Bases for location for analysis matrix in a nuclear reactor

Figure 4a

Bases for Location for Analysis Matrix in a PWR

Modes (MD_j) and Submodes (SD_j) of degradation considered at each location

Submodes of SCC
- Low potential SCC (LPSCC)
- High potential SCC (HPSCC)
- Acidic SCC (AcSCC)
- Alkaline SCC (AkSCC)
- Lead SCC (PbSCC)
Submodes of IGC
- High potential IGC (HPIGC)
- Acidic IGC (AcIGC)
- Alkaline IGC (AkIGC)
Other modes
- Wastage
- Pitting
- Fatigue
- Wear

Figure 4b

Location for Analysis Matrix in a PWR

Submodes of SCC

			Submodes of SCC
			LPSCC	HPSCC	AcSCC	MRSCC	AkSCC	PbSCC
		Tube	j = 1	j = 2	j = 3	j = 4	j = 5	j = 6
Tubesheet expansion	i =1	ID
..	i =2	OD
Top of tubesheet	i =3	ID
..	i =4	OD
Sludge	i =5	OD
Free span	i =6	ID
..	i =7	OD
Tube support	i =8	OD
..	i =9	OD
U-bend	i =10	ID
U-bend AVB	i =11	OD

Submodes of IGC

			Submodes of IGC
			HPIGC	AcIGC	AkIGC
		Tube	j = 7	j = 8	j = 9
Tubesheet expansion	i =1	ID
..	i =2	OD
Top of tubesheet	i =3	ID
..	i =4	OD
Sludge	i =5	OD
Free span	i =6	ID
..	i =7	OD
Tube support	i =8	OD
..	i =9	OD
U-bend	i =10	ID
U-bend AVB	i =11	OD

Other Modes

			Other Modes
			LPSCC	HPSCC	AcSCC	MRSCC
		Tube	j = 10	j = 11	j = 12	j = 13
Tubesheet expansion	i =1	ID
..	i =2	OD
Top of tubesheet	i =3	ID
..	i =4	OD
Sludge	i =5	OD
Free span	i =6	ID
..	i =7	OD
Tube support	i =8	OD
..	i =9	OD
U-bend	i =10	ID
U-bend AVB	i =11	OD

The abbreviations, "LP," "HP," "Ac," "Ak," and "Pb" for "SCC" and "IGC" refer to "low potential," "high potential," "acidic," "alkaline," and "lead" for "stress corrosion cracking" and "intergranular corrosion" LA_i

Lifetime Prediction, Roger W. Staehle, Adjunct Professor, Department of Chemical Engineering and Materials Science, University of Minnesota, Staehle Consulting Co.