Foxboro SY-60301003RB Module

Foxboro SY-60301003RB Brand New PLC Module 

Introduction

The enhanced design utilizes split ranging of the Start-up Bypass valve and the MFWR valve such that theysequence as if there is only one full range valve. Advanced control techniques are utilized to enable the controlsystem to control the transfer from Single Element to Three Element control during the times when reactorpower is increasing, and from Three Element to Single Element control during times when reactor power isdecreasing. 

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 priordesign. The system closes the Start-up Bypass valve when appropriate and automatically transfers control fromthe Start-up Bypass valve to the MFWR valve without any operator intervention. For power shutdown, the systemautomatically transfers control from the MFWR valve back onto the Start-up Bypass valve. Both of these transfersoccur without operator intervention. The automated transfers alleviate the operator from the time consumingand manually intensive transfers required in the older methodology.

The Three Element controller automatically reverts to Single Element control upon the loss of all SteamFlow or all Feedwater Flow signals, allowing Steam Generator level to be maintained under automaticcontrol while maintenance can be performed on the offending flow signals.If all Steam Generator Level signals are lost, the Three Element/Single Element control system willtransfer to MANUAL,mitigating the degreeof level perturbations.The following is a briefdescription other solutionsprovided for the nuclearindustry outside of thefeedwater control realm.

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