Heat exchange – Expansion and contraction relieving or absorbing means – Relieving or absorbing means supports temperature modifier...
Patent
1987-06-19
1988-09-06
Schmidt, Frederick R.
Heat exchange
Expansion and contraction relieving or absorbing means
Relieving or absorbing means supports temperature modifier...
165162, 376285, F28F 700
Patent
active
047685824
ABSTRACT:
Slots are provided in the wrapper of a nuclear steam generator to increase the local flexibility of the wrapper to allow for the difference in thermal expansion between the carbon steel wrapper and the high corrosion resistant alloy tube support members. The radial structural load paths between the tube support members, the wrapper, and the outer shell provided by the radial support means, about which the expansion slots are provided, are not affected by the addition of the expansion slots. Since the slots are preferably provided by means of a high speed industrial laser, they are very thin and do not permit substantial commingling of cooler downcomer water and the boiling mixture in the tube bundle region. The expansion slots may be vertically or horizontally oriented and may be cut into the wrapper on more than one side of the radial support means. The slots may end in small curved portions to decrease stress concentrations and increase fatigue life.
REFERENCES:
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patent: 3841593 (1974-10-01), Muto et al.
patent: 3850795 (1974-11-01), Thome
patent: 4267020 (1981-05-01), Burack
patent: 4415021 (1983-11-01), Bayless
patent: 4503903 (1985-03-01), Kramer
patent: 4583584 (1986-04-01), Wepfer
Satina Donald M.
Schmidt Frederick R.
Vaught Bradley I.
Westinghouse Electric Corp.
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