YOKOGAWA: PART 21 FIRMWARE NOTICE FOR USERS OF YOKOGAWA DX1000N AND DX2000 MODEL RECORDERS

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 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"
[link to www.nucpros.com]
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