Categories 1 Through 4: How Ukrainian Law Defines a “Chornobyl Victim”

In April 2026, Ukraine’s Pension Fund announced that, as of January 1, 2026, 637,013 pensioners held the status of “victim” (потерпілий) of the Chornobyl nuclear disaster. By oblast, Kyiv Oblast had the most with 203,041, followed by Rivne Oblast with 93,620, Zhytomyr Oblast with 88,289, and the city of Kyiv with 30,840. This count covers only people receiving a pension, not everyone who holds the status.

So who counts as a “victim” in law? In Ukraine, that definition is still set by a law adopted by the Verkhovna Rada of the Ukrainian Soviet Socialist Republic in February 1991. The course of the accident itself is covered in our article on the Chornobyl nuclear accident.

Two Laws from February 1991

One is Law No. 791a-XII of February 27, 1991, “On the Legal Regime of Territory Contaminated with Radioactivity as a Result of the Chornobyl Disaster.” It divides the contaminated land into zones and sets the conditions for living and working there. The other is Law No. 796-XII, adopted the next day, “On the Status and Social Protection of Citizens Who Suffered as a Result of the Chornobyl Disaster,” which sets the status and benefits on the human side. Both laws were passed half a year before Ukraine declared independence.

Law No. 796-XII was entirely rewritten by Law No. 2001-XII of December 19, 1991, and has been amended repeatedly since. From an amendment in 2016 (No. 1339-VIII), the same law has also covered people involved in nuclear accidents other than Chornobyl, nuclear tests, and military exercises using nuclear weapons.

Cleanup Workers and Affected Residents

Article 9 of Law No. 796-XII divides the people covered by the law into four groups. At the core are two: “participants in the liquidation of the consequences of the accident” (учасники ліквідації наслідків аварії, cleanup workers) and “victims” (потерпілі) affected by radiation.

Under Article 10, cleanup workers are people who took direct part in the accident and cleanup work in the exclusion zone. Anyone who worked there in 1986–87 counts regardless of the number of days, while for 1988–90 at least 30 days of work is required. People who worked 14 days or more in 1986 at sanitary processing stations for residents or decontamination points for equipment are also included. Military personnel and people sent by state bodies or enterprises are also counted.

Under Article 11, victims include people evacuated from the exclusion zone, people resettled from heavily contaminated zones, people who lived in such zones, and people who still live, work, or study there. For those who currently live there, the condition is that, as of January 1, 1993, they had spent a set number of years (two, three, or four, depending on the zone) there.

The Internet Encyclopedia of Ukraine (CIUS) entry “Chornobyl nuclear disaster” (written 2023) states that 600,000 to 800,000 people across the USSR as a whole took part in the cleanup work, and that pensions, medical benefits, and free health resort stays given to millions of victims became a heavy burden on the state budget.

The Contaminated-Zone System

The zones are divided under Article 2 of Law No. 791a-XII, based on the amounts of cesium, strontium, and plutonium that accumulated in the soil and the additional annual radiation dose expected compared with before the accident. How to read the units is covered in our article on radiation units.

After the Definition of the Fourth Zone Was Removed

Law No. 76-VIII of December 28, 2014 (effective January 1, 2015) removed from Article 2 of Law No. 791a-XII the paragraph defining the fourth zone, the “zone of enhanced radioecological monitoring.” Meanwhile, Articles 18 and 19 of the same law still set out prohibitions and resident protections for this zone today, and category 4 of victim status still names people who live or work in it. In the text of the law, the zone’s name has remained even after its definition disappeared.

Article 2 provides that the Cabinet of Ministers decides the boundaries of the zones and publishes a list of the settlements within them and the results of dose surveys of residents once every three years.

Categories 1 Through 4

The content of the benefits changes according to the category set out in Article 14 of Law No. 796-XII.

Status is determined by documents (Article 15). For cleanup workers, this is a certificate of the work period issued by an employer or military enlistment office; for residents, certificates of residence or evacuation issued by the local authority. The format of the certificate (посвідчення) is set by Cabinet of Ministers Resolution No. 551 of July 11, 2018, with certificates of different colors issued by category and type. Which category a given person falls into is decided by the responsible authority based on such documents.

For pensions, Article 55 lowers the pension eligibility age for people who worked or lived in the contaminated areas. For example, cleanup workers who worked in the exclusion zone in 1986—any number of days through July 1, five days or more from July through December—can draw their pension ten years earlier. Since July 1, 2025, the Pension Fund has paid some of the compensation and allowances under this law.

Benefit Cuts and the Constitutional Court

The content of the benefits has been cut owing to the state’s fiscal situation, and each time the Constitutional Court has issued a ruling. Article 71 of Law No. 796-XII provides that “the provisions of this Law may not be suspended by any law other than one amending this Law.” Even so, provisions were added in 2011 and again in 2024–26 allowing certain articles to be applied by a method and amount decided by the Cabinet of Ministers.

Main Events from 2014 to 2026

The amounts and conditions of benefits can still change through budget laws and Cabinet decisions. Policy on protecting victims is now the responsibility of the Ministry of Social Policy, Family and Unity, renamed by Cabinet of Ministers Resolution No. 904 of July 21, 2025; the ministry’s regulations approved by that resolution list protecting “citizens who suffered as a result of the Chornobyl disaster” as one of its duties.