IR 05000295/1982006
| ML20041F680 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 02/28/1982 |
| From: | Norton J, Williams C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20041F678 | List: |
| References | |
| 50-295-82-06, 50-295-82-6, 50-304-82-06, 50-304-82-6, IEB-80-11, NUDOCS 8203170293 | |
| Download: ML20041F680 (4) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION III
Report No. 50-295/82-06(DETP); 50-304/82-06(DETP)
Docket No. 50-295; 50-304 License No. DPR-39; DPR-48 Licensee: Commonwealth Edison Company P. O. Box 767 Chicago, IL 60690
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Facility Name:
Zion Units 1 & 2 l
Inspection At:
Zion Sits, Zion, IL Inspection Conducted: February 17, 1982 d C N$k'%
Inspector:
J. F. Norton
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Approved By:
C. C. Williams, Chief Plant Systems Section
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i Inspection Summary Inspection on February 17, 1982 (Report No. 50-295/82-06; 50-304/82-06(DETP))
Areas Inspected:
Licensee action relative to Bulletin No. 80-11, " Masonry Wall Design". The inspection involved a total of eight inspector-hours by one NRC inspector.
Results: No items of noncompliance or deviations were identified.
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DETAILS
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Parsons Contacted Commonwealth Edison Company (CECO)
- K. Graesser, Plant Superintendent
- J. Reiss, Principal Engineer D. Wozniak, Principal Engineer Nuclear Regulatory Commission
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Kohler, Senior Resident Inspector J. Richards, Secretary Functional or Program Areas Inspected The licensee's action on IE Bulletin No. 80-11, " Masonry Wall Design" was reviewed.
Licensee responsibilities include identifying all masonry walls supporting or proximate to safety-related hardware attachments, equipment, and/or syste'es, describing the safe.ty-related hardware attachments, equip-ment, and/or systems, describing the safety-related components, and re-evaluating the structural integrity of the walls under certain postulated loading conditions. Also, operability of. jeopardized safety-related systems are to meet the applicable technical specification action statement.
A plan outlining repair priorities is required, scheduling structural modi-fication first on the most seriously jeopardized walls. The primary pur-pose of this inspection was to verify completeness and thoroughness of the wall and equipment survey and determine if requirements are addressed commensurate with-the spirit and intent of the Bulletin.
1.
General The 180-day final report addressing Bulletin requirements was prepared by Sargent & Lundy Engineers and issued November 6, 1980. A total of 222 masonry walls were identified with approximately 100 having safety-related ramifications.
The Region IIT inspector examined selected walls. This survey was accomplished in the company of one of CECO's principal engineers.
Drawings were che:ked for specific information such as penetrations, loading points, piping and electrical cable proximity and other considerations impacting structural quality and safety.
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A review of the report addressing Bulletin 80-11 was accomplished.
Details are contained in the following pages of this report.
2.
Identification and Description Approximately 12% of the 222 walls were individually examined by the Region III inspector. The licensee's re-evaluation of the 100 walls
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having safety-related ramifications (wall attachments or proximate equipment) revealed approximately 20 walls would sustain overstress under the postulated loading conditions.
Licensee determinations indicate that failure of any of the 20 walls will not affect oper-ability of any safety-related system.
3.
Re-evaluation of Structural Integrity The licensee scheduled an appropriate re-evaluation program in accord-ance with the following:
Priority Description
Walls supporting safety-related piping, 2 1/2" diameter and greater
Walls supporting other safety-related items (small piping, cable trays; ducts, conduits, etc.)
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Walls in vicinity of major safety-related equipment
Walls supporting non-safety related items
Walls with no attachments The Franklin Research Center (FRC), Philadelphia, has been retained by the Structural Engineering Branch of NRR to perform the technical evaluation of the licensee's re-analyses. FRC will issue an Interim Technical Evaluation Report (ITER), then a final TER. FRC's schedul-ing for Zion Units 1 and 2 is July 13, 1982 and October 6, 1982 for completion of the ITER and TER, respectively.
4.
Description of Walls Masonry walls for Zion Units 1 and 2 have not been included as part of the shear wall system for Category I structures, and the majority of the masonry walls have been used as non-load-bearing walls. These walls have been relied upon primarily as interior walls, either for shielding or fire protection requirements or merely as partition walls and have been separated from the floor above by a gap.
These walls have also been provided with control joints on the sides capable of transferring shear forces normal to the plane of the wall.
Concrete masonry walls have been constructed as single or multi-wythe hollow, grouted, or solid block walls with full mortar bedding of the units, using running bond construction. No cavity wall construction has been allowed. Wythes have been bonded together by full mortar collar joints and by continuous ladder type reinforcement which overlaps the adjacent wythes every second course.
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5.
Report Review The licensee's final report addressing Bulletin requirements was reviewed by the Region III inspector. The report is complete and thorough and adequately addresses the concerns of Bulletin No. 80-11.
Pertinent survey data is appropriately documented in an orderly manner
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in the report. No conflicts were discerned between actual field and reported conditions, as documented in the licenace report.
6.
Wall Modifications Structural modifications for the potentially overstressed walls are being accomplished. The licensee's scheduling estimates completion of modifications June 1, 1982.
7.
Exit Interview The inspector met with licensee representatives (denoted under Persons Contacted) at the conclusion of the inspection on February 17, 1982.
The inspector summarized the pu pose and findings of the inspection.
The licensee acknowledged the findings reported herein.
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