屏蔽估算保守性对工程投资的经济性分析

The Economical Efficiency Analyze for Radiate Shielding Calculation Conservative Property to Engineering Investment

针对核技术利用设施,在设施屏蔽设计目标值确定的条件下,利用1/10值层法、查表法、点核积分法和MCNP程序对单一无限大屏蔽介质的厚度进行设计,分析各种屏蔽估算的保守性及其对工程投资的经济性进行分析。对于简单的核技术利用设施优先采用点核积分法进行设计,对于复杂的核技术利用设施优先采用MCNP程序进行设计。通过对设计结果与屏蔽介质的实际厚度对比得知,上述4种方法均存在一定的保守性,会不同程度地增加设施的工程投资。其中1/10值层法增加土建工程投资高达30%以上,查表法可控制在10%左右,点核积分法可控制在10%以下,MCNP程序可控制在5%以下。

Under the condition of defining designed target shield value , tenth attenuation method , check table method, QAD and MCNP were used to design the thickness of single infinite shield medium for nuclear technol -ogy utility facilities .Moreover , the conservative property and applicability of each method and the economical efficiency for engineering investment were analyzed .Priority was given to QAD for designing a simple nuclear technology utility facility;MCNP was recommended to design a complicated facility .By comparing the designed thickness and actual thickness of shield medium , it is found that each method incorporated conservative property in certain level .The conservative nature of these methods may raise the project investment for constructing a fa -cility：tenth attenuation method can cause more than 30%increase in the shielding , while the number for check table method , QAD and MCNP were around 10%, below 10%and 5%respectively .