The following information was summarized from the report obtained from the vendor via facsimile:
Technology for Energy Corporation [TEC] has determined that the Model 1414 Valve Flow Monitoring Systems power supply may not provide proper output voltage contrary to power supply status indicators on the rack. This may result in the power supply not providing necessary power to its associated input sensor. A subsequent loss of the sensor output would result in the inability of the system to indicate any valve flow. Depending on the specific configuration, signals from more than one sensor could be lost on a single failure.
This Model 1414 system design dates back to 1979. TEC has not been made aware of any instances of the described failure mode in the 35 year history of the product design, suggesting that the robustness of power supply design and the users periodic maintenance of the system has provided for acceptable continued operation.
The potentially affected plants include Clinton Unit 1; Comanche Peak Units 1 & 2; Nine Mile Point Unit 2; Palo Verde Units 1, 2, & 3; River Bend Unit 1; Susquehanna Units 1 & 2; Watts Bar Units 1 & 2.
- * * UPDATED FROM DONNA MULLALY TO DONALD NORWOOD AT 1329 EST ON 11/24/2014 * * *
After submitting the original Part 21 notification, TEC discovered that Columbia Generating Station had been omitted from the list of affected plants.
The following correction should be applied: The potentially affected plants include Clinton Unit 1; Columbia Generating Station, Comanche Peak Units 1 & 2; Nine Mile Point Unit 2; Palo Verde Units 1, 2, & 3; River Bend Unit 1; Susquehanna Units 1 & 2; and Watts Bar Units 1 & 2.
Notified R4DO (Campbell). Notified via E-mail R1DO (Noggle), R2DO (Ehrhardt), R3DO (Duncan) and Part 21 Group.
- * * UPDATE FROM DONNA MULLALY TO JOHN SHOEMAKER AT 0820 EST ON 01/06/2015 * * *
The following information was received via fax on 12/19/2014:
TEC considers this event closed.
Notified R1DO (Jackson), R2DO (Hopper), R3DO (Kunowski), R4DO (Pick), and Part 21 Group via email.