二に酸さん化かウラン

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Meanings

1

noun

uranium dioxide

Technical term for the chemical compound UO₂, used as nuclear fuel.

two, two radical (no. 7)

酸acid, bitterness, sour

化change, take the form of, influence

ウラン
Refers to the element uranium in general, while 二酸化ウラン specifically means uranium dioxide.
酸さん化かウラン
A broader term for uranium oxides; 二酸化ウラン is the dioxide form.

Compound of 二酸化 (dioxide) and ウラン (uranium), a straightforward calque from English 'uranium dioxide'.