安(an)全(quan)(quan)評(ping)(ping)(ping)價包括危(wei)險(xian)(xian)(xian)性(xing)(xing)確(que)認(ren)(ren)和(he)危(wei)險(xian)(xian)(xian)性(xing)(xing)評(ping)(ping)(ping)價兩(liang)部分(fen)。為(wei)了評(ping)(ping)(ping)價比較(jiao),對于危(wei)險(xian)(xian)(xian)性(xing)(xing)的(de)大小(xiao)要(yao)盡量給出定量的(de)概念,即(ji)使是(shi)(shi)定性(xing)(xing)的(de)安(an)全(quan)(quan)評(ping)(ping)(ping)價,如能大致區別一(yi)下危(wei)險(xian)(xian)(xian)性(xing)(xing)的(de)嚴重度(損害程度)也(ye)是(shi)(shi)好的(de)。當(dang)然,要(yao)能夠明確(que)事(shi)故發生概率(lv)的(de)大小(xiao)及損失的(de)嚴重度,也(ye)就是(shi)(shi)明確(que)了風險(xian)(xian)(xian)率(lv)或危(wei)險(xian)(xian)(xian)度,則進行(xing)定量安(an)全(quan)(quan)評(ping)(ping)(ping)價就更為(wei)明確(que)了。危(wei)險(xian)(xian)(xian)性(xing)(xing)確(que)認(ren)(ren)的(de)另一(yi)個方面就是(shi)(shi)要(yao)對危(wei)險(xian)(xian)(xian)進行(xing)反(fan)復(fu)校(xiao)核,看看還(huan)有(you)什(shen)么新的(de)危(wei)險(xian)(xian)(xian)以(yi)(yi)及在(zai)系統運行(xing)過程中危(wei)險(xian)(xian)(xian)性(xing)(xing)會有(you)什(shen)么變化。為(wei)了衡量危(wei)險(xian)(xian)(xian)性(xing)(xing),需要(yao)一(yi)個標準,這就是(shi)(shi)大家所公認(ren)(ren)的(de)安(an)全(quan)(quan)指(zhi)標。把(ba)反(fan)復(fu)校(xiao)驗過的(de)危(wei)險(xian)(xian)(xian)性(xing)(xing)定量結果和(he)安(an)全(quan)(quan)指(zhi)標( 評(ping)(ping)(ping)價標準) 進行(xing)比較(jiao),界(jie)線(xian)值(zhi)以(yi)(yi)內即(ji)認(ren)(ren)為(wei)是(shi)(shi)安(an)全(quan)(quan)的(de),界(jie)線(xian)值(zhi)以(yi)(yi)外必須采(cai)取措施,然后根據(ju)反(fan)饋信(xin)息進行(xing)再評(ping)(ping)(ping)價。