History
As a result of two separate probes into defective pipe welds, the Nuclear Regulatory Commission fined Cincinnati Gas and Electric $200,000 for a faulty quality assurance program. The NRC, under pressure, eventually ordered work on the nuclear reactor to halt in the autumn of 1982.
Cincinnati Gas and Electric, with two other electric utilities (American Electric Power and Dayton Power and Light), announced the cancellation of the Zimmer nuclear power plant in October 1983. Zimmer's total sunk costs equaled some $1.8 billion; Cincinnati's share amounted to $716 million, which was almost 90 percent of the utility's 1982 net worth.
Originally expected to cost $230 million, when the cost estimate soared to at least $3.4 billion the decision was made in 1984 to convert the plant. (Regulatory delays and high interest rates also contributed to the cost increase.)
The constructor, the Henry J. Kaiser Company, had never built a nuclear power plant before (or since). And the primary owner, Cincinnati Gas and Electric, did its own procurement, awarding contracts for equipment, e.g., for hundreds of valves, with inadequate specifications or QA requirements. Piping welds were not adequately radiographed.
Sargent & Lundy was the Architect/Engineering firm.
An ex-Navy admiral was hired to bring the plant on-line, and Bechtel was retained to nuclear-qualify the plant. However, Bechtel came in with an estimate of over $1.5 billion (to add to $ 1.7 billion already spent) to adequately complete the plant.
The conversion to coal-fired generation cost just over $1 billion, starting in 1987 and completed in 1991. It was the world's first nuclear-to-coal power plant conversion.
The plant was named for William H. Zimmer, who was chairman and president of Cincinnati Gas & Electric Company, 1962-1975.
Read more about this topic: William H. Zimmer Power Station
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