ML20214G532
| ML20214G532 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/05/1974 |
| From: | Maccary R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| CON-WNP-0053, CON-WNP-53 NUDOCS 8605220257 | |
| Download: ML20214G532 (4) | |
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i Responethle RP Breech and Pswject Manager: IJERR 1-2, J. OredeN i
Technical Review Drancht MIB (AFCSE and SER are reopending' Sadiviamm11y) l Requested Completion Date: 12/15/74 Descripties of Request: TAR 977 4
teriew Status: Assiting Informaties P
In aceerdense with Technical Assistemte Request No. 977, the report WPPSS-74.
2-R3. "Fuwf.ectiosa Against Pipe Breaks Outside Cenhi====e"e r.-.
.4 by Burns ami Roe, Ime.' has been reviewed by the Mechamiral Magineering Branch, Directorata of Licensing.
The MEB review wee in the following areas.
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1 (a) Itene 1, 2, 3 and 4 of the attachment te the ABC letter'ef December 22, 1972_/
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1 (b) The pipe restraint desian per of item 5 of the =**==h===t to the AEC letter of December 22, 1972-(c) Item A.4 of Appendir A to the AEC letter of July 12, 1973.
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eriterie are addressed in iten 22 of AFFSS-74-2-R3.
I (d) Izemplas 1 thru 4 in Appendix A of WFFSS-74-2-R3, for the mothed of l
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recordaag " General Informaties aequired See w h h of the M fa ts of 1
l a Firing Systat Break Outside Costatement". (The errets isoned by Licensing in Jammary,1973, are facinded by toyliesties.)
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Isote that the subject report makes referesse in a omnber of testeeses to seether VFFSS report, viz. WFFSS-74-3-R1: "Protesties Against F1pe Breake j
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.Inside Caetaineest", prepared by Deres and Rae, los.,Ilarsh 1974.~ Mia I
I report use revissed by the IEEE and,a request fer' addittamal indendMen
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I une'provideS-in a letter dated Asgest 9,13894.4E.1S. ideocary to'W.4.
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' tesseng. This BAI use tresseitted to'the applieset in a letter dated i aognet 29,1974, W. R. Bot 1er es J. J.' Seats.
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essest be=======8u117 enesteded entti entiefeneery sensommes se m
'es our essenets have been eseleseed -$a the seen of-em 31 separe. 'eemoeding
' te verbal e4==tima with the projeetgesager, sospenses from es applicant eay not be, fortheeming metil late Esmeter 1974. r
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Csemente 2 and 3 of the encleeurs to eene entent overlap oesomets spea the j
11 report but are entficiently differest in detail to entrent being etated in the fore used in this requeet.
I OriAn1Ee<1 by R.it. L e n R. R. Maccary, Aseistemt Director i
for Engineering Directorate of Lieomeias I
ec w/ encl:
S. R. Benamer, DETA F. Schroeler, L V. 1. Better, L J. F. Enight, L J. Orndetf, I.
R. J. A.>eaak, L i
S. N. Hou, L i
- 4. E. Willer, L ec w/o esc 1:
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6 MECilANICAL ENGINEERING BuMCil DIRECTORATE OF LICENSING REQUEST FOR ADDITIONAL IhTORMATION WPPSS-74-2-R3: " PROTECTION AGAINST PIPE BREAKS OUTSDE CONTAIN'{ENT" WNP-2, DOCKET NO. 50-397 1.
In the discussion of AEC Iten 2, you quote " alternate rules for determination of postulated pipe break locations" from 2.1.2 of WPPSS-74-2-R1.
State specifically whether these " alternate rules" are intended to apply only to AS!!E Code Class 2 and 3 piping.
2.
In the discussion of AEC Item 3, you quote from the -R1 report para-graph 2.2.1 a procedure for using the ratio of hoop and axial stresses to deternine whether a longitudinal split. or a circunferential break will be considered and you quote your criterica of "no significant s
difference between the hoop and axial stresses" for consideration of both types of break. You should provide a more quantitative criterion.
The staf f considers a stress ratio of 1.5 to be necessary to justify the conrideration of only a longitudinal split or of only a circun-ferential break at a given location.
3.
In the discussion of AEC Item 3, you quote from paragraph 2.2.4 of the
-R1 report in regard to the movement of the free end of a pipe at a postulated circumf erential break. The staff feels that an acceptabic criterion would require that except for movement (such as one diameter lateral displacement) assumed in order to establish a design basis jet
s 2-reaction, pipe whipping should be assumed to occur in a direction which logically results from the effect of the jet reaction upon the piping configuration, including the geometry, strength, and stiffness of the piping and its supports, restraints, and snubbers.
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