ML20008E925

LER 81-008/01T-0:on 810213,determined Spring Can Type Hanger Installed Improperly,Resulting in Overstressed Socket Welded Joint.Caused by Incorrect Design.Hanger Removed & Pipe Isolated & Depressurized.Design to Be Corrected

ML20008E925
Person / Time
Site:	Millstone
Issue date:	02/27/1981
From:	Resetar J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20008E919	List: ML20008E918 ML20008E925
References
LER-81-008-01T, LER-81-8-1T, NUDOCS 8103100510
Download: ML20008E925 (1)

Text

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.e LICENSEE EVENT REPORT _ _

(PLEASC PRINT OR TYPE At.L REQUIRED INFORMATIONI

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EVENT DESCRIPTION Af;O PRCB ABLE CONSEQUENCES h l o 12 ] l Duri.ng routine power operation, an as-built hanger review of the reactor vessel I

, o ,3 j ; head vent piping system determined that a spring can type hanger was installed I

, , , , , ; incorrectly. The improper installation resulted in overstressing a socket welded i

,,,,, , joint.

Failure at the joint would have resulted in a non-isolable RCS l

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lo 171 I I o ta 11 No Similiar LER'S. 83 I

C DE CO E SLCCO E CovPONENT CODE  ! 3: O' E 5 0 8 l 0 l 9]

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10 11 12 13 18 19 20 OCCURRENCE HETORT REVISION SE QUE N TI AL REPOR T NO. COOS TYPE NO.

E% ENT YE AR

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43 lXl919l9lh 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIO*e5 IiIoIi The installation was the result of an incorrect desian. The stressas l l1 1i1 I were reduced to less than allowable by removing the hancer and isolating I

,, ,,,; then depressurizing the affected piping. Until a new design is comDiete. the head I

{ , ,,, ; vent piping and specifically the overstressed joint will remain as is. Additional I hangers have been verified as correct. I 7 8 9

% PCAER OTHER STATUS SO RY CISCOVERY CESCRIPTION STA NA l [fj@l As-Ruiu nrwing him l Ii I 5 l l E l@ l 1 l 0 l 0 l@l ACitvlTV CC TENT OF af tE ASE AUCUNT OF ACTIVITY LCCATION CF RELE ASE NA l li jcl lRE LkASE Dl @ l Z jgl NA l l 80 7 8 9 10 11 44 45 PERSONNE L EXPOOVHES NUve E st TYPE CEste4lF r10N '

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I li in 8l 9l0 l0 l 0l@l 7 11 12 NA 80 LCSS CF CR C AV ACE TO F ACILITY TT*E LESCRIPTION '

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• c IIlIIIIIIIIII,I I 2 I o l lY+ j Press- release on 021381 En@lOESCRIPTION to "The Day" New London. Ct. -1 BJ. ;

68 69 I 8 9 30 Jonn P. 2 Resetar, Jr. P u c.. E 203-447-1791 A L !810 31 o

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