ESI Products

Annunciator

DESCRIPTION OF THE MODIFICATION FOR A LUNDEL TYPE SYSTEM REPLACEMENT:

Existing systems use an old obsolete analog system to provide alarm functions. Due to maintenance problems associated with the obsolete design, the existing Annunciator System will be replaced with a networked PLC based system. The replacement system will be transparent to Operations as much as possible with the exception of the added capability to receive multiple alarm inputs and to provide status of all alarms to the Plant Computer System.

Annunciator Window Box Replacements:

•The existing annunciator hardware will be removed and the dual redundant PLCs and associated hardware will be mounted inside the original enclosure facing the rear of each Main Control Room (MCR) panel.

•The existing field wiring will land on new terminal blocks and jumpered to allow both PLCs to have identical auctioneered inputs. The field contact input at each input card is optically isolated and fused to minimize the impact of a hot short disabling both PLCs and cause a loss of Annunciation at its associated Window Box.

•The alarm detection scheme is designed such that a detected alarm is annunciated through optically coupled outputs which provide 24VDC power to its respective window box LED. The detected alarm is then transmitted via network capability to multi input Ethernet cards for connection to the Host computer. The Ethernet circuits will provide the redundant inputs to the Host Computer and Plant Computer System.

•The Host computer, located in the MCR provides a means of bypassing alarms, and provides an interface with the Plant Computer System such that any alarm points may be displayed on ICS. This will also provide an Operator Interface to allow bypassing (inhibiting) any alarms with out lifting alarm input wiring. The bypassing of any alarms will be administratively controlled by plant procedures. The host computer – ICS interface may also be used to provide a listing of any alarms in bypassed when requested by the operators.

•The silence, acknowledge, reset and test hands witches will be installed on the MCR panels.

••Alarm windows are relocated between MCR panels to comply with Human Factors Engineering standards.

DESCRIPTION OF THE MODIFICATION FOR A RONAN TYPE SYSTEM REPLACEMENT:

This Annunciator modification replaces the obsolete Ronan Model C Annunciator System with modern processors and operator interface. The replacement system uses the existing Ronan multiplexer cabinets and will be transparent to Operations as much as possible with the exception of the added capability to receive multiple alarm inputs and to provide status of all alarms to the Plant Computer System. The functional design of this system includes:

•Redundant remote collection of Inputs

•Redundant communication paths

•High-availability system processing

•Diverse presentation to the Operator with Lamp Boxes and optional Video Touch Screens

•Redundant Lamp Box and horn operation

•Basic Alarm prioritization and presentation on HMI Screens