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[en] The lives of CEGB Magnox stations were considered to have two components when they were first built. The engineering of the structures was conceived to provide substantial margins within the plant for the proposed duty. These structures were believed to be capable of at least 20 years continuous operation and good chances of even 40 years for certain parts of the structures. For financial planning purposes, the initial authorization of the costs of building and operation were to be spread over 20 years. After 10 years of operation a planned lifetime of 25 years, for each Magnox plant with a steel pressure vessel, was declared by the CEGB. More recently a review in 1984 led to extending their lives further. The paper to be presented reviews the factors used by the CEGB to derive the economic worth of these stations in terms of the marginal savings that could arise from extending the operation of the plants. These factors and the model incorporating them form the basis of the decisions taken by management on lifetime issues
Source
Nuclear Energy Agency, 75 - Paris (France); 399 p; ISBN 92-64-02967-2; 
; 1987; p. 326-336; Organisation for Economic Co-operation and Development; Paris (France); Symposium on nuclear power plant life extension; Paris (France); 24-27 Feb 1987
; 1987; p. 326-336; Organisation for Economic Co-operation and Development; Paris (France); Symposium on nuclear power plant life extension; Paris (France); 24-27 Feb 1987
[en] Operating experience with the circulators of the first generation of Magnox gas-cooled reactors in the UK, both steam-driven and A.C. electric drive, is discussed. An analysis is made of CEGB experience. The following aspects are discussed: operating experience relevant to loss of main circulators leading to reactor outrage; availability related operating experience with an analysis of outage times for Hinkley Point 'A'; incidence of circulator outages for stations with steam driven circulators; comparison of the incidence and frequency of circulator trips with other enforced circulator outages. The frequency loss of all main circulator drives is about 0.26 per reactor year for steam-driven circulators, and is somewhat lower for A.C. motor drives, although for variable frequency drives alone it is about 0.7. A frequency of 0.29 per reactor year appears representative for reactor outage caused by a single circulator failure. It is concluded that circulator faults, per se, do not contribute greatly to forced reactor outages. If circulators can be isolated for repair, they do not substantially affect total loss of output. (U.K.)
Journal
Nuclear Engineering International; ISSN 0029-5507; ; v. 22(261); p. 57-60
; v. 22(261); p. 57-60
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