Code Case

The ASME Code is written by a large committee and many subcommittees, composed of engineers appointed by the ASME. The Code Committee meets regularly to review the code and consider requests for its revision, inter pretation, or extension. Interpretation and extension are accomplished through code cases. The decisions are piibhshed in Mechanical Engineering. Code cases are also mailed to those who subscribe to the service. A typical code case might be the approval of the use of a metal which is not presently on the list of approved code materials. Inquiries relative to code cases should be addressed to the secretary of the ASME Boiler and Pressure Vessel Committee, American Society of Mechanical Engineers, New York. 

DruckbehV with TRB 403, TRB 404, AD-Merkblatt A6 [J Windhorst this is the German equivalent of ASME and ASME Code Case 2211]... 

B. H., Synthesis and enzyme inhibitory activities of novel peptide isosteres, Curr. Med. Chem. 9, 2243-2270, 2002 Roy, R. and Baek, M.G., Glyco-dendrimers novel glycotope isosteres unmasking sugar coding. Case study with T-antigen markers from breast cancer MUCl glycoprotein, J. Bio-technoL 90, 291-309, 2002 Rye, C.S. and Baell, J.B., Phosphate isosteres in medicinal chemistry, Curr. Med. Chem. 12, 3127-3141, 2005. 

All of the EDTs evaluated in this report have withstood hundreds to thousands of detonations in their respective chambers and vessels and in no case was a chamber wall breached as a result of stress cracking or metal fatigue. Both the TC-60 TDC and the DAVINCH DV65 have been found to be in compliance with ASME Boiler and Pressure Vessel Code Case 2564, for impulsively loaded pressure vessel. This code calls for protection against both ductile and brittle failure— that is to say, there should be demonstration of stability against flaws for cracks caused by fragments resulting from detonations. 

Differences in design practices have in the past handicapped developments that could have reduced costs. For example, some difficulties with past design practices are evident in examining application of the ASME Code and Code Case N-47 to pool type LMFRs, such as Super Phenix. The design of Super Phenix resulted in considerably thinner components. This required different buckling rules. Super Phenix design creep effects were negligible... 

Damping Values for Seismic Design of Nuclear Power Plants (Modified as specified in ASME Code Case N-411 and in Section 3.7.1.4)... 

NRC Regulatory Guide 1,47, "Inservice Inspection Code Case Acceptability ASME Section XI Division 1."... 

The following current ASME Code Cases supplement ASME Section III for elevated-temperature appi icat ions ... 

These Code Cases should be used, as applicable, to supplement Subsection NB and NC for elevated-temperature design. 

AR366 1.84 Design and fabrication and materials code case acceptability, ASME Section III. Because... 

AR461 1.192 Operation and maintenance code case acceptability, ASME OM Code (ML030730430)... 

AR462 1.193 ASME code cases not approved for use (ML030730440) (Draft guide was issued as DG-1112,... 

At 923 K, the stress exponent for minimum creep rate is about 9.5 for both the base metals, whereas it is about 12 for the weld metals. However, in the case of SS 316, the weld metal exhibited higher creep rates compared to the base metal whereas forSS316LN the creep rate of the weld metal was lower by a factor of 5 at high stress levels and 10 at lower stress levels, compared to that of its base metal. Both the weld metal exhibited lower rupture elongation compared to that of the respective base metals at 873 and 923 K. Comparison of the rupture lives of the two steels with the ASME Code Case N-47 curves for the base and weld metals showed that in the case of SS 316 LN, the codal allowable stresses are over-conservative. 

SA508-2 QT Flanges, nozzles, rings Current Same as code case 1236... 

Alternatively, the ASME Code, through Code Cases N-629 (ASME, 1999a) and N-631 (ASME, 1999b), allows the use of RTt , the reference temperature using To from the Master Curve fracture toughness approach in ASTM E 1921 (ASTM, 2008). RTt is defined as ... 

The approach for German vessels is again essentially the same as the US method using initial RT m and ARTndt = AT4U for radiation embrittlement. German standards are used as defined in the recently revised KTA 3203 (KTA, 2001). The ISO tup is used for Charpy tests, like the French method. The use of RTt as defined in the ASME Code Cases is allowed in KTA 3203. 

ASME (1999a), ASME Boiler and Pressure Vessel Code Case N-629, Use of fracture toughness test data to establish reference temperature for pressure retaining materials, Section XI, Division i, American Society of Mechanical Engineers, New York. 

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