ML20011A543
| ML20011A543 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Callaway, Sterling, 05000484  |
| Issue date: | 03/13/1978 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Arthur J, Bryan J, Dienhart A, Koester G KANSAS GAS & ELECTRIC CO., NORTHERN STATES POWER CO., ROCHESTER GAS & ELECTRIC CORP., UNION ELECTRIC CO. |
| Shared Package | |
| ML20011A456 | List:
|
| References | |
| NUDOCS 8110130536 | |
| Download: ML20011A543 (6) | |
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Distribution w/ enclosure:
MAR I 31978
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~=3 Docket Fiies OELD
.. c NRC PDR IE (3) local PDR H. Smith LWR #3 Fiie D. Vast, allo SCC:
F. Williams J. Buchanan, NSIC
M. Rushbrook Da xet I;os. SOI 50 -462, ri 50-483, S':N 50-484, Ci 50-485 and S2150-486 Cnica Electric C m y
.J. J. K. Bryan 1;crthern States Power Cc :arry
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r'ni: Pr. A. S. Dienhart Dsineariq & Construction P. C. 3cx 149 Vice Presidsnt - I:;inearlsg 414 :licellet la' ll St. Lcuis, ?.issouri 63166 "irra*-M is, Minnesota 55401 h% ster Gas & Electric Corporat'".W1 M. John Arthur Kr.sas Gas & Ilectric Cocpany m:
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Pz. Glenn L. Koester Chief En7ineer ii9 East Avenue Vice President - Cceratiens Z...
W ter, Sew Ycrk 14649 201 Merd Market Street
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Wichits, Kansas 67201 Cantiecen:
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.sn miwus Fi.JaCS By letter, dated Pecruary 13, 1977, fr= Nicholas A. Petrick, the SCIPS stilities requested that we c:::nfir= t e design require::c=ts for the he.i contairsent structure, as disc -=w held on January 23, 1978, between represe::tatives of tne CW"%'s
.at a meeti:q staff and the A-~PPS utilities an:i t.%ir c::ntractors.
Ole specific is: R:e for stich the Fecruary 13, 1978 letter recuested resclution concerns tne mini =cm cocerete cover ovt outer face of the cectainment ' structure.
reinforcinq steel en the the SliUPPS PSAR refers to BC-Fe-5 s.l.:n states that the miniu::::For this mini =um cca: rete cover snall be two inenes.
At the Ja=uary 23 1978 meetig,
ye.:r representatives stated that this mind:cm cover can, be reduced cv construction tolerances.
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ebcaester Gas & S1e'ct.-ic Corporation MAR 13 IN Northern States Fo.er Co.,pany T.ansas Gas 5 Electric Cccgany IJe nave c =pleted our evaluatien of the inforr.ation presanted in the Fecruary 13, 1978 letter ar.d the results of our evaluation are presented in the I r.losure. As nated in the Enclosure, we reaffim cur pcsition, as presented at the Januarygl978 T.ecting, that the 2.iniuec concrete cover over reinforcing stee.1 en tne cucer face of the ccntain nnt structure shall be no less than two irc.nes.
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Please advise us if ycu hsw any cuestions concerning our evaluation. -
Sincerely, Original Signed by, O. D. Part Olan D. Parr, Chief Lignt Water Prama Branch Iio. 3 Division of Project P,anage:nent Erc.lcscre:
As Stated t---
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Crange & Rcckland Utilities, Irg:.
Gerald Churoff., E.aq.
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r.r. D. H. Barnes, Jr..
m Senior Vice Presif.,ent-Shaw, Pitt: en, Sotts, Treweridge-r
& M.s$ den ~~ -
75 West Route 59 1500 M Street, Nr W.-
S;:eing Valley, New York. - 10977 Washirrg2::c,.D..C. ;20026
...e.s Central Et.iw Gas & Electric F.r. Williac. E. Griffin l
Corporation Assistant Attorney General l
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P.r. Charles A.. Bolz State of. Kansas.
Vice President State Deuse Engi,eering & General Sve.
T:geka, Kansas 66612 284 South Avenue Pougnkeepsie, New Ycrk 12602 Niagara Mocawk Power Corporatica
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Arvin E. Opten, Erq.
Mr. G. Rb:de, Vice President-I45ceuf, L:ct, Leiby & M.r.3ae Engineeri:q 1757 N Street, N.ii.
300 Erie 3culevard, West Syracuse, New Y0rk 13202 hashi. v c, D. C.
20036 Kansas City Power & Light Coccaa.y Ed.iard G. Collister, Esq.
A:"!i: Mr. D. T. McPhee-Collister & Yxesenroeder 1203 Iowa Vf.ce Presidct 1330 Baltimre Ave ~2e
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ENCLOSURE
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STAFF EVALUATION OF THE Q
DESIGN CRITERIA FOR SNUPPS PLANTS CONTAINMENT In a letter to E. G. Case dated February 13, 1978, the applicant has submitted informaton in support of its contention that the reinforcing steel cover for the concrete containment may be a minimum of 1-1/3 inches and a maximum of 11-1/2 inches.
The basic issue is whether the minenta and maximum reinforcing steel cover specified by the code may De altered by placement tolerances.
The applicant has presented the following arguments in support of its '
position:
The design and placine drawings conform to the minimum ar.d (1) maximum cover recuiremer.s as specified in BC-TOP-5A which is referenced in the SNUPPS PSAR. These are the same re-quirements as specified in CC-3534 and CC-3535 of Division 2 of the ASME B & PV Code.
However, the applicant claims that the tolerances permitted by Section 3.8.1.6.6.1 of the PSAR allcw variations in the minimum and maximum values.
(2)
A reference to the ACI Commitee 224 Report has been cited
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that states "the cracking mechanism in two-way action slabs and pl ates is controlledr..- only to a smail" extent
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magnitude of the concrete cover". Furthermore, they note i
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that the containment is crestressed which will minimize the potential for tny'signifitart cract opening.
(3)
They have performtd calculations' ih accordance with Referenc'?
2 as cited in their letter that. demonstrates that there will be sufficient.,bonc' developmentvwittreamhnhr.um cmer77f Mt?' ^** '-d inches.
(4)
Imposition of more stringent requiremerts will necessitate revi sion of-the cevsforci ngs steel cetsit-drawingsT"thus-*s--= ae-(
l forcing recesign of the containment.
The staff has reviewed the aaplicant's submittal and the referenced cocuments and has crawn the following conclusions:
i (1)
The minimen and maximum covers specifiec in BC-TOP-5A are controlling for both design and construction. The specified cover shoulo be appropriately modified to accommodate the I
placing tolerances stated in Section 3.8.1.6.6.1.
The reaff notes tnat its position is consistent with a code interpretation made by the Working Group on Design of Section III, Division 2, of the ASME B &
P'.
Code.
As ncted by the applicant, this interpretation was not supported by the Subgroup on Materials,
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Construction and Examinaton and inerefore has not been resolved within the code committee. Howe,or the staff feels that the i
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Working Group on Design should have tne jurisdiction on this matter.
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(2) The applicant's reference to ACI Committee Report 224 does not present any conclusive evidence regarding the absolute minimum cover requirements for corrosion protection.
It is a'so noted that the same report states that for beams and one-way slabs "the thickness of the concrete cover is an important variable, but not the only geometric consideration".
(3) The applicant has not presented the calculations that demonstrate there will be sufficient bond development with a -
cover of 1-1/3 inches. Their conclusion does not appear to De consistent with the conclusion in Reference 2 which states:
" Comparison of current provisions for development length with the propos*d design recommendations shows that for minimum cover current provisions are unconservative".
(4) The staff does not believe that its interpretation of the cover requirements will have a significant cost impact on the appolicant. An increase in the specified cover may necessitate a drawing change, but it should not require a redesign of the containment.
If a change in the depth of r section is a concern, it could be accommodated by a tightening of the placing tolerances.
It is nJted that the applicant's placing tolerances are greater chan tnose specified.in both. ACI.318-Il and ACI 349-74.
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(5)
The staff is also concerned that the applicant's interpretation of cover. recut.remertts. caul 4Jesu.l.t.in -a sover-as sma41-as m--
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1/2 i nch for the mechanicak connec-tors vsed wi:th-418 oarse " ~ e -
In conclusion, *he# staff s ;Usi'tioris~tne same as that stated-in the January 23, INS. meeting wi tA.the-appl-icantw.,il.t:::is,.summanue6,aef.o.Mos: 62 m.
a 1.
The staff considers that the commitmen* of a 2-inen minimum concrete cover for the concrete containment, as made in Section CC-3533.1 of Accendi x 4
.c. BC.-TIP..5.fm J6. thecughsJ8.,m.infor.cir.g stee.boc.rascl.s,~
t both design ano construction.
The value is a minimum, meaning that the absolute minimum cover to assure corrosion control in the actual construction snall not be less than 2 inches. The staff expect, for Callaway, Unit #1 that by wall lift 76 all reinforcing in si:ei e6 througn el8 will meet this recuirement.
2.
The staff considers that the commitment of a depth of not more than t/5 to reinforcing steel, that is considered face reinforcement as made in Section CC-3534 of Appendix C to BC-TOP-5. controls design and construction.
The value is a maximum as rounced to the next wnele l
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inch, meaning the absolute max" mum depth in order to provide surface crack control for the concrete containment. The staff expects for Callaway, Unit #1 that by wall lif t #6 all face reinforcing will meet this requirement. The staff will consider special cases on this recuirement where necesssary wall Diockouts may recuire local variations to the maximum depth to face reinforcing..
3.
The staff considers items 1 and 2 to apply only to the concrete -
containment as incicated Dy the applicant's commitments. ACI 318-71 provisions, as committed to by the applicant, will govern requirements ~
similar to these for the other Category I structures.
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ATTACHMENT 7
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