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Japan Atomic Energy Research Institute

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(T319-H95

This report is issued irregularly.Inquiries about availability of the reports should be addressed to Research

Information Division, Department of Intellectual Resources, Japan Atomic EnergyResearch Institute, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.

© Japan Atomic Energy Research Institute, 2001

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Study on Residual Radioactive Inventory Estimation

in Reactor Decommissioning Program

(Contract Research)

Takenori SUKEGAWA, Mutsuo HATAKEYAMA+ and Satoshi YANAGIHARA

Department of Decommissioning and Waste Management

Tokai Research Establishment

Japan Atomic Energy Research Institute

Tokai-mura, Naka-gun, Ibaraki-ken

(Received July 18, 2001)

In general, neutron transport and activation calculation codes are

used for residual radioactive inventory estimation; however, it is

essential to verify calculations by measurement results because of

geometrical complexity of the reactor and so on. A methodological

study was made on radioactive inventory estimation in a reactor to be

decommissioned. The comparison between measured and calculated

radioactivity in the JPDR core components showed a relatively good

agreement (factor of 2), and it was cleared that water content and

weight ratio of steel bars to concrete materials significantly

influenced the neutron flux distribution in the biological shield

(factor of 2-10 error). The measured radioactivity inside of the

reactor pressure vessel wall and at the inner part of the biological

shield was compared in detail with the calculations to verify the

methodology applied to calculations of radioisotope production. Then

it was found that the radioactive inventory could be estimated

accurately with combination of calculations and measurement of

radioactivity in samples and dose rate distribution for planning of

dismantling activities.

Keywords : Reactor Decommissioning, JPDR, Radioactive Inventory,

Neutron Activation, Core Internal, Reactor Pressure Vessel, Biological

Shield Concrete, Neutron Transport Calculation, ORIGEN, Thermal Neutron

Flux, Measurement of Radioactivity, Dose Rate, Chemical Analysis,

Radioactive Waste,

This study was conducted under contract with Science and Technology Agency of Japan

from 1996 to 2000.+ Office of Operational Safety Administration

JAERI-Tech 2001-058

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JAERI-Tech 2001-058

Contents

1. Introduction 1

2. Technology for Estimation of Radioactive Inventory 2

2.1 Outline of Technology for Estimation of Radioactive Inventory 2

2.2 Outline of Reference Reactor 2

3. Calculation Method 2

3.1 Calculation Flow 2

3.2 Neutron Flux Calculation 2

3.3 Radioactivity Calculation 4

4. Measurement 5

4.1 Measurement Method 5

4.2 Dose Rate Measurement 5

4.3 Sampling before Reactor Dismantling 6

4.4 Sampling during and after Reactor Dismantling 7

4.5 Method of Radio-nuclide Analysis 7

5. Results 8

5.1 Calculation 8

5.2 Measurement 9

6. Discussion 11

6.1 Comparison between Calculated Value and Measured Value 11

6.2 Discussion on Discrepancies of Calculated Results 12

6.3 Discussion on Procedure for Radioactive Inventory Evaluation 14

7. Concluding Remarks 15

Acknowledgement 16

References 17

Appendix I Outline of Major Components 41

Appendix II Manufacturing Dose Rate Measuring Devices and Sampling Devices for

Reactor Components 50

AppendixM Measurement Results of Dose Rate and Radioactivity 54

AppendixIV Chemical Analysis 66

Appendix V Parametric Calculation for Radioactive Inventory Evaluation 68

AppendixVI Application of Radioactive Inventory Data for a Reactor Dismantling Project 80

JAERI-Tech 2001-058

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JAERI-Tech 2001-058

Table and Figures Captions

Table 1 Major Specification of Reactor

Table 2 Energy Group Structures of 48 Groups Library

Table 3 Atomic Number Density for the Materials in Reactor

Table 4 Nuclide Contents of Structural Materials and Impurity Elements (w%)

Table 5 Operational History

Table 6 Radioactive Inventory in Neutron-Activated Components

Table 7 Measured Radioactivity in Major Components (Direct Measurement)

Table 8 Measured Radioactivity in Major Components (Chemical Analysis)

Fig.l Schematic View of Reactor Enclosure Building

Fig.2 Reactor Core and Fuel Assembly

Fig.3 Reactor Pressure Vessel and Core Internals

Fig.4 Flow Diagram of Radioactive Inventory Calculation Code System

Fig.5 One-dimensional Model for ANISN Calculations (Vertical and Horizontal Plane)

Fig.6 Two-dimensional Model of Middle Part of Reactor for DOT3.5 Calculations

Fig.7 Simplified Operational History

Fig.8 Schematic View of Reactor and Sampling Positions

Fig.9 Thermal Neutron Flux Contour

Fig. 10 Radial Flux Distribution at Core Midplane

Fig.ll Discrepancies between Calculation and Measurement of Radioactivity in Reactor Components

Fig. 12 Vertical Radioactivity Distribution at Inner Surface of Core Shroud and Reactor Pressure Vessel

Fig. 13 Radioactivity Distribution in Reactor Pressure Vessel Wall

Fig. 14 Discrepancies between Calculation and Measurement of Radioactivity in Biological Shield

Fig. 15 Horizontal 60Co Activity Distribution in Biological Shield (Core A —C)

Fig. 16 Horizontal 60Co Activity Distribution in Biological Shield (Core D —F)

Fig. 17 Horizontal Radioactivity Distribution of Gamma-emitter Nuclides in Biological Shield (Core D)

Fig.18 Radioactivity Distribution in Biological Shield Liner

Fig. 19 Vertical Radioactivity Distribution at Inner Surface of Biological Shield

Fig.20 Detail Flux Calculation around Control Rod

Fig.21 Relation between Water Content and Thermal Neutron Flux Distribution in Concrete Biological

Shield

Fig.22 Neutron Flux Distributions Calculated Changing Weight Ratio of Steel Bars in the Inner Layer of

Biological Shield

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(2) rty?X>\*mffl:m¥P!m^m%imt^&-JFDR<Dmfc£&ffiM%-, JAERI-Tech

97-001(1997)

(3) Engle Jr.,W. W. : A User's Manual for ANISN, A One-Dimensional Discrete Ordinates Transport Code

With Anisotropic Scattering, K-1693(1967)

(4) Mynatt, F. R. et al. : The DOT-m Two-Dimensional Discrete Ordinates Transport Code, ORNL-TM-

4280(1973)

(5) Bell, M. J.: ORIGEN - The ORNL Isotope Generation and Depletion Code, ORNL4628(1973)

(6) PSR-63/AMPX-II Document Package : AMPX-II : Modular Code System for Generating Coupled

Multigroup Neutron-Gamma-Ray Cross-Section Libraries from Data in ENDF Format, ORNL

(7) DLC-41/VITAMIN-C DATA PACKAGE : VTTAMIN-C : 171 Neutron, 36 Gamma-Ray Group Cross

Sections in AMPX and CCCC Interface Formats for Fusion and LMFBR Neutronics, ORNL

(8) Naito, Y. et al. : MGCL-PROCESSOR : A Computer Code System for Processing Multigroup Constants

Library MGCL, JAERI-M 9396(1981)

(9) /hlililn, ffi : ffiBfflft(Dffi8fc, JAERI-M 6928(1977)

(10) Delp, D. L. et al.: FLARE - A Three-Dimensional Boiling Water Reactor Simulator, GEAP-4598(1964)

(11) Watt, B. E.: Phys. Rev., 87,1037(1952)

(12) J. C. Evans et al.: Long-Lived Activation Products in Reactor Materials, NUREG/CR-3474(1984)

(13) GE: APED3998 JPDR Final Design Report(1962)

(14) JPDR JEE^&ggffrnr tW"!^ ON«fiE±, ffi) : W]tjMMfc'}Pl±.tl^%s(DW, 2

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JAERI-Tech 2001-058

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JAERI-Tech 2001-058

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JAERI-Tech 2001-058

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- 7 3 -

JAERI-Tech 2001-058

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- 7 4 -

JAERI-Tech 2001-058

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- 7 5 -

JAERI-Tech 2001-058

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0.9894.124E+102.780E+105.392E+09

1.0113.686E+102.702E+106.722E+09

1.0183.338E+102.648E+108.370E+09

1.0229.338E+091.588E+102.646E+10

1.0301.777E+042.422E+041.272E+05

0.7541.080E-011.497E-017.854E-01

0.756

- 7 6 -

JAERI-Tech 2001-058

!V-2(3-2)

(cm)

0.0

63.2

70.0

79.7

89.0

104.1

110.0

111.0

116.5

135.6

145.0

281.0

411.0

m H *

m,

*

3 ^ ^7 U — b1

13 ^/ ' J'—* S

60 03.763E+133.388E+131.681E+13

1.0062.338E+131.801E+131.143E+13

1.0035.286E+126.022E+123.069E+13

0.9671.301E+121.112E+122.786E+12

0.9172.695E+112.266E+111.509E+12

0.8877.120E+104.576E+104.339E+10

0.9224.707E+102.935E+104.338E+09

0.9944.123E+102.779E+105.382E+09

1.0093.686E+102.700E+106.694E+09

1.0133.338E+102.646E+108.324E+09

1.0169.339E+091.588E+102.638E+10

1.0271.777E+042.422E+041.452E+05

0.8611.080E-011.497E-018.958E-01

0.862

75 03.763E+133.388E+131.674E+13

1.0022.338E+131.801E+131.143E+13

1.0035.286E+126.022E+123.143E+13

0.9901.301E+121.112E+122.934E+12

0.9662.695E+112.266E+111.616E+12

0.9497.120E+104.577E+104.533E+10

0.9634.708E+102.935E+104.349E+09

0.9974.124E+102.779E+105.359E+O9

1.0053.686E+102.701E+106.650E+09

1.0073.339E+102.647E+108.256E+09

1.0089.340E+091.588E+102.605E+10

1.0141.777E+042.422E+041.573E+05

0.9321.080E-011.497E-019.701E-01

0.934

90 03.763E+13

' 3.388E+131.671E+13

1.0002.338E+131.801E+131.141E+13

1.0015.286E+126.022E+123.169E+13

0.9981.301E+121.112E+123.017E+12

0.9932.695E+112.265E+111.682E+12

0.9887.121E+104.580E+104.669E+10

0.9924.710E+102.939E+104.369E+09

1.0024.126E+102.783E+105.342E+09

1.0013.688E+102.704E+106.619E+09

1.0023.340E+102.650E+108.208E+09

1.0029.343E+091.590E+102.577E+10

1.0031.778E+042.423E+041.659E+05

0.9831.080E-011.497E-011.022E+00

0.984

96 03.763E+133.388E+131.671E+13

1.0002.338E+131.801E+131.140E+13

1.0005.286E+126.022E+123.174E+13

1.0001.301E+121.113E+123.037E+12

1.0002.695E+112.265E+111.702E+12

1.0007.121E+104.578E+104.708E+10

1.0004.709E+102.936E+104.362E+09

1.0004.125E+102.781E+105.334E+09

1.0003.687E+102.702E+106.606E+09

1.0003.340E+102.648E+108.189E+09

1.0009.342E+091.589E+102.569E+10

1.0001.778E+042.422E+041.687E+05

1.0001.080E-011.497E-011.039E+00

1.000

- 7 7 -

JAERI-Tech 2001-058

tv-3 ANISN

48 S¥

bfc48 S¥

DB-Hif

ilb

89m

CPU(*)

2.92

7.35

11.77

12.83

2.72

9.00

11.22

12.27

0.83

6.35

16.48

31.20

45.20

58.27

70.64

82.32

87.35-

11.87

OUTER

5

15

30

35

5

15

30

35

1

5

15

30

45

60

75

90

96

36

INNER(0)

2722

6915

10251

10802

2721

6943

10270

10822

877

4395

10929

19428

26893

33138

38390

42783

44686

10773

NEUTJBAL

1.0000105

1.0000105

1.0000095

1.0000124

1.0000143

1.0000134

1.0000124

1.0000143

1.0000191

1.0000095

1.0000076

1.0000086

1.0000076

1.0000067

1.0000076

1.0000076

1.0000086

1.0000095

UPSCATTERRATIO

1.0419760

1.0051031

1.0003405

1.0001488

1.0427408

1.0051546

1.0003414

1.0001478

0.0

1.0195398

1.0037527

1.0014753

1.0006189

1.0002699

1.0001183

1.0000601

1.0000362

1.0001421

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.000

1.0158014

1.0032320

1.0002422

1.0001030

1.0158663

1.0032368

1.0002365

1.0001020

0.0

1.0505123

1.0099592

1.0054998

1.0026741

1.0012674

1.0005798

1.0002489

1.0001841

1.0000696

"" (**)

0.468

0.859

0.993

1.000

0.468

0.860

0.993

1.000

-

0.310

0.491

0.698

0.834

0.917

0.966

0.993

1.000

-

ANISNEPS = 1.0X10"" : epsilon - accuracy desiredRYF =0.5 : A 2 relaxation factor, normally 0.5XLAL = 1.0 X 10~4: point flux convergence criterion if entered

greater than zero

1.00

- 7 8 -

JAERI-Tech 2001-058

1.2

1.0

0-8

0.6

•fr8 0.4

0.2

0.020 40 60 80 100

JV-4

1.0E+09

1.0E+08

o<Dtl)

CM

E 1.0E+07

| j 1.OE+06

1.0E+05

1.0E+04

**" \v • .

\ : : : : : : :

\ . : : : : . :: y'.'.'.'.

o

>

x

1

- • DOT3.5 I- M O R S E [I

^ : ^ v _ : : : : : . . - : : : : : :

• ' • • ' :

1.0E+07

1 .OE+06

1.0E+03

1.OE+0250 100 150 200 250

- 7 9 -

JAERI-Tech 2001-058

CR)

40cm

lm

40cm

FCD-37 m

PL, PC ^ r ; CR

A,

JPDR m

, 6 mm (A, B, C, PL, PQ

-5

(LXWXH)Gum) Gum) fton)

(m3)(Ba)

(MSv/h)

lm1,370 X,370

X 1,382330 15.0 0.36 93T 160 70

B1,370X1,370

X 1,382 235 13.4 0.73 5.6T 140 70

1,370X1,370X 1,250

70 4.7 1.33 22G 100 60

PL 1,050X1,050X 2,728

375 17.7 0.18 28T 260 70

PC1,060X1,060

X 2,633325 17.0 0.34 4.8T 300 70

CR1,060X1,060

X 2,593305 16.4 0.40 umm 2.4T 500 80

- 8 0 -

JAERI-Tech 2001-058

t l O

0 0 . 5 1 . 0 1 - 5 2 - 0 2 . 5 3 . 0 3 - S 4 - 0

a 4.0 +

1.0

RRDtf iL DISrBNCE (CH)

-mm.

- 8 1 -

(SI) t

ftK

Mmi®

4

t i

3

eef*

s i *

Pal»!t

SffiFmu*.ftKftft

6*

+

T

7

€ ft- h

D 9' 7

y /-;Jl/ h"

y x

^ Tx x 7 'y 7

71/

A

Ty

71/

7

y

y

IS •§•

mkgsAK

molcd

radsr

Sljgfflli

mE

iit

a

«4

SB

&"&

ti , tt

* , «t

a • . -i. HE. i

m s« ffi

y 9" 9 9

y 9' 9 9iv y o 7.

IX S

IS;

"> ?7

w s1 -if

5

tsy x

y 7fi S

mmm.

-a vh

^, jv

- ^ - b

/N- X *

i / 3. —

9 -/? — D

--K iv

7 T 7

•y - * y

9 x —x X-v y 'J-te ;i/ -y ^ ?^ - ^

iv 9

«. 9 \s

-y - /S-7L.

7y

IV

IV

by

b

VA

/%'

7

-

y

;u'fI"

HzNPaJWCVF

as

WbTH°Clmlx

BqGySv

to© si m®.

s->m-kg/s2

N/m2

N-mJ/sA-sW/AC/VV/AA/VV-sWb/m2

Wb/A

cd-srlm/m2

s -J/kgJ/kg

y

b

1

1

B#, a

y

' .+r 71/ (-

K»*f4

12

min,

1, Lt

eVu

eV=1.602l8xl0-

u= 1.66054x10""

h, d

9 J

kg

m4

* y?',<

/<

if+ j .

i/ y

7

u

ft7. b o - A— y- 71/

7U

'J -

b ¥ yK

A

IS ^•

Ab

barGalCiR

radrenv

1 A=0.1 nm=10-'°m

1 b=100fm2=10-28m2

lbar=0.1MPa=105Pa

1 Gal=lcm/s2 = 10-2rn/s2

lCi=3.7xlO"Bq

1 R=2.58xlO-4C/kg

1 rad = lcGy=10"2Gy

1 rem=lcSv=10"2Sv

10"10"10'2

109

106

103

102

10'

10"'

lO"2

io-3

10"'

io-9

10""10""I O - "

mX

" !

X

* *

+

X

X

•fe

X

f

7

T

9 -r

7

* *

ifa

9 bt

•y

y -31

'j

-f 9 Dy13

x A h

H

IS -^

EPTGMkhda

dcmun

Pfa

i. m 1 - 5 1 4

Sg.W&Wi 1985^flJ?flCj;4o izfiL, 1 eV

fc i O* 1 u fflfl(4 CODATA © 1986 3E}fSg

2.

3. bar (4,

. barnfciIf

N( = 10sdyn)

1

9.80665

4.44822

kgf

0.101972

1

0.453592

lbf

0.224809

2.20462

1

tt / t 1 Pa-s(N-s/m2)=10P(#TX)(g/(cm-s))

1 mVs=10'StCx h -

E MPa(=10bar)

1

0.0980665

0.101325

1.33322 x 10"

6.89476 x 10"3

kgf/cm !

10.1972

1

1.03323

1.35951 x 10"3

7.03070 x 10"2

atm

9.86923

0.967841

1

1.31579 xlO"3

6.80460 x 10-2

mmHg(Torr)

7.50062 x 103

735.559

760

1

51.7149

Ibf/in2(psi)

145.038

14.2233

14.6959

1.93368 x 10"2

1

X

IV

¥1

tt

«

J( = 10'erg)

1

9.80665

3.6 xlO6

4.18605

1055.06

1.35582

1.60218 x 10""

kgf-m

0.101972

1

3.67098 x 10 s

0.426858

107.586

0.138255

1.63377 xlO"20

kW- h

2.77778x10"

2.72407X10'6

1

1.16279 x 10'6

2.93072 x 10"

3.76616x10"

4.45050 xlO"26

cal(!t«ft)0.238889

2.34270

8.59999x10'

1

252.042

0.323890

3.82743 xlO"2°

Btu

9.47813x10-'

9.29487 x 10"3

3412.13

3.96759 x 10~3

1

1.28506 xlO'3

1.51857x10'"

ft • lbf

0.737562

7.23301

2.65522 x 10s

3.08747

778.172

1

1.18171 x 10"19

eV

6.24150x10"

6.12082x10"

2.24694x10"

2.61272x10"

6.58515 xlO2 '

8.46233x10"

1

1 cal = 4.18605 J(ttMffi)

= 4.184J (SBKt^)

= 4.1855 J (15 °C)

75 kgf-m/s

735.499 W

Bq

3.7 x 10"

Ci

2.70270 x 10""

1

Gy

1

0.01

rad

100

1

C/kg

2.58 x 10"

3876

1

Sv

1

0.01

100

1

(86ipi2J3 26

imit

kif*

1