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COMPRESSION SPRING FIG. 52 10. Mechanical shut-off rod for PHWR TOP EXTENSION WELD SHUT-OFF ELEMENT WELD W3 BOTTOM SPRING TOP PROTECTIVE CAP 3760mm 13 WELD W2 B O T T O M PLUNGEP WELD W5 BOTTOM WELD SPRING HOUSING WM Cd-SANDWiTCHED TUBE ASSEMBLY BOTTOM PLUNGEP HEAD FIG. 11. Cd sandwiched tube assembly 53 Cadmium sandwiched with stainless steel was chosen as neutron absorbing element due to high neutron absorption cross section, ease of fabrication and low vapour pressure. Sandwiching is required for augmenting strength.

L :i|, + 100 . 3. Spiral profllometry of lower end ofrodlet with wear but no axial crack or swelling FIG. 4. Penetrating fretting due to wear against a guide card 200mm jlfjji,^ * ' p- . 1' ' /7G. 5. Spiral profllometry showing wear against guide cards 35 FIG. 6 Fretting due to wear against a guide card, irregular shapes due to contact corrosion and/or material loss in both rodlet and guide card 3. SWELLING OF ABSORBER Gamma spectrometry measurements confirm that the neutron dose received by the control rodlets has a very steep axial gradient (Figure 7).

The failure of the ball screws was attributed to lack of lubrication. Al ENCAPSULATION OF Co SLUGS I SPINNING PRESSING I DRILLING I WELDING 2ND PRESSING MACHINING OF SLUGS FINISHED SLUGS LOADING IN Zr-2 TUBES AND RESISTANCE WELDING 1 ASSEMBLY INTO BUNDLES ASSEMBLY OF BUNDLES ON THE EB WELDED CENTRAL SUPPORT TUBE ASSEMBLY FINISHED Co SLUG ASSEMBLY FIG. 8. Steps in fabrication of Co slug absorber assembly A typical problem of NAPS moderator system is a high Co-60 activity coming from adjuster rod ball screws [7].

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Domain Decomposition - Parallel Multilvl Meths for Elliptic PDEs by B. Smith, et al.,


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