ML19256D741
| ML19256D741 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/07/1977 |
| From: | Stello V Office of Nuclear Reactor Regulation |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910220667 | |
| Download: ML19256D741 (2) | |
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SUMMARY
OF TMI-l OPERATING EXPERIENCE Metropolitan Edison Company declared TMI-l to be in comercial operation on September 2, 1974. During the first year of operation, wM.n did not include a refueling outage, the Unit Availability Factor, which is a measure of overall plant reliability, was reported to be 87*,.
The cumulative Unit Availability Factor, from the start of operation through December,1976, (which included one refueling outage) was reported to be 75.8L. The cumulative Reactor Availability Factor (which is a measure of the reliability of the reactor portion of the plant) over this same period was reported to be 80.St.
During 1975 nineteen reactor shutdowns were reported. Of these, six shutdowns required the plant to be at zero power in excess of one day. The longest reported interval at zero power was 17 days which was the time required to repair a large river water pump.
Three of the other reported shutdowns, ranging from 4 to 12 days duration, involved repairs to control rod drive units.
During 1976, a total of eight reactor shutdowns were reported. Of these, two were of extended duration. The shutdown for the first refueling of the plant, which was scheduled to take about eight weeks (beginning February 20,1976) actually extended to about thirteen weeks. Much of the extra time involved in this shutdown resulted from the discovery that the reactor vessel surveillance specimen holders were damaged and the subsequent need to remove the specimens and damaged holders. The second extended shutdown occurred in November 1976 and lasted about one month. This shutdown was required to repair a valve in the decay heat removal system, to perform repairs on the condenser and to repair cracks in some of the buried piping adjacent to the river water intake structure.
Based on the experience of other nuclear plants in commercial operation, it is concluded that the plant outages experienced thus far at TMI-l are within the normal range. Based on operating statistics, it can be concluded that the reported cumulative Unit Availability Factor for TMI-l through December 1976 is slightly above the average value for all plants in comercial operation.
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