ML051870349
| ML051870349 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 06/20/2005 |
| From: | Foyto L Univ of Missouri - Columbia |
| To: | Alexander Adams Office of Nuclear Reactor Regulation |
| References | |
| Download: ML051870349 (5) | |
Text
Research Reactor Center University of Missouri-Columbia Research Park Columbia, MO 65211 Piio,, (573) 882-4211 FAX (573) 882-6360 June 20, 2005 Mr. Alexander Adams, Jr.
U.S. Nuclear Regulatory Commission Mail Stop 0 12-G 13 Washington, DC 20555-0001
REFERENCE:
SUBJECT:
Docket No. 50-186 University of Missouri-Columbia Research Reactor Amended Facility License R-103 MURR Operations Monthly Summary
Dear Mr. Adams:
Enclosed is a copy of MURR's Monthly Operations Summary for May 2005. If you have any questions, please contact me at (573) 882-5276.
Sincerely, Leslie P. Foyto Reactor Manager LPF/djr Enclosure 1___\\ _1_% 0
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UNIVERSITY OF MISSOURI RESEARCH REACTOR OPERATIONS MONTHLY
SUMMARY
May 2005 Prepared by:
Operations Staff
INTRODUCTION The reactor operated continuously in May with the following exceptions: 5 shutdowns for scheduled maintenance and refueling; 2 unscheduled shutdowns.
MAINTENANCE ACTIVITIES 5/2/05 Refueled - removed core 05-21, loaded core 05-22.
5/4/05 Replaced the Secondary Coolant System pH probe.
5/9/05 Refueled - removed core 05-22, loaded core 05-23.
5/16/05 Refueled - removed core 05-23, loaded core 05-24.
Replaced the Nuclear Instrumentation Signal Processor Drawer No. 2.
5/19/05 Refueled - removed core 05-24, loaded core 05-25.
5/23/05 Refueled - removed core 05-25, loaded core 05-26.
Replaced the Uninterruptible Power Supply batteries.
Page 2 of 3
UNSCHEDULED SHUTDOWNS Date No.
T)pe Cause 5/9/05 1181 RRI Rod Not in Contact with Magnet Rod Run-In On May 9, a Rod Not In Contact with Magnet Rod Run-In occurred while conducting a normal reactor startup. Control blade 'A' separated from its magnet while performing a shimming evolution. Initial troubleshooting efforts revealed no abnormalities. Compliance Procedure No.
10 was performed, which verified satisfactory alignment for the control blade's full travel (26-inches), and the reactor was eventually restarted to 10 MW operation. During the following scheduled maintenance day it was discovered that the allen head screw, which attaches the magnet to the drive tube, was installed backwards. The drive tube is a hollow aluminum tube that is tapped on one side and has a non-threaded hole on the other side. The screw was attached to the drive tube first through the threaded side, which allowed more "slop" between the magnet and drive tube. Additionally, the magnet cabling was pulled too tight through its securing clamp, thus not allowing sufficient freedom for the magnet to hang. Both of these conditions caused the magnet to tilt approximately 20 degrees off vertical centerline. With the magnet not hanging freely and vertically, it had a tendency to push the anvil to one side as it engaged, thus causing the anvil to drag against the housing and the magnet to pull off The remaining control blade magnets were also checked to ensure that they hung freely and vertically.
Date No.
Type Cause 5/18/05 1182 Scram Loss of Remote Rod Position Indication On May 18, the control Rod Position Indication (RPI) system remote Operator Display Assembly (ODA) display screen on the control console failed (went blank). The master local display chassis on the Instrument Panel remained operational; therefore RPI was still available to the operators. After conferring with the Reactor Manager, the Lead Senior Reactor Operator shutdown the reactor to troubleshoot the ODA. The Chief Electronic Technician determined that the ODA display control card had failed. The spare display control card was installed which returned the ODA to operation. The reactor was subsequently returned to 10 MW operation.
Page 3 of 3
OPERATION
SUMMARY
FOR MONTH OF University of Missour Research Reactor Center (MURR)
HOURS OPERATED THIS PERIOD TOTAL HOURS OPERATED, REACTOR HOURS OPERATED AT FULL POWER, THIS PERIOD TOTAL HOURS AT FULL POWER, REACTOR INTEGRATED POWER THIS PERIOD TOTAL INTEGRATED POWER. REACTOR Submitted by:
I)D z kc I
May-05 I
1 676.67 l
266,392.01 j
1 673.75 1 263,032.19 1 l
280.87 l MWD l
103,798.60 l MWD MWD Custodian/Reactor Physicist 6 (6 /o Date: