ML20023B187

Interim Deficiency Rept Re Adequacy of Shear Reinforcements at Major Containment Penetrations.Sar Change Notice 2648 Incorporated in FSAR Revision 41.Next Rept Will Be Sent by 830318

ML20023B187
Person / Time
Site:	Midland
Issue date:	12/17/1982
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, 19119, 81-05-#7, 81-5-#7, NUDOCS 8212270126
Download: ML20023B187 (5)

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CORSumerS power James W Cook Company v,- ~,an, - ~se,one-,

and Constmetion General offices: 1945 West Parnell mood, Jockeon, MI 49201 e (517) 7s&O463 December 17, 1982 81-05 #7 1

Mr J G Keppler, Regioncl 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 REINFORCEMENT AT MAJOR CONTAINMENT PENETPATIONS FILE:

0.4.9.53 SERIAL:

19119

References:

J W Cook letters to J G Keppler, Same

Subject:

(1) Serial 11993, dateo May 15, 1981 (2) Scrial 12066, dated July 31, 1981 (3) Serial 14635, dated December 14, 1981 (4) Serial 16126, dated March 12, 1982 (5) Serial 17511, dated June 4, 1982 (6) Serial 17598, dated August 31, 1982 This letter, as were the referenced letters, is an interim 50.55(e) report concerning the adequacy of shear reinforcements at major containment penetrations. provides a status of the actions being taken to correct the condition.

Another report, either interin or final, will be sent on or before March 18, 1983.

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JWC/WRB/lr : MCAR 51, Interim Report 7, " Shear Reinforcement at Containnent Building Major Penetrations," dated December 2, 1982 CC: Document Control Desk, NRC RJCook, NRC Resident Inspector Washington, DC Midland Nuclear Plant b

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' " B212270126 821217 l PDR ADOCK 05000329

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DEC 2 0 E82 OC1282-0016A-MP01

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2 Serial 19119 81-05 #7 CC: CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq. USNRC FJKelley, Esq. Attorney General SHFreeman, Esq. Asst Attorney General WHMarshall GJMerritt, Esq TNK&J l

OC1282-0016A-MP01

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Scrial 19119 82-05 //7 6 9 6 58 (Bechtel Associates Professional Corporation 096510

SUBJECT:

MCAR 51 (issued 4/21/81)

Shear Reinforcement at Containment Building Major Penetrations INTERIM REPORT 7 DATE:

December 2, 1982 PROJECT:

Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Description of Deficiency The discrepancies discussed in this report concern the amount of radial shear reinforcement provided around the containment building major penetrations.

Summary of Investigation and Historical Background

Background

While examining drawings for the containment sheil, it was determined that there is less radial shear tie reinforcement around the equipeent hatch, personnel lock, and the emergency air lock penetrations than in other projects of similar design. The design for these areas was completed in November 1973, the drawings for the equipment hatch were issued for construction in July 1974, and the containment walls for Units 1 and 2 were constructed in 1976 and 1977.

Investigation Design requirements, criteria, existing calculations, and drawings were reviewed and it was determined that reevaluation of penetrations for the equipment hatch, main steam line, personnel lock, purge line, and emergency air lock was required.

The equipment hatch penetrations have been independently reanalyzed

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using a more detailed finite-element model than that used in the original design.

Shear stresses around the equipment hatch satisfy I

acceptance criteria.

The main steam line penetration calculations have been reviewed and the shear reinforcement was found acceptable.

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Bechtel Associates Professional Corporation 96586 MCAR 51 0$6$jQ INTERIM REPORT Page 2 The personnel lock penetration was reenalyzed using a finite-element model using elastic, uncracked section properties. The shear stresses for the primary loading condition of 1.05D + F + 1.5PA where D is dead load, F is prestressing force, and PA is accident pressure, have been found acceptable. Under the primary and secondary load combination that includes accident temperature "T " (1.05D + F +

A A + T ), two 50-degree segments at the top and bottom of the 1.5P A

penetration for personnel lock were found to be overstressed. This analysis was a linear clastic analysis, which takes no credit for stress redistribution or thermal stress relaxation.

In a meeting with consultants, it was determined that an elastic analysis using the cracked section properties of certain elements to represent the actual structural behavior would be conducted. This analysis would consider stress redistribution and thermal stress relaxation. This analysis is in progress sud, when complete, will be reviewed by the consultants.

i Upon completion of the review of the personnel lock penetration analysis, the acceptability of the purge line and emergency air lock penetrations will te determined.

Analysis of Safety Implications No deficiencies bave been found under FSAP loadirg conditions that could adversely affect the safety of the Midland plant.

Corrective Action SAR Change Notice 2648 was issued to Consumers Power Company to correct discrepancies in FSAR Subsection 3.8.1.5.1.3.

This SAR change notice was incorporated in FSAR Fevision 41.

An additional SAR change notice to include applicable equations for punching shear is being i

written and will be submitted to Consumers Power Company by February 1983. The need for further corrective action will be determined after completion and review of the anlysis.

Probable Cause Not applicable P

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096586 Bechtel Associates Professional Corporation MCAR 51 096510 INTERIM REPORT Page 3 Reportability This condition was reported to the NRC by Consumers Power Company as "potentially reportable" under 10 CFR 50.55(e) on April 17, 1981.

Submitted by:

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S. Sobkowski Civil Structural Group Supervisor Approved by:

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E.M. Htigh'e s

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Ann Arbor Project Engineer y [ UWi*

Concurrence by:

T.E. J nson Chief Civil Engineer Concurrence by: (___-

M N

E.H. Smith Engineering Manager Concurrence by:

y M.A. Dietrich J

Project Quality Assurance Engineer 0916a l

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