Thursday, August 15, 2019

River Bend Isn't A World Class Nuclear Plant

Update

This is what a good plant looks like.
 
Comanche Peak 
PLANT STATUS
Unit 1 began this inspection period in coast down at 91 percent rated thermal power. The unit coasted down until April 20, 2019, when the unit was shut down to commence a refueling outage. On May 26, 2019, the unit began a reactor startup and reached rated thermal power on May 31, 2019. The unit remained at or near rated thermal power for the remainder of the inspection period.
 Unit 2 operated at or near rated thermal power for the entire inspection period. 

***There are on the cusp of a plant trip with the conditions of the employees and maintenance.  
River Bend Station began the inspection period shut down in Mode 5 for refueling outage RF-20.  The station performed a reactor startup on May 11, 2019, ending the outage.  The unit reached 87 percent power and remained there while waiting to perform a rod pattern adjustment.
On May 22, 2019, the operators reduced power to 36 percent due to an oil leak from a reactor recirculation pump transformer.  On May 24, 2019, the operators restored the reactor recirculation pump and resumed the reactor startup.  The unit reached 90 percent power and remained there while waiting to perform a rod pattern adjustment.
On May 28, 2019, the operators reduced power to 65 percent due to a feedwater heater leak.  The station commenced a normal reactor shut down on May 31, 2019, to repair the leak. 
On May 31, 2019, during the planned shutdown, the operators inserted a manual scram due to an unplanned loss of reactor feedwater.  The plant remained shut down following the scram to repair the feedwater heater leak. 
On June 6, 2019, the station performed a reactor startup.  On June 8, 2019, the unit reduced power from 76 percent to 36 percent due to another oil leak on the reactor recirculation pump transformer.  On June 11, 2019, the operators restored the reactor recirculation pump and resumed the reactor startup. 
On June 17, 2019, the unit reached 100 percent power.  Power remained at or near 100 percent for the remainder of the inspection period.
Semiannual Trend Review (IP Section 02.02) (1 Sample)
The inspectors reviewed the licensee’s corrective action program for potential adverse trends in the area of corrective maintenance that might be indicative of a more significant safety issue.  During the first half of the year, the inspectors observed an adverse trend in corrective maintenance.  The licensee performed maintenance on several safety--related or risk--significant components that subsequently failed, requiring rework.  The inspectors noted examples including a repeat failure of an intermediate range monitor, a repeat failure of a recirculation pump transformer, and inadequate maintenance of a recirculation pump motor bearing lubrication system.  These failures have been documented in the corrective action program.

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