Các thông số cơ bản cho các nhóm neutron trong lò phản ứng (Khóa luận tốt nghiệp)

c

iii


.....................................................................................................................1
:
......................................................................................3
1.1 S

..............................................................3
............................................................................4
.........................................................................11
.............................................................12
..............................14
.............................................................................................................15
..................................................................................................16
:

..........................19
..........................................................................19
....................................................................24

2.2.1

.................................................................................24

2.2.2

....................................................29

2.2.3

..................................................................................34
......................38

2.3.1

................................................................41
:

..45
........................................................................................45
.....................................................................................45
.......................................................................................49

:

....................................58
....................59
.....................................................59

iv


....................................66
...............................................................................67
...............................................................................................71
...........................................................................72
.........................................................................................74
...............................................................................................................76

....................................................................................................................77
....................................................................................................................79
.........................................................................................84

v


.............................................................4
....................................................................5
....................................................................6
.................................7
.......................................................................10
.....11
........................................................16
...........................................................................17
.....................................24
H

...................................................28
...............................................................29
...........................................31
..............................................................35
.......................................44
nh 3.1

.........................................................................................52
...............................................56
..........................................64
0

................................................82

0

vi


.1
........................5
.
(Blachot 1990)....................................................................................................8
.

................................................................9
.......................................................32
..........................................................................................33
..........................................................77

vii


-

a)

trong
.

1

b)

,
ian dt.
c)

barn (1b=10-24 cm2
.
.

2


1.1

sau:

p

d

3


p

1.1.1

d

sinh ra neutron

(

-14

(1.1)

(1.2)

E

1

4


238

1.2 MeV. S
.
.1.
a
(MeV)

233

235

2.482

0.075

2.410

0.136

2.432

0.065

2.349

0.150

2.304

0.160

2.867

0.148

2.907

0.133

U
E>1

U

238

U

239

Pu
a)

b

:

2
5

E>1

E>1


cho

sau:

(1.3)
235

1966):
(1.4)

235

3P

U

(1.5)

(1.6)
6


b)

1.4.

4C
Z-1X

A

ZX

A
Z-

1X

A
A
ZX :

(1.7)

7


(1.8)

2
.2
(Blachot 1990)

233

U

0.00667

235

0.0068

239

0.0023

U
Pu

241

0.0154

0.0052

238

0.043-0.047

0.0158

Pu
U*

*

t

0.0027

(Keeplin 1965).

8

B

1.3

(IAEA 2014)
g trung

(i)

(%)
(MeV)
235
87

1

Br, 142Cs

137

2

138

3

I, 88Br

I, 89Br,

(93,94)

Rb

239

U

Pu

233

235

U

U

239

Pu

233

U

0.25

55.72

54.28

55.0

0.021 0.0072 0.0226

0.56

22.72

23.4

20.57

0.142 0.0626 0.0786

0.43

6.22

5.60

5.00

0.127 0.0444 0.0658

0.62

2.3

2.13

2.13

0.257 0.0685 0.0730

0.42

0.61

0.618

0.615

0.075

-

0.23

0.257

0.277

0.027 0.0093 0.0087

139

I,
(93,04)

Kr,
143
Xe,
(90,92)
Br

4

140

I, 145Cs

5

(Br, Rb,

6

0.65
*

d

-VI).

di

9

0.018

0.21

0.0135

0.26


)

5P
i
i

iCi

(1.9)
c)

(1.10)

10


(1.11)

(1.12)
hay
(1.13)
(1.14)

1.1.2

:
(1.15)

6

(1.16)

11


(1.17)

(1.18)
hay:
(1.19)
t

(1.20)
(1.21)

(1.22)
1.1.

(1.23)
12


1 (Bell

1970)

(1.24)

(1.25)
1

theo

(1.7),
:

(1.26)
:

(1.27)
V
:
(1.28)

13


(1.29)
:

1.2

a)

i

(1.30)
b)

(1.31)

(1.32)
inh ra

(1.33)

14


1.3

(1.34)

(1.35)

(1.36)

(1.37)

(1.38)

15

1.4
34

a)
:
(1.39)

b)

(1.40)
ta
(1.41)

7

c)
16


.
s

8.

.

sau:
(1.42)
P1
(1.43)

8

(1.44)
albedo

Trong t

17


(1.45)

albedo
1.45

18


-

2.1

(2.1)

external

=0)

(2.2)

(2.3)

(2.4)

19


(2.5)

(2.6)

(2.7)

(2.8)

(2.9)

(2.10)

20