ML20202H393

Monthly Operating Rept for Nov 1997 for Univ of Mo Research Reactor

ML20202H393
Person / Time
Site:	University of Missouri-Columbia
Issue date:	11/30/1997
From:	MISSOURI, UNIV. OF, COLUMBIA, MO
To:
References
NUDOCS 9802200376
Download: ML20202H393 (2)

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November 1997 The reactor cperated continuously in November with the following exceptions: five shutdowns for scheduled maintenance, refueling or sample changes; two unscheduled shutdowns. On November 4, the shift supervisor initiated a manual scram when he noted that tie control rod position indication for blade 'C" did not change in response to a routine shimming. It was subsequently discovered that the chain which drives the encoder / position indicator assembly had come offits sprocket. Further inspection indicated damage to the encoder. A spare encoder and chain were installed and the assembly was returned to normal optration. On November 11, a scram occurred due to an interruption in facility electrical power. The power outage lasted for about 10 minutes. Upon restoration of site electrical power, a hot startup was completed. Major maintenance items for the month included: replacing the encoder and drive chain on the rod position indicator for control blade "C"; replacing the (trailing) solenoid on the south containment ventilation back-up door; replacing bearings and seals on pool pump 50SB; replacing contrcl blade "C" photo cell sensor. UNSCIIEDULED SIIUTDOWNS Date F.th Tyne Cause 11/04/97 1069 Manual Scram Loss of blade "C" position indication 11/11/97 1070 Scram Site electrical power interruption l OPEllATION SUMMAltY HOURS OPERATED tills PERIOD 652 TOTAL HOURS OPERATED 208,051 IIOURS AT FULL POWER tills PERIOD 647 TOTAL HOURS AT FULL POWER 204,970 INTEGRATED POWER THIS PERIOD 270 MWD TOTAL INTEGRATFD POWER 79,555 MWD MAINTENANCE ACTIVITIES 11/03/97 Refueled removed core 97-47, loaded core 97-48. 11/04/97 Refueled - removed core 97-48, loaded core 97-49. Replaced the encoder anJ drive chain on the rod position indicator for control blade "C" 11/10/97 Refueled - removed core 97-49, loaded core 97-50. Replaced trailing solenoid on the south containment ventilation bacbup door. 11/17/97 Refueled - removed core 97 50, loaded core 97 51. Replaced bearings and seals on pool pump 50SB. Performed biennial change-out of control blade o.Tset meel.anism "C" Replaced control blade "C" photo cell sensor. 11/23/97 Refueled - removed core 97-51, loaded core 97-52. y ,