When a crack is detected in a nuclear piping system during in-service inspections, failure estimation method provided in codes such as ASME Boiler and Pressure Vessel Code Section XI or JSME Rules on Fitness-for-Service for Nuclear Power Plants can be applied to evaluate the structural integrity of the cracked pipe. In the current codes, the failure estimation method for circumferentially cracked pipes is applicable for both bending moment and axial force due to pressure. Torsion moment is not considered. Recently, two failure estimation methods for circumferentially cracked pipes subjected to combined bending and torsion moments were proposed based on analytical investigations on the limit load for cracked pipes. In this study, experimental investigation was conducted to confirm the applicability of the failure estimation method for cracked pipes subjected to bending and torsion moments. Experiments were carried out on 8-in. diameter Schedule 80 stainless steel pipes containing a circumferential surface crack. Based on the experimental results, the proposed failure estimation methods were confirmed to be applicable to cracked pipes subjected to combined bending and torsion moments.

References

References
1.
Kanninen
,
M. F.
,
Broek
,
D.
,
Marschall
,
C. W.
,
Rybicki
,
E. F.
,
Sampath
,
S. G.
,
Simonen
,
F. A.
, and
Wilkowski
,
G. M.
,
1976
, “
Mechanical Fracture Predictions for Sensitized Stainless Steel Piping With Circumferential Cracks
,” Paper No. EPRI NP-192.
2.
ASME
,
2012
, “
ASME Boiler and Pressure Vessel Code Section XI, Rules for Inservice Inspection of Nuclear Power Plant Components
,”
American Society of Mechanical Engineers
,
New York
.
3.
JSME
,
2012
, “
Rules on Fitness-for-Service for Nuclear Power Plants
,” The Japan Society of Mechanical Engineers, Paper No. JSME S NA1-2012.
4.
ASME
,
2010
, “
ASME Boiler and Pressure Vessel Code Section III, Rules for Construction of Nuclear Facility Components
,”
American Society of Mechanical Engineers
,
New York
.
5.
JSME
,
2008
, “
Rules on Design and Construction for Nuclear Power Plants
,”
The Japan Society of Mechanical Engineers
,
Tokyo, Japan
, Paper No. JSME S NC1-2008.
6.
Li
,
Y.
,
Hasegawa
,
K.
,
Ida
,
W.
,
Hoang
,
P. H.
, and
Bezensek
,
B.
,
2010
, “
Effect of Torsion Moment on Failure Bending Moment for Circumferentially Cracked Pipe
,”
Trans. Jpn. Soc. Mech. Eng., Ser. A
,
76
(
762
), pp.
164
170
(in Japanese).
7.
Li
,
Y.
,
Ida
,
W.
,
Hasegawa
,
K.
,
Bezensek
,
B.
, and
Hoang
,
P. H.
,
2010
, “
Effect of Pressure on Plastic Collapse Under the Combined Bending and Torsion Moments for Circumferentially Surface Flawed Pipes
,”
ASME
2010
Pressure Vessels and Piping Conference
,
Bellevue
,
Washington
, ASME Paper No. PVP2010-25102.10.1115/PVP2010-25102
8.
Li
,
Y.
,
Hasegawa
,
K.
,
Hoang
,
P. H.
, and
Bezensek
,
B.
,
2012
, “
Prediction Method for Plastic Collapse of Circumferentially Cracked Pipes Subjected to Combined Bending and Torsion Moments
,”
ASME J. Pressure Vessel Technol.
,
134
(
6
), p.
061207
.10.1115/1.4007032
9.
Bezensek
,
B.
,
Li
,
Y.
,
Hasegawa
,
K.
, and
Hoang
,
P. H.
,
2012
, “
Inclusion of Torsion Loads in Section XI Flaw Evaluation Procedures for Pipes Containing Surface Crack-Like Flaws
,”
ASME J. Pressure Vessel Technol.
,
134
(
3
), p.
031003
.10.1115/1.4005875
10.
Hoang
,
P. H.
,
Bezensek
,
B.
,
Hasegawa
,
K.
, and
Li
,
Y.
,
2012
, “
Effects of Torsion on Equivalent Bending Moment for Limit Load and EPFM Circumferential Pipe Flaw Evaluations
,”
ASME J. Pressure Vessel Technol.
,
134
(
6
), p.
061206
.10.1115/1.4006559
11.
Miura
,
N.
,
Hoshino
,
K.
,
Li
,
Y.
, and
Doi
,
H.
,
2011
, “
Net-Section-Collapse of Circumferentially Cracked Cylinders Subjected to Torsional Moment
,”
ICONE19-43356, 19th International Conference on Nuclear Engineering
,
Osaka
,
Japan
.
12.
Miura
,
N.
,
Hoshino
,
K.
,
Li
,
Y.
, and
Hasegawa
,
K.
,
2012
, “
Experimental Investigation on Net-Section-Collapse Criterion for Circumferentially Cracked Cylinders Subjected to Torsional Moment
,”
ASME
2012 Pressure Vessels and Piping Conference
,
Toronto, Ontario, Canada
, ASME Paper No. PVP2012-78662.10.1115/PVP2012-78662
13.
Li
,
Y.
,
Hasegawa
,
K.
,
Miura
,
N.
, and
Hoshino
,
K.
,
2013
, “
Experimental Investigation of Failure Estimation Method for Stainless Steel Pipes With a Circumferential Crack Subjected to Combined Tensile and Torsion Loads
,”
ASME J. Pressure Vessel Technol.
,
135
(
4
), p.
041405
.10.1115/1.4023735
14.
Iwamatsu
,
F.
,
Miyazaki
,
K.
,
Hamanaka
,
T.
,
Takahashi
,
Y.
, and
Saito
,
K.
,
2011
, “
Estimation of Maximum Load for Pipes With Multiple Circumferential Flaws by Limit Load Analysis
,”
ASME
2011 Pressure Vessels and Piping Conference
,
Baltimore
,
Maryland
, ASME Paper No. PVP2011-57876.10.1115/PVP2011-57876
15.
Machida
,
H.
,
Hamanaka
,
T.
,
Takahashi
,
Y.
,
Miyazaki
,
K.
,
Iwamatsu
,
F.
,
Saito
,
K.
,
Itatani
,
M.
,
Narazaki
,
C.
, and
Hojo
,
K.
,
2011
, “
Fracture Assessment of Pipes Having Multiple Flaws Based on Ramberg-Osgood-Type Stress-Strain Relationships
,”
ASME
2011 Pressure Vessels and Piping Conference
,
Baltimore
,
Maryland
, ASME Paper No. PVP2011-57859.10.1115/PVP2011-57859
You do not currently have access to this content.