ML031700481
| ML031700481 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 06/11/2003 |
| From: | Foyto L Univ of Missouri - Columbia |
| To: | Alexander Adams Office of Nuclear Reactor Regulation |
| References | |
| Download: ML031700481 (6) | |
Text
Research Reactor Center University of Missouri-Columbia Research Park Columbia, MO 65211 PHONE (573) 8824211 FAX (573) 882-6360 June 11, 2003 5
o Mr. Alexander Adams, Jr.
U.S. Nuclear Regulatoxy Commission Mail Stop 012-G13 Washington, DC 20555-0001
SUBJECT:
Monthly Operations Summary Enclosed is a copy of MU
's Monthly Operations Summary for May 2003. If you have any questions, please contact me at (573) 882-5276.
Sincerely, Leslie Foyto Interim Reactor Manager LM/lmcg cc. Craig Bassett Enclosure AN EQUAL oPPo1N1IADA INSTIImON w
U VEfTR lj Of.1vLSSO'UR RESEARC Ef sACOR OPERAtIO!S MONIfL3&y S1LARY ZMay, 2003 TPreparedfy:
Oyerations Staff
INTRODUCTION The reactor operated continuously in May with the following exceptions: 3 shutdowns for scheduled maintenance and refueling; 2 unscheduled shutdowns. One Licensee Event Report, No. 03-01, was submitted within the Technical Specification required thirty-day time requirement.
MAINTENANCE ACTIVITIES 5/5/03 Refueled - removed core 03-19, loaded core 03-20.
5/8/03 Installed new Drain Tile Sump Pump with associated valves and piping.
5/12/03 Refueled - removed core 03-20, loaded core 03-21.
5/17/03 Refueled - removed core 03-21, loaded core 03-22.
Replaced P501A (primary system pump) coupling flex element and DCW (domestic cold water) cooling lines.
5/19/03 Refueled - removed core 03-22, loaded core 03-23.
5/21/03 Completed CP-26, Containment Building Compliance Test.
Refueled - removed core 03-23, loaded core 03-24.
5/26/03
IJNSCHEDULED S=DONNNS Date No.
TyRe Cause 5/17/03 1161 Scram P501A flexible coupling failure.
On May 17, a Reactor Scram was automatically initiated when the flexible coupling on primary coolant system pump P501A failed resulting in a reduction in primary coolant system flow. The pump and motor were inspected and it was determined the failure was due to a defective coupling. The coupling was replaced and P501A was tested satisfactorily. Damaged DCW cooling lines were also replaced and leak checked. The reactor was subsequently refueled and returned to operation.
Date No.
Tae Cause 5/18/03 1162 Scram TE-980A indication failed downscale.
On May 18, a Manual Reactor Scram was initiated when the duty Operator discovered that Primary Coolant Heat Exchanger 503A Temperature Instrument, TE-980A, indication had failed downscale. The RTD/transmitter unit for 980A was replaced and CP-8B was performed to verify operability and calibration. The reactor was subsequently refueled and returned to operation after the regularly scheduled maintenance day. Licensee Event Report No. 03-01, providing a description of this event and the corrective actions taken, was submitted within the Technical Specification required thirty-day time requirement.
LICENSEE EVENT REPORT Date No.
5/18/03 03-01 On May 18, a deviation from Technical Specification 3.3.a occurred when Primary Coolant Heat Exchanger 503A Temperature Instrument TE-980A indication failed downscale resulting in less than the required number (N) of instrument channels in the reactor safety system. The Technical Specifications require two (2) Reactor Inlet Temperature instruments for operation. The reactor was immediately shutdown by Manual Scram. Troubleshooting and testing failed to yield the direct cause of the downscale failure and the malfunction could not be reproduced. This failure is similar to a failure from January 26, 2002 of TE-980B (MURR LER No. 02-01). The RTD/transmitter unit was replaced and CP-8B was successfully performed to demonstrate operability of the instrument. The reactor was subsequently refueled and retumed to operation after a regularly scheduled maintenance day. Rosemount, Inc. has been contacted regarding the apparent repeat failure of the RTD/Transmitter unit. We are currently awaiting a failure analysis report and, if needed, any additional corrective action guidance.
May 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:
Date:
I May-03 I
l 676.12 l
250,627.08 674.18 1 247,340.96 j
l 281.00 1 MWD l
97,257.57 MWD D
k MWD Custodian/Reactor Physicist 6/2 03 I
1.