ML20141K382

Believes That Analysis Should Be Made & Design Justified Concerning Reactor Vessel Repair at Facility

ML20141K382
Person / Time
Site:	Oyster Creek, Three Mile Island
Issue date:	12/20/1967
From:	Etherington H US ATOMIC ENERGY COMMISSION (AEC)
To:	Fraley R Advisory Committee on Reactor Safeguards
Shared Package
ML20091A092	List: IA-91-282, Forwards Written Statement Submitted by Sp Russo for ECCS Subcommittee Meeting on 770129,for Info.W/O Encl ML20141K026 ML20141K047 ML20141K056 ML20141K063 ML20141K066 ML20141K070 ML20141K076 ML20141K082 ML20141K091 ML20141K095 ML20141K121 ML20141K137 ML20141K141 ML20141K153 ML20141K163 ML20141K175 ML20141K185 ML20141K190 ML20141K359 ML20141K365 ML20141K368 ML20141K372 ML20141K375 ML20141K379 ML20141K382 ML20141K386 ML20141K390 ML20141K395 ML20141K398 ML20141K402 ML20141K406 ML20141K408 ML20141K415 ML20141K418 ML20141K423 ML20141K426 ML20141K432 ML20141K436 ML20141K441 ML20141K618 ML20141K620 ML20141K625 ML20141K626 ML20141K630 ML20141K633 ML20141K635 ML20141K637 ML20141K641 ML20141K643 ... further results
References
FOIA-91-282 NUDOCS 9203190089
Download: ML20141K382 (1)

Text

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i Deeember 20, 1961 i $$j 6 3 46, lM.! !

unemuse To .R. F. Fraley, guecutive secretary ACR$

pros t M. stherington Subj ec t: OYSTak CREEK REACTOR YES$st REPAIR I am concerned that the applicant may have been preoccupied with the l aetallurgical character of the stub-tube fatture, to the emelmeten of any attempt to analyse the stresses. The followtas illustretton and j

discueston suggest that stresses say be high.

I think an analysts should be mode, and the destsa justified, before aerely grinding out and repairing erecks. Perhaps such en smalysts is -

under way, but the problee might be worth discussing at the Josuary ACR8 meeting. Also If we are runnlag out of time, you may want to ask the staf f what is being done.

l l

Illustrations several cases should be explored. A staple and optimistic l model to used here to support the contention that stresses in the stub tube may be high.

I The followtas assumptieas are modes

1. The through tube (thtable) and the stub tube are both long. This gives maxinum fleuthtlity and probably a highly favorable stress ,

condition. -

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2. Contreettoa of the weld between the thimble end the stub shaf t eenses L

i e relative radial displacement of 0.001 La. at the weld, t.o., the thimble if stretched radially and the stub tube te pulled radially la for a combined movement of 0.001 in. at the weld. For other displace-weats, stresses are directly proportteaal to displetaseat.

3. The weld contractice enerts no bending soment, i.e. the sad of the stub tube la displaced by inward rotation. This is one liattlag sese.

l- Amether would asswee estal votetton comfornias to that of the thimbne.

t' The probable condition lies between these two outremes, but eleser ta the second. 9

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