Audio data on an audio CD is not stored in the .wav format. The ISRC for a CD is not embedded in the audio data, but in a separate area of the CD (Q channel). Consequently when you rip a CD, or translate from .wav and write audio data to it, you will typically not bring over the ISRC with an extracted .wav file, and the ISRC will be stripped from the .wav header before the data is written to the Redbook Audio file. To write the ISRC to the CD you need authoring software that supports it. If you were to successfully embed the ISRC in a wave file, and write the file to a data CD the code should travel with the file, but the CD would not play on most CD players.
Although the variety of metadata that can be included in standard RIFF WAVE files is significant, it seems not to be well standardized. The ISRC can be added as a comment or information or as part of a tag, but it may not be recognized as an ISRC, but just as text. The more common way to embed ISRC is to write the file in the Broadcast Wave format (.bwf), for which there are a bunch of free metadata editors available.
Common compressed audio formats like MP3, usually use the ID3 tag to embed the ISRC, which is the method recommended by usirc.org.
http://wavmetadata.blogspot.com/ http://www.sonorissoftware.com/catalog/isrc-editor-p-59.html?osCsid=993744de9279345bacb1a0470c79eba4 http://bwfmetaedit.sourceforge.net/ http://www.audiorecording.me/how-to-embed-and-read-isrc-codes-of-mp3-files-for-free-linuxwindows.html https://sourceforge.net/projects/kid3/