The UTRUNC function  converts  the  parameter  and  returns  its
  unsigned  equivalent  by  truncating  the fractional part of the
  value.

  Syntax:

     UTRUNC( x )

  The parameter 'x' must be  of  type  REAL,  SINGLE,  DOUBLE,  or
  QUADRUPLE.

  No error results if the value of 'x' is negative or greater than
  4,294,967,295.   In  that  case,  the  unsigned  result  is  the
  truncated parameter value MOD 4,294,967,296.