Holtec Nuclear Corp., a supplier of specialty services to the nuclear power industry, suspended its planned US initial public offering, according to people familiar with the matter. The Camden, New Jersey-based firm had been set to raise as much as $900 million in the IPO, offering 50 million shares for $15 to $18 each, according to earlier filings with the US Securities and Exchange Commission. The offering was expected to price Thursday, according to a marketing presentation seen earlier.