Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Core restraint means
Patent
1995-06-08
1998-04-21
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Core restraint means
376285, G21C 1900
Patent
active
057426538
ABSTRACT:
An apparatus for stabilizing a shroud against vertical and lateral deflection. The apparatus forms a vertical load path by which the shroud flange can be anchored to the shroud support plate. In the tensioned state, an upper support assembly exerts a restraining force on the top surface of the shroud flange which opposes separation of the shroud at any assumed failed circumferential weld location. The apparatus further incorporates upper and lower restraint springs which oppose lateral deflection at the elevation of the top guide support ring and at the elevation of the core plate support ring respectively. The vertical restraint assembly is made of material having a coefficient of thermal expansion which is less than a coefficient of thermal expansion of the shroud material. A desired differential thermal expansion of the vertical restraint assembly and the shroud can be attained by the selection of member lengths and materials having appropriate coefficients of thermal expansion. In particular, the vertical restraint assembly undergoes a thermal expansion which is less than the thermal expansion of the shroud when the reactor changes from a shutdown state to a fully operative state in which nuclear heat is generated, thereby producing a thermal load. The thermal load during normal operation for a shroud with the limiting combination of cracked welds should be designed to provide a net downward load on the shroud.
REFERENCES:
patent: 1366955 (1921-02-01), Schneible
patent: 1425712 (1922-08-01), Stockford
patent: 3445971 (1969-05-01), Desmarchais et al.
patent: 3733760 (1973-05-01), Koerner
patent: 3734827 (1973-05-01), Schilling
patent: 3744660 (1973-07-01), Gaines et al.
patent: 3785924 (1974-01-01), Notari
patent: 3910447 (1975-10-01), Bevilacqua
patent: 3963565 (1976-06-01), Beine
patent: 4047632 (1977-09-01), Schilling
patent: 4262402 (1981-04-01), Cooper, Jr. et al.
patent: 4322880 (1982-04-01), Lampe
patent: 4409179 (1983-10-01), Burger
patent: 4818470 (1989-04-01), Richardson et al.
patent: 4963318 (1990-10-01), Johansson et al.
patent: 5392322 (1995-02-01), Whitling et al.
patent: 5402570 (1995-04-01), Weems et al.
patent: 5406600 (1995-04-01), Jones et al.
patent: 5502754 (1996-03-01), Erbes
Big Rock Point Nuclear Plant Thermal Shield Instability: Part I, Redesign and Test Programs, J.E. Corr, APED-5178, Class II, May 1966.
Big Rock Point Nuclear Plant Thermal Shield Instability: Part 2, Analysis, J.E. Corr, NEDO-13010, 69 NED-33, Class I, Nov. 1969.
Report of Operation of Big Rock Point Nuclear Plant, License No. DPR-6, Docket No. 50-155, Consumers Power Co., (1964).
Yankee Atomic Electric Company, Proposed Change No. 70, Letter to U.S. Atomic Energy Commission, Oct. 15, 1965.
U.S. Atomic Energy Commission, Safety Evaluation of Proposed Change No. 70, Oct. 28, 1965.
Yankee Atomic Electric Company, Proposed Change No. 68, Letter to U.S. Atomic Energy Commission, Oct. 15, 1965.
U.S. Atomic Energy Commission, Safety Evaluation of Proposed Change No. 68, Oct. 28, 1965.
"Applicability of Pipelocks as a Remedy for IGSCC in BWRs", Abel et al., Int. J. Pres. Ves. & Piping, 25, pp. 25-46 (1986).
BWR Owner's Group, BWROG-91028, Apr. 1991, Recommendations on Inservice Inspection of BWR Internal Components & Attachments.
Charnley James Edward
Erbes John Geddes
Kobsa Irvin Raymond
General Electric Company
McGinness James E.
Wasil Daniel D.
LandOfFree
Vertical and lateral restraint stabilizer for core shroud of boi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical and lateral restraint stabilizer for core shroud of boi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical and lateral restraint stabilizer for core shroud of boi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2066191