ML19332B256

Revised Page 1 for Monthly Operating Rept for Mar 1980

ML19332B256
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/18/1980
From:	PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML19332B255	List: ML19332B254 ML19332B256 ML19332B257
References
NUDOCS 8009260372
Download: ML19332B256 (1)

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This report contains the highlights of the Fort St. Vrain, Unit No. I activi-ties, operated under the provisions of the Nuclear Regulatory Commission Oper-ating License, DPR-34 This report is for the month of March,1980.

1.0 NAPA\TIVE

SUMMARY

OF OPERATING EXPERIENCE AND MAJOR SAFETY RELATED MAINTEMANCE 1.1 Summary At the beginning of this period, preparations were made for plant startup. On March 5,1980, at 0250 hours0.00289 days <br />0.0694 hours <br />4.133598e-4 weeks <br />9.5125e-5 months <br />, the turbine generator was synchronized and the electric load increased to eighty mega-watts. On March 6,1980, the turbine generator actual overspeed tests were performed. The unit was resynchronized af ter the test, and the electrical load was increased to one hundred megawatts.

Excessive oxidant contaminants in the primary coolant helium, as well as various control system problems caused the electrical load capability to be somewhat variable over the next seversi days of operation.

1.2 Operations Early in the morning of March 11, 1980, the east side return water distribution header on the main cooling tower ruptured. Large amounts of circulating water spilled over the distribution box near the rup-ture onto the ground. The yard drainage system in this area did not have the capability to handle this quantity of water, resulting in the water level in the surrounding area to reach a depth of several inches. Some of this water entered the manhole containing cables and associated conduits for the circulating water pump system. This water damaged several electrical motors of the circulating system.

The main turbine generator was tripped and the reactor scra=ced when it was evident that condenser vacuum could not be maintained.

Repairs were made and the reactor was brought critical again on the same day, but because of the damage to the circulating water pu=ps and the loss of acceptable feedwater chemistry, reactor power could not be increased above two percent until March 15, 1980.

On March 16, 1980, the "nu=ber two" auxiliary boiler tripped of f the line f rom undetermined causes. During the atte=pt to start " number one" auxiliary boiler, some boiler tubes were damaged due to low water level in the drum which rendered " number one" boiler inoperable.

" Number two" boiler was repaired and restarted af ter this occurrence. I The turbine generator was synchronized on March 16,19S0, and load was grcdually increased to two hundred thirty megawatts on March 13 and remained at that level until March 21, 19S0.

i 8009260 37 R