Codes are produced by engineering societies, both as an aid to their members and as a public service. Codes are not government controlled even though they are sometimes the subject of joint effort or subsequent agree­ment by the government agencies. The American Society of Mechanical Engineers (ASME) codes are an example. Among other things they provide methods for nuclear vessel design (7). Figure 6.1 shows an example of a specific code for jointing sections of wall of unequal thickness from Sec­tion III of the ASME code for nuclear vessels. The Institution of Electronic and Electrical Engineers (IEEE) codes, on the other hand, deal with elec­trical components and systems (2a, b,c).

Heads thir than shell

■Taper may be inside or outside

Permissible

Fig. 6.1. N-466 category A and В joints between sections of unequal thickness. ASME code: section III, nuclear vessels (7). The length of required taper L may include the width of the weld. In all cases L shall not be less than 3 times the offset between the abutting plates.

Section 10 of the Code of Federal Regulations (CFR) for Atomic Energy

(5) is important in the sense that these are the codes by which licensing bodies judge the applicants. The codes 10 CFR 20 and 10 CFR 100 for radiological evaluation have been referred to previously. Section 6.3 refers to 10 CFR 50 as a guide to safety evaluation report preparation.