ML20116K947

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Forwards Info Re Ablation of Inner Steel Plate & Fill Concrete
ML20116K947
Person / Time
Site: 05200001
Issue date: 10/06/1992
From: Fox J
GENERAL ELECTRIC CO.
To: Poslusny C
NRC
References
NUDOCS 9211180102
Download: ML20116K947 (5)


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4 Allation ofInner Steel Plcre and Fill Concrete Reference. Bechtel Stmetural Design Report. Tables SS-1I and SS-12 Per table SS-12 the pedestal cument design margin fin faulted conditions is 33% in the shell plates and 25% in the stillher plates. In addition, the SSE forces and moments at this section (3ce table SS-1 l) are roughly 25% of the loads on the pedestal base. This gives without SSE a 50% rnargin Ihr the pedestal When the ablation of the pedestal happens, no SSE is assumed, therefore, providmg at least 50% margin With the ablation, the temperature induced moments will reduce as the effective thickness of the stiffners I

decrease. All strains from temperature induced loadings will be selflimiting The only need for stifTner plate is to prevent the outer shell from buckling. For all of these calculations, the concrete till has been neglected.

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OCT 06 '92 re:49/t16 E lO;LUP D.M J.

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m TABLE SS-12 (1 OF 2) ifl-STEEL STRESSES IN THE REACTfL- <EDESTAL

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AT SECTIONS 7 & 9 1

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Section:

7

' S G-Lc0ation: REACTOR PEDESTAL NEAR FOUNDATION MAT E

m i SHELL PLATES STIFFENER PLATE h

ELEMENT CALCULATED ALLOWABLE CALCULATED ALLOWABLE LOAD NUMBER' AZIMUTH STRESS STRESS STRESS STRESS REMARKS

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(ksil (ksii (ksil (ksil 15 301 180 15.86 41.4 11.93 25.3

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' <[T J)NSACTION K REPORT >

10-06-1992(TUE) 11;45

~C -RECEIUE' 3 NO, DATE T!W DESTINATION 5 ATION PO.

DURAT10N t100E

. RESULT 8061 10-06 11:43 408 9251667 4

0*01'13' NuRM.E OK 4

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