ML19210A557

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Preliminary Rept on Examination of Crystal River 3 Decay Heat Pump Shaft
ML19210A557
Person / Time
Site: Crane, Crystal River  Constellation icon.png
Issue date: 09/12/1977
From: Rovder J, Sarver L
METROPOLITAN EDISON CO.
To:
Shared Package
ML19210A556 List:
References
NUDOCS 7910300596
Download: ML19210A557 (20)
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Text

~

To:

K. E. Moore,:IPGD Fr'om:

L. W. Sarver ', J. S. Rovder, ARC September 12, 1977 PRELI'CIARY REPORT 0I EXA CIATION OF CR-3 DECAY HEAT FUMP SF E Stat enent of Findinq This report ecvers preliminary results of =etallurgical evaluation of a broken CR-3 decay heat pu=p shaft (Florida Power Corporation). Results were cbtained via visual and optical microscopy examinatien, micro-sectioning and optical metallegraphy, hardness testing on shaft cross sections, and by scanning electron microscope examination of the fracture surfaces.

The vesults of examinations to date suggest that fracture may have originated in the root of the shaft keyway (en a lineal locus along the shaft axis) then subsequently propagated frc= several secondary initiation sites en several planes inclined to the shaft axis. Fracture initiated roughly at the point of coincidence of an over sleeve en the shaft. The shaft appeared to be tightly-fit into the sleeve.

The initial crack area was crystallographic in appearance and thus differed significantly frc= subsequent beach-narked crack surface areas; the latter appeared to be representative of a progressive (fatigue) crack pro-pagation process but the original crack process which produced the crystallo-graphic surface is not known.

No gecretric or material abncr=alities were observed at the crack crigin site.

1491 195 2910800 7f, Fraccographic analysis showed cracking to be predominantly transgranular in character but showed also some mixed integranular and transgranular fractures; scme of the latter mixed character was observed near beach markings. Inter-granular fracture character did not appear to be associated with the origin of cracking. The significance of the intergranular f racture mode is not known.

Substantial damage was sustained along some portions of the locus of the crack origin, so complete fractographic analysis was precluded.

Hardness was noc found to vary substantially through the shaft cross section (Rockwell C 31.5 to 35). Lowest values were recorded near the key-way.

Hardness values appeared to be generally consistent with an H 1150 heat treatment (which produces Rockwell C 33 hardness) far 17-4 PH alloy - the shaft material.

Metallographic analysis revealed a microstructure containing essentially tempered martensite - as expected for H 1150 heat treatment of 17-4 PH alloy (i.e., the result of the solution heat treatment, air cool, and tempering heat treatment).

Longitudinal microsections revealed what appeared to be some residual elongated ferrite grains; the significance of this characteristic is not known.

The results and findings stated are preliminary. It should be kept in mind that limited time was available to do this work. Virtually no back-ground information was supplied, so we have no case history upon which to build a failure analysis. We will continue to complete the program set out by J. A. Gorman but more information is needed for us to do an adequate analysis.

1491 196 Preliminary Results: Documentation

- Apoearance of Broken Shaft -

Figures 1-4 depict the broken shaf t as observed at 90 rotations about its own axis.

Figures 5-7 illustrate the crack origin area at the keyway root. A subsurface crack, hidden from view in figures 5 (lef t) is exposed in Figure 7.

Figures 8-10 and 11-13 illustrate various aspects of both sides of the totally through-wall crack.

Figures 14-15 illustrate both sides of one of the nearly - through -

vall crack surfaces which was forced open for viewing.

- Fractography -

Figure 16 illustrates a portion of the locus of crack initiation at the root of the keyway. Figures 17 and 18 illustrate details near the origin.

Figure 19 shows the crystallographic character which generally typifies the fracture surface at the origin (Refer also to Figure 7).

Figures 20 and 21 shew two different beach-markings from a secondary propagation system, as for example indicated by arrow in Figure 9 or Figure 15.

Figures 22-24 illustrate growth character proceeding the last beach mark while figure 25 illustrates growth character beyond the last beach mark (f ast growth).

The mixed-mode conditions shown in Figure 24 occurred near a beach mark.

- Meta 11ography -

Microstructure of the shaft is shown in Figures 26-29 (Transverse section) and in Figures 30-33 (longitudinal section). Microstructure close to the keyway is illustrated in Figures 34-37.

1491 197

- Hardness -

Rockwell C hardness surveys from transverse and longitudinal sections of the shaft are reported in Figure 38.

1491 198

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