Foxboro P0923NB-OC/P0923NAC Module

Foxboro Module P0923NB-OC/P0923NAC  I/A Series Best Price

Introduction

Before the I/A Series DCS was installed on the feedwater controls at the OmahaPublic Power District at Fort Calhoun Station, there were many operationalchallenges. The controls were poorly tuned. Level perturbations were not uncommonduring 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 valveallowed for automated controls to handle the switchover from the bypass to themain valve. This reduced operator direct manual interaction, and thereby reducedoperator challenges. We also rotate our Steam Generator Feedwater Pumps. 

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

There havebeen multiple similar incidents after which Operations commented that the unitwould have tripped if the steam generator level control was not on the DCS.

Foxboro Other Products

You May Like

FAQ

1.What about the warranty?

All products have a 1-year warranty.

2. What is the delivery time?

Usually 1-3 working days.

3. Other suppliers have better prices than you?

It is our belief to create the greatest benefit for our customers. If you have a better price, please let us know. We will do our best to meet your price and support you.