Multiple standpipe-controlled core hold down mechanisms for fluid-cooled nuclear reactors
Abstract
Abstract In a nuclear reactor core each column 1 is maintained in a located position by an uper and lower support member 3 and 4 respectively, clearances 7 being provided between the columns to cater for bowing therof under irradiation conditions. The upper member 3 may be released fromits column so that said column may be withdrawn from the reactor pressure vessel 2. Groups of columns 1 may have their upper support members 3 connected toa standpipe closure plug so that when the latter is withdrawn from its standpipe 5 the group of columns 1 is released. Preferably the dimensions of the columns 1 are such that any bowing occurring under irradiation conditions is accommodated by the clearances 7.
Inventors
- 👤 A Walker
- 👤 M Williams
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |