ML20067C911
| ML20067C911 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/03/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 19106, 82-12-#1, NUDOCS 8212100273 | |
| Download: ML20067C911 (6) | |
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CORSum8fS P0wer James W Ceek C0mpany vi,,e,,,u
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December 3, 1982 82-12 #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR C0 GENERATION PLANT -
DOCKET NOS 50-329 AND 50-330 SHEAR LUG DESIGN FOR EMBEDS FILE:
0.4.9.68 SERIAL:
19106 This letter is an interim 50.55(e) report regarding the design of steel embedments in concrete that use shear lugs located in tension zones. This concern was reported to Mr D Hunter of your staff on November 5, 1982.
The attachments to this letter provide a description of the investigation and corrective actions being taken with regard to this subject.
Another report, either interim or final, will be sent on or before March 1,
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JUC/WRB/lr Attachments:
(1) Management Corrective Action Report MCAR-1, Report No 63, i
dated 11/10/82 (2) MCAR-63. Interim Report 1, dated November 29, 1982 CC: Document Control Desk, NRC Washington, DC l
RJCook, NRC Resident Incpector Midland Nuclear Plant 8212100273 821203 PDR ADOCK 05000329 g %g S
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Attach ent 1 OUALITY ASSURANCE PROGRAM Serial 19106 MANAGEMENT CCRRECTIVE ACTION REPORT 82-12 #1 MCAR1 093902 REPORT NO.:
63 JO8 NO.:
7220 ONO.:
DATE:
11/10/82 The N fn tk N UeT N hsidered that shear lugs accommodate all shear stresses and that tension bars accommodate tension stresses. The ACI 349 cod'e issued August 1979 specifies that shear lugs in embedment designs shall be considered effective only in compression zones. The concern is that shear lugs located in tension zones =.ay not be effective, resulting in a nonconservative design and possibly impacting performance of its safety function. There is no commitment to ACI 349 in the Midland FSAR.
RECOMMENDED ACTION * (Optionsi):
1.
Determine if the embedments are satisfactory as designed through additional analysis and testing as required.
2.
If the design is not satisfactory, identify affected embedments by location and provide the necessary corrective actions.
3.
Determine the root cause and take appropriate action to preclude recurrence.
4.
Issue an interim report by 11/19/82.
REFERRED TO:
U Engineering O Construction O OA Management O
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ISSUED BY:
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Attachm:nt 2 Serial 19106 Bechtel Associates Professional Corporation 82-12 n
SUBJECT:
MCAR 63 (ISSUED 11/10/82)
Design of Steel Embedments That Use Shear Lugs Located in Tension Zones INTERIM REPORT 1 DATE:
November 29, 1982 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report addresses a concern with the design of steel embedmente in concrete that use shear lugs located in tension zones.
B,ackground ihe ACI 349 Code, Appendix B, issued August 1979, specifies that shear lugs in embedment designs shall be considered effective only in compression zones. Some Midland embedment designs, which were completed and installed before this date, considered that shear lugs accommodate all shear loads and that tension bars accommodate all tension loads. Other than ACI 349, Appendix B, no known design code or industry standard issued before ACI 349, Appendix B, restricts the design of embedments using shear lugs.
For embedments within the scope of this MCAR, the Midland Final Safety Analysis Report, Section 3.8, is committed to design reinforced concrete according to ACI 318-63 and 318-71, and structural steel according to the AISC 1969 edition; however, these codes do not directly address embedment design.
Investigative Action Presently, all embedments within the scope of this MCAR are being identified and located.
A review criterion is being developed that will address the concerns regarding shear lugs located in tension zones.
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B@chtel Associates Professional Corporation MCAR 63 Interim Report 1 November 29, 1982 Page 2 An investigation is under way to determine if the embedments used in the Midland plant are satisfactory as designed by means of additional analyses, and if required, testing.
If an existing embedment design is found to be unsatisfactory, the embedment will be identified by location and necessary corrective measures will be taken.
Probable Cause The potential deficiency was identified following the issuance of ACI 349, Appendix B.
The root cause is that, before the issuance of ACI 349, Appendix B, this possible failure mode was not recognized by codes or industry standards.
Corrective Action No corrective action has been established at this-time. The results of the investigation will determine any required corrective actions.
Analysis of Safety Implications The concern is that shear lugs Incated in tension zones may not be effective and that this may result in a nonconservative design. The design may be nonconservative to the extent that it may not be capable of performing its required safety function.
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Bechtel Associates Professional Corporation MCAR 63 Interim Report 1 Novembe r 29, 1982 Page 3 Reportability This concern is considered potentially reportable in accordance with Title 10 of the Code of Federal Rcgulations, Part 50.55(e).
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Submitted by:
S.L. Sobkowski Civil / Structural Group Supervisor ll0
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Approved by:
E.M. Ilughe's Q Ann Arbor Project Engineer Concurrence by:
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E DP/U T.E. Jolmson Civil Discipline Chief i
Concurrence by: r'
_ u u.L E.II. Smit'h Engineering Manager A
Concurrenceby:[M.A.Dietrich Project Quality Assurance Engineer 0909a