ML20126D045

Ro:On 800404,investigation of Manufacturer Std 1/4-inch U Bolt,Used on vendor-designed Pipe Supports for 3/4-inch Class a Pipes,Revealed Overstress During Seismic Event. Caused by Design Error.Affected Supports Will Be Redesigned

ML20126D045
Person / Time
Site:	Sequoyah
Issue date:	04/07/1980
From:	Ballentine J TENNESSEE VALLEY AUTHORITY
To:
References
NUDOCS 8004150408
Download: ML20126D045 (1)

Text

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P.crert ed o'".%r Technical Specificetien 6.9.1.12.1 h \\ O k;I a

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4/4/00 Tire of Occurrence:

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'k c,o q) l' nit 1 in !!?de 6 with all fuci Icaded.

c.o t.a birnt I f f ent Icet enel P _ c r $ r t i,en, of,,0c etir rence f rve rs i. vrmier (rP.") derigar.d pipe supporte that eurport 3/4-inch class

'A' r.'r-irca a 1,rrar tret.cro pire vere derIrned ut311rJnc a vnnuf acturers t t. m frir a I /'i-im b t'-belt.

Ittveetiratien he.n c.bevn th tt thin 1/4-inch U-bolt fa ja81rfr'n,1 dr~.:Jrge.even rt rerred c'ttrf or, a seir-f c event bnrrd on the leadingM chown on the ter ! ~1t C t'-a of 0 c.9trence P m ? cn etter - Uccier.cr ueed incerrect eeirnic leadings in the dcrign of the ritrezto.

IT.c decirned the U-bolt in the Icwer (3/4-inch) pire as an anchor -

t"t it S,e in' c"ded te be uacd ate a 2-vny loteral rest raint f t

__"_..r tr3 rted Partits th v *t Ce r r e e_ t t ve' 1:c t 1"n Tr+"n or T1onned

'I F af f ected r"r nete ore bef vc revieved by S T nnd EDS cugineers ned will be d"f a"t 1 IFc U-belte en the 3/4-it'eb Pires vill be reonalyced end redcof ned ti to cet ca n 7-v.y 3r'terni et' pre t t.

INd1Cicetien vill be t:ade to the supports in t

t.b e fle d by leve-ning. the brnoch line U-bo3tp ro they provide only lateral r e r t.r air.t.

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