Headquarters Daily report SEPTEMBER 30, 1994 *************************************************************************** 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 SEPTEMBER 30, 1994 Licensee/Facility: Notification: Board Of Municipal Utilities MR Number: 3-94-0175 N/A Date: 09/29/94 Sikeston,Missouri phone call from licensee Dockets: 03017394 License No: 24-18952-01 Subject: failure of nuclear gauge's support system Reportable Event Number: N/A Discussion: On September 29, 1994, the licensee reported that a Kay Ray gauge Model 7062P containing a nominal 50 millicuries (1850 MBq) of cesium-137 was discovered by workers who were cleaning up a limestone spill under a limestone hopper. The gauge had fallen approximately 15 to 20 feet from its installed position and was approximately 15 to 20 feet from the hopper. The RSO reported no visible damage to the gauge, but the gauge's shutter was half open. The RSO closed and locked the shutter and secured the gauge in a locked area of the plant. The licensee will wipe test the gauge for contamination and report the results to Region 3. The RSO is in the process of: (1) determining when the gauge fell and why the support system failed to keep the gauge in it's installed position; (2) determining if any of the workers came in contact with the fallen gauge; and (3) verifying that all of the other nuclear gauges are accounted for and in their original positions. Regional Action: Region 3 will monitor the licensee's response to this incident. Contact: w.p. reichhold (708)829-9839 j.a. grobe (708)829-9837 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION IV SEPTEMBER 30, 1994 Licensee/Facility: Notification: Texas Utilities Electric Co. MR Number: 4-94-0114 Comanche Peak 2 Date: 09/30/94 Glen Rose,Texas Senior Resident Inspector Dockets: 50-446 PWR/W-4-LP Subject: MAIN FEED PUMP BEARING FAILURE Reportable Event Number: N/A Discussion: On September 28, Unit 2 control room operators received a high temperature alarm on the Main Feed Pump 2B inboard radial bearing and observed that the bearing temperature rose from 218 degrees F to 300 degrees F in less than 1 minute. An auxiliary operator observed that the bearing casing was glowing red and light wisps of smoke were observed coming from the casing. Control Room operators manually tripped the main feed pump, which caused an expected turbine runback to 60 percent reactor power. Prior to this event, all main feed pump parameters were normal. The bearing temperature trend indicated that bearing temperature rose from its normal operating temperature of 135 degrees F to greater than 350 degrees F in less than 5 minutes. A visual inspection of the pump bearing revealed that the bearing had been wiped and significant scoring had occurred on the pump shaft. The licensee plans on replacing the pump's rotating element, performing an inspection of the pump, and draining, cleaning, and refilling the lubricating oil sump. Repairs are scheduled to be completed on October 3. The licensee is investigating the cause of the failed bearing. The licensee is currently maintaining power below 50 percent in accordance with Technical Specifications because of zenon oscillations which affect axial flux difference. Regional Action: The resident inspectors are monitoring licensee actions. Contact: D. D. Chamberlain (817)860-8249