ML19270G478

LER 79-010/03L-0 on 790424:surface Linear Indication Found in Weld RA5-CF-13,main Steam to a & B RHR Heat Exchangers & HPCI Turbine.Caused by Welding Error.Defect Removed

ML19270G478
Person / Time
Site:	Cooper
Issue date:	05/23/1979
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19270G476	List: ML19270G475 ML19270G478
References
LER-79-010-03L, LER-79-10-3L, NUDOCS 7906080311
Download: ML19270G478 (1)

Text

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NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 97 > -

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION)

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61 DOCKET NLYS ER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h o 2 lDuring refueling while performing scheduled inservice insnection a surface linear indi-l o a lention was found in weld RAS-CF-13, main steam to "A" and "B" RHR heat exchaneers and I o 4 lHPCI turbine. (T.S. 3.6.G) This portion of the main steam is isolatable. redundant I o s Isystems were available, and failure of the weld had it propagated through wall could I o 6 [have been detected and retained within the secondary centairment. This event nresented I o 7 Ino adverse consequences from the standpoint Of public health and safety. I o a l 80 7 8 9 SYSTEM CAUSE CAUSE C OM P. VALVE -

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JJ 34 J5 36 3' 40 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o ghe subject weld had an area of lack of fusion where the defect originated. The lack I i i pf fusion was only detectable bv radiograph when film and source were lined "" with $c]

g , pngle of the bevel. Material is SA-106 GR-B. 8", Sch. 100. NOP ecual to 1040 psic. I

, 3 l Defect was removed without violating minimum wall thickness. Upon connletion of re- 1 i a l pairs the weld was reexamined per ASME,Section XI.

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