ML20053A987
| ML20053A987 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 05/11/1982 |
| From: | Colburn T Office of Nuclear Reactor Regulation |
| To: | Fay C WISCONSIN ELECTRIC POWER CO. |
| References | |
| IEB-80-11, TAC-42896, TAC-42897, NUDOCS 8205270557 | |
| Download: ML20053A987 (8) | |
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11 3-a/6 DISTRIBUTION PDocket File local PDR ORB Rdg Docket Nos. 50-266 D.Eisenhut and 50 301 JHeltemes G
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Y OELO Recs;VED NSIC M Y l 8 Jgg g k" Mr. C. W. Fay I&E (1) I Og Assistant Vice President ACRS (10 Wisconsin Electric Power Company TColburn c, 231 West Michigan Street Gray File
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Milwaukee, Wisconsin 53201 NChokshi 4
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Dear Mr. Fay:
On May 8,1980 NRC issued IE Bulletin 80-11, Masonry Wall Design to 1
all licensees. THs/ bulletin required licensees to identify plant masonry walls and their intended functions and to present reevaluation criteria for the masonry walls with analyses to justify those criteria.
In addition, any licensee proposed-modifications of masonry walls and the proposed methods, trocedures and repair schedules were to be submitted for review and approval.
By letters dated July 18, 1980, November 14, 1980 and December 26, 1980, you responded to IE Bulletin 80-11. After reviewing these responses the staff scheduled a site visit at Point Beach Nuclear Plant to obtain first hand knowledge of the masonry walls at your facilities and to resolve open items in our evaluation of your earlier submittals. The meeting was held on June 9-11 at Point Beach with MRC staff members, Wisconsin Electric personneland your consultants Bechtel and Computech.
Twenty-one action itemsresulted from this meeting. We have reviewed your responses to these action items and find them acceptable.
Our detailed review is contained in the attached safety evaluation (SER) and accompanying technical evaluation (TER) prepared by our contractor, Franklin Research Center. We consider IE Bulletin 80-11 to be fully implemented for your facilities subject to the review and acceptance of a confirmatory plate analysis after modifications on walls 19, 111-1, 11*-3N, 113 and 114 are completed.
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Sincerely, Original signcd by Timothy G. Colburn Project Manager l
0205270sS7,0 Opdrating Reactors Branch #3 Division of 1.icensing l
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WISCONSIN ELECTRIC POWER COMPANY PO' INT BEACH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-266/301 I
SAFETY EVALUATION REPORT
' MASONRY WALL DESIGN' I
l'.0 INTRODUCTION 1.1 PURPOSE AND SCOPE The purpose of this review is to provide a safety evaluation of the Licensee's response to the Nuclear Regulatory Commission's (NRC) IE Bulletin 80-11. " Masonry Wall Design" (1), which required licensees to identify plant masonry walls and their intended functions and to present reevaluation criteria for the masonry
.I walls with analyses to justify those criteria.
In addition, a-y licensee-proposed modifications of masonry walls and the proposed methods, procedures, and repair schedules are reviewed for acceptability. Detailed technical review i
I was conducted by Franklin Research Center (FRC) under a NRC contract and this j
review report is based on their technical evaluation report (Ref. 18) r i
1.2 PLANT-SPECIFIC BACKGROUND
- In response to IE Bulletin 80-11, Wisconsin Electric Power Company submitted I
to the NRC a le.tter with attachments (2) dated November 14, 1980 describing the I
l status of masonry walls at Point Beach Nuclear Power Plant Units 1 and 2.
Reference 2 indicates that the safety-related walls at Point Beach Nuclear Plant are grouped into four categories based on function and configuration as follows:
a.
masonry walls b.
=asonry block-outs in concrete walls
.c.
unreinforced concrete block-outs in concrete walls d.
masonry facings provided for fireproofing arouInd steel building i
colu=ns.
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- l The function of these walls is one or = ore of the following: fire protection, i
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i shielding, room partition, or sec'urity barrier. A total of 65 safety-related walls are located in the auxiliary building, turbine building, and facade I
stairwell. These walls were not intended for load bearing or to form a part of the lateral-force-resisting systems in the buildings where they are located.
On June 9-11, 1981, the NRC representatives met with the Licenses and their consultants to conduct an onsite review and to audit the actual calculations for Point Beach masonry walls. At the end of this meeting, 21 action items were specified (3) requesting additional information from the Licensee. The Licensee has responded to all these action items by submitting detailed calculations and technical reports (4 through 15).
2.0 EVALUATION CRITERIA The basic documents used by FRC for guidance in this review were the Standard
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Review Plan, Section 3.8.4, Appendix A, " Interim Criteria for Safety-Related i
j Masonry Wall Evaluation" (16), developed by the Structural Engineering Brasch i
I (SEB), and ACI 531-79 (17).
3.0 EVALUATION OF LICENSEE'S SUBMITTALS AND WALL MODIFICATIONS l
A detailed study was performed by FRC to provide a technical evaluation of the masonry walls at Point Beach Nuclear Plant Units 1 and 2.
Consideration of the revised criteria used by the Licensee (15), the Licensee's response to action items, and the Licensee's drawings for scheduled wall upgrading led to the conclusions in Sections 3.1 through 3.2 below.
3.1 LICENSEE'S CRITERIA 3.1.1 General Assessment
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The revised criteria used by the Licensee (15) for reevaluating the concrete i
I sasonry walls as outlined in Section 3.1 are, in general, satisfactory since they l
are in conformity with SEB criteria.
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l 3.1.2 Deviations a.
The Licensee assumed an increase factor of 1.67 for allowable tension parallel to the bed joint compared to 1.5 allowed by the SEE criteria for factored loads.
b.
The Licensee assumed an increase factor of 1.5 for allowable shear in shear walls and flexural members compared to 1.3 allowed by the SEB criteria for factored loads.
These deviations are acceptable based on~the high safety margin indicated in the Berkely test results (6) and the Licensee's discussion on page 22 of the 4
revised criteria (15).
1 3.1.3 Acceptability of the Criteria In ganeral, the Licensee's criteria are in compliance with the SEE criteria.
The deviations in the values used for increased factors for factored loads are I
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acceptable in, view of the high safety margins indicated in the results of Berkely tests (6) and the revised criteria presented by the Licensee (15).
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3.2 WALL MODIFICATIONS t
i 3.2.1 Description of the Proposed Modifications, I
j Proposed wall modifications at Point Beach Nuclear Plant are based on the Licensee's evaluation criteria, Since many of these walls were qualified on j
the assu=ption of supported boundaries, proper shear transfer mechanisms had to be installed at the. boundaries. The Licensee proposes clip angles wherever boundary supports are assu=ed, except for the bottom edges. For the bottom f.f edges, the results of the analysis indicate that the sortar shear strength l
alone is sufficient for shear transfer. The drawings provided by the Licensee i
i indicate tb,e chase modifications will be sufficient. The Licensee ha.s proposed to upgrade walls 19, 111-1, 111-3N, 113, and 114 because they are overstressed at present. The Licensee proposes to remove all. masonry block-outs requiring upgrading; the re=aining block-outs will be equipped with
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clip angles along the vertical and top boundaries.
In the case of certain other walls, the loads from piping and equipment will,be transferred to alternate l
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supports.
3.2.2 Stipulation of Additional Modifications The Licensee's proposed wall modifications are acceptable subject to a confirmatory plate analysis for walls.19, 111-1, 111-3N, 113, and 114.
4.0 SAFETY EVALUATION FINDIRGS The use of (1) 'the evaluation criteria defined by applicable codes, standards, and specifications, (2) applicable loads and loading combinations and design and analysis procedures, (3) applicable structural acceptance criteria, (4) materials, (5) quality control, and (6) special construction techniques and testing can provide reasonable' assurance that, in the event of winds, tornadoes, aarthquakes, and various postulated accidents occurring within Category I structures, the safety-related masonry walls will withstand the specified design conditions without impairment of (a) wall integrity or
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4 (b) the performance of required safety functions. Conformance with these criteria, codes specifications, and standards constitutes an acceptable basis for satisfying, in part, the requirements of General Design Criteria 2 and 4.
These safety e. valuation findings form the basis for concluding that IE Bulletin 80-11 has been fully implemented subject to the review and acceptance of the following ites: results of confirmatory plate analysis after modifications for walls 19, 111-1, 111-3N, 113 and 114.
Pri~ cipal Contributors:
n N. Chokshi T. Colburn I
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4.0 REFERENCES
1.
Masonry Wall Design USNRC, 08 May 1980.
C. W. Fay Letter to J. G. Keppler, NRC.
Subject:
180-Day Response to IE Bulletin 80-11, Masonry Wall Design - Point Beach Nuclear Plant, Units 1 and 2 Wisconsin Electric Power Co., 14 Nov. 1980 3.
T. G. Colburn Summary of Site Audit Meeting Held with Wisconsin Electric Power Company Regarding Their Resp'onse to IE Bulletin 80-11,' Masonry Walls USNRC, 01 July 1981 4.
Computech Engineering Services, Inc.
Compressive Strength of Prisms ~and Concrete Blocks Wisconsin Electric Power Co., 00 Sep. 1981 R553.13 5.
Co=putech Engineering Services,.Inc.
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Modal Contribution to Dynamic Analysis Results l
Wisconsin Electric Power Co., 00 July 1981 rj R553.02 6.
Computech Engineering Services, T.nc.
Evaluation of Allowable Tensile S' tresses Normal to the Bed Joint Wisconsin Electric Power.co., 00 Sep. 1981 R553.06 7.
Computech Engineering Services, Inc.
Evaluation of Single Wythe As'sumption to Represent Multiple Wythe Walls Wisconsin Electric Power Co., 00 Sep. 1981 R553.07, Rev. 1 8.
Conputech Engineering Services, Inc.
Evaluation of Allowable In-Plane Shear Stresses and Strains Wisconsin Electric Power Co., 00 Sep. 1981 R553.08 9.
Computech Engineering Services, Inc.
Justification of Using Plate Solution for Wall 3-1/1 Wisconsin Electric Power Co., GO Sep. 1981 R553.09 i
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Computech Engineering Services, Inc.
Evidence of Voting on BSSC Ballot Item SA/46 l
l Wisconsin Electric Power Co., 00 Sep.1981 R553.10 11.
Computech Engineering Services, Inc.
Procedure to Account for Out-of Plane Interstory Drift Effects on the 1
Masonry Wall Evaluation j
Wisconsin Clectric Power Co., 00 Sep. 1981 R553.ll, Rev. 1
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12.
Computech Engineering Services, Inc.
J Assessment of Reinforcement on the Capacity and Behavior of Masonry Walls Wisconsin Electric Power Co., 00 Aug. 1981 R553.04 13.
Computech Engineering Services, Inc.
Comparison Between Finite Element Plate Analysis and One-Way Beam Action Wisconsin Electric Power Co., 00 Sep. 1981.
R553.12 14.
Computech Engineering Services, Inc.
Out-of Plane Drift Effect on Wall 19/9 Wisconsin Electric Power Co., 00 Aug. 1981 R553.03 15.
Criteria for the Re-Evaluation of Concrete Masonry Walls for Point Beach Nuclear Plant, Revision 1 Wisconsin Electric Power Co.,15 Aug.1981 16.
Interim Criteria for Safety-Related Masonry Wall Evaluation l
USNRC, 00 July 1981 l
SRP 3.8.4, Appendix A I
17.
Building Code Requirements for Concrete Masonry Structures American Concrete Institute, Detroit, Michigan, 1979 ACI 531-79 and Commentary ACI-531-R-79 18.
Technical Evaluation Report No. TER-C5506-157, Masonty Walls Design-Point Beach Nuclear Plant Units 1 and 2, dated March 16, 1982, Franklin Research Center.
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j Wisconsin Electric Power Company cc:-
Mr. Bruce Churchill, Esquire Mr. William Guldemond Shaw, Pittman, Potts and Trowbridge USNRC Resident Inspectors Office 1800 M Street, N. W.
6612 Nuclear Road I
Washington, D. C.
20036 Two Rivers, Wisconsin 54241 Joseph Mann Library 1516 Sixteenth Street Two Rivers, Wisconsin 54241 1
l Mr. Glenn A. Reed, Manager i
Nuclear Operations Wisconsin Electric Power Company Point Beach Nuclear Plant i
6610 Nuclear Road I
Two Rivers, Wisconsin 54241 l
Mr. Gordon Blaha Town Chairman Town of Two Creeks Route 3 i
Two Rivers, Wi.sconsin 54241 i
l Ms. Kathleen M. Falk General Counsel Wisconsin's Environmental Decade 114 N. Carroll Street l
Madison, Wisconsin 53703 i
j U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN: Regior.:' Radiation Represer.tative 1
l 230 S. Dearborn Street Chicago, Illinois 60604 i
i l
Chairman i
Public Service Commission of Wisconsin Hills Farms State Office Building Madison, Wisconsin 53702 Regional Administrator 2
Nuclear Regulatory Commission, Region III Office of Executive Director for Operations 799 Roosevelt Road Glen E.llyn, Illinois 60137 i
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