Massachusetts Pension Reserves Investment Management Board, Boston, with $30 billion in assets, will issue RFPs for general and alternative investment consultants. Dates for issuance and returns have not been set. Three-year contracts for the incumbents, general consultant Wilshire Associates and alternative investment consultant Pathway Capital Management, expire in October. Wilshire has served MassPRIM since 1985; Pathway since 1994. The board issues RFPs for consulting services every three years, said Executive Director Scott Henderson.