NY -- Standard&Poor's CreditWire 11/13/96 -- Standard&Poor's today has placed its ratings on Virginia Electric&Power Co. on CreditWatch with negative implications as follows: -- Senior secured debt and corporate credit rating at single-`A', -- Senior unsecured debt single-`A'-minus, -- Preferred stock at single-`A'-minus, and -- Commercial paper at `A-1'. Standard&Poor's also has placed its single-`A'-minus preferred stock rating on unit Virginia Power Capital Trust I on CreditWatch with negative implications. In addition, Standard&Poor's has affirmed its `A-2' commercial paper rating on parent company Dominion Resources Inc. The CreditWatch placement is in response to Dominion Resources' proposed $2.2 billion acquisition of East Midlands PLC. The rating action reflects the uncertainty regarding