Good DCS

Foxboro Module P0913LJ-OB/P0913QQ/P0913LKBI/A Series Best Price

Introduction

Before the I/A Series DCS was installed on the feedwater controls at the Omaha Public Power District at Fort Calhoun Station, there were many operational challenges. The controls were poorly tuned. Level perturbations were not uncommon during changes in power, with poor low level control. John Steinke, Senior Nuclear Design Engineer at the facility states that “Having splitrange 3-Element control on the bypass feed water valve as well as the main valve allowed for automated controls to handle the switchover from the bypass to the main valve. This reduced operator direct manual interaction, and thereby reduced operator challenges. We also rotate our Steam Generator Feedwater Pumps.

The split range 3-element controls greatly reduce the perturbations associated with rotating those pumps. More precise tuning and control have maximized our unit’s capability factor (ability to produce electricity) while removing undue burden from the Licensed Operators who are operating the system. To date, we have not tripped based on the DCS or garnered extra down time.” There was a plant transient soon after the controls were installed in which the Hotwell Makeup Valve failed to open. The operators, by that time, overcame their instinct to place the feedwater system in manual, and instead let the controls take action. The feedwater DCS response was called “outstanding.” It would have been a much more stressful event for operations using the pre-DCS controls.

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.

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All products have a 1-year warranty.

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