ML12089A631
| ML12089A631 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 02/20/2004 |
| From: | American Society of Mechanical Engineers (ASME) |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| Shared Package | |
| 12089617 | List: |
| References | |
| RAS 22134, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 | |
| Download: ML12089A631 (10) | |
Text
CASE CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-S13-2 Approval Date: February 20, 2004 The ASME Boiler and Pressure Vessel Standards Committee took action to eliminate Code Case expiration dates effective March 11,2005. This means that all Code Cases listed in this Supplement and beyond will remain available for use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.
Case N*513*2 Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Section XI, Division 1 Inquiry; What requirements may be used for temporary acceptance of flaws, including through-wall flaws, in mod erate energy Class 2 or 3 piping, without performing a repair/replacement activity?
Reply: It is the opinion of the Committee that the follow ing requirements may be used to accept flaws, including through-wall flaws, in moderate energy Class 2 or 3 piping, without performing a repair/replacement activity for a lim ited time, not exceeding the time to the next scheduled outage.
1 SCOPE (a) These requirements apply to the ASME Section m, ANSI B31.1, and ANSI B31.7 piping, classified by the Owner as Class 2 or 3. The provisions of this Case do not apply to the following:
( I) pumps, valves, expansion joints and heat exchangers; (2) socket welds; (3) leakage through a flange joint; (4) threaded connections employing nonstructural seal welds for leakage protection.
(b) The provisions of the Case apply to Class 2 or 3 piping whose maximum operating temperature does not exceed 200°F (93°C) and whose maximum operating pres sure does not exceed 275 psig (1.9 MPa).
(c) The following fl aw evaluation criteria are permitted for pipe and tube. The flaw evaluation criteria are permitted for adjoining fittings and flanges to a distance of (RoOV2 from the weld centerline.
(d) The provisions ofthis Case demonstrate the integrity of the item and not the consequences of leakage. It is the responsibility of the Owner to demonstrate system opera bility considering effects of leakage.
2 PROCEDURE (a) The flaw geometry shall be characterized by volu metric inspection methods or by physical measurement.
The full pipe circumference at the flaw location shall be inspected to characterize the length and depth of all flaws in the pipe section.
(b) Flaw shall be classified as planar or nonpJanar.
(c) When multiple flaws, including irregular (com pound) shape flaws, are detected, the interaction and com bined area loss of flaws in a given pipe section shall be accounted for in the flaw evaluation.
(d) A flaw evaluation shall be performed to determine the conditions for flaw acceptance. Section 3.0 provides accepted methods for conducting the required analysis.
(e) Frequent periodic inspections of no more than 30 day intervals shall be used to detennine if flaws are growing and to establish the time at which the detected flaw will reach the allowable size. Alternatively, a flaw growth eval uation may be performed to predict the time at which the detected flaw will grow to the allowable size. The flaw growth analysis shall consider the relevant growth mecha nisms such a<; general corrosion or wastage, fatigue, or stress corrosion cracking. When a flaw growth analysis is used to establish the allowable time for temporary opera tion, periodic examinations of no more than 90 day inter vals shall be conducted to verify the flaw growth analysis predictions.
(f) For through-wall leaking flaws, leakage shall be observed by daily walkdowns to confinn the analysis con ditions used in the evaluation remain valid.
(g) If examinations reveal flaw growth rate to be unac ceptable. a repair or replacement shall be performed.
(h) Repair or replacement shall be performed no later than when the predicted flaw size from either periodic inspection or by flaw growth analysis exceeds the accept ance criteria of 4.0, or the next scheduled outage, whichever occurs first. Repair or replacement shall be in accordance with IWA-4000 or IWA-7000, respectively, in Editions and Addenda prior to the 1991 Addenda; and, in the 1991 Addenda and later, in accordance with lWA-4000.
- 0) Evaluations and examination shall be documented in accordance with IW A-6300. The Owner shall document the use of this Case on the applicable data report fonn.
The Committee's function is to establish rules of safety. relating only to pressure integrity, governing the construction of boilers, pressure vessels, transport tanks and nuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to Interpret these rul6$ when questions arise regarding their intent. This Code does not address other safety issues relating to the constructton of boilers, pressure vessels, transport tanks and nuclear components.
and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, taws, regulations or other relevant documents.
I (N-513-2)
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CASE (continued)
N..513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODE FIG. 1 THROUGH-WALL FLAW GEOMETRY (al Circumferential Flaw (bl Axial Flaw 3
FLA W EV ALVA TION (a) For planar flaws, the flaw shall be bounded by a rectangular or circumferential planar area in accordance with the methods described in Appendix C. IWA-3300 shaH be used to determine when multiple proximate flaws are to be evaluated as a single flaw. The geometry of a through-wall planar flaw is shown in Fig. 1.
(b) For planar flaws in austenitic piping, the evaluation procedure in Appendix C shall be used. Flaw depths up to 100% of wall thickness may be evaluated. When through-wall circumferential flaws are evaluated, the for mulas for evaluation given in C-5320 of Appendix C may be used, with the flaw penetration (alt) equal to unity.
When through-wall axial flaws are evaluated, the allowable flaw length is:
(2)
Uj = (S, + Su)/2 (3) where p = pressure for the loading condition Do = pipe outside diameter OJ' ::::: flow stress Sy = Code specified yield strength Su = Code specified ultimate tensile strength and SFm = structural factor on primary membrane stress as specified in C-2622 Material properties at the temperature of interest shall be used.
(e) For planar flaws in ferritic piping, the evaluation procedure of Appendix C shall be used. Flaw depths up to 100% of wall thickness may be evaluated. When through-wall circumferential flaws are evaluated in accor dance with C-5300 or C-6300, the flaw penetration (alt) shall be set to unity. When through-wall axial flaws are evaluated in accordance with C-5400, the allowable length is defined by Eqs. (1) through (3), with the appropriate structural factors from Appendix C, C-2622. When through-wall flaws are evaluated in accordance with C-7300 or C-7400, the formulas for evaluation given in C-4300 may be used, but with values for F"" Fb, and F applicable to through-wall flaws. Relations for F"" Fb, and F that take into account flaw shape and pipe geometry (R I t ratio) shall be used. The appendix to this Case provides equations for Fill' Fb, and F for a selected range of R It.
Geometry of a through-wall crack is shown in Fig. I.
(d) For nonplanar flaws, the pipe is acceptable when the remaining pipe thickness (tp) is greater than or equal to the minimum wall thickness 1I11i,,:
(4) tmill = 2(S + O.4p) where p = maximum operating pressure at flaw location S = allowable stress at operating temperature and the longitudinal stress limits for the Construction Code are satisfied for a unifonn wall thickness equal to tp Alternatively, an evaluation may be performed as given below. The evaluation procedure is a function of the depth and the extent of the affected area as illustrated in Fig. 2.
( I) When the width of wall thinning Wm that exceeds tmbl> is less than or equal to 0.5 (R"t)I!2, where R" is the outside radius and Wm is defined in Fig. 2, the flaw can be classified as a planar flaw and evaluated in accordance with 3(a) through 3(c), above. When the above requirement is not satisfied, (2) shall be met.
(2) When the transverse extent of wall thinning that exceeds tmill' L",(t), is not greater than (R"tmlll )lI2, ta/o(' is 2 (N-5J3-2)
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CASE (continued)
CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-513-2 FIG.2 ILLUSTRATION OF NON PLANAR FLAW DUE TO WALL THINNING Section A-A Axial Transverse (circumferential) direction determined from Curve 1 of Fig. 3, where Lm(li is defined in Fig. 2. When the above requirement is not satisfied, (3) shall be met.
(3) When the maximum extent of wall thinning that exceeds tmi,,, L"" is less than or equal to 2.65 (Rotmin)1I2 and tnom is greater than 1.13t",i,,, ta/oc is determined by satisfying both of the following equations:
tulor ~ 1.5~ [1 _1,10"'] + 1.0 (5) tmi" L
tmill (6)
When the above requirements are not satisfied, (4) shall be met.
(4) When the requirements of (I), (2), and (3) above are not satisfied, talm.' is determined from Curve 2 of Fig.
- 3. In addition, taloe shall satisfy the following equation:
[0.5 + (11/0'") ((J'b)]
fmlll S
(7) fmill ~ ~-~1"".8""':"....!-":';;;"
where (Tb is the nominal pipe longitudinal bending stress resulting from all primary pipe loadings.
(e) When there is through-wall penetration along a por tion of the thinned wall, as illustrated in Fig. 4, the flaw may be evaluated by the branch reinforcement method.
The thinned area including the through-wall penetration shall be represented by a circular opening at the flaw loca tion. Only the portion of the flaw lying within tad} need be considered as illustrated in Fig. 5. When evaluating multi ple flaws in accordance with IWA-3330, only the portions of the flaws contained within tad} need be considered.
The minimum wall thickness, tmil', shall be determined by eq. (4). For evaluation purposes, the adjusted wall thick ness, tad}, is the postulated thickness as shown in Fig. 5.
The pipe wall thickness is defined as the thickness of the pipe in the non-degraded region as shown in Fig. 5(a). The diameter of the opening is equal to dad} as defined by tad}
as shown in Fig. 5(a). The postulated value for tad} shall be greated than tmill and shall not exceed the pipe wall thickness. The tad} value may be varied between t",ill and the pipe wall thickness to determine whether there is a 3 (N-5J3-2)
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CASE (continued)
N-S13-2 CASES 01<' ASME BOILER AND PRESSURE VESSEL CODE FIG.3 ALLOWABLE WALL THICI(NESS AND LENGTH OF LOCALLY THINNED AREA 0.8 0.6
'SJ--~
..." 0.4 0.2 o L-____
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~~~
~
~_______L______~____
__~~____L_____~______
2 3
combination of tadj and d"dj that satisfies the branch rein forcement requirements.
The required area reinforcement for the postulated circu lar opening, d"dj and fcu},;' as illustrated in Fig. 5(b), shall be calculated in accordance with NC-3643.3 or ND-3643.3, as appropriate. If a flaw growth analysis is performed, the growth in flaw dimensions shall consider the degradation mechanism(s) as relevant to the application. The flaw is acceptable when there is sufficient thickness in the degraded area to provide the required area reinforcement.
Compliance with the primary stress limits of the Construc tion Code shall be verified. The flow area of the flaw, or the total of the flow areas of multiple flaws that are com bined into a single flaw for the purpose of evaluation, shall not exceed the lesser of the flow area of the pipe or 20 in.2 (130 cm2).
(j) Alternatively, when there is through-wall penetration along a portion of the thinned wall as illustrated in Fig. 4 the flaw may be evaluated as two independent planar through-wall flaw-one oriented in the axial direction and the other oriented in the circumferential direction. The minimum wall thickness tmill' shall be determined by eq.
(4). The through-walllenghts for each flaw are the lenghts Lax;al and L circ, where the local wall thickness is equal to tmlll as projected along the axial and circumferential planes as shown in Fig. 4. The two planar flaws so constructed shall be evaluated to 3(a) and 3(b) or 3(c), as appropriate.
If a flaw growth analysis is performed, the growth in flaw dimensions shall consider both corrosion and crack-growth mechanisms as relevant to the application. The flow area of the flaw, or the total of the flow areas of multiple flaws that are combined into a single flaw for the purpose of 5
6 7
8 evaluation, shall not exceed the lesser of the flow area of the pipe or 20 in.2 (130 cm2).
(g) In performing a flaw growth analysis, the procedures in C-3000 may be used as guidance. Relevant growth rate mechanisms shall be considered. When stress corrosion cracking (SCC) is active, the following growth rate equa tion shall be used:
da/dt = S.l'CK,~ax (8) where da/dt is flaw growth rate in incheslhour. Kmax is the maximum stress intensity factor under long-term steady state conditions in ksi in.O.5, Sr is a temperature correction factor, and C and n are material constants.
For intergranular SCC in austenitic steels, where Ts 200°F (93°q.
C 1.79 X 10-8 Sr = I n ::;;: 2.161 For transgranular SCC in austenitic steels. where T s 200°F (93°q.
C 1.79 x 10-7 Sr 3.71 X 108 [1O(0.01842T 12.25)]
n = 2.161 The temperature T is the metal temperature in degrees Fahrenheit. The flaw growth rate curves for the above SCC growth mechanisms are shown in Figs. 6 and 7. Other growth rate parameters in eq. (8) may be used. provided they are supported by appropriate data.
(h) For nonferrous materials, nonplanar and planar flaws may be evaluated following the general approach of 3(a) 4 (N-5J3-2J Copy,lghi ASME Intem.tioMl (BPVC)
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CASE (continued)
CASES 0];' ASME BOILER AND PRESSURE VF.sSEL CODE N-513-2 FlG.4 ILLUSTRATION OF THROUGH-WALL NONPLANAR FLAW DUE TO WALL THINNING Through-wall (min I penetration
+1 taY~
1---- Laxial ---1 Section A-A Transverse (circumferential)
Axial direction direction 5 (N-513-2)
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CASE (continued)
N-513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODE FIG.5 ILLUSTRATION OF ADJUSTED WALL THICKNESS AND EQUIVALENT HOLE DIAMETER I
Through-wall penetration T
Pipe
............~"""--i_____-+...............~~lwall (a) Adjusted Wall Thickness (bl Equivalent Hole Representation 6 (N-513-2)
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CASE (continued)
CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-513-2 through 3(g) above. For planar flaws in ductile materials, the approach given in 3(b) and 3(g) may be used; otherwise, the approach given in 3(c) and 3(g) should be applied.
Structural factors provided in 4 shall be used. It is the responsibility of the evaluator to establish conservative estimates of strength and fracture toughness for the piping material.
4 ACCEPTANCE CRITERIA Piping containing a circumferential planar flaw is accept able for temporary service when flaw evaluation provides a margin using the structural factors in Appendix C, C-2621. For axial planar flaws. the structural factors for temporary acceptance are as specified in Appendix C, C-2622. Piping containing a nonplanar part through-wall flaw is acceptable for temporary service if tl' ~ t"loco where taloc is determined from 3( d). Piping containing a non planar through-wall flaw is acceptable for temporary service when the flaw conditions of 3(e) or 3(f) are satisfied.
5 AUGMENTED EXAMINATION An augmented volumetric examination or physical mea surement to assess degradation of the affected system shall be performed as follows:
(a) From the engineering evaluation. the most suscepti ble locations shall be identified. A sample size of at least five of the most susceptible and accessible locations. or.
if fewer than five, all susceptible and accessible locations shall be examined within 30 days of detecting the flaw.
(b) When a flaw is detected, an additional sample of the same size as defined in 5(a) shall be examined.
(e) This process shall be repeated within 15 days for each successive sample, until no significant flaw is detected or until 100% of susceptible and accessible locations have been examined.
6 NOMENCLATURE C = coefficient in the crack growth relationship Do = outside pipe diameter F
nondimensional stress intensity factor for through-wall axial flaw under hoop stress F" = nondimensional stress intensity factor for through-wall circumferential flaw under pipe bending stress Fm = nondimensional stress intensity factor for through-wall circumferential flaw under mem brane stress L = maximum extent of a local thinned area with t < tnom Laxial = length of through-wall crack for the hole pene tration in the axial direction of the pipe Lcirc length of through-wall crack for the hole diam eter penetration in the circumferential direction of the pipe Lm = maximum extent of a local thinned area with t < tmin LIII(,,) = axial extent of wall thinning below tmill Lm(t) = circumferential extent of wall thinning below tmill R = pipe radius Ro = outside pipe radius S
allowable stress at operating temperature SF", = structural factor on primary membrane stress ST = coefficient for temperature dependence in the crack growth relationship S" = Code-specified ultimate tensile strength S\\, = Code-specified yield strength W", = maximum extent of a local thinned area per pendicular to Lm with t < tmin e = half crack length daldt = flaw growth rate for stress corrosion cmcking d",tj := diameter equivalent circular hole at t(((tj dmil! = diameter of equivalent circular hole at tmi11 f = total crack length = 2e fall = allowable axial through-wall flaw length n = exponent in the crack growth relationship p = maximum operating pressure at flaw location t = wall thickness t(!(lj = adjusted wall thickness which is varied for evaluation purposes in the evaluation of a through-wall non planar flaw taloc = allowable local thickness for a nonplanar flaw tmin = minimum wall thickness required for pressure loading tllOll! = nominal wall thickness tp = minimum remaining wall thickness A = nondimensional half crack length for through-wall axial flaw OJ' = material flow stress 0;, = pipe hoop stress due to pressure 0;,== nominal longitudinal bending stress for pri mary loading without stress intensification factor (9 = half crack angle for through-wall circumferen tial flaw 7
APPLICABILITY This Case is applicable from the 1983 Edition with the Winter 1985 Addenda through the 2001 Edition with the 2003 Addenda. References in this Case to Appendix C shall mean Appenidx C of the 2002 Addenda. For editions and addenda prior to 2002 Addenda, Class I pipe flaw evaluation procedures may be used for other piping classes.
As a matter of definition, the term "structural factor" is equivalent to the term "safety factor" that is used in earlier editions and addenda.
7 (N-513-2)
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CASE (continued)
N-513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODI:!:
FIG. b FLAW GROWTH RATE FOR IGSCC IN AUSTENITIC PIPING 1.0E-02 1.0E-03 1.0E-04
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U 1.0E-OS 1.0E-07 1.0E-08
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r-Austenitic Piping I
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r-T-::; 200F l-i 1!f I
am I
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tmr
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n
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1 10 100 Stress Intensity Factor, K (ksi in.o.5)
O5 GENERAL NOTE:
(SI conversion: 1.0 in/hr 7.06 x 10') mm/sec; 1.0 Ksi in.O.5 1.099 MPa m * ; *C
[OF - 32J11.8).
8 (N-513-2)
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CASE (continued)
CASES 01<' ASME HOlLER AND PRESSURE VESSEL CODE N-S13-2 FIG_ 7 FLAW GROWTH RATE FOR TGSCC IN AUSTENITIC PIPING 1.OE-02 1.OE-03 1.OE-04
~
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10 100 Stress Intensity Factor, K (ksi in.O.5) s GENERAL NOTE: (SI conversion: 1.0 inlhr = 7.06 x 10" mm/sec; 1.0 Ksi in.a.
1.099 MPa mO.5; °C = [OF 32J/1.8J.
9 (N-513-2)
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CASE (continued)
CASES OJ.' ASME BOILER AND PRESSURE VESSEL CODE N 513-2 MANDATORY APPENDIX I RELATIONS FOR F m, Fh, AND F FOR THROUGH-WALL FLAWS 1-1 DEFINITIONS For through-wall fta ws, the crack depth (a) will be replaced with half crack length (c) in the stress intensity factor equations in C-73DO and C-7400 of Section XI, Appendix C. Also, Q will be set equal to unity in C-7400.
1-2 CIRCUMFERENTIAL FLAWS For a range of Rlt between 5 and 20, the following equations for Fm and F" may be used:
where e== Half crack angle = clR R = Mean pipe radius t
Pipe wall thickness and Am== -2.02917 + 1.67763 (Rlt) 0.07987 (Rlt)2
+ 0.00176 (Rlt)3 Bm== 7,09987 - 4.42394 (Rlt) + 0.21036 (RId
- 0.00463 (Rlt)3 Cm = 7.79661 + 5.16676 (Rlt) - 0,24577 (Rlt)2
+ 0.00541 (RIt)3 Ab :: -3.26543 + 1.52784 (Rlt) - 0.072698 (Rlt)2
+ 0.0016011 (Rlt)3 B"== 11.36322 - 3.91412 (Rlt) + 0.18619 (Rlt)2
- 0.004099 (Rltp Cb = -3.18609 + 3.84763 (Rlt) - 0.18304 (Rlt)2
+ 0.00403 (Rlt)3 Equations for Fm and Fb are accurate for Rlt between 5 and 20 and become increasingly conservative for Rlt greater than 20. Alternative solutions for F", and Fb may be used when RIt is greater than 20.
1-3 AXIAL FLAWS For internal pressure loading, the following equation for F may be used:
F = I + 0.072449.1 + 0.64856.12 -
0.2327.1 3
+ 0.038154;\\4 - 0.0023487;\\5 where c = half crack length A
cl(Rnt/J.
The equation for F is accurate for ;\\ between 0 and 5.
Alternative solutions for F may be used when ;\\ is greater than 5.
10 (N-513-2)
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