Impact of the Precipitation of Boric Acid and its Salts on the Operability of Passive Safety Systems During Serious Accidents in NPP

Impact of the Precipitation of Boric Acid and its Salts on the Operability of Passive Safety Systems During Serious Accidents in NPP

One of the problems of accidents in NPP with VVER is the evaporation of the primary coolant in the containment. Boric acid H 3 BO 3 can ingress into the containment together with steam and crystallize, independently or in the form of salts, on heat-exchange and other surfaces of equipment placed in...

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Bibliographic Details
Published in:Atomic energy (New York, N.Y.) Vol. 126; no. 2; pp. 88 - 95
Main Authors: Fis’kov, A. A., Bezlepkin, V. V., Semashko, S. E., Vardanidze, T. G., Pogrebenkov, V. M., Ditts, A. A.
Format: Journal Article
Language:English
Published: New York Springer US 01-06-2019
Springer
Springer Nature B.V
Subjects:
Accidents
Acids
Boric acid
Containment
Crystallization
Energy industry
Evaporation
Hadrons
Heat
Heat exchange
Heat exchangers
Heavy Ions
Hydrogen
Nuclear Chemistry
Nuclear Energy
Nuclear Physics
Nuclear power plants
Physics
Physics and Astronomy
Preservatives
Safety and security measures
Safety systems
Salts
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Summary:One of the problems of accidents in NPP with VVER is the evaporation of the primary coolant in the containment. Boric acid H 3 BO 3 can ingress into the containment together with steam and crystallize, independently or in the form of salts, on heat-exchange and other surfaces of equipment placed in the containment, thereby lowering the efficiency of passive systems removing heat from the containment and the removal of hydrogen. The results of an experimental investigation of the deposition of insoluble aerosols and salts of boric acid on heat-exchange surfaces of the passive heat-removal system and the surfaces of autocatalytic hydrogen recombiners during serious accidents in NPP are reported. It is shown that the impact of crystallization of boric acid and its salts on the operability of these systems is very small.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-019-00520-6