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Morning Report for February 14, 2000
Headquarters Daily Report FEBRUARY 14, 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 FEB. 14, 2000 Licensee/Facility: Notification: Firstenergy Nuclear Operating Co. MR Number: 3-00-0009 Perry 1 Date: 02/14/00 Perry,Ohio Dockets: 50-440 BWR/GE-6 Subject: PERRY OPERATORS IDENTIFY AND SUPPRESS SECOND MINOR FUEL DEFECT Discussion: On January 31, 2000, plant operators identified a slight increase in an offgas system post-treatment radiation monitor strip chart recorder. Subsequent chemistry analyses and discussion with General Electric indicated that a small fuel defect was the most likely cause for the increase in the radiation monitor value. The radioactive material detected in the offgas system was less than 1 percent of that allowed by the Perry Technical Specifications. The licensee commenced testing to identify the location of the fuel defect on February 11, 2000. On February 14, 2000, the minor defect location was identified and the flux in the area of the defect was suppressed by inserting a control rod. A previous defect had been identified and suppressed on January 16, 2000, as discussed in Morning Report Numbers 3-00- 0001 and 3-00-0002. Regional Action: Resident Inspectors are following this issue. Contact: CHRISTINE LIPA (440)259-3610 DARELL ROBERTS (630)829-9705 _ REGION IV MORNING REPORT PAGE 2 FEBRUARY 14, 2000 Licensee/Facility: Notification: Union Electric Co. MR Number: 4-00-0009 Callaway 1 Date: 02/14/00 Fulton,Missouri Telephone from Resident Inspector Dockets: 50-483 PWR/W-4-LP Subject: AUTOMATIC REACTOR TRIP ON LOSS OF REACTOR COOLANT SYSTEM FLOW Reportable Event Number: 36685 Discussion: On February 13, 2000, at approximately 7:34 a.m., the reactor at Callaway Plant, located near Fulton, Missouri, tripped due to low reactor coolant system flow. For the 12 minutes immediately prior to the reactor trip, the site had experienced fluctuations in offsite voltage. These fluctuations caused reactor coolant Pump B to trip on a current phase imbalance and resulted in the reactor tripping on low reactor coolant system flow. Immediately following the reactor tirp, the remaining three reactor coolant pumps also tripped on a current phase imbalance. Without forced reactor coolant flow, the reactor was cooled by natural circulation. The initiating cause of this event was a downed 161 kV power line in southeast Missouri, which was experiencing severe thunderstorms. Breakers designed to isolate the downed line did not open. This caused repeated high currents until a 345 kV/161 kV transformer, that provided the interface with the AMEREN UE electrical grid, failed. The affected power line, breakers, and transformer were owned and serviced by another (non-nuclear) utility. Following the trip, plant equipment responded properly. After determining the cause of the reactor trip and verifying that the AMEREN UE grid was fully isolated from the faulted grid in southeast Missouri, the licensee commenced a reactor startup. The reactor was taken critical at 9:10 p.m. on February 13. The main turbine was synchronized to the electric grid at 5:18 a.m. on February 14. The plant is currently at 23 percent power. Power is being increased at 3 percent per hour. Regional Action: The resident inspectors will continue to monitor licensee actions. Contact: Vince Gaddy (573)676-3181 Bill Johnson (817)860-8148 _
Page Last Reviewed/Updated Thursday, March 29, 2012
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