ML20154M365

Monthly Operating Rept for June 1998 for Univ of Missouri Research Reactor

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)

Text

<

4

.).E10RITY ROUTING first I $$mi

~

5 l ..f@ -

o ,r.q 3 .,

- j. .j .- - - , . . . . ._,

f( *1,#

~ * ~ ~ *

.~.

g ,,

[ th7.?h !4. ---- .;L ... . "_ '.__

l FIL'd W%2~~

UNIVERSITY OF MISSOURI RESEARCH REACTOR OPERATIONS MONTHLY

SUMMARY

(( ~ h 1

/

\

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-1 Metries detector and cabling. These were replaced and tested satisfactorily and no further problems I 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 4

transmitter 929; removing the scram and rod run in safety system trip functions from the (original

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 4

TOTAL HOURS AT FULL POWER 209,502 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.