Technical Challenges of Retubing the E´lectricite´ de France (EDF) Belleville Unit 2

ASME 2011 Power Conference, Volume 1 ◽

10.1115/power2011-55305 ◽

2011 ◽

Author(s):

Merwin W. Jones ◽

Kim M. Massey ◽

David Voisin

Keyword(s):

Leak Test ◽

Brass Alloy ◽

Steel Tubes ◽

Laser Alignment ◽

Alignment System ◽

Leak Testing ◽

Nuclear Station ◽

Surface Condenser ◽

Rolling Torque ◽

Station Unit

This paper describes the numerous challenges involved in the partial retubing of the Belleville Nuclear Station Unit 2 steam surface condenser using 64,242 tubes. Specific challenges of the project included retubing with both duplex stainless steel tubes and with brass alloy tubes, analyzing the risk of flow induced tube vibration and designing a staking system to prevent such vibration, and, replacement of six tubesheets. The tubesheet stresses were analyzed using a beam strip analysis and ANSYS, and new tubesheets were reverse engineered from original drawings. Tubesheets were aligned to the support plate holes using a newly developed laser alignment system. Prior to the retubing, extensive mockup tests were performed to optimize the rolling torque, and to determine rolling parameters that limit the work-hardening of the brass tubes. Testing also included leak testing the mockup joints with a small pressure vessel and then performing a helium leak test of the pressurized tube joints. Tests were performed with both smooth and serrated holes.

Download Full-text

Mechanical stability of the CMS strip tracker measured with a laser alignment system

Journal of Instrumentation ◽

10.1088/1748-0221/12/04/p04023 ◽

2017 ◽

Vol 12 (04) ◽

pp. P04023-P04023

Author(s):

A.M. Sirunyan ◽

A. Tumasyan ◽

W. Adam ◽

E. Asilar ◽

T. Bergauer ◽

...

Keyword(s):

Mechanical Stability ◽

Laser Alignment ◽

Alignment System

Download Full-text

A laser alignment system for boat assembly

Sensor Review ◽

10.1108/02602280010372340 ◽

2000 ◽

Vol 20 (3) ◽

pp. 206-211 ◽

Cited By ~ 2

Author(s):

Zhenwei Su ◽

H. Rowlands

Keyword(s):

Laser Alignment ◽

Alignment System

Download Full-text

Preshipment Leak Testing of 9977 Containment Vessels With the TM Electronics Solution Model S1A-L2-V Leak Tester

ASME 2010 Pressure Vessels and Piping Conference: Volume 7 ◽

10.1115/pvp2010-26095 ◽

2010 ◽

Author(s):

Donald J. Trapp

Keyword(s):

Pacific Northwest ◽

National Laboratory ◽

Pressure Rise ◽

Pacific Northwest National Laboratory ◽

Test Method ◽

Savannah River ◽

Leak Test ◽

Testing Sequence ◽

Leak Testing ◽

Savannah River National Laboratory

Pacific Northwest National Laboratory (PNNL) is replacing its 6M nuclear shipping fleet with 9977 shipping packages, which were designed by Savannah River National Laboratory (SRNL). The new packages require PNNL to perform a preshipment leak test on the lid seals of the containment vessel before the package is shipped on public roads. Savannah River National Laboratory (SRNL) developed a preshipment leak test using a TM Electronics Solution leak tester for PNNL. The Solution is an automatic vacuum leak tester that uses the Gas Pressure Rise leak test method to check the O-ring lid seals and the test port plug seal. The two tests take three minutes each to perform. Because the Solution is fully automatic, the leak test can be done by operators after a few hours of training. This paper describes the test equipment and the testing sequence.

Download Full-text

Programmatic Environmental Impact Statement: related to decontamination and disposal of radioactive wastes resulting from March 28, 1979 accident Three Mile Island Nuclear Station, Unit 2 (Docket No. 50-320). Final supplement dealing with occupational radiation dose. Supplement No. 1

10.2172/8122834 ◽

1984 ◽

Author(s):

Not Given Author

Keyword(s):

Radiation Dose ◽

Environmental Impact ◽

Radioactive Wastes ◽

Environmental Impact Statement ◽

Nuclear Station ◽

Occupational Radiation ◽

Station Unit

Download Full-text

On Hermeticity Detection of Wafer Level Packages for MEMS Devices

Advances in Electronic Packaging, Parts A, B, and C ◽

10.1115/ipack2005-73485 ◽

2005 ◽

Cited By ~ 2

Author(s):

A. Goswami ◽

B. Han ◽

C. Wade ◽

A. Chien

Keyword(s):

Mems Devices ◽

Rate Measurement ◽

Wafer Level ◽

Measurement Sensitivity ◽

Leak Test ◽

Design Assessment ◽

Hermetic Packaging ◽

Wafer Level Packaging ◽

Test Parameters ◽

Leak Testing

Wafer level packaging has emerged as one of the promising solutions for hermetic packaging of MEMS devices. Detection of the level of hermeticity of the package is essential for reliability and design assessment of the devices. Traditionally, hermeticity has been tested using Helium based fine leak testing. However, there are limitations when this technique is used for the hermeticity detection of small volumes (< 10−3 cc) that are typical in wafer level packages. This paper reviews the helium fine leak test, its limitations and the influence of the different test parameters on leakage rate measurement are analyzed for wafer level packages with small cavity volumes. The results indicate a need for development of a new hermeticity measurement technique to achieve the measurement sensitivity required for wafer level packages.

Download Full-text

Implication of Multiple Leak Tests and Impact of Rest Time on Avionic Hybrids

International Symposium on Microelectronics ◽

10.4071/isom-2015-tha55 ◽

2015 ◽

Vol 2015 (1) ◽

pp. 000685-000689

Author(s):

Maureen Perry ◽

Steve Smalley

Keyword(s):

Rest Period ◽

Current Method ◽

Test Time ◽

Repeated Testing ◽

Leak Test ◽

Pressure Cycling ◽

Leak Testing ◽

Rest Time ◽

The Impact ◽

Repeated Test

Since 2007 Northrop Grumman's Baltimore facility has leak tested Hybrid packages primarily through the Optical Leak method. The Optical Leak systems allow for individual part readings performed in parallel and they eliminate the need for separate fine and gross leak tests. As with most leak test operations, there are occasionally parts that need to be retested. One of the benefits of Optical Leak Test is that there is no exposure to liquids, greases, or other contaminates that may plug fine leaks. However, there is concern about the aggregate impact of re-leak testing, and interest in any time effects or “charging” that may occur from repeated test exposure. To investigate the impact of repeated test exposure and determine the effect on test results of retesting parts, NGES Baltimore performed testing on a dozen parts (both leakers and good seals) to measure the amount of distortion repeated testing generates. This paper describes the parts tested and the results from a series of tests spaced approximately 24 hours apart as well as tests performed immediately in conjunction – exposing the parts to repeated pressure cycling without a rest period for recovery. The results show that rapid, repeated testing will yield a slight worsening of the leak measurements (i.e. the test may falsely fail a good part), although the overall magnitude of the shift was not great. Allowing a rest time of 4x the test time worked as a rule of thumb for eliminating the “pressure-charging” effect of prior tests, and that testing performed on different days yielded very consistent results. The current method 1014 leak test MIL-STD-883 has specific guidance against retesting parts. At Northrop Grumman we believe there are instances in which retesting parts is useful, and have shown that with appropriate handling, retest will yield consistent results.

Download Full-text

Inprozess-Dichtheitsprüfung in der Montage/In-process leak testing in assembly

wt Werkstattstechnik online ◽

10.37544/1436-4980-2021-09-76 ◽

2021 ◽

Vol 111 (09) ◽

pp. 650-653

Author(s):

Rainer Müller ◽

Anne Blum ◽

Steffen Klein ◽

Tizian Schneider ◽

Andreas Schütze ◽

...

Keyword(s):

Machine Learning ◽

Added Value ◽

Leak Test ◽

Learning Methods ◽

Machine Learning Methods ◽

Complex Interactions ◽

Leak Testing ◽

Joining Process

In diesem Beitrag wird ein Fügeprozess mittels sensitiver Robotik vorgestellt, bei dem gleichzeitig eine Inprozess-Dichtheitsprüfung durch Methoden des maschinellen Lernens erfolgt. Dabei werden komplexe Wirkzusammenhänge in den Daten extrahiert und Informationen über die Qualität eines zu montierenden Produkts gewonnen. Durch die Kombination eines Füge- und Prüfprozesses wird die Wertschöpfung einzelner Prozesse gesteigert, wodurch eine zeitaufwendige End-of-Line-Prüfung entfallen kann.   In this paper, a joining process using sensitive robotics is introduced, in which an in-process leak test is performed at the same time using machine learning methods. Complex interactions in the data are extracted and information about the quality of a product to be assembled is obtained. By combining a joining and testing process, the added value of individual processes is increased, which eliminates the need for time-consuming end-of-line testing.

Download Full-text

Paper 12: A Long Distance Laser Alignment System

Proceedings of the Institution of Mechanical Engineers Conference Proceedings ◽

10.1243/pime_conf_1968_183_053_02 ◽

1968 ◽

Vol 183 (4) ◽

pp. 65-66

Author(s):

G. J. Reicher ◽

K. D. Harris

Keyword(s):

Mechanical Design ◽

Road Construction ◽

Practical Experience ◽

Long Distance ◽

Tunnel Boring ◽

Laser Alignment ◽

Straight Line ◽

Alignment System ◽

Improved Stability ◽

True Position

An improved laser alignment aid has been designed and built for use in engineering operations such as tunnel boring, pipe laying, or road construction to provide a permanent straight line which maintains its true position between periodic checks by a surveyor, thus avoiding expensive errors. A laser tube has been used which has sealed mirror construction, and the mechanical design is such as to give improved stability in the field. This makes for a second generation instrument which should allow more widespread practical experience of lasers to be obtained in the open.

Download Full-text