ML20235B748

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Requests Analyses Needed to Determine Consequences of Postulated Pipe Failure Outside of Containment Structure. Info on Plans to Revise Design of Facility to Accommodate Postulated Failures Also Requested If Necessary
ML20235B748
Person / Time
Site: 05000000, Zimmer
Issue date: 12/18/1972
From: Giambusso A
US ATOMIC ENERGY COMMISSION (AEC)
To: Dickhoner W
CINCINNATI GAS & ELECTRIC CO.
Shared Package
ML20235B311 List: ... further results
References
FOIA-87-111 NUDOCS 8709240215
Download: ML20235B748 (5)
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.)0048 r18 DEC 181972 D:cket No. 50-358 The Cincinnati Gas & Electric Company ATTH: Mr. W. H. Dickhonor Vice President P. O. Box 960 Cincinnati, Ohio 45201 Centlemen:

The Regulatory staff's continuing review of reactor power plant cafety indicates that the consequences of poetniated pipe failures or:: cide of  !

the containment structure, including the rupture of a main steam or feed-water line, need to be adequately documented and analyzed by licenseco and applicants, and evaluated by the staff as soon as possible. Criterion No. 4 of the Commission's General Design critoria, listed in Appendix A of 10 CFR Part 50 requires that:

" Structures, systems, and components important to safety shall j be designed to accotstodate the effects of and to be compatible I with the environmental conditions associated with normal opera- l tion,snaintenance, testing and postulated accidents, including j loss-of-coolant accidents. These structures, systems, and com- 1 ponents shall be appropriately protected against dynamic effects, l including the effects of nissiles, pipe whipping, and discharging fluids, that may result from equipment failures and from events and conditions outside the nuclear power unit."

Criteria Nos. 40 and 42 of the previous (1967) issue of the Cocunission's General Design criteria reficcted similar requirements.

Thus, a nuclear plant should be designed so that the reactor can be shut- '

down and maintained in a safa shutdown condition in the event of a postu- {

isted rupture, outside courninment, of a pipa containing a high energy fluid, including the double ended rupture of the largest pipe in the main j steam and feedwater systems. Plant structures, systems, and components -

important to safety should be designed and located in the facility to accommodate the effects of such a postulated pipe failure to the extent 4 l necessary to assure that a rafe shutdown condition of the reactor can be

' accomplished and maintained.

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h Cincinnati Gas & glectric Company 2 DEC 181972 l

1 Based on the information we presently have available to as on the Zimmar i

.e Nuclear Power Station, we understand that the main steam and feeduatar 14=== run in a reinforced concrete tunnel from their containment penetre-tions.to their terminal points. The main steam line has one seismic

restraint in the tunnel but no 11 ass have restraints against pipe whipping.

Venting of the discharge fram a postulated pipe rupture is prwFided from the' tunnel to either the turbine building or reactor building.

Although it appears that the plant design is capable of withstanding the affects of a postulated rupture in the steam or feedwater lines, we request that you provide us with analyses and other relevant information needed )

1 te determine the conse.q=aae== of such an event, using'the guidane.m provided j in the emelosed information request. The enclosure represents our basic information requirements for plants now being constructed cr.operatins. -

Teu should deterrim the cppliechtlity, fer the Zircr IScien h, e h ' :a, of the items listed in the enclosure. 4 If the results of your analysea irdicata that changes in the design of .

structures, systems, or components are necessary to assure safe reactor i,

shutdown in the event this postulated accident situation should occur, i please provide information on your plans to revise the design of your facility to accommodate the postulated failurce described above. Any design modifications proposed should include appropriate consideration of i the guidelines and requests for informat.ies in the anciosure.

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l We will also need, as soon as possible, estimates of the schedule for 1 design, fabrication, and installation of any modifications found to be necessary. .Please inform us within 7 days after receipt of this letter )

when we may expect to receive an sagndment with your analysis of this postalsted accident situation for t)is glauner Nuclear Power Station, a description of any proposed modifications, and the schedule satinates described above. Sixty copies of the amendment should be provided.

A copy of the Comunission's press announcement on this matter is also )

encloced for your information.

Originalsigned by A. Giambusso A. c1==hueso, Deputy Director for taaetor Projects

.,. Directorate of Licensing (See next page) omce . ,.

sJumne . ._ . . . . . . - .

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l The Cincinnati Gas & Electric Company 3 DEC 18'1972 Distribution:

bras Docket File As stated-ACRS (16) cc Troy B. Cenaar, Jr., Esq.

MC PDR

.A. Giambusso Raid & Priest R S. Boyd 1701 K street, N.W.

Washington, D.C.- 20006 H.

y RP neading I Mr. W4114mm J. Moran Vice President and General Counsel L Reading The Cincinnati Cas & Elaetria Co. BWR-2 File P. 0. Box 960 J. R. Buchanan, ORNL  ;

Cincinnati, Ohio 45201 R '

C D. Knuth, L:RS (2) )

!!r. John !!. Inc!me? . R. Tedesco, L:CS-(2)

Vice President ~- ^

Columbus and southern Ohio Riectric Co. l 215 North Pront Street "

Columbus, Ohio 43215 Mr. W111fmn G. Porter, Jr. ,

Porter, . Stanley, Traffinger & Platt  ! {

37 West Broad street <

j Colassbus, Ohio 43215 1

Mr. Robert B. Killen Fraaidant J The Dayton Power & Light Co.

P. O. Box 1034 Dayton, Ohio 45401 Mr. Julfan de Bruyn Kops  !

General Counsel The Dayton Power & Light Or. '

l P. O. Box 1034 -;

Dayton, Obie 45401 '

Clermont County Library >

Third and Broadway streets Batavia, olds 45103 i 1

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orrect . ...L tBWR. 2. 'ADI WRa.. ..DDfR 7.

Suel :ew .JFSt RSBoy A busso -

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Distribution:

Docket File ACRS (16)

AEC PDR' R.S.Boyd J.F.Stolz H. Smith RP Reading L Reading .

. Doak No. 50-358 ,

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ocC D.Kn , L:RS (2) d co, D CS'(O The Cine ti Gas & Electric Company .

ATTN: Mr. . H. Dickhoner Vice esident . Giambusso-P. O. Box 960 Cincinnati, Ohio- 45201 Gentlemen:

The Regulatory staff's outinuing review of reactor pover plant safety ,

indicates that postulate (pipe failures outside of the containment strue-ture, including the rupturg of a main steam or feedwater line, may not have been adequately evaluated and documented. Criterion No. 4 of the Commission's Ceneral Design Criteria, lia'ted in Appendix A of 10 CFR 50 requires that:

i

" Structures, systems, and e \ 'nents important to safety shall be designed to ecommodate the effects of and to be compatible with e enkronmental conditions associated with normal ' ration, ' maintenance, testing, and postulated acciden , including \ 1oss-of-coolant accidents. Thesestrctures, systems (andcomponents shall b's appropriat y protected against dynamic effects, includin the effects of missiles, pipe

' whipping, and di harging fluids that ma'y, result

-from equipment ailures and Nom, events and conditions outside the n lear power unit."

Thus, a suelea laat should be designed so that the eactor can be shutdown and intained in a safe shutdown condition {in the event of a postulated r ture, outside containment, of a pipe containing a high soorgy fluid, including the double ended rupture of the largest pipe in the main 4 team and feedwater systems. Plant structures, systems, and componepts important to safety should be designed and locat in the faci 14ty to acconsodate the effects of such a postulated pipe ailure to the estent necessary to assure that a safe shutdown condition of the remporcanbeaccomplishedandmaintained.

krequestthatyouprovideanalysesandotherrelevantinformatio ed to determine the consequences of such an event, using the gu dance j rovided in the enclosed general information request. The enclosure '

venemmenen nur hamin (afnemari m reauframanen for clants now beine con-

,g(r' acted. For those plants aco in the design stage, the guidelines and s f Inf #Vistf6s"fsiisEitu"id"th'e iiE:T6ssff"&h'6Gris"E66sideHI"in~tharpista /

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'The Cincinnati Gas and Elaetric Company .

of the resmits of your evaluation indicate that thanges in the d, ign '

tractures, systems, or components are meessaary to assure safe a

rose or shutdown, .please provide information on your plans to p'e vise the desi of.your fseility to secommodate the postalsted failured described I above. Any design modifications proposed should imelade a 'opriate consider tion of the guidelines and requests for informati in the ,

emelosures We will al ed, as soon as possible, estiastes of t)fe schedule for design, fabrichties, and installation of any modifications found to be necessary. Flesiae infora as withia 7 days after reekipt of this letter when we any aspectxto receive your amendment descr ing any proposed "

modifications.

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\ A. Gf abesso, Deputy Director Resetor Projects s

.eetorate of Licensing i Raelosures As stated as: Troy B. Commer, Jr., Esq. Clermont County Library Reid & Friest Third'and Broadway Streets 1701 E 5treet, N.V. n. Bstaviax chio 45103 Washington, D.C.

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Mr. W1111me.G. Forter, Jr.

Mr. William J. Nor Forter, Sta ~ , Traffinger

' Ties Presidest .

and Flatt General C 37 West Bread s set The Cinefama Oss and Columbus, Ohio $215 Elastria Company F.O. Een Mr. Robert B. Kill Frasident Cineiamat . Ohfe 45201 The Dayton Power and Light Company [

Mr. W. laskeep F.0. Bos 1034 i

Vise esident e Dayton, Ohio 45401 Co as and

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sthern Ohio Elaetric Company Mr. Jm11am de Bruya Kops 215 Berth Front Street General Counsel

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columbus, Ohio 43215 The Dayton Power and u _t . , _ _ .

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