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Headquarters Daily Report MAY 01, 2000 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS X REGION I X REGION II X REGION III X REGION IV X PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION III MAY 1, 2000 Licensee/Facility: Notification: Northern States Power Co. MR Number: 3-00-0022 Prairie Island 2 Date: 05/01/00 Welch,Minnesota Dockets: 50-306 PWR/W-2-LP Subject: Unit 2 Refueling Outage Discussion: Prairie Island Unit 2 began a refueling outage on April 28, 2000. Major activities for the outage include steam generator eddy current inspections, steam generator row 1 and 2 tube u-bend heat treatment, a full-core fuel offload to support fuel assembly top nozzle inspections, and a D5 emergency diesel generator overhaul. During the power descension prior to the start of the outage, the reactor tripped at 21.6% power. The cause of the trip was a trip of the main turbine, apparently caused by a high water level signal from one of the feedwater heaters. A similar trip also occurred during the most recent shutdown of Unit 2 for a refueling outage in November 1998. Regional Action: The resident inspectors observed portions of the reactor coolant system cooldown and will review selected operations and maintenance activities during the outage. The final licensee evaluation of the reactor trip will also be reviewed. Contact: Roger Lanksbury (630)829-9631 _