Byron (USA)

Map of Byron

Map Loading...

2 * 1100 MW PWR units constructed by Westinghouse operating since 1985 and 1987

Facilities in Byron

plantreactor typconstruction startoperation startshut down
Byron-1PWR19751985
Byron-2PWR19751987
1995-11-20

ComEd has found about 2,000 indications of circumferential cracking in the tubes of Byron-1's four steam generators.
The utility plans to sleeve or plug all of the tubes with crack indications in the 1,175-MW Westinghouse PWR. The discovery has prompted the utility to propose one of the largest tube pulls to date - 10 tubes at an estimated cost of $ 3- to $ 4-million, including analysis. By the tube pulls, ComEd hopes to advance industry efforts to develop criteria acceptable to NRC which would justify leaving some circumferentially cracked tubes in service.
Two and one-half cycles remaining before scheduled steam generator replacements.

1991-11-07

Reactor trip and low SG level following an unexpected level increase. Operators were unable to stabilize SG level , due to the level tap design, which makes SG level control at low power more difficult.

1990-09-28

Intermediate head safety injection: 1 of 4 cold leg injection throttle valves had been closed since last refuelling outage.

1990-09-06

Failure in the steam line break analyses, regarding the ability of the valves to isolate auxiliary feed flow to a faulted SG.

1990-09-06

Failure in the steam line break analyses, regarding the ability of the valves to isolate auxiliary feed flow to a faulted SG.

1990-06-27

With 1 train of containment chiller out of service, the second developed a tube leak. Plant was shutdown when containment air temperatur exceeded the limit of 50°C.

1988-09-19

Loss of RHR caused by improperly monitored reactor vessel inventory (during refueling outage).