UKRAINE-CHERNOBYL/(01 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(02 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(03 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
Ukraine Chernobyl(04 of16)
Open Image ModalIn this Monday, Nov. 14, 2016 photo an arch-shaped shelter, in Chernobyl, Ukraine. A gargantuan arch-shaped shelter has begun creeping toward the exploded Chernobyl nuclear reactor, in what represents a significant step toward liquidating the remains of the world\'s worst nuclear accident. (European Bank for Reconstruction and Development via AP) (credit:ASSOCIATED PRESS)
Ukraine Chernobyl(05 of16)
Open Image ModalIn this Thursday, Nov. 3, 2016 photo an arch-shaped shelter is photographed, in Chernobyl, Ukraine. A gargantuan arch-shaped shelter has begun creeping toward the exploded Chernobyl nuclear reactor, in what represents a significant step toward liquidating the remains of the world\'s worst nuclear accident. (European Bank for Reconstruction and Development photo via AP) (credit:ASSOCIATED PRESS)
CHERNOBYL-ANNIVERSARY/(06 of16)
Open Image ModalUkrainian President Petro Poroshenko delivers a speech during a commemoration ceremony on the 30th anniversary of the Chernobyl nuclear disaster, with a sarcophagus covering the damaged fourth reactor seen in the background, at the Chernobyl nuclear power plant, Chernobyl, Ukraine, April 26, 2016. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY (credit:Valentyn Ogirenko / Reuters)
CHERNOBYL-ANNIVERSARY/(07 of16)
Open Image ModalExterior view shows the New Safe Confinement (NSC) structure, with the sarcophagus covering the damaged fourth reactor seen in the background, at the Chernobyl nuclear power plant, Ukraine, April 26, 2016. REUTERS/Valentyn Ogirenko (credit:Valentyn Ogirenko / Reuters)
Ukraine Chernobyl Anniversary(08 of16)
Open Image ModalUkraine\'s President Petro Poroshenko, backdropped by Chernobyl nuclear power plant in Chernobyl, Ukraine, Tuesday, April 26, 2016, gives a speech to mark the 30th anniversary of the Chernobyl disaster. Ukraine on Tuesday marked the 30th anniversary of the explosion at the Chernobyl nuclear plant, the world\'s worst nuclear accident. (AP Photo/Sergei Chuzavkov) (credit:ASSOCIATED PRESS)
Ukraine Chernobyl Anniversary(09 of16)
Open Image ModalWorkers build an arch-shape confinement that will be moved on rails over the sarcophagus and reactor building at Chernobyl nuclear power plant in Ukraine, Tuesday, April 26, 2016. Ukraine on Tuesday marked the 30th anniversary of the explosion at the Chernobyl nuclear plant, the world\'s worst nuclear accident. (AP Photo/Sergei Chuzavkov) (credit:ASSOCIATED PRESS)
30th anniversary of Chernobyl nuclear disaster(10 of16)
Open Image ModalCHERNOBYL, UKRAINE - APRIL 27: A view from Reactor 4 at Chernobyl Nuclear power plant Zone is seen during the 30th anniversary of Chernobyl nuclear disasterin Chernobyl, Ukraine on April 27, 2016. The Chernobyl accident occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the city of Pripyat. (Photo by G��khan Balc/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
UKRAINE-CHERNOBYL/(11 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure (R) at the site of the Chernobyl nuclear reactor (L), Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(12 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(13 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(14 of16)
Open Image ModalA general view shows the construction of the New Safe Confinement (NSC) structure at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(15 of16)
Open Image ModalWorkers are seen near the dry spent nuclear fuel storage (ISF-2) under construction at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)
UKRAINE-CHERNOBYL/(16 of16)
Open Image ModalWorkers are seen near the dry spent nuclear fuel storage (ISF-2) under construction at the site of the Chernobyl nuclear reactor, Ukraine, March 23, 2016. REUTERS/Gleb Garanich (credit:Gleb Garanich / Reuters)