Paragon has reverse engineered the rod block monitor (RBM) circuit cards and power supplies for a U.S. nuclear power plant.

Our reverse engineered units have the same form, fit, and function as the originals and can be installed in the RBM pages with no modifications.


The reverse engineered units were designed to be drop-in replacements that required no field work at the power plant. The circuit boards and metalwork were all built to the original unit dimensions. Test jack locations were maintained in similar locations as the original so there would be no learning curve for maintenance or operations personnel.

The traces on the circuit boards were routed as close to the original design as possible to reduce and/or eliminate any EMI/RFI risks. Any deviations due to component obsolescence were documented indicating the replacement had retained the same form, fit, and function as the original component. All circuit boards were manufactured to IPC-610, Class 2 Specifications.


The circuit cards were designed and built as non-safety related per the customer’s request, however, if needed, the designs can be updated and tested for safety-related applications. All units were functionally tested based on the critical design characteristics of that unit, developed from the original design, industry OPEX, and site procedures.

Part Numbers

The part numbers below have been reverse engineered by Paragon and are available for manufacture. Click on each part number to link to the Paragon Catalog.

Part Number


115D6320BBG002/ATC Meter Panel
135B9879G001/ATC 5V Power Supply
136B1308G002/ATC Averaging Card
136B1308G007/ATC Averaging Card
136B1356G002/ATC Driver Card
136B2772AAG002/ATC 15V Regulator
136B3101AAG001/ATC First Level Multiplexer
136B3109AAG002/ATC Flow Control Trip Reference
136B3117AAG001/ATC Gain Change Card
136B3118AAG001/ATC Quad Trip
136B3118AAG002/ATC Quad Trip
136B3122AAG001/ATC Trip Reference
136B3122AAG003/ATC Trip Reference
136B3230AAG001/ATC Second Level Multiplexer
158B7132TAG001/ATC Input Monitor
193B1187AAP001/ATC Detector Selector
193B1188AAG001/ATC Serial Receiver
193B1189AAG001/ATC Receiver Logic
193B1202AAG001/ATC Null Sequence Card