ML18058B898

Temporary Non-Code Repair for Pipe Leak/Wall Thinning Downstream of Cv 0826,SWS,Line HB-23-16

ML18058B898
Person / Time
Site:	Palisades
Issue date:	07/01/1993
From:	Bill Rogers CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18058B895	List: ML18058B894 ML18058B896 ML18058B897 ML18058B898
References
EA-SP-03316-05, EA-SP-03316-05-R00, EA-SP-3316-5, EA-SP-3316-5-R, NUDOCS 9307060318
Download: ML18058B898 (25)

Text

{{#Wiki_filter:ATTACHMENT 2 Consumers Power Company Pali sades Pl ant Docket 50-255 PROPOSED TEMPORARY NON-CODE REPAIRS EA-SP-03316-05, TEMPORARY NON-CODE REPAIR FOR PIPE LEAK/WALL THINNING DOWNSTREAM OF CV-0826, SERVICE WATER SYSTEM, LINE HB-23-16" July 2, 1993 ( 9307060318 930701 0 PDR ADOCK 05000255 II P PDR

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____../ As analysed stresses based on the original section modulus (Ref. 7.3) s 11 : = 926 s 12B =2242 s l 2D : = s 11 + 2. ( s l 2B - s 11) - Minimum thickness required to meet Eq. 11 stress limit Stress as a function oft calculated from the ratio of the original section modulus and the reduced thickness section modulus. z orig s(t).= s l r-- Z(t) Solve fort with an initial guess t min =root( s(t) - Sall' t) Sall = 15000 t =0.01 t min =0.022 - Minimum thickness required to meet Eq. 128 stress limit. Solve fort Z orig s(t) := s 12B"-- Z(t) t min:= root( s(t) - Sall' t) Sall := 18000 t min =0.045 - Minimum thickness required to meet Eq. 120 stress limit. Solve fort Z orig s(t) = s 12D" Z(t) S all. = 36000 t min =0.036 Therefore, the Code minimum pipe thickness is governed by the pressure hoop stress t min.:= 0.053}}