ENS 41599
ENS Event | |
|---|---|
06:00 Apr 7, 2005 | |
| Title | Part 21 Notification - Thermo Electron Data Acquisition Recorders |
| Event Description | The following information was provided by the manufacturer via facsimile:
On April 7, 2005, Thermo Electron engineers determined that the potential exists that the nuclear safety-related series of paperless data acquisition recorders (SV10C, SV18C and SV28C series recorders) may exhibit failure to start up due to a deficiency in a power supply module. Cycling of power to the recorder may be required to ensure the boot up sequence of the recorder. The power supply module is a commercial grade dedicated item. Thermo Electron has determined that the cause of the anomaly is the rise time variation of the installed commercial power supply module. The module is a generic switching power supply used in a multitude of commercial applications. This module is mounted on a power supply carrier printed circuit assembly (PCA). This anomaly only occurs when a recorder has been turned off and then restarted. Should the recorder fail to boot up, the anomaly can be corrected by cycling power to the recorder until the recorder re-boots. This startup failure may occur on recorder units where the power supply carrier PCA contains a power supply module that does not have a Made in the USA mark. Recorder units that utilize a power supply carrier PCA containing a power supply module labeled with Made in USA do not exhibit the anomaly and are not the subject of this notification. There have been no failures reported in any nuclear safety-related applications of SV10C, SV18C or SV28C recorders. Should the failure occur, it is detectable and will not cause the recorder to present or record any erroneous data. Thermo Electron engineers have redesigned the power supply carrier PCA to accommodate a wider variation in rise times associated with the power supply modules manufactured in the US, China or India as described above. Affected PCA part numbers are CB100492, CB100505, CB100511 and CB100531 which have a power supply module that does not have a Made in USA mark. While there have been no failures reported of recorders in nuclear safety-related applications, as a precaution, Thermo Electron is recommending the replacement of any affected PCA as previously noted with a redesigned PCA for recorders which are used as the primary instrument for recording or reporting critical data and/or functions; are not backed up by a UPS system; and contain the affected PCA. Nuclear utilities that have purchased nuclear safety-related SV10C, SV18C or SV28C recorders potentially affected by this notification (listed individually by Part/Serial Number in the notification): Tennessee Valley Authority - Watts Bar Nuclear Plant First Energy Corporation - Beaver Valley Power Station Duke Energy Corporation - McGuire Site Tennessee Valley Authority - Browns Ferry Nuclear Plant Entergy Operations - River Bend Progress Energy CP&L - Brunswick Nuclear Plant |
| Where | |
|---|---|
| Thermo Electron Corporation Houston, Texas (NRC Region 4) | |
| Organization: | Thermo Electron Corporation |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+179.4 h7.475 days <br />1.068 weeks <br />0.246 months <br />) | |
| Opened: | Barry Nicholson 17:24 Apr 14, 2005 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Apr 14, 2005 |
| 41599 - NRC Website | |
Thermo Electron Corporation with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 415992005-04-07T06:00:0007 April 2005 06:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Notification - Thermo Electron Data Acquisition Recorders ENS 406092004-03-24T06:00:00024 March 2004 06:00:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Thermo Westronics Model 3000C and 3200C Series Chart Recorder Failures 2005-04-07T06:00:00 | |