ML20235C407
| ML20235C407 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Oyster Creek |
| Issue date: | 05/27/1987 |
| From: | Lear G Office of Nuclear Reactor Regulation |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| Shared Package | |
| ML20234C970 | List:
|
| References | |
| FOIA-87-40 NUDOCS 8707090408 | |
| Download: ML20235C407 (6) | |
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N U e t.E A R REGULATORY CO f.it.11S SIO :3 i
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Docket No. 50-219.
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19 Jersey Central Power 5 Light Company ATTN: Mr. 1. R. Finfrock, Jr.
p)I Vice President - Gencration
'UM Madison Avenue at Punch Bowl Road y
Morristown, New Jersey 07060
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Gentlemen:
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OYSTER CREEK NUCLEAR GEXERATING STATJON,' UNIT 1 3
RE:
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Your letter dated August 1, 1975, referenced a report entiticd, " Mark I Contaima0nt Status Report", dcted July 31, 1975, prepared by the F.g Concral Electri;; Company (CE). Based on our, revie:. cf the GE stutus MQ report, we find that we need additional inforention to conplet; our b;f cvaluation. The information required is listed in the enclosure.
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For your inforr.ation, a copy of the enclor.ure was scat by telecopy to !!r. T. Kecnan, Yanhec Atonic Electric Company C:ar', I 0..ncrs Group
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coordinator) on September 9, 1975.
In addition,is t of the concerns d
listed in the ene)osure have been the sub.ieet of dio,mssionn betueca the liRC staf f and GE.
Tt is anticipated.thr.t the res;ances to the Bj enclosure wil) be presentt.d.in the fit.c.) report of toe Mark I short tcyn progrna scheduled to be issued at the end of Sept cuber,1975, 4
with the exception of the tuo items noted as long tern program items.
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.s, Picase contact us if there is any additional information needed J!R regarding our regnest.
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This request for gencric inforr.ation was approved by GAO under a
}f blanhet clearance nu:dier-D-IS0223(R0072); this clearance expJres di July 31, 1977.
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Sincercly, N
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George Lear, Chief
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Operating Reactors Dranch "3 Divisien of Reactor Licensing y
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Enclosure:
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Request for Additional A
Information
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8707090408 870527 F.)
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' Jersey Central Power 6 Light Company -2 <
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G. F. Trowbridge, Esquire The Honorabic 11. M. Mason.
l Shaw, Pittman, Potts, Trowbridge G Madden Mayor, Lacey Township Barr Building P. 0.. Box 47S
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Forked River, New Jersey OS731 l
11ashington, D. C. 20006 Jersey Central Pouer.G Light Company Honorable Inn. F. Hyland J
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NITH Mr. Thomas M. Critt: ins, Jr.
Attorney General 1
' Safety and Licensing '!anager State of New Jersey j
GPU Service Corporation
- Stato llouso Annex i
260 Cherry liill Road Trenton, New Jersey 05601 Parsippany, Neu Jersey 07054
.l Anthony 2. Roisman, Esc,uire Mr. Paul Arbestan 13crlin, Roisman G Kessler Environmental Protection Agenc-l 1712 N Street, N. 1l.
Region 31 Office L
11ashington, D. C. 20036 26 Federa'i Plar.a New York, New York 30007
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Paul Rosenberg, Esquire i
Daniel'Rappoport, Esquire Ocean County Library 2323 S. IIroad Street 15 llanpor Avenue Trc:ston, New Jersey 00610 To:::s River, New Jersey OS753 Honorabia Jor.eph 11. Ferraro', Jr.
Deputy Attorney General State of~New.lersey Division of Law - Roon 316 Newark, Ncu Jersey 07102 s
i llurtis 11. l!orner, Esquire Stryker, Tams and Dil1 55 Madison Avenue Morristown, New Jersey 07960 I
George F._Kugler, Jr.
Attorney General State of New Jersey Stato llouse Annex Trenton, New Jersey OS625 4
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STNIUS 1:170i6 y
JULY 31,. 1 W/ 5 STRilCTURAL 1U:C1NUERING. QUES'rIONS AND POSITIONS.;
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- 1. - On Page 1 of the report a statencnt is made'that "the Mark'I contninnents will maintain their function during the most probabic course of the LOCA
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event or during S/R. valve discharge".
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The expression "most probable course of,LOCA event" should be I
defined and ' justification should be provided to substantiate the 3
exclusion or reduction in t,annitude, if any, of individual or i
j combined LOCA cficcts if the "most probabic courso..." is Icss d.
severe than the worst possibic LOCA crent.
.b.
The bases for the exclusion of S/R valve discharge londs fro:.i-tho. short; tern program have not been presented in this report.
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Provide a thorough discussion of S/R valve discharge loads and a
address the following. points:
p 1) the possibility of co;.:bining S/R valve load,s with other pool' dyn::ule loads, i
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M' 2) the possibility and structural consequences of the S/R valve d'
discharge loads occurring near the end of n LOCA event after a rise in. pool temperature, 3
3) t he negative pressure-resisting capability of various structures si designed priunrily for positive poof pressure, including the liner plate of concretc thrk I containments, n
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4) the possibility of exciting the resonant frequency of the (1
ovaling or breathing nodes of the to' us, or other dynamic r
19 inodes of other structures within the pool, U
da 5) during the life of the plants the tuimber of oscillations
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anticipated to occur above and below the el:istic limit, with i supporting low cycle and high cycle fatigue analysis for affected structurcs, and (long. term program item) e
- 6) the load-resisting capability of various structures when subjected 4
of S/R valve discharge loads (long term program item).
to e LOCA near the end of the plant life after numerous cycles 6w
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The results and conclusions presented in items "a",'"b" and "c" at q
the top of page 4 are not substantiated in the report. The mthcaatical modcIs and methods of analysis for items "a" r.nd "'" are briefly discussed n
s a.9 in the letter from G. L. Gyorey to R. Naccary dated June 26, 1975.
I[j The structural capability of the ring headcr and vent pipes after failure j
of the column assembly has not been provided in either report.
For all
[g structural analyses referenced in the short term program provide the 31 fol]owing:
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a.
a descr.iption of the mathematical codel used in the analysis j.
including justification for the boundary. conditions and a dir.ctssion
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of the cot:putation of rotational and transnational spring constants, o(:
4, b.
a description of the rcthods of analysis enployed,. including IE1 reference to established co:tputer codes, types of cleuents used, inclusion of shear deferrations, and non-linearities, b
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a justification for simplifying assu.aptious cade in the analyses, t
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the bases for input load data and material properties, and 2
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a prer.entation of results and conc 3 union, s.hich inc]ude ilQ 1) location and ungnitude of excessivo stres.e s or deformations y
4 r critical clerents, and b
2) the.instification that such c.s:cessive stresses will not result f.f in loss of function of the containment or other sfacty-related 1
systems.
Include the ntrain rate effects, the acecptabic
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ductility ratior., the margins of safety, the degree of conservatism, physical tests, crack control, effects on F
]caktightness,... etc.
y 3.
A discussion of the five basic groupin3n of kark I plants is presented lq on page 5 and detailed in Tabic 3.
Describe the bases' for seiceting th'c typical plant from cach group for an in depth analyses.
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Full scale hardware tests and strain rate material tests are referred Q
to within.the report.
Describe the test procedure, detasi simplifying R
assumptions, compare the r.aterial used for.the t est with that used in j
the plants, justify the use of static t'sts for dy.::mic and cyclic e
p loading pheno nenon, and con. pare the test resu?ts uith static finite
- f c1cment analyses.
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On Page 12 and 13, the fundamental ircquency of the ring.hcader assembly is specified as 20112.
Provide the details and procedurcs of analysis l
hhich Icad to the establisicaent of this value.
Can higher nodes of the ring headcr a::sembly, its componest parts or other structures within l
the torus.be excited by pool dynamic loads?
6.
For the downcomer lateral lot'd analyses., specify the number of cycles expecte? to result in the inclastic behavior of any element of the downconcr-header assembly and justify the int'c2rity of this assenbly by perforning a low cycle fatigue analysis.
1 7.
Present diagrams which detail the distribution of the resultant do. nuard l
and upward forces on the torus, presented on Page 17.
In the analysis of toras supports the following should also be considered:
seismic Joads in combination with dead, live and pool dynv.;ic loads; the integrity-of 1ctural bracing, diagonals, etc.; column buckling; and the integrity of the stiffening ring and column connections.
S.
"Acceptab]c strain limits" are referred to on Page 17.
Define these linits, and justify tlair use for both steci cnd reinforced concrete axial, shear and bending deformr tions.
.9. The sp.cial considerations of subparagraph NE' 3131.2 of Subscetion NE of the M.'E b G PV CoJe,Section III, restrict yielding to locali: cd areas.
Specify those pool dyn:uaic loads which produce only such local yiciding..
10.
In the section entit]cd " Screening Analysis" on Page 18 several
" insignificant" loads arc Jisted.
Specify whether or not any of these ]nads could occur in couhination with the primary significant pool. dynamic loads and, if so, what would be their percentare contribution.
11.
On' Page 18 a statement is: nade that " Vent headers can handic fallback loads oven if lateral coltans are assumed to buckle".
Provide a description of the analysis which technically supports the above statement.
Include a discussion of the buckling analysis of these columns.
In addition, demonstrate that after the potential failure of these columns due to fallback loads, the remainder of the 1.0CA loads can still be resisted.
12.
In support of the data presented on the screening analysis, provide justification and shotches for any element in which stresses exceed the clustic limit, in particular, the vacuum brer,kers and the relief valve line over the pool.
Specify the safety nnd scismic classification of those elements and provide justification that the failure of the element would not cause Joss of either the containment or the emergency core coolinr. system function.
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- 13..On Page 20, n. comparison of other plants to the reference plant assued a parabolic pressure tire pulse with a peak of 17 psi and a duration
~of 20' raillisc : ends. Justify these val.ucs in Jight of the apparent
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discrepancy with data presented on Page 13.
14.
Provide justification for the use of r. dynn:aic load factor of 1.3 cnd a dynacic all.r.;nble strc ss increase factor of 3.4 as presented in the comparison of other p):.nt. to the reference p).',nt, pages 20 and 23.
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15.
Pruvide a dis ussion of the analysis of the vent pipe bc1]o.cs assctbly I
which demonstrates its integrity when r.ubjcetc.J to large defor:ar.tient.
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perpendicular to its axir. of primary c :pansion.
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