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| MRC | Name | Details |
|---|---|---|
| CRTL | CRITICALITY CODE JUSTIFICATION | ZZZY |
| MATT | MATERIAL | STEEL OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A234 WPB NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| ZZZT | NONDEFINITIVE SPEC/STD DATA | WPB GRADE |
| ZZZY | REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS |