ML20125E053
| ML20125E053 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/31/1992 |
| From: | OMAHA PUBLIC POWER DISTRICT |
| To: | |
| Shared Package | |
| ML20125E049 | List: |
| References | |
| NUDOCS 9212160164 | |
| Download: ML20125E053 (2) | |
Text
.__
Q O. S. ' Nuclear Regulatory Conrnission LIC-92-339 ENCLOSURE 2 Corrected Pace for October 1992 MOR ifC-92-331) 9212160164 921214 PDR ADOCK 05000285 R
ENCLOSURE 1 1
OMAHA PUBLIC POWER DISTRICT Fort Calhoun Station Unit No. I j
October 1992 Monthly Operating Report i
i 1.
OPERATIONS
SUMMARY
j i
During October, Fort Calhoun Station (FCS)2 the Army Corps of Engineersoperated nominal 100% >ower level. On October 15,199 began river
" low reductions for the winter season.
B the end of the i
j month, the Missouri River level was ap)roximately 986' y" 6.
To allow for s
intake grid cleaning, FCS removed the curculating water pumps from service i
one at a time.
Several times during the month the main turbine control l
valves exhibited slight drift (both open and, closed).
The drift was generally limited to about 1% valve position.
This corresponds to about i
a 0.2"F change in cold leg temperature, and two (2) to three (
MWt (a variation of 0.133 to 0.2 percent reactor power). Troubleshoot 1 find a l by the Instrument and Control Technicians recorded various. voltages-t cause for the drift.
At the end of October.the results had been i
inconclusive with no identified cause. Troublesfiootingcontinuedatthe j
end of the month, the "A" channel of nuclear instrumentation was i
On October 25, 1992,due declared inoperable to fluctuations in measurements.
Per the 4
Technical Specifications,iate trip units of the Reactor-Protective System FCS entered Limiting Condition of Operation 1
(LCO) 2.15 (1)in bypass within one hour.
and appropr were placed Instrumentation and Control a'
Technicians conducted troubleshooting and adjusted voltage to the channel, i
with limited success.
CablinE "outside containment for the "A" safety I
channel was switched with the A control channel. This resulted in the
{
problem being exhibited on the "A" control channel drawer in the control
]
room.
A containment entry was made to trace the problem on the 4
containment side.
Technicians repaired a bad connection found in l
containment but.this cid not correct the fluctuation problem.
Subsequently,l wit'i thea temporary " modification was installed to exchange the "A"
safety channe A. control channel, and also to exchange the "D" i
safety channel witn the "B" control channel to maintain a symmetric excore monitorina configaration.
FCS personnel completed the change first with the "A" cfiannel followed by the "D" channel.
Both safety channels were I
declared operab e October 31, 1992, and the LC0 was exited.
While the final analyses are being completed concerning the Shape Annealing Factor and the effect.s of Rod Shadowing, 0perations placed restrictions on rod motion.
The folicwing NRC inspections were completed during October 1992:
4 IER No.
Title 92-20 Emerge cy Exercise Inspection 92-22 Month 1 Resident Inspection 92-25 Check-alve Program Inspection 92-27 Maintenance Program Inspection j
92-28 Security Systems inspection k--
J
,--,a..-
-. u...
, ;- a,...-, c.
~. - -,. _. -., _,,,
, _. -. _.. - - - -, -. -. _