Access Restriction

Author Cheverton, R. D.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Reactivity Associated ♦ Island Region ♦ Void Coefficient ♦ Maximum Change ♦ Addi Ional Material ♦ Cor-responding Void Rac Ion ♦ Mater Ia L ♦ Associated Decrease ♦ Land Void ♦ Neutron Multiplication ♦ Specif Ied ♦ Mult Ipl Icat Ion ♦ Land Resul ♦ Rge Change ♦ Use Af Beryllium ♦ Corresponding Void Rac Ion
Abstract Changes i n neutron multiplication caused by voids i n the i s land of the HFIR have been calculated and measured experimentally. The r e su l t s indicate t h a t with only water i n i t i a l l y i n the i s land the maximum change i n neutron mult ipl icat ion (%ax) associated with is land voids i s 0.032 with a corresponding void f rac t ion of 70%. W i t h a simulated 300 g Pu t a rge t i n the i s land was 0.016, and the cor-responding void f rac t ion was 42%. In view of these la rge changes i n neutron multiplication, calcal-l a t i ons were made t o determine what addi t ional materials could be used i n the is land t o reduce mmaX and what the associated decrease i n peak t h e m 1 f lux would be. The r e s u l t s indicated t ha t of the mater ia ls considered the use af beryllium i n the water i s land resul ted i n the smallest decrease i n f l u x f o r a specif ied m,,. To reduce BmaX t o 0.01 required 26 % by volume of beryllium i n the island; the corre-
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study