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To: kfdkfd who wrote (29270)3/5/1999 6:37:00 PM
From: Hawkmoon  Read Replies (1) of 31646
 
euy2k.com

Pa. Nuclear Plant Loses Monitoring System
Computers During Y2k Testing

Rockville, Md. (February 26) - PECO Energy's Peach Bottom Unit 2 nuclear facility near York, Pa. recently experienced a 7 hour lockup of the plant's primary and backup plant monitoring system computers during Y2k testing. The NRC weekly summary of 2/12/1999 reports that operators lost the plant's Safety Parameter Display System (SPDS), Emergency Response Data System (ERDS), and 3D Monicore thermal limit monitoring system during the event.

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. PECO Energy plans to perform a full root cause analysis of this event
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