And now:Ish <[EMAIL PROTECTED]> writes: From: [EMAIL PROTECTED] Region I Peach Bottom Unit 2: Loss of Plant Monitoring System Computers During Y2K Testing On February 8, 1999, while performing testing for a Y2K remediation modification to the Unit 2 rod worth minimizer (RWM) system, operators experienced a lock-up of both the primary and backup plant monitoring system (PMS) computers. As a result, operators also lost the following PMS-supported systems for about seven hours: safety parameter display system (SPDS), emergency response data system (ERDS), and 3D Monicore thermal limit monitoring system. Engineers had taken the backup PMS computer off-line and had advanced the PMS clock to a year 2000 Date. This led to a lockup of the backup PMS, and the system transferred to the primary, on-line PMS computer. The engineers did not recognize that the system had transferred and, believing that the original command was not accepted, again advanced the system clock, causing the primary PMS to lock up also. Several initial attempts to restore the PMS computers were unsuccessful, and operators determined that this constituted a major loss of emergency assessment capability. The PMS computers are not Y2K compliant, but the engineers believed that this would not impact the testing. Operators did not expect the testing would affect the on-line PMS computer. However, before the testing began, operators took contingency actions to lower Unit 2 power slightly to ensure shift average power levels were not exceeded. The licensee plans to perform a full root cause analysis of this event. http://www.nrc.gov/NRC/NEWS/WIR/week3.html look under region 1 ------------------------------------------------------------------------ Ta Da! Come see our new web site! http://www.onelist.com Onelist: A free email community service ------------------------------------------------------------------------ DOEWatch List --- Subscribe online: http://www.onelist.com/subscribe.cgi/doewatch Quote from Truman's diary July 25, 1945: "We have discovered the most terrible bomb in the history of the world. It may be the fire destruction prophesized in the Euphrates Valley Era, after Noah and his fabulous Ark. Anyway we think we have found the way to cause the disintegration of the atom." "The Doctor of the future will give No Medicine, but will interest his patients in the care of the human frame, in diet, and in the cause and prevention of disease." -Attributed to Thomas Alva Edison &&&&&&&&&&&&&&&&&&&&&&&&&& Tsonkwadiyonrat (We are ONE Spirit) Unenh onhwa' Awayaton http://www.tdi.net/ishgooda/ &&&&&&&&&&&&&&&&&&&&&&&&&&
