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Unplanned Capability Loss Factor

Includes all reactors that were in commercial operation within 2023 and 2025
Country 2023 2024 2025 2023 - 2025
Number of Reactors UCL
[%] 		Number of Reactors UCL
[%] 		Number of Reactors UCL
[%] 		Number of Reactors UCL
[%]
ARGENTINA 3 1.9 3 2.2 3 0.3 3 1.5
ARMENIA 1 7.4 1 1.1 1 3.0 1 3.9
BELARUS 2 2.2 2 8.6 2 4.5 2 5.6
BELGIUM 6 1.9 5 4.8 5 1.1 6 2.7
BRAZIL 2 4.9 2 2.3 2 0.9 2 2.7
BULGARIA 2 0.0 2 0.0 2 0.8 2 0.3
CANADA 19 1.6 19 4.6 17 2.1 19 2.8
CHINA 55 0.4 56 0.2 57 0.4 57 0.3
CZECH REPUBLIC 6 0.9 6 2.8 6 0.9 6 1.6
FINLAND 5 2.6 5 9.0 5 5.7 5 5.9
FRANCE 56 15.1 56 8.0 56 5.0 56 9.4
GERMANY 3 0.0 3 0.0
HUNGARY 4 1.2 4 1.2 4 0.8 4 1.1
INDIA 19 4.4 20 4.5 21 7.8 21 5.7
IRAN, ISLAMIC REPUBLIC OF 1 0.3 1 2.8 1 0.0 1 1.0
JAPAN 12 1.3 14 1.3 14 0.0 14 0.8
KOREA, REPUBLIC OF 25 2.1 26 2.2 26 2.5 26 2.2
MEXICO 2 1.5 2 2.6 2 14.2 2 6.1
NETHERLANDS, KINGDOM OF THE 1 3.6 1 6.0 1 2.3 1 4.0
PAKISTAN 6 3.3 6 2.7 6 5.3 6 3.8
ROMANIA 2 1.2 2 1.6 2 0.2 2 1.0
RUSSIA 37 3.3 37 2.8 36 1.9 37 2.7
SLOVAKIA 4 0.3 5 3.5 5 1.2 5 1.6
SLOVENIA 1 8.1 1 0.3 1 0.4 1 2.9
SOUTH AFRICA 2 4.8 2 2.2 2 9.3 2 5.4
SPAIN 7 2.3 7 3.6 7 3.6 7 3.2
SWEDEN 6 8.6 6 4.8 6 15.1 6 9.5
SWITZERLAND 4 0.6 4 1.7 4 18.5 4 7.0
UNITED ARAB EMIRATES 3 0.0 4 1.5 4 3.5 4 1.9
UNITED KINGDOM 9 8.0 9 13.1 9 20.9 9 14.0
UNITED STATES OF AMERICA 93 0.4 94 1.4 94 1.7 94 1.2
Total 401 3.9 404 3.2 402 3.1 411 3.4

The following information is included in the totals:

TAIWAN, CHINA 3 0.4 2 1.1 1 0.0 3 0.6


Above data generated by the PRIS database. Last update on 2026-07-17


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