Chernobyl disaster - Triggering an alarm of low steam pressure in the steam separators before the explosion
Time: Saturday Apr 26, 1986 at 01:19:00 AM
Place: Chernobyl, Ukraine, U.S.S.R
Details: The flow exceeded the allowed limit at 01:19, triggering an alarm of low steam pressure in the steam separators. At the same time, the extra water flow lowered the overall core temperature and reduced the existing steam voids in the core and the steam separators. Since water absorbs neutrons better than steam, the neutron flux decreased and reduced the reactor power. The crew responded by turning off two of the circulation pumps to reduce feedwater flow in an effort to increase steam pressure, and by removing more manual control rods to maintain power.
Related
Near
![Chernobyl disaster-Ukraine opened up the sealed zone around the Chernobyl reactor to tourists](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-Ukraine opened up the sealed zone around the Chernobyl reactor to tourists
2011 - Chernobyl, Ukraine
![Chernobyl disaster-Soviet medical teams](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-Soviet medical teams
1987 - Chernobyl, Ukraine, U.S.S.R
![Chernobyl disaster-The second test to Chernobyl nuclear power plant](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-The second test to Chernobyl nuclear power plant
1984 - Chernobyl, Ukraine, U.S.S.R
![Chernobyl disaster-Thirty-one deaths were directly attributed to the Chernobyl disaster](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-Thirty-one deaths were directly attributed to the Chernobyl disaster
1994 - Chernobyl, Ukraine
![Chernobyl disaster-Reactor No. 1 was decommissioned as part of a deal between the Ukrainian government and international organizations](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-Reactor No. 1 was decommissioned as part of a deal between the Ukrainian government and international organizations
Nov, 1996 - Chernobyl, Ukraine
On This Day - 26 April
![Disasters with highest death tolls-662 Damghan Earthquake](/assets/placeholder.png)
![disasters](https://historydraft.com/files/f8eb75bc-0e08-4bda-9c54-f6dbee2cc2e4.160.webp)
Disasters with highest death tolls-662 Damghan Earthquake
Saturday Apr 26, 662 - Umayyad Caliphate (now Iran)
![Holy Roman Empire-1220 Confoederatio cum principibus ecclesiasticis](/assets/placeholder.png)
![Banner of the Holy Roman Empire](https://historydraft.com/files/ba602daf-c952-4630-a391-9a8ad7e5761e.160.webp)
Holy Roman Empire-1220 Confoederatio cum principibus ecclesiasticis
Sunday Apr 26, 1220 - Germany, Holy Roman Empire
![Disasters with highest death tolls-1721 Tabriz Earthquake](/assets/placeholder.png)
![disasters](https://historydraft.com/files/f8eb75bc-0e08-4bda-9c54-f6dbee2cc2e4.160.webp)
Disasters with highest death tolls-1721 Tabriz Earthquake
Saturday Apr 26, 1721 - Tabriz, East Azarbaijan, Iran
![Abraham Lincoln-Booth died](/assets/placeholder.png)
![Abraham Lincoln](https://historydraft.com/files/e2ca4bad-3a04-46db-afab-aa34f059894a.160.webp)
Abraham Lincoln-Booth died
Wednesday Apr 26, 1865 - Virginia, U.S.
![Memorial day-Sue Landon Vaughan decorations](/assets/placeholder.png)
![Graves at Arlington on Memorial Day Image](https://historydraft.com/files/05aa04df-c860-40eb-ab6d-6f9659f5ffe0.160.webp)
Memorial day-Sue Landon Vaughan decorations
Wednesday Apr 26, 1865 - Jackson, Mississippi, U.S.
26 April 1986
![Mikhail Gorbachev-Chernobyl disaster](/assets/placeholder.png)
![Mikhail Gorbachev Image](https://historydraft.com/files/2dfa0f3f-04cf-411a-a8b2-d3b4a8490897.160.webp)
Mikhail Gorbachev-Chernobyl disaster
Saturday Apr 26, 1986 - Chernobyl, Ukraine
![Nuclear Power-The Chernobyl disaster](/assets/placeholder.png)
![Nuclear power](https://historydraft.com/files/9b1b7f68-8309-4a68-843f-f6528ff98984.160.webp)
Nuclear Power-The Chernobyl disaster
Saturday Apr 26, 1986 - Ukraine, U.S.S.R.
![Chernobyl disaster-A commission was established to investigate the accident](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-A commission was established to investigate the accident
Saturday Apr 26, 1986 - Chernobyl, Ukraine, U.S.S.R
![Atomic Bomb-Chernobyl disaster](/assets/placeholder.png)
![Mushroom cloud above Nagasaki after atomic bombing](https://historydraft.com/files/6b23c9ed-a350-49c4-beb0-fa8c04909547.160.webp)
Atomic Bomb-Chernobyl disaster
Saturday Apr 26, 1986 - Chernobyl, Ukraine, Soviet Union (Now Ukraine)
April 1986
![Ted Bundy-New date (July 2) was announced](/assets/placeholder.png)
![Ted Bundy](https://historydraft.com/files/04539d74-392f-45ac-b829-93f8e6504e65.160.webp)
Ted Bundy-New date (July 2) was announced
Apr, 1986 - U.S.
![Mikhail Gorbachev-Chernobyl disaster](/assets/placeholder.png)
![Mikhail Gorbachev Image](https://historydraft.com/files/2dfa0f3f-04cf-411a-a8b2-d3b4a8490897.160.webp)
Mikhail Gorbachev-Chernobyl disaster
Saturday Apr 26, 1986 - Chernobyl, Ukraine
![Nuclear Power-The Chernobyl disaster](/assets/placeholder.png)
![Nuclear power](https://historydraft.com/files/9b1b7f68-8309-4a68-843f-f6528ff98984.160.webp)
Nuclear Power-The Chernobyl disaster
Saturday Apr 26, 1986 - Ukraine, U.S.S.R.
![Chernobyl disaster-A commission was established to investigate the accident](/assets/placeholder.png)
![Chernobylreactor](https://historydraft.com/files/404f25a8-16e5-4e11-83f7-e1634d5f6092.160.webp)
Chernobyl disaster-A commission was established to investigate the accident
Saturday Apr 26, 1986 - Chernobyl, Ukraine, U.S.S.R
![Atomic Bomb-Chernobyl disaster](/assets/placeholder.png)
![Mushroom cloud above Nagasaki after atomic bombing](https://historydraft.com/files/6b23c9ed-a350-49c4-beb0-fa8c04909547.160.webp)
Atomic Bomb-Chernobyl disaster
Saturday Apr 26, 1986 - Chernobyl, Ukraine, Soviet Union (Now Ukraine)
1986
![Ayman al-Zawahiri-Meeting Min Laden for the First Time](/assets/placeholder.png)
![Ayman al-Zawahri](https://historydraft.com/files/7f1f071a-0137-47e2-9cff-b61bbb64b970.160.webp)
Ayman al-Zawahiri-Meeting Min Laden for the First Time
1986 - Jeddah, Saudi Arabia
![Amancio Ortega-Divorce](/assets/placeholder.png)
![Amancio Ortega Portrait](https://historydraft.com/files/40917fd1-a499-4654-85e8-de39a3f25c04.160.webp)
Amancio Ortega-Divorce
1986 - Spain
![Magdi Yacoub-British Heart Foundation Professor of Cardiothoracic Surgery at the National Heart and Lung Institute](/assets/placeholder.png)
![Magdi Yacoub](https://historydraft.com/files/9b0bbc3f-caa8-424b-93fc-91c91aad1557.160.webp)
Magdi Yacoub-British Heart Foundation Professor of Cardiothoracic Surgery at the National Heart and Lung Institute
1986 - Chelsea, London, England
![Cameras-Canon RC-701](/assets/placeholder.png)
![Canon Camera](https://historydraft.com/files/c1ccc552-2176-4064-8797-ff9a7aed0ea6.160.webp)
Cameras-Canon RC-701
1986 - Japan
![1989 Tiananmen Square protests-Professor Fang Lizhi began a Personal Tour around Universities In China](/assets/placeholder.png)
![Tiananmen Square, Beijing, China 1988](https://historydraft.com/files/d5c4f6d3-cb90-4bd3-9360-12f8137f45ab.160.webp)
1989 Tiananmen Square protests-Professor Fang Lizhi began a Personal Tour around Universities In China
1986 - China