bypass valve when appropriate and automatically transfers control from. And while operators are more in for med, less interaction is. Invensys Operations Management offers premiere feedwater control systems using. Candy Controls.|
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|Let go ghostlycheeks||Cancel Overwrite Save. It is a simple, elegant solution that eliminates traditional marshalling panels as we know it. There have been multiple similar incidents after which Operations commented that the unit would have tripped if the steam generator level control was not on the DCS. Thank you, for helping us keep this platform clean. Share from page:. Maintaining focus on product lifecycle management pays dividends for them in the long term. Using the Median of the three inputs — When all are functioning properly, the Median of the three is.|
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Nov. 8, - Invensys Operations Management introduced the next major evolution of its Foxboro I/A Series distributed control system. As the core DCS. Schneider Electric / Invensys / Foxboro PQM I/A Series Control Network Interface. Stock # Price: $1, Add to Cart. Would you prefer a quote. Superior architecture, long-lived and sophisticated yet easy-to-use interface. A vehicle for solving today's problems today – and providing for tomorrow's.