US3734825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling and shutting-down pressurized-water nuclear reactor
Assignee: Siemens AG
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Filing: 1971-09-07
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Granted: 1973-05-22
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Expires: 1991-09-07
Abstract
Abstract A dual control member serves to control and shutdown a pressurized-water nuclear reactor and has a control element that includes a plurality of finger control rods secured to a central drive rod through a spider-shaped holder and a shutdown member held by a drive tube surrounding the drive rod and having a separate coaxial spider-shaped holder for a plurality of finger shutdown rods.
Inventors
- 👤 H Schabert
- 👤 H Seibelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:05
CPC Classifications
G; G21; G21C; G21C7/00; G21C7/06; G21C7/08; G21C7/10; G21C7/117; G21C17/00; G21C17/10; G21C17/12; G21C7/12; G21C7/14; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
Device for controlling and shutting-down a pressurized-water nuclear reactor having vertical rod-shaped absorbers displaceable into and out of fuel elements of the reactor core, comprising a dual control member including a control member having a central drive rod, at least one finger control rod means and a first spider-shaped holder securing said finger control rod means to said central drive rod, and a shutdown member comprising a separate second spider-shaped holder disposed coaxially to said central drive rod, and a plurality of finger shutdown rod means carried by said second spider-shaped holder.
Claim 2
Dependent Claim
92 words
Device for controlling and shutting-down a pressurized-water nuclear reactor having vertical rod-shaped absorbers displaceable into and out of fuel elements of the reactor core, comprising a dual control member including a control member having a central drive rod, at least one finger control rod means and a first spider-shaped holder securing said finger control rod means to said central drive rod, and a shutdown member comprising a separate second spider-shaped holder disposed coaxially to said central drive rod, and a plurality of finger shutdown rod means carried by said second spider-shaped holder.
Claim 3
Dependent Claim
36 words
Device according to claim 1, wherein said second spider-shaped holder is located above said first spider-shaped holder, said shutdown member being displaceable upwardly, and being abuttable with said second spider-shaped holder as it is upwardly displaced.
Claim 4
Dependent Claim
19 words
Device according to claim 1, wherein said shutdown member includes a drive tube coaxially surrounding said central drive rod.
Claim 5
Dependent Claim
68 words
Device according to claim 3, wherein said drive tube has an upper end constructed as a hollow magnetic armature, and including an electromagnet coil disposed coaxially to a housing of said control drive for receiving and retaining said armature therewithin in energized condition of said electromagnet coil, said electromagnet coil being de-energizable so that said shutdown member is dropped into the reactor core under the action of gravity.
Claim 6
Dependent Claim
66 words
Device according to claim 3, wherein said drive rod has a lower reinforced end, and said drive tube has a lower end widened to conform to the reinforced end of said drive rod in the vicinity of said first spider-shaped holder so that an upper shoulder formed on said reinforced end of said drive rod entrains said shutdown member in raising condition of said drive rod.
Claim 7
Dependent Claim
43 words
Device according to claim 5, wherein said lower end of said drive tube is formed as a dahspot, a bead-like thickened portion being located at the reinforced part of said drive rod and defining therebetween and said drive tube, a minimum flow gap.
Claim 8
Dependent Claim
44 words
Device according to claim 5 including a spring disposed in said dashpot-shaped lower end of said drive tube and coaxial to said drive rod for braking said shutdown member in falling condition thereof on said shoulder of said reinforced end of said drive rod.
Claim 9
Dependent Claim
31 words
Device according to claim 5 including a spring disposed within a recess formed in the lower end of said drive rod for braking an end piece received telescopically in said recess.
Claim 10
Dependent Claim
23 words
Device according to claim 8 including an additional scales spring located in said recess and yieldable under additional stress by said shutdown member.
Claim 11
Dependent Claim
33 words
Device according to claim 9 including means for indicating the position of a fallen shutdown member comprising a monitor coil indicating the position of said control member when said scales spring is compressed.
Claim 12
Dependent Claim
98 words
Device according to claim 7 including means for indicating the position of a fallen shutdown member comprising an indicator rod resiliently retained within said drive rod and formed at a location thereof above said reinforced end of said drive rod with two pins extending to the outside of said drive rod, a ring member held by said two pins so that said indicator rod is downwardly displaceably by impact of a lower holding ring for said spring disposed in said dashpot-shaped lower end of said drive tube on said ring member in falling condition of said shutdown member.
Claim 13
Dependent Claim
19 words
Device according to claim 11 including a monitoring coil disposed coaxially to the upper end of said indicator rod.
Claim 14
Dependent Claim
34 words
Device according to claim 4 wherein said drive tube is coupled to a catapult spring tensionable upon withdrawal of said shutdown member and having an accelerating effect upon de-energization of said electromagnet holding coil.
References Cited (Backward Citations)
US3625816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |