HTGR Knowledge Base

Conference Article: Maintenance concept of the gas turbine in a 1640 MW direct cycle HTR

Schmied, H.; Karaus, H. (Brown Boveri and Company Ltd., Baden, Germany, F.R.); Roellig, K. (Hochtemperatur-Reaktorbau G.m.b.H., Mannheim (Germany, F.R.)); Schenker, E. (Eidgenoessisches Inst. fuer Reaktorforschung, Wuerenlingen (Switzerland))

Abstract

The description which follows refers to a helium-cooled high-temperature reactor with a gas turbine and a thermal output of 1640 MW. The turbomachine which comes into contact with the cooling gas is contaminated with radioactivity during its operation. For the maintenance of the turbomachine, a major inspection is planned at six-year intervals. This overhaul involves disassembling and dismantling the turbomachine. Two minor inspections, at two-year intervals, are planned between the major inspections. The minor inspections involve inspection of the bearings, for which purpose the turbomachine does not have to be disassembled and dismantled. This paper presents in summarized form the sequence in which the maintenance work is to be carried out for both the major and minor inspections. The shutdown time and the collective dose were estimated to this end. Costs have not yet been determined. Details of the concept are given and significant results from the areas dealing with release, deposition and decontamination have been appropriately adapted.

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key words: contamination; decontamination; diagrams; engineering; gas turbines; htgr type reactors; inspection; maintenance; cleaning; gas cooled reactors; graphite moderated reactors; information; reactors; turbines
Reference:
Specialists meeting on coolant chemistry, plate-out and decontamination in gas-cooled reactors Juelich, Federal Republic of Germany 2-4 December 1980
International Atomic Energy Agency, Vienna (Austria)
IWGGCR--2, pp:118-125