ML18005A418

Metallurigical Evaluation of EDG Bases from Cp&L,Shearon Harris Nuclear Station.

ML18005A418
Person / Time
Site:	Harris
Issue date:	03/31/1988
From:	Wachob H FAILURE ANALYSIS ASSOCIATES, INC.
To:
Shared Package
ML18005A416	List: ML18005A415 ML18005A418
References
PA-R-88-03-15, PA-R-88-3-15, NUDOCS 8805170174
Download: ML18005A418 (9)

Text

PA-R-88-03-15 QRCPL METALLURGICALEVALUATIONOF EDG BASES FROM THE CAROLINAPOWER AND LIGHT SHEARON HARRIS NUCLEAR STATION I

Prepared for:

Steven E. Eckert Duke Engineering & Services, Inc.

526 South Church Street Charlotte, North Carolina 28236 Prepared by:

Dr. Harry Wachob 2225 E. Bayshore Road Failure Analysis Associates Palo Alto, California 94303 March 1988 FaAA Project No. QRCPL

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METALLURGICALEVALUATIONOF EDG BASES FROM THE CAROLINAPOWER AND LIGHT SHEARON HARRIS NUCLEAR STATION Failure Analysis Associates (FaAA) has completed the examination of the two emergency diesel base samples taken from Shearon Harris Nuclear Station.

Procedures outlined in Method 2 of Supplement 1, Revision 1 to the TDI Owners Group Engine Base report were used to evaluate the cast iron samples removed from EDG 1A and 1B respectively. Metallographic procedures, as outlined in ASTM E-3, were used to prepare the specimens for metallurgical evaluation.

Metallographic examination of the base sample removed from EDG S/N 74046, Engine 1A, (Evidence No. PA07596-72, mount I280), did not reveal any evidence of Widmanstatten graphite. The grey cast iron matrix was pearlitic with small regions of ferrite. Photomicrographs of a randomly selected region showing the typical microstructure are provided in Figures 1 and 2.

Metallographic examination of the base sample removed from EDG 74047, Engine 1B, (Evidence No. PA07596-73, mount I281), also did not exhibit any evidence of Widmanstatten graphite. Again, the matrix was pearlitic with small regions of ferrite. Photomicrographs of a typical region are provided in Figures 3 and 4.

The certified chemical and physical properties provided by TDI for each engine base are within the nominal property ranges for ASTM AA8 class 40 grey cast iron.

Test results for base S/N 74046 (Base 1A) are provided in a TDI Q.C. memo dated 9/24/80. Results of tests performed on base S/N 74047 (Base 1B) were reported in a TDI Q.C. memo dated 12/15/80. Therefore, both 74046 and 74047 engine bases can be classified as being made from nominal class 40 grey cast iron that does not contain Widmanstatten graphite.

Figure 1. Low magnification photomicrograph of the sample removed from EDG base 1A, S/N 74046, Evidence No. PA07596-72. The black graphite flakes are surrounded by a predominantly pearlitic matrix. No evidence of Widmanstatten graphite is observed.

Magnification: 88.5X Photo ID No.: PA07596-DW1-2-17-88

Figure 2. Higher magniQcation photomicrograph of the base sample removed from EDG 1A. Note the dark gray graphite Qakes, the white ferrite phase surrounding portions of several graphite Qakes and the pearlitic matrix.

Magnification: 446X Photo ID No.: PA07596-DW2-2-17-88

Figure 3. Low magnification photomicrograph of the sample removed from EDG base 1B, S/N 74047, Evidence No. PA07596-73. This typical grey cast iron microstructure consists of the graphite flakes in a

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redominantly pearlitic matrix. No evidence of

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idmanstatten graphite is observed.

Magnification: 88.SX

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Photo ID No.: PA07596-DW3-2-17-88

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'K Figure 4. Higher magnification photomicrograph of

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raphite flakes and predominantly pearlitic matrix of the ase sample removed from EDG 18.

Magnification: 446X

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Photo ID No.: PA07596-DW4-2-17-88