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Pakistan may be building powerful nuclear reactor

WASHINGTON -- Pakistan has begun building what independent analysts say is a powerful new reactor for producing plutonium, a move that, if verified, would signal a major expansion of the country's nuclear weapons capabilities and a potential new escalation in the region's arms race.

Satellite photos of Pakistan's Khushab nuclear site show what appears to be a partially completed heavy-water reactor capable of producing enough plutonium for 40 to 50 nuclear weapons a year, a 20-fold increase from Pakistan's current capabilities, according to an assessment by Washington-based nuclear experts.

The construction site is adjacent to Pakistan's only plutonium production reactor, a modest, 50-megawatt unit that began operating in 1998. By contrast, the dimensions of the new reactor suggest a capacity of 1,000 megawatts or more, according to analysis by the Institute for Science and International Security. Pakistan is believed to have 30 to 50 uranium warheads, which tend to be heavier and more difficult than plutonium warheads to mount on missiles.

``South Asia may be heading for a nuclear arms race that could lead to arsenals growing into the hundreds of nuclear weapons, or at minimum, vastly expanded stockpiles of military fissile material," the institute's David Albright and Paul Brannan concluded in the technical assessment, a copy of which was provided to The Washington Post.

The assessment's key judgments were endorsed by two other independent experts who reviewed the commercially available satellite images, provided by Digital Globe, and supporting data. In Pakistan, officials would not confirm or deny the report, but a senior Pakistani official, speaking on condition of anonymity, acknowledged an expansion was underway.

``Pakistan's nuclear program has matured. We're now consolidating the program with further expansions," the official said. The expanded program includes ``some civilian nuclear power and some military components," he said.

The development raises fresh concerns about a decades-old rivalry between Pakistan and India. Both countries have dozens of nuclear warheads, a variety of missiles and other means for delivering them.

Pakistan, like India, has never signed the nuclear Non-Proliferation Treaty.

The evidence of a possible escalation comes as Congress prepares to debate a controversial nuclear cooperation agreement between the Bush administration and India. The agreement would grant India access to sensitive US nuclear technology in return for placing its civilian nuclear reactors under tighter safeguards.

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