ML050210196

December 2004 Monthly Operating Report for University of Missouri Research Reactor Facility

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 Park Research Reactor Center Columbia, MO 65211 University of Mlissouri-Columbia 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 I Dec l1 University of Missour Research Reactor Center (MURR)

HOURS OPERATED THIS PERIOD 1 684.38 TOTAL HOURS OPERATED, REACTOR .1 263,216.22 HOURS OPERATED AT FULL POWER, THIS PERIOD L 682.70 -

TOTAL HOURS AT FULL POWER, REACTOR l 259,873.00. l INTEGRATED POWER THIS PERIOD 1 284.56 l MWD TOTAL INTEGRATED POWER, REACTOR l 102,481.69 l MWD

.- - . Submitted by:

MWD Custodian/Reactor Physicist I t3 10 Date: