Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe

Aarne Lipponen, Jorma Pitkänen, Matti Sarkimo

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Nuclear fuel disposal canisters consist of a copper tube and a cast iron insert. The copper tube is designed for corrosion protection. The design and use of the nodular cast iron insert is based on strength and fracture mechanic aspects and it is the load carrying part of the structure. The preliminary acceptance criteria for the cast iron insert are under study. There are several aspects in accepting the inspection results of nodular cast iron insert for use. One aspect among others is the position of the edge which is nearest to surface. In an earlier study this was stated to have a tolerance of edge position ±5 mm. There have been studies both on eccentricity and the real position of the nearest edge tolerances. To determine the edge position, different ultrasonic techniques were tested using a curved linear PA-probe. To evaluate whether the distance variation is within the tolerance limit, the real geometrical nominal distance must be computed. Because the tolerances of the cast iron insert and its internal geometry can give a large variation in the edge position, these must be carefully evaluated. The applied ultrasonic system is a 128 element phased array equipment. The used probe is curved and adjusted to curvature of the cast iron insert. The curved probe was designed to inspect the edge of the channel with one long axial line scanning. During line scanning the phased array probe does at the same time electronical scanning. To optimize this electronic scanning, three different ultrasonic techniques were used. This evaluation of edge distance was tested in four inspections of real size cast iron inserts. It was seen that the variation of the edge position is about 1 to 12 mm in radial direction (straightness) and in circumferential direc-tion about 2 to 8 mm (twist) in range of about 4 m.
Original languageEnglish
Title of host publicationBaltica VIII
Subtitle of host publicationLife Management and Maintenance for Power Plants
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages221-239
Volume1
ISBN (Electronic)978-951-38-7592-3
ISBN (Print)978-951-38-7591-6
Publication statusPublished - 2010
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 18 May 201020 May 2010

Publication series

NameVTT Symposium
PublisherVTT
Number264
ISSN (Print)0357–9387
ISSN (Electronic)1455–0873

Conference

ConferenceBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period18/05/1020/05/10

Fingerprint

Nodular iron
Die casting inserts
Cast iron
Inspection
Ultrasonics
Scanning
Copper
Nuclear fuels
Corrosion protection
Fracture mechanics
Geometry

Cite this

Lipponen, A., Pitkänen, J., & Sarkimo, M. (2010). Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe. In Baltica VIII: Life Management and Maintenance for Power Plants (Vol. 1, pp. 221-239). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 264
Lipponen, Aarne ; Pitkänen, Jorma ; Sarkimo, Matti. / Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe. Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1 Espoo : VTT Technical Research Centre of Finland, 2010. pp. 221-239 (VTT Symposium; No. 264).
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Lipponen, A, Pitkänen, J & Sarkimo, M 2010, Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe. in Baltica VIII: Life Management and Maintenance for Power Plants. vol. 1, VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 264, pp. 221-239, BALTICA VIII - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 18/05/10.

Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe. / Lipponen, Aarne; Pitkänen, Jorma; Sarkimo, Matti.

Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1 Espoo : VTT Technical Research Centre of Finland, 2010. p. 221-239 (VTT Symposium; No. 264).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe

AU - Lipponen, Aarne

AU - Pitkänen, Jorma

AU - Sarkimo, Matti

PY - 2010

Y1 - 2010

N2 - Nuclear fuel disposal canisters consist of a copper tube and a cast iron insert. The copper tube is designed for corrosion protection. The design and use of the nodular cast iron insert is based on strength and fracture mechanic aspects and it is the load carrying part of the structure. The preliminary acceptance criteria for the cast iron insert are under study. There are several aspects in accepting the inspection results of nodular cast iron insert for use. One aspect among others is the position of the edge which is nearest to surface. In an earlier study this was stated to have a tolerance of edge position ±5 mm. There have been studies both on eccentricity and the real position of the nearest edge tolerances. To determine the edge position, different ultrasonic techniques were tested using a curved linear PA-probe. To evaluate whether the distance variation is within the tolerance limit, the real geometrical nominal distance must be computed. Because the tolerances of the cast iron insert and its internal geometry can give a large variation in the edge position, these must be carefully evaluated. The applied ultrasonic system is a 128 element phased array equipment. The used probe is curved and adjusted to curvature of the cast iron insert. The curved probe was designed to inspect the edge of the channel with one long axial line scanning. During line scanning the phased array probe does at the same time electronical scanning. To optimize this electronic scanning, three different ultrasonic techniques were used. This evaluation of edge distance was tested in four inspections of real size cast iron inserts. It was seen that the variation of the edge position is about 1 to 12 mm in radial direction (straightness) and in circumferential direc-tion about 2 to 8 mm (twist) in range of about 4 m.

AB - Nuclear fuel disposal canisters consist of a copper tube and a cast iron insert. The copper tube is designed for corrosion protection. The design and use of the nodular cast iron insert is based on strength and fracture mechanic aspects and it is the load carrying part of the structure. The preliminary acceptance criteria for the cast iron insert are under study. There are several aspects in accepting the inspection results of nodular cast iron insert for use. One aspect among others is the position of the edge which is nearest to surface. In an earlier study this was stated to have a tolerance of edge position ±5 mm. There have been studies both on eccentricity and the real position of the nearest edge tolerances. To determine the edge position, different ultrasonic techniques were tested using a curved linear PA-probe. To evaluate whether the distance variation is within the tolerance limit, the real geometrical nominal distance must be computed. Because the tolerances of the cast iron insert and its internal geometry can give a large variation in the edge position, these must be carefully evaluated. The applied ultrasonic system is a 128 element phased array equipment. The used probe is curved and adjusted to curvature of the cast iron insert. The curved probe was designed to inspect the edge of the channel with one long axial line scanning. During line scanning the phased array probe does at the same time electronical scanning. To optimize this electronic scanning, three different ultrasonic techniques were used. This evaluation of edge distance was tested in four inspections of real size cast iron inserts. It was seen that the variation of the edge position is about 1 to 12 mm in radial direction (straightness) and in circumferential direc-tion about 2 to 8 mm (twist) in range of about 4 m.

M3 - Conference article in proceedings

SN - 978-951-38-7591-6

VL - 1

T3 - VTT Symposium

SP - 221

EP - 239

BT - Baltica VIII

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Lipponen A, Pitkänen J, Sarkimo M. Ultrasonic inspection of nodular cast iron insert edge distance using curved linear PA-probe. In Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1. Espoo: VTT Technical Research Centre of Finland. 2010. p. 221-239. (VTT Symposium; No. 264).