ML050210196
| ML050210196 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 01/07/2005 |
| From: | Foyto L Univ of Missouri - Columbia |
| To: | Alexander Adams Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML050210196 (5) | |
Text
Research Reactor Center University of Mlissouri-Columbia Research Park Columbia, MO 65211 PioNE (573) 882421 1 FAX (573) 882-6360 January 7, 2005 Mr. Alexander Adams, Jr.
U.S. Nuclear Regulatory Commission Mail Stop 012-G13 Washington, DC 20555-0001
SUBJECT:
University of Missouri Research Reactor Facility Docket No. 50-186 Monthly Operations Summary
Dear Mr. Adams:
Enclosed is a copy of MURR's Monthly Operations Summary for December 2004. If you have any questions, please contact me at (573) 882-5276.
Sincerely, S4f2 Leslie P. Foyto Reactor Manager LPF/djr Enclosure A:::
- k AN EQUAL OPPORTNTrY/ADA ImSrrvmo.lN
UNIVERSITY OF MISSOURI RESEARCH REACTOR-OPERATIONS MONTHLY
SUMMARY
December 2004 Prepared by:
Operations Staff
INTRODUCTION The reactor operated continuously in December with the following exceptions: four shutdowns for scheduled maintenance and refueling; one unscheduled shutdown.
MAINTENANCE ACTIVITIES 12/6/04 Refueled - removed core 04-56, loaded core 04-57.
Replaced the Primary Coolant Demineralization System inlet filters.
12/13/04 Refueled - removed core 04-57, loaded core 04-58.
Replaced the Pool Coolant Skimmer System filters.
Replaced the jog/stop switch for Secondary Coolant System pump P-i.
Realigned the motor and pulley on the Emergency Air Compressor.
12/20/04 Refueled - removed core 04-58, loaded core 04-59.
12/21/04 Replaced the blower starter contactor for the NMC Model RAK Stack Monitor.
12/27/04 Refueled - removed core 04-59, loaded core 04-60.
Completed Modification Record 75-16, Add. 2; Relocation of the Reactor Safety System Monitoring Circuit ("White Rat") Panel.
Replaced the control circuit fuse for Cooling Tower Fan CF-3.
Page 2 of 3
UNSCIHEDULED SHUTDOWNS Date No.
Type Cause 12-20-04 1175 Rod Run In Nuclear Instrument Channel 6 High Power.
Rod Run In On December 20, 2004, a Nuclear Instrumentation (NI) Channel 6 High Power Rod Run-In occurred during a reactor startup. The operator had attempted to place the reactor in automatic control at 10 MW with Channel 6 indication too close to the high power rod run-in set point of 114%. The Wide Range channel, the NI channel that provides the output signal for automatic reactor control, was indicating approximately 15% lower than Channel 6 indication. The reactor was shutdown and checks of Channel 6 were performed to verify proper operability. Actual power, as recorded by the remaining NIs and displayed by the real-time power calculator, was less than 10 MW at time of the rod run-in. The reactor was subsequently returned to 10 MW operation. The operators involved were coached on the importance of being conservative on the approach to 10 MW and placing the reactor in automatic control during this sensitive transient period.
Page 3 of 3
Dec 0 -
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 I
Dec l1 1
684.38
.1 263,216.22 L
682.70 l
259,873.00.
l 1
284.56 l MWD l
102,481.69 l MWD Submitted by:
MWD Custodian/Reactor Physicist I t 3 10 Date: