ML19305E821

LER 80-006/03L-0:on 800417,during Analysis of as-built safety-related Piping Sys Per IE Bulletin 79-14,overstressed Condition Discovered in Cooling Sys Piping.Caused by Lack of Support Between Valves Upstream of Juncture

ML19305E821
Person / Time
Site:	Point Beach
Issue date:	05/05/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19305E818	List: ML19305E817 ML19305E821
References
IEB-79-14, LER-80-006-03L, LER-80-6-3L, NUDOCS 8005200474
Download: ML19305E821 (1)

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60 61 DOCK ET NUMBER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0l2] l During seismic analysis of as-built safety related pioina systems in 1

[O l3 i l accordance with IEB 79-14, an overstressed condition in the comoonent l l0 l4 l l cooling system piping was discovered. The hiah stress area was at a l l0 is j l stub end weld which joined the discharge of the two pumps . This iunc- l 1016] I ture has a very large stress inf3pi fication factor which resulted in al 1017l l safe shutdown earthquake condition stress of 45,900 osi. This is l l O la l i greater than the allowable of 27,000 psi but less than the tensile of I ODE CODE S SCO E COMPONENT CODE SU8 CODE SU E B 191 9 9 lW l B l@ W@ l A l@ l P l Il P l E l X l Xl@ l Dl@ l_Z_j @

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l A piping support was added between two valves inst uostream of the l li li j l juncture within a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period af ter discoverv. This supoort reducedI

,si,, l the safe shutdown earthquake stresses to an acceptable value. All I

[t l 3 g l other stresses are also acceptable. This discoverv is reportable oer i g,i4i l the requirements of IEB 79-14 and in accordance with T.S. 15.6.9.2.B.2.1 7 8 9 80 8

STA S 6 POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION li i s l W@ l 0 [ 7 l9 l@l N/A l l C l@lIE Bulletin 79-14 Inspection l ACTivtTY CO TENT RE u ASEo 0,RELEiSE AMOUNT O, ACT,viTv @l LOCATION OF RELEASE @

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1 R 8 9 l 0 l 0 l 0 l@l12 N/A l 7 11 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION lil91[.Z_J@lN/A 7 8 9 to l

80 PU8LiciTY NRC USE ONLY

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y l N j@ DESCRIPTION l N/A l lllllllllllllI F 8 9 10 68 69 80 3 NAME OF PREPARER C. W. Fay PHONE:

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