ENS 49205
ENS Event | |
|---|---|
04:00 Jul 16, 2013 | |
| Title | Part 21 Firmware Notice for Users of Yokogawa Dx1000N and Dx2000 Model Recorders |
| Event Description | This letter is to inform you of a potential Yokogawa data recorder lock-up condition that under specific circumstances may occur on Yokogawa DX Advanced DX1000N and DX2000 models equipped with firmware versions 3.01 through 4.14. These recorders were bought commercially from Yokogawa by National Technical Systems (NTS) and dedicated as basic components for nuclear safety related service.
The lock-up condition only impacts recorders when utilizing a 'custom trend display' option. There is no lock-up concern with these models when standard display screens are in use or on models using firmware versions earlier than R3.01. While NTS has not received any notification this lock-up condition occurred on a safety related recorder, please see the below description of the error and the appropriate corrective measures. Background: Public Service Electric and Gas - Hope Creek NPP notified NTS and Yokogawa of a lock up condition which occurred on a newly installed non-safety data recorder in their simulator. Yokogawa studied the condition and notified NTS on June 14, 2013 that a firmware error occurs during a specific set of operating conditions and sequence of events and was identified as the root cause of the recorder lock up condition. While these conditions are highly unlikely in an operating plant because under normal practice the internal memory on the recorder would not be cleared, the recorder will lock-up if the below setup conditions occur simultaneously: 1. A 'Custom Display' that uses a trend screen is active and visible. 2. There is no trend data stored in memory (blank trend screen); this is the condition following a 'Clear 3' initialize. 3. A 'Second Speed' function is invoked via remote input activation (requires / R1 option) or front panel key activation. This is called 'Trend rate switching' a function enabled in Basic Setting Mode that allows the trend update time/division to switch between two separate speeds. Corrective Action: This error only affects recorders if 'Custom Display' is being utilized. If this feature is not being used, no immediate action needs to be taken. If custom screens exist, then please utilize the recommendations below and update firmware when the new version (4.19) becomes available in August 2013. A short-term countermeasure is to follow the Yokogawa operational procedure of starting to record data immediately after invoking a 'Clear 3' initialize, and then waiting for at least one trend update to occur (Display data save) before invoking a 'Second Speed' change action. Should a lock-up condition occur, as indicated by a freeze of the display clock, the recorder simply needs to be powered off and re-started. The recorder will continue to function properly. Based on the above, the nuclear utilities need to be notified concerning this deviation so an evaluation may be performed to determine if this constitutes a defect that could create a substantial safety hazard. NTS cannot make this determination as only the effected utilities know the way the recorders are configured and utilized. The attached list contains the nuclear power plants which have been provided DX Advanced safety related Yokogawa recorders with firmware versions 3.01 and above by NTS. NTS has notified these utilities of the above condition via e-mail on July 16, 2013. CENG - Nine Mile Dominion - Surry Station Dominion - North Anna Entergy - Arkansas Nuclear One Entergy - Fitzpatrick Entergy - Pilgrim Nuclear Station Entergy - River Bend Exelon - Braidwood Warehouse Exelon - Byron Exelon - Dresden Station Exelon - Limerick Generating Station Exelon - Quad Cities First Energy - Perry Plant Florida Power & Light - St. Lucie Georgia Power - Vogtle Plant AEP - DC Cook Nebraska Public Power - Cooper NextEra Energy - Duane Arnold Omaha PPD - Fort Calhoun Entergy - Palisades Progress Energy - H.B. Robinson Plant PSE&G - Salem/Hope Creek Edison - San Onofre STP Nuclear Operating Company TVA - Sequoyah Station Wolf Creek Nuclear Operating Corp. Xcel Energy - Prairie Island Nuclear |
| Where | |
|---|---|
| Yokogawa Action, Massachusetts (NRC Region 1) | |
| Organization: | National Technical Systems |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+81.68 h3.403 days <br />0.486 weeks <br />0.112 months <br />) | |
| Opened: | Steven Eisenberg 13:41 Jul 19, 2013 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Jul 19, 2013 |
| 49205 - NRC Website | |
Yokogawa with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 492052013-07-16T04:00:00016 July 2013 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Firmware Notice for Users of Yokogawa Dx1000N and Dx2000 Model Recorders 2013-07-16T04:00:00 | |