核電站從核裂(lie)(lie)變時產(chan)生的熱量中產(chan)生蒸汽(qi)，核裂(lie)(lie)變是一個原子(zi)分裂(lie)(lie)并(bing)釋放能(neng)量的過(guo)程(cheng)。蒸汽(qi)被用來驅動(dong)大型渦輪機和發電。在(zai)反應堆的中心，矗立著包含鈾燃料(liao)的核子(zi)。換句話說，核電站是一個熱電廠，其(qi)中的熱源是核燃料(liao)。

核電(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)的(de)電(dian)(dian)(dian)(dian)(dian)力系(xi)統(tong)(tong)(tong)(tong)設(she)計取決于網絡(luo)、電(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)的(de)系(xi)統(tong)(tong)(tong)(tong)設(she)計和工程設(she)計。盡管有多種設(she)計可能性，任何(he)核電(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)都(dou)是基(ji)于三(san)個(ge)電(dian)(dian)(dian)(dian)(dian)氣系(xi)統(tong)(tong)(tong)(tong)：主(zhu)系(xi)統(tong)(tong)(tong)(tong)、內部(bu)電(dian)(dian)(dian)(dian)(dian)氣系(xi)統(tong)(tong)(tong)(tong)和外(wai)部(bu)電(dian)(dian)(dian)(dian)(dian)氣系(xi)統(tong)(tong)(tong)(tong)。

外部(bu)電(dian)氣系(xi)統由(you)變電(dian)站組成，電(dian)站將(jiang)產生的電(dian)力輸送到變電(dian)站，并轉(zhuan)換至配電(dian)或運輸網(wang)絡。

主系統包括發(fa)電機和與之相關(guan)的升壓變(bian)壓器(qi)(qi)，以及(ji)連接系統（相線）和保護裝置（發(fa)電機開關(guan)、保護繼(ji)電器(qi)(qi)、測量變(bian)壓器(qi)(qi)…）。

內(nei)部電(dian)氣系(xi)(xi)統包括主系(xi)(xi)統正確運行所需的所有輔(fu)助子(zi)系(xi)(xi)統 – 通過輔(fu)助變(bian)壓(ya)器與(yu)之相連?– 如(ru)潤滑和(he)(he)冷(leng)卻泵，以及(ji)所有的保(bao)護(hu)和(he)(he)控制設備、UPS和(he)(he)直流系(xi)(xi)統、應急電(dian)源系(xi)(xi)統，如(ru)柴油發電(dian)機(ji)……當(dang)然還(huan)有相應的保(bao)護(hu)和(he)(he)控制設備，保(bao)證每個子(zi)系(xi)(xi)統的正確運行。內(nei)部系(xi)(xi)統可能非(fei)常復(fu)雜，正確的設計(ji)對于確保(bao)主系(xi)(xi)統的正常運行和(he)(he)整個電(dian)站的安全至關(guan)重要。