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Sulfate hideout in heated crevices: Final report

Technical Report ·
OSTI ID:6498598
;
The hideout of Na/sub 2/SO/sub 4/ and Na(NH/sub 4/)SO/sub 4/ was investigated using three different heated crevices, two SO/sub 4/ concentrations (2 mg/kg and 20 ..mu..g/kg) with two available superheats (17 and 44/sup 0/C) representing cold and hot-leg conditions in a PWR steam generator. The crevices used were laboratory simulations of (1) a packed annular crevice between a heated alloy 600 tube and a 405 steel support plate; (2) a clean eccentric crevice; (3) the crevice formed by hydraulic expansion of a tube into a support plate. Under all conditions, Na/sub 2/SO/sub 4/ accumulated in the crevices at a constant rate until an equilibrium was reached or approached. The hideout of Na(NH/sub 4/)SO/sub 4/ led to corrosion of both tube and support plate. Under hot-leg conditions, the maximum rate of hideout was 0.17 mg/ppM-hour in the packed annular crevice, and about 0.12 mg/ppM-hour in the eccentric and expanded tube crevices. Lower rates were found for cold leg conditions.
Research Organization:
Electric Power Research Inst., Palo Alto, CA (USA); Central Electricity Research Labs., Leatherhead (UK)
OSTI ID:
6498598
Report Number(s):
EPRI-NP-5156; ON: TI87920428
Country of Publication:
United States
Language:
English

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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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ALKALI METAL COMPOUNDS
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AMMONIUM COMPOUNDS
AMMONIUM SULFATES
BOILERS
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NICKEL ALLOYS
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NIOBIUM ALLOYS
OXYGEN COMPOUNDS
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SODIUM COMPOUNDS
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STAINLESS STEEL-405
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STEAM GENERATORS
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TESTING
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