大核唔應該有氚排出嚟

港核投指大亞灣核電廠排放「氚」屬正常程序

如果大亞灣係同福島第一原發一樣,係用沸水式(Boiling Water Reactor)嘅話,比較少出現氚嘅機會,因為冷卻劑中唔含硼砂作為中子捕獲劑,產生少好多氚,但如果都係發現各類放射同位素,即係成個過濾程序不當要停機。因為Boiling Water Reactor用嚟冷卻嘅水,同埋用嚟製造蒸汽嘅水,係同一堆水嚟,咁既然水係流過反應堆,就難免有一啲核反應嘅殘餘物,咁係要小心處理。

但依家大亞灣係用壓水式(Pressurized Water Reactor),加咗七十個大氣壓同硼砂嘅冷卻水,同用嚟推動發電機嘅蒸汽用水,係兩個唔同迴路嚟。依家唯一解釋係,大亞灣曾經排出過用嚟冷卻反應堆嘅水,點解要排出冷卻反應堆嘅水先?呢個關鍵問題到依家無人答我喎。

以下論文,可以俾大家判斷一下,大亞灣有乜問題

Radioactive Rivers and Rain: Routine Releases of Tritiated Water From Nuclear Power Plants

Tritium is also produced, in greater quantities, in the fuel rods of both PWRs and BWRs from ternary fission12 (fission in which there are three fission fragments). Only a tiny fraction of this leaks into the primary cooling water along with some other fission products through very small cracks and holes that form in a small number of the fuel rods.13 The PWR’s cooling water is constantly taken out for chemical treatment, volume control, and to reduce the radioactivity. Then most of it is sent back into the reactor vessel. The chemical treatment is mainly to reduce the amount of boron as the reactivity in the fuel decreases with time.14 Some of the fission products that leak into the primary water of the reactor are removed by passing the water through ion exchange resins; however, this does not affect tritiated water which, being chemically identical to water, just passes right through.15 The part of the cooling water which is not returned to the reactor vessel is put in holding tanks. It is periodically released to the environment
after further treatment and dilution to bring the tritium concentration to a level deemed “safe” by the nuclear industry and the NR C. Fresh water is mixed in with the balance of the primary water to make up for the water that is withdrawn into the holding tanks.

但我覺得,大亞灣班友,不盡不實嘅多。

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Filed under 科學, 香港政治, 中國政治

One response to “大核唔應該有氚排出嚟

  1. 按你quote的文﹕「The part of the cooling water which is not returned to the reactor vessel is put in holding tanks. It is periodically released to the environment after further treatment and dilution to bring the tritium concentration to a level deemed “safe” by the nuclear industry and the NRC.」

    個問題係點解有d水係唔返去反應堆﹖為左定期換水﹖

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