Bimetallic spacer grid
Abstract
Abstract An improved bimetallic spacer grid arrangement for fuel element support in nuclear reactors. A plurality of primary spacer elements are nested with a plurality of secondary spacer elements, the primary spacer elements extending less than one-half the full depth of the secondary spacer elements. Spring ferrules are positioned relative to the primary spacer elements at particular locations within the spacer grid arrangement for retention therebetween. The primary and secondary spacer elements are formed from a first material having characteristic low neutron capture cross section while the spring ferrules are formed from a second material having better stress relaxation properties than the first material.
Inventors
- 👤 Andrew J Anthony
- 👤 Albert L Gaines
- 👤 Donald M Krawiec
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |