The chief of the United Nations atomic watchdog mentioned Tuesday that he would cross the entrance traces in Ukraine’s warfare in opposition to Russia to research circumstances at the Zaporizhzhia Nuclear Power Plant, the place the destruction of a close-by dam has compromised a key supply of water to chill its reactors.

After assembly with President Volodymyr Zelensky of Ukraine in Kyiv on Tuesday afternoon, Rafael Mariano Grossi, the director of the International Atomic Energy Agency, mentioned he was setting off on Tuesday night to the plant in southern Ukraine that’s occupied by Russian forces.

It was not clear what safety preparations had been reached with the warring sides however Mr. Grossi mentioned he hoped to spend a number of hours assessing the state of affairs on the plant, the place inspectors from the I.A.E.A. are already stationed. Mr. Grossi and Ukrainian officers have mentioned that there isn’t any imminent menace of a meltdown, however his journey appeared calculated to name the world’s consideration, once more, to the precarious state of affairs there.

An explosion every week in the past on the Kakhovka hydroelectric dam on the decrease Dnipro River unleashed a flood downstream and drained a lot of the reservoir that had served as the first supply of water for a cooling pond on the plant, which is vital to forestall a nuclear meltdown.

Mr. Grossi mentioned that the lack of the water provide in itself is just not a explanation for “immediate danger,” however that any drawback with the containment system for the pond on web site may show extremely difficult. The pond offers water to chill the nuclear gas contained in the plant’s six reactors in addition to spent nuclear gas.

“If there was a break in the gates that contained this water or anything like this, you would really lose all your cooling capacity,” he mentioned.

The pond is at present full and has a floor space of greater than three sq. miles and a depth of greater than 50 ft, in response to Ukrainian officers. The water degree is intently monitored and 5 of the nuclear plant’s six reactors are in chilly shutdown mode, which vastly reduces the quantity of water they require to make sure security. A sixth nonetheless produces some steam, which is used for the plant’s inner operation, Mr. Grossi mentioned.

Mr. Grossi has mentioned in current days that there’s sufficient water within the pond to final for “several months,” however on Tuesday he painted a extra pessimistic image, telling journalists that “there could be water for a few weeks or maybe a month or two.” He mentioned he was going to the plant to make a greater evaluation. The dam breach is “another step into the weakening of the safety net that one has in any nuclear power plant,” he added.

Mr. Zelensky mentioned in a press release later that he supported an I.A.E.A. proposal to ship its consultants to evaluate the danger.

Europe’s largest nuclear energy plant has confronted a sequence of crises since Russian forces seized it greater than a yr in the past amid a blaze of gunfire. Last summer season, it was subject to repeated shelling and on no less than one event artillery hit an space the place spent nuclear gas is saved.

Control of the plant, which is on the japanese financial institution of the Dnipro River, has given Moscow a level of leverage over Ukraine’s vitality manufacturing. It has not produced electrical energy for the grid since final yr besides it requires energy from outdoors for security functions.

A single high-voltage cable has been bringing electrical energy in for a lot of the warfare. It has repeatedly been severed by shelling, resulting in seven blackouts and the reliance on diesel turbines, whose capability will be measured in days, to maintain security techniques operating. On every event the exterior energy has been rapidly restored.

The danger that Ukraine faces on the nuclear plant stands aside, even amid the destruction of Russia’s full scale invasion, which has led to the occupation of components of the nation and the flight into exile as refugees of greater than 8 million folks. The United Nations says it has confirmed the deaths of about 9,000 civilians, however that it believes “the actual figures are considerably higher.”

It is the primary time {that a} nuclear energy plant has discovered itself in an lively battle zone, in response to Mr. Grossi, and concern over a possible accident is especially acute in a rustic that skilled the worst civilian nuclear catastrophe in historical past, on the Chernobyl plant in 1986.

Mr. Grossi spent months attempting to steer the governments in Kyiv and Moscow to set up a security zone around the Zaporizhzhia plant, however was unable to safe settlement. In current months, each side have constructed up their forces alongside a entrance within the area east of the nuclear plant in preparation for a Ukrainian counteroffensive to reclaim land misplaced to Russia. The Ukrainian assault started in current days and is predicted to assemble steam within the coming weeks.

More preventing within the neighborhood of the plant would worsen instability, Mr. Grossi has mentioned, however it isn’t the one danger. The British army intelligence company has launched satellite tv for pc photos displaying that Russian troops have established taking pictures positions on rooftops within the plant and have introduced in army tools. Ukrainian authorities additionally say that Russia has stationed troops on the plant earlier than they’re deployed to the frontline.

In addition, Russia has for greater than a yr sought to impose administration management at Zaporizhzhia, placing strain on native employees to interrupt their contracts with Ukraine’s nuclear vitality firm, Energoatom, and signal contracts with Rosatom, Russia’s personal state nuclear agency.

The workers of 11,000 has been lower to a skeletal crew. Mr. Grossi confirmed Tuesday that lots of the remaining employees will not be allowed to go to the power as a result of they refuse to signal contracts with its Russian controllers. Workers who’ve escaped into territory managed by Ukraine and a few nonetheless on the plant describe an more and more repressive setting. Some have accused the Russian occupation forces of detaining and torturing workers.

Nuclear consultants say that the Russian actions violate a cardinal rule of civilian nuclear security, which places a premium on secure administration management and a peaceful working setting.

This was the backdrop when the dam was destroyed final week, draining the reservoir. Engineering consultants say {that a} deliberate explosion contained in the dam, which was managed by Russian forces, most likely triggered its collapse.

In a measure of Kyiv’s mistrust of Moscow, the pinnacle of Ukraine’s intelligence company, the S.B.U. mentioned Tuesday that Russian troops may try and destroy the nuclear plant simply to forestall Ukraine’s counter offensive. He added, nevertheless, that it might be virtually not possible to explode the reactors.