--Fourteen companies on path to sell a combined $13.6bln of high-grade bonds

--Issuers rushing to sell bonds ahead of unpredictable events later this week

--Walgreens leads market with five-part, multi-billion dollar deal

The corporate-bond market is making a run at the busiest session of the year, with 14 companies planning to sell at least $13.6 billion of high-grade debt Monday.

The 2012 volume record for a single day is $16.9 billion, set March 5, according to data provider Dealogic. The record number of deals is 13, also from March 5.

Drugstore chain Walgreen Co. (WAG) is leading the session in a five-part deal with a range of maturities, from 18-month notes to 30-year bonds. An early term sheet indicates the company intends to use $3 billion of the proceeds to repay loans, with other proceeds directed at general corporate purposes.

Pharmaceutical giant Merck & Co. (MRK), food packager ConAgra Foods Inc. (CAG), and electricity provider Dominion Resources Inc. (D) are each issuing three-part deals.

How large the deals will be is still being determined as banks market the bonds to investors. A strong response could drive the volume toward the year's record or beyond.

For issuers, the aim is to complete bond sales ahead of any event that could rattle the calm markets. Toward that end, this week's issuance is expected to be heaviest Monday and Tuesday, so borrowers can avoid any disappointment that may follow the Federal Reserve's two-day monetary policy meeting, which begins Wednesday.

In Europe, an expected ruling Wednesday by Germany's Constitutional Court on the legality of the European Stability Mechanism bailout fund for debt-strapped nations, could also weigh on markets.

The market is already facing some headwinds Monday. Markit's CDX North America Investment Grade Index, a proxy for investor confidence based on the cost of protecting against default, has weakened 1% in early afternoon trading. This indicates the cost of insurance against default has risen, albeit slightly.

Jody Lurie, corporate credit analyst at Janney Capital Markets, said the modestly negative tone might be convincing some borrowers to place their bonds now instead of waiting, just in case markets turn and the opportunity fades.

"There's definitely an open window, so everyone wants to rush in now and check it off while they can," Ms. Lurie said.

Last week, details of the European Central Bank's distressed euro-nation bond-buying program boosted confidence for investors looking to boost returns by purchasing lower-rated fixed-income assets. That enabled the risk premium on corporate bonds, expressed through the interest paid by lenders over comparable U.S. Treasurys, to decline.

According to the Barclays U.S. investment-grade index, the extra yield, or spread, on the average high-grade corporate bond fell 0.05 percentage point last week, to 1.67 points, a new 13-month low.

Among the large companies taking advantage of tight spreads to issue $1 billion or more are oil and gas well driller Transocean Ltd. (RIG), Russian state majority-owned Gazprom OAO (OGZPY, GAZP.RS), natural-gas provider Oneok Inc. (ONE), and the Commonwealth Bank of Australia (CBAUY, CBA.AU).

Smaller deals include bonds from valves manufacturer Tyco Flow Control, a unit of Tyco International Ltd. (TYC), cleaning products company Clorox Co. (CLX), electronic measurement designer Agilent Technologies Inc. (A), energy provider Public Service Enterprise Group Inc. (PEG), Exelon Corp. (EXC) natural gas unit Peco Energy, and South Korea's Nonghyup Bank.

Write to Patrick McGee at patrick.mcgee@dowjones.com

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