Calculating source terms of pressure water reactor (PWR) that are time-related and of a lot of isotopes and their intensity.

计算压水堆与时间相关的、大量同位素的源项及其强度。

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The utility model relates to the field of nuclear fuel components, in particular to an upper tube seat of a pressure water reactor fuel element.

本实用新型涉及核燃料元件领域，具体涉及一种压水堆燃料组件上管座。

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Meanwhile, the four corners are respectively and symmetrically provided with positioning pin holes, so that the assembly of the pressure water reactor fuel element can be more flexible and convenient.

同时，在四角位置分别对称布置定位销孔，从而使压水 堆燃料组件的安装更加灵活方便。

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Because this was a reactor that operated on water that was already at its boiling point, this also meant that the pressure inside the reactor was rising as well.

FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi

The telltale sign of trouble at reactor No. 2, Tokyo Electric Power Co. officials said, was that pressure had dropped in the "suppression pool" the part of the reactor that converts steam to water at the bottom of the container.

WSJ: Japan's Nuclear Crisis Escalates