ML20154M365
| ML20154M365 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 06/30/1998 |
| From: | MISSOURI, UNIV. OF, COLUMBIA, MO |
| To: | |
| References | |
| NUDOCS 9810200247 | |
| Download: ML20154M365 (3) | |
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UNIVERSITY OF MISSOURI RESEARCH REACTOR OPERATIONS MONTHLY
SUMMARY
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JUNE 1998 Prepared by:
Operations Staff 9810200247 980630 PDR ADOCK 05000186 R
PDR AUG 0 41953
- e June 1998 The reactor operated continuously in June with the following exceptions
- nine r,hutdowns for scheduled maintenance, refueling and/or sample changes; two unscheduled shutdowns.
On June 15, a n anual scram was initiated when the operators noted sudden changes in the indications for Gamma-Metrics nuclear instrument channels #1 (source range), #2 (intermediate range), and #4 (power range).131ectronic.; technidans replaced a failed Gamma-Metrics wide range amplifier pre-amplifier. The nuclear instruments were tested satisfactorily and a normal reactor startup was commenced. While the reactor was at 5 MW in manual control, the operators again noted sudden changes in the Gamma Metrics nuclear instruments and immediately shutdown the l
reactor by manual scram. Electronics technicians eventually traced the problem to the Gamma-Metries detector and cabling. These were replaced and tested satisfactorily and no further problems 1
of this type have recurred.
J Major maintenance items for the month included: replacing the Gamma-Metrics fission l
chamber detector and cabling (twice); replacing the meter for core discharge (delta) pressure transmitter 929; removing the scram and rod run in safety system trip functions from the (original 4
1.
installation) Generaf Electric wide range monitor and installing them on the (recent installation)
Gamma-Metri;s power rango monitor--designated channel #4; replacing the Gamma Metrics wide range monitor amplifier pre-amplifier (twice); replacing the piston seals and rod seal on the actuator for poolisolation valve 509; shipping 16 spent fuel elements to the Department of Energy's Savannah River Site in South Carolina.
UNSCHEDULED SHUTDOWNS Date A
Tvne Cause 6/15/98 1084 Manual Screm Gamma-Metrics detector / cable /
pre-amplifier failure.
6/15/98 1085 Manual Scram Gamma Metrics detector / cable /
pre amplifier failure.
OPERATIONS
SUMMARY
i HOURS OPERATED THIS PERIOD 605 TOTAL HOURS OPERATED 212,605 HOURS AT FULL POWER THIS PERIOD 601 TOTAL HOURS AT FULL POWER 209,502 4
INTEGRATED POWERTHIS PERIOD 251 MWD TOTAL INTEGRATED POWER 81,445 MWD MAINTENANCE ACTIVITIES i
06/01/98 Refueled - removed core 98-27, loaded core 98 28. Replaced Gamma-Metrics fission chamber detector and cabling.
06/08/98 Refueled - removed core 98-28, loaded core 98-29.
06/15/98 Refueled - removed core 98-29, loaded core 98-30. Replaced delta pressure transmitter 929 meter. Moved the scram and rod run in safety system trip functions from the General Electric wide range monitor to the Gamma-Metrica power range monitor.
Replaced the Gamma-Metrics wide range amplifier pre-amplifier (twice).
06/16/98 Replaced the Gamma. Metrics fission chamber detector and cabling.
06/22/98 Refueled removed core 98-30, loaded core 98-31. Replaced the piston seals and rod seal on the actuator for pool discharge isolation valve 509.
06/23/98 Refueled - removed core 98-31, loaded core 98-32.
06/29/98. Refueled - removed core 98-32, loaded core 98 33.