Patent ID: 8433030

Claim:
A process for modifying the habit of crud or corrosion product deposits on nuclear power reactor primary circuit or secondary circuit surfaces comprising introducing into water circulating through the primary circuit or secondary circuit at least one crystal habit modifier which interacts, at the temperature and pressure within the respective primary circuit or secondary circuit, with crud or corrosion product deposit components, or crud or corrosion product deposit precursors, in an amount sufficient to slow, alter, or inhibit crud or corrosion product crystal growth, optionally comprising modifying the crystal habit of nickel ferrite or magnetite, wherein the crystal habit modifier comprises at least one of (1) titanium dioxide, (2) a phosphate or phosphonates, (3) an acrylate, (4) a trivalent cation, optionally Al3+ or Mn3+, (5) a borate, (6) polyacrylic acid, (7) cerium acetate, (8) potassium, (9) maleic acid, (10) an aluminate, (11) a silicate, or (12) a nickel species.