― 62 ―
㻌 䠄䠍䠌䠅ཎᏊ⅔ቑಸᗘ䛚䜘䜃ไᚚᲬᛂᗘ䛾ヲ⣽ ᐃ㻌
㻌 㜰ᏛᏛ㝔ᕤᏛ◊✲⛉㻌 ⏣Ꮥ䚸➉⏣ᩄ㻌
㻌 ㏆␥ᏛཎᏊຊ◊✲ᡤ㻌 ᶫᮏ᠇࿃䚸ᕥ㏆ᩔኈ䚸ᇼཱྀဴ⏨㻌 㻌
䠍䚸 䛿䛨䜑䛻㻌 㻌
ᮏ◊✲䛾┠ⓗ䛿䚸ཎᏊ⅔䛾≉ᛶ ᐃ䛻䛚䛡䜛☜䛛䛥䜢ᐃ㔞䛩䜛䛣䛸䛷䛒䜛䚹ཎᏊ⅔䛾⮫⏺㏆
᥋ᐇ㦂䛻䛚䛡䜛」ᩘ䛾ᮍ⮫⏺ᗘⅬ䛻ᑐ䛩䜛ቑಸᗘ≧ែ䛚䜘䜃ไᚚᲬᰯṇᐇ㦂䛻䛚䛡䜛⢒ㄪᩚᲬ䛚 䜘䜃ᚤㄪᩚᲬ䛾⮫⏺䛾⨨䝕䞊䝍䜢」ᩘྲྀᚓ䛧䚸ཎᏊ⅔䛾ᮍ⮫⏺≧ែ䛚䜘䜃⮫⏺≧ែ䛻ᑐ䛩䜛
≉ᛶ䛾⌧ᛶ䛛䜙䚸☜䛛䛥䜢ᐃ㔞䛩䜛䜢ヨ䜏䛯䚹㻌 㻌
䠎䚸 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛡䜛ᮍ⮫⏺ᗘ㻌 㻌
㻌 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛔䛶䛿䚸」ᩘ䛾୰ᛶᏊ᳨ฟჾ䜢⏝䛔䜛䚹ᮏᐇ㦂䛷䛿㻮㻲㻟୰ᛶᏊィᩘ⟶䜢㯮㖄
ᑕయᮾ➃䛻㓄⨨䛧䛯㻝⣔⤫䚸ᖖタ䛾⿵ൾᆺ㟁㞳⟽䛚䜘䜃᰾ศィᩘ⟶䛾ィ㻟⣔⤫䛾᳨ฟჾ䜢⏝䛔 䛶ィ 䜢ᐇ䛧䛯䚹ᅗ㻝䛻䛿ཎᏊ⅔䛾ᵓ㐀䛚䜘䜃᳨ฟჾ䛾㓄⨨䜢♧䛩䚹㻌
㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌
ᅗ㻝㻌 ཎᏊ⅔䛾ᵓ㐀䛸୰ᛶᏊ᳨ฟჾ㓄⨨㻌 㻌
⮫⏺㏆᥋ᐇ㦂䛷䛿Ⲵ⇞ᩱయᩘ䜢ኚ᭦䛧䛺䛜䜙୰ᛶᏊィᩘ䛾ィ 䜢ᐇ䛩䜛䛜䚸ྠ䛨⇞ᩱయᩘ䛻ᑐ 䛧䛶ไᚚᲬᤄධ≧ែ䛸ไᚚᲬᘬᢤ䛝≧ែ䛾␗䛺䜛ᮍ⮫⏺≧ែ䛷ィ 䛩䜛䚹୰ᛶᏊ᳨ฟჾ㓄⨨䜢 ᅗ㻞䛻♧䛩䚹ᮏᐇ㦂䛷䛿⇞ᩱᯈ䛾ྲྀ䜚እ䛧䜎䛷䛿⾜䜟䛪䚸⇞ᩱయ༢䛷Ⲵ䛧䛯䚹㻌
㻌 㻌 㻌
Safety Rod 2 North Core Shim Rod
Source Hole
Regulating Rod South Core
Safety Rod 1
Rod Drive Mechanism A-Detector
B-Det ector
North South
West East
Horizontal View
46cm 16cm CdSheet
Neutron Source
70cm 33cm
Top
Bottom
Grap hite Grap hite
B-Det ect or
A-Detector
Vertical View
― 63 ―
㐠㌿␒ྕ㻜 㐠㌿␒ྕ㻝 㐠㌿␒ྕ㻞
㻺㻙㻢
㻺㻙㻡 㻿㻙㻡 㻺㻙㻡 㻿㻙㻡
㻺㻙㻠 㻿㻙㻠 㻺㻙㻠 㻿㻙㻠 㻺㻙㻠 㻿㻙㻠
㻺㻙㻟 㻿㻙㻟 㻺㻙㻟 㻿㻙㻟 㻺㻙㻟 㻿㻙㻟
㻺㻙㻞 㻿㻙㻞 㻺㻙㻞 㻿㻙㻞
㻿㻙㻝
㐠㌿␒ྕ㻟 㐠㌿␒ྕ㻠
㻺㻙㻢 㻺㻙㻢 㻿㻙㻢
㻺㻙㻡 㻿㻙㻡 㻺㻙㻡 㻿㻙㻡
㻺㻙㻠 㻿㻙㻠 㻺㻙㻠 㻿㻙㻠
㻺㻙㻟 㻿㻙㻟 㻺㻙㻟 㻿㻙㻟
㻺㻙㻞 㻿㻙㻞 㻺㻙㻞 㻿㻙㻞
㻺㻙㻝 㻿㻙㻝 㻺㻙㻝 㻿㻙㻝
ᅗ㻞㻌 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛡䜛⇞ᩱⲴ≧ែ㻔㐠㌿␒ྕ㻕㻌 㻌
ྛ᳨ฟჾ䛻䜘䜛ィ ್䜢⾲㻝䛻⧳䜑䛶♧䛩䚹㐠㌿␒ྕ㻠䛾ไᚚᲬᘬᢤ≧ែ䛻䛴䛔䛶䛿䚸ไᚚᲬ䜢
ᘬᢤ≧ែ䛻䛩䜛๓䛻ཎᏊ⅔䛜⮫⏺䛸䛺䜚୰ᛶᏊ※䜢ᘬ䛝ᢤ䛔䛯䛯䜑䚸ィ 䜢⾜䛳䛶䛔䛺䛔䚹⿵ൾᆺ㟁 㞳⟽䛾ィ ್䛿㐠㌿ྎ䛻䛚䛡䜛ฟຊィ㻔䝢䝁䜰䞁䝯䞊䝍䞊㻕䜘䜚䚸᰾ศィᩘ⟶䛚䜘䜃㻮㻲㻟ィᩘ⟶䛾ィ ್䛿㻝㻜㻜⛊㛫 ᐃ䜢⾜䛔ィᩘ⋡㼇㼏㼜㼟㼉䜢ồ䜑䛯䚹㻌
㻌
⾲㻝㻌 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛡䜛ྛ᳨ฟჾィ ್㻌
⿵ൾᆺ㟁㞳⟽㼇㻭㼉 ᰾ศィᩘ⟶㼇㼏㼜㼟㼉 㻮㻲㻟ィᩘ⟶㼇㼏㼜㼟㼉
ᤄධ 6.00E-12 18.10 164.49
ᘬᢤ 6.20E-12 16.48 218.28
ᤄධ 8.40E-12 22.3 367.47
ᘬᢤ 9.50E-12 23.95 524.75
ᤄධ 1.60E-11 47.04 858.32
ᘬᢤ 2.20E-11 57.39 1600.54
ᤄධ 3.10E-11 76.85 1377.34
ᘬᢤ 7.10E-11 161.62 4104.86
ᤄධ 5.20E-11 147.18 3982.92
ᘬᢤ --- --- ---
3 4
㐠㌿␒ྕ ไᚚᲬ⨨ ィ ್
0 1 2
㻌 㻌
⾲㻝䛻♧䛧䛯ィ ್䜢ඖ䛻䚸ቑಸᗘ䛾㏫ᩘ䠄㏫ቑಸᗘ䠅䜢ồ䜑䛯⤖ᯝ䜢⾲㻞䛚䜘䜃ᅗ㻟䛻♧䛩䚹㻌
― 64 ― 㻌
⾲㻞㻌 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛡䜛ྛ᳨ฟჾ䛾ቑಸᗘ䛾㏫ᩘ㻌
⿵ൾᆺ㟁㞳⟽㼇㻭㼉 ᰾ศィᩘ⟶㼇㼏㼜㼟㼉 㻮㻲㻟ィᩘ⟶㼇㼏㼜㼟㼉
ᤄධ 1.000 1.000 1.000
ᘬᢤ 1.000 1.000 1.000
ᤄධ 0.714 0.812 0.448
ᘬᢤ 0.653 0.688 0.416
ᤄධ 0.375 0.385 0.192
ᘬᢤ 0.282 0.287 0.136
ᤄධ 0.194 0.236 0.119
ᘬᢤ 0.087 0.102 0.053
ᤄධ 0.115 0.123 0.041
ᘬᢤ --- --- ---
4 1 2 3
㐠㌿␒ྕ ไᚚᲬ⨨ ቑಸᗘ䛾㏫ᩘ
0
㻌 㻌
0 0.2 0.4 0.6 0.8 1 1.2
1500 2000 2500 3000 3500
㏫㏫ቑಸᗘ
U235㉁㉁㔞[g]
ᤄධ ⿵ൾᆺ㟁㞳⟽[A]
ᤄධ ᰾ศィᩘ⟶[cps]
ᤄධBF3ィᩘ⟶[cps]
ᘬᢤ ⿵ൾᆺ㟁㞳⟽[A]
ᘬᢤ ᰾ศィᩘ⟶[cps]
ᘬᢤBF3ィᩘ⟶[cps]
㻌 ᅗ㻟㻌 ⮫⏺㏆᥋ᐇ㦂䛻䛚䛡䜛ྛ᳨ฟჾ䛾㏫ቑಸ⋡᭤⥺㻌
㻌
௨ୖ䛾ィ ⤖ᯝ䛻䛴䛔䛶䛿䚸ḟᖺᗘ௨㝆䜒ྠ䛨㐠㌿≧ែ䛚䜘䜃ไᚚᲬᤄධ≧ែ䛷䛾ィ 䜢⥅⥆䛧䛶 ᐇ䛩䜛䛣䛸䛻䜘䜚䚸ᮍ⮫⏺≧ែ䛾⌧ᛶ䛚䜘䜃ᮍ⮫⏺≧ែ䛾☜䛛䛥䛾☜ㄆ䜢⾜䛖ணᐃ䛷䛒䜛䚹㻌 㻌
㻌
― 65 ― 䠏䚸 ไᚚᲬᰯṇᐇ㦂䛻䛚䛡䜛⮫⏺Ⅼ㻌
㻌
㻌 ไᚚᲬᰯṇᐇ㦂䛻䛚䛔䛶䛿䚸䝨䝸䜸䝗ἲ䛚䜘䜃ⴠୗἲ䜢ᐇ䛩䜛๓䛾⮫⏺Ⅼ䜢⾲㻟䛻♧䛩䚹㻌 㻌
⾲㻟㻌 ไᚚᲬᰯṇᐇ㦂䛻䛚䛡䜛⮫⏺Ⅼ㻌 ไᚚᲬ⨨
䝅䝮ᏳᲬ 81%
ㄪᩚᲬ 0% 㻌 㻌
ୖグ䛾⮫⏺Ⅼ䛻䛴䛔䛶䛿䚸ḟᖺᗘ௨㝆䜒ྠ䛨㐠㌿≧ែ䛚䜘䜃ไᚚᲬᤄධ≧ែ䛷䛾ィ 䜢⥅⥆䛧䛶ᐇ
䛩䜛䛣䛸䛻䜘䜚䚸⮫⏺≧ែ䛾⌧ᛶ䛚䜘䜃⮫⏺≧ែ䛾☜䛛䛥䛾☜ㄆ䜢⾜䛖ணᐃ䛷䛒䜛䚹㻌
䠐䚸 ᐇ㦂⤖ᯝ䛸⪃ᐹ㻌 㻌
㻌 ᮍ⮫⏺≧ែ䛾⌧ᛶ䛚䜘䜃ᮍ⮫⏺≧ែ䛾☜䛛䛥䛻㛵䛧䛶䚸᳨ฟჾ䛻䜘䜛ィᩘ䛾☜䛛䛥䛰䛡䛷䛺 䛟䚸᳨ฟჾ㓄⨨䛾⌧ᛶ䛻☜䛛䛥䛜క䛖䛣䛸䛜⪃䛘䜙䜜䜛䚹⮫⏺Ⅼ䛻䛚䛡䜛ไᚚᲬ⨨䛾⌧ᛶ䛿䚸
⨨ᣦ♧䛾᭷ຠ᱆䛚䜘䜃ᑬᗘ䛾䛝䛥䜒㋃䜎䛘䛶䚸☜䛛䛥䜢᳨ウ䛩䜛ᚲせ䛜䛒䜛䛸⪃䛘䜙䜜䜛䚹௨ୖ
䛾ィ ⤖ᯝ䛻䛴䛔䛶䛿䚸ḟᖺᗘ௨㝆䜒ྠ䛨㐠㌿≧ែ䛚䜘䜃ไᚚᲬᤄධ≧ែ䛷䛾ィ 䜢⥅⥆䛧䛶ᐇ
䛩䜛䛣䛸䛻䜘䜚䚸ᮍ⮫⏺≧ែ䛚䜘䜃⮫⏺≧ែ䛷䛾⌧ᛶ䛚䜘䜃☜䛛䛥䛾☜ㄆ䜢⾜䛖ணᐃ䛷䛒䜛䚹㻌 㻌
㻌
ᐇ㦂䞉 ᐃ⿵ຓ⪅䠖䛺䛧㻌 㻌
