Patent EP0152207A2 successfully refreshed from Google Patents.
EP0152207A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Retaining pin for nuclear reactor guide tube mounts
Assignee: Westinghouse Electric Corp
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Filing: 1985-01-25
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Granted: —
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Expires: 2005-01-25
Abstract
Abstract A retaining pin mounting assembly for nuclear reactor guide tubes including a pin (16) having a one end portion for disposition within a bore in the upper core plate (12) of a reactor, while the other end (24) is to extend through a bore (22) of the guide tube flange (14) and has a threaded region (30) for threadedly receiving a nut (32) provided with a locking cap (46). The pin has a flange and a shank (24) of a diameter smaller than the bore (22) with guide tube flange (14) and the nut (32) has a skirt (33) adapted to engage the flange (14) and having an inner diameter larger than the shank (24) such that an annular space is formed around the shank. Radial flow apertures 60 extend through the skirt (33) of the nut 32 so as to permit coolant flow through the annular space around the pin shank (24) in order to prevent corrosion by differences in the concentrations of the reactor coolant from that around the pin shank (24).
Inventors
- 👤 John Thomas Land
- 👤 Ronald Jacobs Hopkins
- 👤 Jose Manuel Martinez
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:04
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/334; F; F16; F16B; F16B2200/00; F16B2200/40; F16B2200/403; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
291 words
A retaining pin assembly adapted to be fastened to nuclear reactor control rod guide tube flanges (14) having passages (22) with counterbores (40) each of a predetermined diameter and adapted to a receive a portion of the retaining pin (16), said retaining pin (16) having an intermediate shoulder (26) adapted to be fittingly received in said counterbore (40) for engagement with said guide tube flange, a base section (20) extending axially from said shoulder (26) and adapted to be received in a bore (18) in a member on which said guide tube flange (14) is to be disposed, a stressable shank (24) extending from said shoulder (26) in an axial direction opposite said base section (20) and adapted to be received in one of said guide tube flange passages (22), said shank portion (24) having a diameter smaller than that of said passages (22) such that an annular flange space is formed between said shank (24) and the guide tube flange passage wall, said pin (16) having a threaded stud portion (30) adapted to receive a nut (32) for mounting said retaining pin (16) on said guide tube flange (26), characterized in that said nut (32) has an axially projecting skirt (33) with an inner diameter larger than the diameter of said shank (24) such that an annular nut space if formed between said skirt (33) and said shank (24) which annular nut space is in open communication with the annular flange space when said pin (16) is installed and said nut skirt (33) is seated on said tube flange (14) and that flow apertures (60) are formed in said skirt (33) so as to permit coolant to flow through said annular space around said shank (24) within said flange (14).
Claim 2
Dependent Claim
291 words
A retaining pin assembly adapted to be fastened to nuclear reactor control rod guide tube flanges (14) having passages (22) with counterbores (40) each of a predetermined diameter and adapted to a receive a portion of the retaining pin (16), said retaining pin (16) having an intermediate shoulder (26) adapted to be fittingly received in said counterbore (40) for engagement with said guide tube flange, a base section (20) extending axially from said shoulder (26) and adapted to be received in a bore (18) in a member on which said guide tube flange (14) is to be disposed, a stressable shank (24) extending from said shoulder (26) in an axial direction opposite said base section (20) and adapted to be received in one of said guide tube flange passages (22), said shank portion (24) having a diameter smaller than that of said passages (22) such that an annular flange space is formed between said shank (24) and the guide tube flange passage wall, said pin (16) having a threaded stud portion (30) adapted to receive a nut (32) for mounting said retaining pin (16) on said guide tube flange (26), characterized in that said nut (32) has an axially projecting skirt (33) with an inner diameter larger than the diameter of said shank (24) such that an annular nut space if formed between said skirt (33) and said shank (24) which annular nut space is in open communication with the annular flange space when said pin (16) is installed and said nut skirt (33) is seated on said tube flange (14) and that flow apertures (60) are formed in said skirt (33) so as to permit coolant to flow through said annular space around said shank (24) within said flange (14).
Claim 3
Dependent Claim
18 words
An assembly according to claim 1, characterized in that said flow apertures 60 are arranged opposite one another.
Claim 4
Dependent Claim
38 words
An assembly according to claim 1 or 2, characterized in that said nut (32) has axial splines 36 formed at its circumference so as to be engageable by an axial engagement tool for torquing down said nut (32).
Claim 5
Dependent Claim
46 words
An assembly according to claim 1, 2 or 3, characterized in that said pin (16) has axial grooves (50) formed at its end opposite its base section (50) permitting engagement of said pin (16) for holding said pin (16) when said nut (32) is torqued down.
Claim 6
Dependent Claim
95 words
An assembly according to claim 4, characterized in that said nut (32) has lock apertures (44) formed at its free axial end opposite said skirt (33), and a lock cup (42) is provided and formed so as to fit over the free end of said pin (16) and said nut (32), said lock cup (42) being adapted to be put in place by an axially extending handling tool and having sections adapted to be crimped into said nut lock apertures (44) and said pin grooves (50) for locking said nut (32) to said pin (16).
References Cited (Backward Citations)
No citation records indexed.
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