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this final source has authority ,credit and multiple source because the writer has been thru the undamaged sector 5 which is similar to sector 3. credit. he named all the people who he had been with or gave him vital information about the reactor 3 . he even had the photo cited with the photographers name, the time it was taken also where . finally multiple source, NHK, used the piece of writing , to conclude that japan has begin their "engineering revolution" to finally reduce the radioactivity level down to 3.7 IPS and 4.56 UPS

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A Tepco guide explained this was because the central plant grounds had been deforested and paved over, sealing in contaminated soil.

During a recent visit, the mood within the plant was noticeably more relaxed, though movements were still tightly controlled and everyone was required to wear radiation-measuring badges. Inside a "resting building," workers ate in a large cafeteria and bought snacks in a convenience store.

At the plant's entrance, a sign warned: "Games like Pokemon GO are forbidden within the facility."

"We have finished the debris cleanup and gotten the plant under control," said the guide, Daisuke Hirose, a spokesman for Tepco's subsidiary in charge of decommissioning the plant. "Now, we are finally preparing for decommissioning."

In September, the prime minister's office set a target date of 2021 - the 10th anniversary of the disaster - for the next significant stage, when workers begin extracting the melted fuel from at least one of the three destroyed reactors, though they have yet to choose which one.

The government admits that cleaning up the plant will take at least another three to four decades and tens of billions of dollars. A $100 million research center has been built nearby to help scientists and engineers develop a new generation of robots to enter the reactor buildings and scoop up the melted fuel.

At Chernobyl, the Soviets simply entombed the charred reactor in concrete after the deadly 1986 accident. But Japan has pledged to dismantle the Fukushima plant and decontaminate the surrounding countryside, which was home to about 160,000 people who were evacuated after accident.

Many of them have been allowed to return as the rural towns around the plant have been decontaminated. But without at least starting a cleanup of the plant itself, officials admit they will find it difficult to convince the public that the accident is truly over.

They also hope that beginning the cleanup will help them win the public's consent to restart Japan's undamaged nuclear plants, most of which remain shut down since the disaster.

Tepco and the government are treading cautiously to avoid further mishaps that could raise doubts that the plant is under control.

"They are being very methodical - too slow, some would say - in making a careful effort to avoid any missteps or nasty surprises," said David Lochbaum, director of the nuclear safety project at the Union of Concerned Scientists, who was a co-author of a book on the disaster.

"They want to regain trust. They have learned that trust can be lost much quicker than it can be recovered."

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fukushima daiichi nuclear power plant (japan)

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Six Years After Fukushima, Robots Finally Find Reactors' Melted Uranium Fuel

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A Tepco guide explained this was because the central plant grounds had been deforested and paved over, sealing in contaminated soil. During a recent visit, the mood within the plant was noticeably more relaxed, though movements were still tightly controlled and everyone was required to wear radiation-measuring badges.

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another source i found that was reliable was also from the new York times. it has multiple areas that  link up to other articles related to this topic. the article also puts names of the people that they quote. this topic even is related to politics.

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Private analysts agreed that the Hwasong-15 looked bigger and more powerful than the Hwasong-14.

Kim Dong-yub, a defense analyst at the Seoul-based Institute for Far Eastern Studies, said North Korea appeared to have built the Hwasong-15 by upgrading the second stage of the Hwasong-14, which carries the missile through space after the first-stage booster drops off.

Mr. Kim also reported an important discovery: He said the Hwasong-15 appeared to have two engines for its first booster stage, giving the new missile greater range than previous models.

Tal Inbar, head of space research at Israel's Fisher Institute for Air and Space Strategic Studies, agreed in a message on Twitter.

Mr. Kim said, "This is indeed a new type of missile."

He said that if the missile's first stage was in fact powered by two engines instead of one, it would dispel earlier speculation among some analysts that North Korea might have loaded a very light mock warhead on the Hwasong-15 so it could fly farther.

Chang Young-keun, a missile expert at Korea Aerospace University near Seoul, also said two Hwasong-14 booster engines were bundled together to propel the Hwasong-15, giving it the true range of an ICBM. North Korean engineers may also have helped the Hwasong-15 fly farther by fitting its thicker second stage with more fuel or more thrusters, which are secondary rocket engines commonly used for adjustments and velocity of a missile, he said.

The new missile's size and heft have required North Korea to build a bigger transporter-launcher vehicle. The new vehicle featured nine axles, compared with the eight-axle truck used to carry the Hwasong-14.

South Korean defense officials say North Korea runs more than 160 mobile missile launching vehicles and is building more. Such vehicles make it easier to hide and transport missiles and harder for the United States and its allies to track signs of imminent missile attacks.

North Korea claims to be able to launch its missiles from anywhere, anytime. As if to drive its point home, each of the three ICBMs North Korea has launched so far was fired from a different location.

The photos also revealed that the Hwasong-15 has a rounder nose cone than the Hwasong-14. In Russian and American ICBM designs, such nose cones often mean that the missiles carry multiple warheads, analysts said. But they doubted that North Korea had the ability to hit an intercontinental target with a warhead yet, much less deliver multiple warheads on the same missile.

Michael Elleman, a missile expert at the International Institute for Strategic Studies in Washington, drew similar conclusions in his analysis of the photos and video released by North Korea. In a report published Thursday, Mr. Elleman said his "initial calculations indicate the new missile could deliver a moderately sized nuclear weapon to any city on the U.S. mainland."

But he also said the North Koreans would need to conduct additional tests to establish the Hwasong-15's reliability. And like other aerospace experts, Mr. Elleman pointed out that North Korea had yet to show it had mastered technology to ensure a missile warhead survives the rigors of violent re-entry into the Earth's atmosphere.

Still, he said, "if low confidence in the missile's reliability is acceptable, two or three test firings over the next four to six months may be all that is required before Kim Jong-un declares the Hwasong-15 combat ready."

During a phone conversation with President Trump on Thursday, President Moon Jae-in of South Korea said that the Hwasong-15 was "the most advanced North Korean missile yet, in all aspects," according to his office.

But he said it had not proved that North Korea has accomplished re-entry technology, or an ability to guide the warhead to its target.

The two presidents reaffirmed their determination to maximize sanctions to stop North Korea from further advancing its technologies and to pressure it to return to nuclear disarmament talks, Mr. Moon's office said.

Other pictures showed North Korea's leader, Kim Jong-un, celebrating the launch with his key missile scientists, Jang Chang-ha and Jon Il-ho. Both Mr. Jang and Mr. Jon are important players in North Korea's efforts to build a nuclear-tipped intercontinental ballistic missile.

Mr. Kim was also accompanied by Jo Yong-won and Yu Jin, top officials from the Munitions Industry Department of his Workers' Party. The party agency oversees the country's weapons development.

When the department submitted a plan for this week's test of the Hwsong-15, Mr. Kim approved it with his characteristic handwriting: "For the party and for the fatherland, launch the missile bravely!"

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North Korea's New Missile Is Bigger and More Powerful, Photos Suggest

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Private analysts agreed that the Hwasong-15 looked bigger and more powerful than the Hwasong-14. Kim Dong-yub, a defense analyst at the Seoul-based Institute for Far Eastern Studies, said North Korea appeared to have built the Hwasong-15 by upgrading the second stage of the Hwasong-14, which carries the missile through space after the first-stage booster drops off.

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this source is not independent because there are multiple news etc BBC ABC talking about this with evidence quotes, which brings us into authority, there are people who are experts or are well known so that the information given is trusted by many people

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"Kim Jong-un is diverting all of his resources to a mad dash to get to a demonstration of a nuclear-capable intercontinental ballistic missile that can reach the United States, in the hopes that it will so frighten the U.S. and the world that we will agree to pay ransom, that we will pay him hush money, that we will pay him off in sanctions relief and other concessions in exchange for relative good behavior, no more tests, no more threats," Daniel R. Russel, who was the United States assistant secretary of state for East Asian affairs from 2013 until March, told reporters in Beijing.

"That's a fool's deal," Mr. Russel said.

Analysts in South Korea doubted that the North was signaling a willingness to discuss a freeze. Rather, they said, Pyongyang is blustering to buy time, and it will not be seriously interested in talks with Washington until it truly acquires the capabilities it claims to have, after more tests.

The North said its launch Wednesday was of a new intercontinental ballistic missile called the Hwasong-15, which it said could deliver "super-large heavy" warheads anywhere in the mainland United States. It flew higher and longer - to an altitude of 2,800 miles, and for 53 minutes - than its Hwasong-14 ICBM did when the North tested it twice in July.

But there are reasons to suspect that the North was exaggerating its capabilities. Though the missile flew high, the North did not send it far; it splashed down in waters just 600 miles from the launch site. Nor has the North shown that it has a warhead that can survive the intense heat and friction of re-entering the earth's atmosphere from space, a crucial technological hurdle.

On a normal trajectory, a missile that can soar 2,800 miles into space could indeed fly far enough to reach New York and Washington from North Korea, missile experts said. But they said the North could have launched its missile on Wednesday with a very light mock warhead or no payload, sending it farther than it could go with a real warhead.

"North Korea is bluffing," said Chang Young-keun, a missile expert at Korea Aerospace University near Seoul, the South Korean capital.

Kim Dong-yub, a defense analyst at the Seoul-based Institute for Far Eastern Studies, doubted that the North would consider a freeze until it had test-launched an ICBM on a normal trajectory over the Pacific and proved an atmospheric re-entry technology. "Its announcement today is likely for domestic propaganda," Mr. Kim said. "It will continue in its own way to solve its technical problems in its missile program."

Kim Jong-un has boasted in recent months that his country was in the "final" stage of achieving full ICBM capabilities. Shin Beom-chul, a security expert at the government-run Korea National Diplomatic Academy in Seoul, said the North needed to announce it had done so before the end of the year. "What North Korea announced today was not a technical but a political pronouncement," he said.

Even if the North were open to discussing a freeze, there has been no indication that the United States and its allies would respond positively. Washington insists on a "complete, verifiable and irrevocable dismantlement" of the North's nuclear arsenal.

China, which expressed "grave concern and opposition" over the latest launch, has continued to push for talks about a freeze. President Xi Jinping sent a special envoy to Pyongyang this month to urge Mr. Kim to consider it. But Mr. Kim did not even meet with him, and he further insulted Beijing by conducting its latest missile test only days after the envoy's departure.

Lee Sung-yoon, a Korea expert at the Fletcher School of Law and Diplomacy at Tufts University, said the North had everything to gain at this point by provoking China and the United States.

"Now, in the wake of an apparent ICBM test with the longest range to date, voices calling for relaxing sanctions - since, it will be claimed, sanctions don't work - and returning to dialogue without preconditions will grow louder," Mr. Lee said. "For Pyongyang, the way to get sanctions lifted is not through making concessions, but resorting to further escalation."

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North Korea Says It's Now a Nuclear State. Could That Mean It's Ready to Talk?

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"Kim Jong-un is diverting all of his resources to a mad dash to get to a demonstration of a nuclear-capable intercontinental ballistic missile that can reach the United States, in the hopes that it will so frighten the U.S.