ML19350A414
| ML19350A414 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/02/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Abel J COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8103160102 | |
| Download: ML19350A414 (10) | |
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MRushbrook ACRS (16) and 50-374 RTedesco SHanauer RVollmer Mr. J. S. Abel TMurley Director of Nuclear Licensing Dross Comonwealth Edison Company
. _RHartfield, MPA Post Office Box 767 OELD Chicago, Illinois 60690 OIE (3)
Dear Mr. Abel:
Subject:
Seismic Category I Masonry Wall.s
.LaSalle County Station, Unit Nos. 1 & 2 In order that we may complete our review for masonry walls, we need your assessment of the differences between your criteria and our interim criteria (see Enclosure) on the impact on the LaSalle masonry wall' e' valuation.. Our position is that for
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LaSalle Unit 1 the license will be conditioned such that prior to start-uo following the first refueling, the differences between our interim criteria and your criteria needs to be resolved and imolementation of the required wall fixes or modifications that might result from such a resolution.
If you desire any discussion or clarification of the infonnation requested, please contact A. Sournia, Licensing Project Manager, (301) 492-7200.
Sincerely, Original signed by Frank J. Miraglia g
Robert L. Tedesco,' Assistant Director for Licensing Division of Licensing
Enclosure:
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Mr. J. S. Abel Director of.fluclear Licensing Cormionwealth Edison Company Post Office Box 767 Chicago, Illinois '6069,0 cc: Philip P. Steptoe, Esq.
' Suite 4200
- One First flational Plaza Chicago, Illinois 60603.
Dean Hansell, Esquire Assistant Attorney General 188 West Randolph Street Suite 2315 Chicago, Illinois sl601
.Mr. Roger-Walker, Resident Inspector U. S. Nuclear Regulatory Commission Post Office Box 224 Marseilles, Illinois 61364
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E!1 CLOSURE SEB IliTERIM CRITERIA FOR SAFETY-RELATED l'.A50!;RY 1lALL EVALUATION e
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. TABLE OF C0!JTEllTS 1.
General Requirements 2.
Loads and Load Combinations a.
Service load Conditions b.
Extreme Environcer'.al, Abnormal, Abnormal / Severe Environmental, and Abnormai/ Extreme Environmantal Conditions 3.
Allouable Stresses 4.
Design and Analysis Considerations 5.
Revision of Criteria 6.
References s
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Geners) P.tquiren:nts The materials, testing, cnalysis, d2sien, construction cnd in:p;ction related to the design and construction of safety-relatcd concrcte masonry walls shall conform to the cppliccble require:2nts contcined in Uniform Building Code - 1979, unless spacified othentise, by the provisions in this cr{teria.
The use of other industrial codas, such as ACI-531, ATC-3 or I:CMA is c1so acceptchie. However, when the provisions of these codas cre less conservative than the corresponding provisions of the interi.m critoria, their use should be justificd on a case-by-case basis.
2.
Locds cnd Load Combinations The loads and load combinations shall include consideration of nor:a1 loads, severe enviror.:2ntal load, extrema environ:antal load, cnd cbnormal loads. Specifically, for operating plcnts the lo:d combinations provided in plant's FSAR shall govern. For operating licen'se cpplications, the follo,:ing load cc:binations shall cpply (for d finition of lo:d ter=s, sco SRP Section 3.0.4.11-3).
(a) Service Lead Conditions (1) D+L
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(2)
D+L+E (3)
D+L+W If thermal stresses due to T, and R, are present, they should be included in the above combinations, as follo.vs:
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D+L+T+R g
(2a)
D+L+T+R+E g
g (3a)
D + L + T + R,+ W g
Check load combination for controlling condition for maximum
'L' and for no 'L'.
(b) Extreme Environmental, Abnormal, Abnormal / Severe Environmental and Abnormal / Extreme Environmental Conditions (4)
D+L+T,+R+E
. g (5)
D+L+T+R+W g
(6) D + L + T + R,+ 1.5 P, (7) D + L + T,+ 1. 2 5 P,+ 1.0 ( Y + Y + Y ) + 1. 2 5 E + R, r
j (8) D + L + T,+ R,+ 1.0 P,+ 1.0 (Y
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- I ) + 1.0 E _
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m In combinations (6), (7), and (8), the maximum values of P,, T,, R,, Y), Y, and Y, including an appropriate dynamic load factor, should be used unless a tima-history analysis is performed to justify otherwise. Combinations (5),' (7) and (8) and the corresponding structural acceptance criteria should be satisfied first uithent the tornr.do missile lor.d in (5) and without 1, Y, and Y in_ (7) and (8).
1.' hen considering these 7
loads, local section strength capacities may be exceeded under these concentrated loads, provided there will be no loss of function of any safety-related system.
Both cases of L having its full value or being completely absent should be checked.
D P00RORGINAl
3 3.
Allowable Stresses Allowable stresses provided in Chapter 24 of UBC-79, as supplemented by the following modifications / exceptions shall apply.
(a) 1: hen wind or seismic leads (OBE) are considered in the leading combinations, no increase in the allcaable stresses is permitted.
(b) Use of allowable stresses corresponding to special inspection category shall be substantiated by demonstration of compliance with the inspection requirements of the NRC criteria.
(c) No tension perpendicular to bed joints of either reinforced or unreinforced masonry walls is allowed, except in the evaluation of unreinforced masonry walls of operating plants. In such cases,
'the allowable values of UBC-79 can be used, if justified by test program or other means.
(d)
For load conditions, which represent extreme environmental, abnormal, abnormal / severe cr.vironmental, and abnormal / extreme environmental conditions the allowable working stresses may be multiplied by the factors shown in the following table:
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TYPE OF STRESS FACTOR (1)
Axial or Flexural Compression 2.5 Bearing 2.5 Reinforcement stress except shear 2.0 but not to exceed 0.9 fy Shear reinforcement and/or bolts 1.5 Masonry tension parallel to bed joint 1.5 Shear carried by masonry 1.0 Masonry tc7sion perpendicular to bed joint for reinforced masonry 0
for unreinforced masonry (2) 1.0 Notes (1) When anch.or bolts are used, design should prevent facial spalling of masonry unit.
(2)
See 3 (c).
4.
Design an'd Analysis Consideraticas (a) The analysis should follow established principles of engineering mechanics and take into account. sound engineering practices.
(b) Assumptions and modeling techniques used shall give proper considerations to boundary conditions, cracking of sections, if any, and the dynamic behavior of masonry walls.
(c) Damping values to be used for_ dynamic analysis shall be those for reinforced concrete given in Regulatory Guide 1.61.
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- (d) In general, for operating plants,the seismic analysis and Category I structural requirements of FSAR shall apply. For other plants, corresponding SRP requirements shall apply.
(e) The analysis should consider both in-plane and out-of-plane leads.
(f) Interstory drif t effects should be considered.
(g)
In new construction, no unreinforced masonry wall is permitted, also all grout in concrete masonry walls shall be compacted by vibration.
(h) For masonry shear walls, the minimum reinforcement requirements of ACI-531 or ATC-3 shall apply.
(i) Special constructions (e.g. multiwythe, composite) or other items not covered by the code shall be reviewed on a case-by,-case basis for their acceptance.
(j) Licensecs or applicants shall submit QA/QC inforaation, if available, for staff's review.
In the event, QA/QC information is not available, a field survey and a test program revieaed and approved by the staff shall be implemented to ascertain the conformance of masonry construction to design drawings and specifications (e.g. rebar and grouting).
(k) For masonry walls requiring protection from spalling and scabbing due to accident pipe reaction (Y ), jet impingement (Y ) and missile impact r
3 (Y ), the requirements of SRP,3.5.3 shall apply. Any deviation from Te SRP 3.5.3 shall be reviewed and approved on a case-by-case basis.
P00R ORlGINAL
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. 5.
Revision of Criteria The criteria will be revised, as appropriate, based on:
(a) Design review meetings with the selected licensees and their A/E's.
(b) Experience gained during review.
(c) Additional information developed through testing and researches.
6.
References (a) Uniform Building Code - 1979 Edition (b) Building Code Requirements for Concrete Masonry Structures ACI-531 - 79 and Commentary ACI-531R - 79.
(c) Tentative Provisions for the Development of Seismic Regulations for Buildings - Applied Technology Council ATC 3-06.
(d) Specification for the Design and Construction of Load-bearing Concrete Masonry - HCKA August,1979.
(e) Trojan Nuclear Plant Concrete Masonry Design Criteria Safety Evaluation Report Supplement - November,1980.
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