CORRECTED - Pentagon eyes accelerated "bunker buster" bomb

* Bomb could be ready for B-2 bomber by July 2010

* Would deliver 10 times explosive power of predecessor (Corrects conversion in paragraph 12 to 9,500 kg)

By Jim Wolf

WASHINGTON, Aug 2 (Reuters) - The Pentagon is seeking to speed deployment of an ultra-large "bunker-buster" bomb on the most advanced U.S. bomber as soon as July 2010, the Air Force said on Sunday, amid concerns over perceived nuclear threats from North Korea and Iran.

The non-nuclear, 30,000-pound Massive Ordnance Penetrator, or MOP, which is still being tested, is designed to destroy deeply buried bunkers beyond the reach of existing bombs.

If Congress agrees to shift enough funds to the program, Northrop Grumman Corp (NOC.N)'s radar-evading B-2 bomber "would be capable of carrying the bomb by July 2010," said Andy Bourland, an Air Force spokesman.

"The Air Force and Department of Defense are looking at the possibility of accelerating the program," he said. "There have been discussions with the four congressional committees with oversight responsibilities. No final decision has been made."

The precision-guided weapon, built by Boeing Co (BA.N), could become the biggest conventional bomb the United States has ever used.

Carrying more than 5,300 pounds of explosives. it would deliver more than 10 times the explosive power of its predecessor, the 2,000-pound BLU-109, according to the Pentagon's Defense Threat Reduction Agency, which has funded and managed the seed program.

Chicago-based Boeing, the Pentagon's No. 2 supplier by sales, could be put on contract within 72 hours to build the first MOP production models if Congress signs off, Bourland said.

The threat reduction agency is working with the Air Force to transition the program from "technology demonstration" to acquisition, said Betsy Freeman, an agency spokeswoman.

Both the U.S. Pacific Command, which takes the lead in U.S. military planning for North Korea, and the Central Command, which prepares for contingencies with Iran, appeared to be backing the acceleration request, said Kenneth Katzman, an expert on Iran at the Congressional Research Service, the research arm of Congress.

"It's very possible that the Pentagon wants to send a signal to various countries, particularly Iran and North Korea, that the United States is developing a viable military option against their nuclear programs," Katzman said.

But he cautioned against concluding there was any specific mission in mind at this time.

BIGGEST BOMB

The MOP would be about one-third heavier than the 21,000-pound (9.500 kg) GBU-43/B Massive Ordnance Air Blast bomb -- dubbed the "mother of all bombs" -- that was dropped twice in tests at a Florida range in 2003.