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US 2006/0065212 A1Published application
Chemical cleaning of a steam generator during mode 5 generator shut down
AssigneeFramatome ANP GmbH
InventorsJohn Remark, Sarah Evans
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Abstract
A Nuclear Steam Supply Stem (NSSS) Mode 5 Steam Generator Chemical Cleaning system is disclosed which applies chemical cleaning solvent (formulated to remove SG deposits) to the secondary side of the SG using primary side supplied heat during NSS Mode 5 shutdown to maintain the desired application temperature. Mixing is achieved via nitrogen sparging.
Claims9
A method of cleaning a steam generator during mode 5 shut down operations at approximately 200 degrees F. to 210 degrees F. comprising the steps of:
- injecting a precalculated amount of chemical cleaning solvent into into the steam generator;
- introducing a nitrogen sparge into the steam generator to mix the solvent;
- and
- removing the mixed solvent after a predetermined period of time.
1 more element
Dependencies are inferred from the claim text.