SCCに対する保安院の取組み

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1 ( ) 75 1

2 1 : SCC 2 ( 16) NISA 3 PWR ( 17616NISA ) 4 BWR 5 BWR 6 7 ( 16) 8 2

3 (1) Stress Corrosion Cracking (IGSCC: Intergranular Stress Corrosion Cracking) Transgranular Stress Corrosion Cracking) Irradiation Assisted Stress Corrosion Cracking 3

4 4 S C C 2(4) PWR 3(5) PWR < 154, 17 > < 181 > 3(4) < 1510 >

5 1.(3) H15.10 H14.11 H15.3 H H15.4 NISA PLR H15.12 NISAH16.9 NISAH18.3 NISA H14.12 H15.6 H15.9 H16.9 H18.2 WG PLR H15.5 WG 5

6 6

7 NISA 154 (1) (2) (3) (4)

8 8 SUS

9 9

10 10

11 11 ( 20mm 600mm 500mm 400mm 300mm 10mm ) ( ) ( ) ( ) ( )

12 12 (4)-

13 13 (4)- (CRC: Corrosion Resistant Cladding) HSW: Heat Sink Welding) (IHSI: Induction Heating Stress Improvement)

14 14 3.PWR (1)SCC (2) (3) (4) (5) (6) NISA 1512 NISA SCC SCC PWR

15 15 3 H16.11 J Ni PWSCC SCC Ni H16.5 Ni PWSCC SCC Ni H15.9 mm 1mm H16 PWSCC

16 NRC V.C.Summer H12.10) Oconee H13.1) CRDM) J Davis-Besse (H14.3) CRDM PWSCC NRC PWR EDY) (H13.2H14.2 South Texas Project H15.4) Alloy 600)J Alloy 82/182) Alloy 600 PWSCC Alloy 600 Alloy 52 SCC Alloy

17 17 (3)2003 () 18 NRC EDY PWSCC 600Ni Ni Ni (H16.5)

18 18 H15 100mm 100mm Ni H15 Ni H17

19 19 PWR PWSCC PWR PWSCC PWR PWSCC Ni SCC Ni Program for Inspection of Nickel Alloy Components

20 20 (1) BWR BWR (2) (3) (4) (5) (6)

21 (4 ) 3( 14.1) 5( 17.1) 1( 17.12) 2 (18.3) (6 ) 1( 13 ) 2( 11 ) 3( 10 ) 5( 13 ) 1( 12 ) 1( 13 )

22

23 23 H1 H2 H4 H6b H7 H3 H6a H1 H2 H3 H4 H6a H6b H7a H7b H1 H2 H4 H6b H7 H3 H6a H1 H2 H4 H6b H7 H3 H6a H1 H2 H3 H4 H6a H6b H7a H7b H1 H2 H3 H4 H6a H6b H7a H7b H1 H2 H3 H4 H6a H6b H7a H7b

24 6.1E+24 n/m 2 1.3E+25 ( ) (6.1E E+24 24

25 6 25

26 26

27 27

28 28

29 29 ABWR, (2) (3) SUS304 ( )

30 30 5(1) BWR ( )

31 31 5(2)

32 ,KK1 KK4,H3, 1 32

33 2F4,H1,H3, KK1 2F3 33

34 34 5(4) 3 JEAG

35 35 5(5)

36 36 6(1)PWR H H17 H PWR PWSCC 12 WJP 1 [WJP] [WJP] [LP] BMI Ni Ni PWSCC 3 J (H16.5

37 37 6(2) PWSCC (b) 1 600Ni 450MPa 600Ni 300MPa 690Ni PWSCC

38 38 7(1) 17 JNES WG PD PD UT SUS PD PD PD JNES UT ECT H4 ECT JAEA SUS L JNES PLR H18 PLR H19 K

39 7 H16.6 (2) SCC PLR TGSCC 2 TGSCC 3 39

40 7(2) SCC *1) 0.4mm 0.2mm : *2) JNES *1) M. Itow et al., SCC Growth Rates and Reference Curves for Low Carbon stainless Steels in BWR Environment, in: PVP-Vol. 479, Residual Stress, Fracture, and Stress Corrosion Cracking, Ed. Y.-Y. Wang, ASME, New York, NY (2004) p.167. µ 40

41 7(2) SCC SUS316L /s

42 7(2) SCC JNES SCC SCC SCC JSME SUS304 ECP150mV SHE ) JSME ECP150mV SHE ) HAZ) SCC 42

43 43 8 (1) (1) mm/

44 44 (2)

45 45 ( ) JNES BWR -100 mv SHE SCC BWR K 182 PWR IGSCC) SUS IASCC) JMTR BWR

46 46 ( )

47 47 (5) (JSME S NA1-2002)(CC-002) (JSME S NA (2) ( 3 1) ( 1)

48 48 (6)

49 mm PD 1712

50 50 = 1.53

51 7 8 m ~ SUS304SUS316LC 4~5m 51

52 52 SUS316LC

53

54 54

55 ASME ASME ASME NRC (1) (2) (3) (4) (6) (7) (1) (2) (3) (4) (5) 55

56 YES No YES = 4/5 = 30 No 56

57 WG WG2 3

58 58 (3) NISA N 2002 (1) (2) 30mm/ API579 (3) 15 NISA (1) (2) (3) H15 4 )

59 59 (1)

60 60 (2) 2 UT 7080 (7080) (3035)

61 61 (3) UT (UTS

62 (4) L d c dc mm 1.0L5.7 SCC da/dt (m/s) 1.0E E E E NG HAZ (CT ) 316NG (CT ) 316NG (WOL ) SUS304 JSME S NA [5] JSME S NA [5] L SCC NUREG-0313 Rev.2[10] 1.0E K (MPam) 62

63 63 (5) PD PD PD 18 PD PD PD PD 17 PD 17 PD PD 4.4mm PD 169 PD NISA PD NISA

64 (6)PD PD PD PD PD PD PD PD PD 64

JANTI-SANE-03 WG 1. 1.1 197166.817km 16km23km 743 1-1 A, As 1-11-2, 1-3 3760 2981 79.3 1.2 189 Ss Ss S 1-4,5 1-2 1-1 30km 10km Google ZENRIN 1-1 As 1 A 1 B C *1: 2006 1-2 1-2 1-3 1-3 Ss 1-4 6 H21. H21.6/19

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