ML20042A080

Interim Part 21 Rept Re Radial Shear Reinforcement at Major Containment Penetrations.Analysis of Personnel Lock Under Review.Next Rept Expected by 820604

ML20042A080
Person / Time
Site:	Midland
Issue date:	03/12/1982
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Keepler J, James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-82-577-000 10CFR-50.55E, 16126, 81-05-#4, 81-5, 81-5-#4, PT21-82-577, PT21-82-577-000, NUDOCS 8203230066
Download: ML20042A080 (4)

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Vsco President - Projects, Engineesing and Construction General Officos: 1945 West Parnell Road, Jackson, MI 49201 e (517) 788 045 81-05 #h March 12, 1982 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Cormtission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND PROJECT -

DOCKET NOS 50-329 AND 50-330 SHEAR REINFORCEMENT AT MAJOR CONTAINMENT PENETRATIONS FILE:

0.4.9.53 SERIAL:

16126

References:

J W Cook letters to J G Keppler, Same Subje*. :

(1) Serial 11993, dated May 15, 1981 (2) Serial 12066, dated July 31, 1981 (3) Strial 1h635, dated December 14, 1981 This letter, as were the referenced letters, is an interim 50 55(e) report concerning the adequacy of shear reinforcemrats at major containment l>enetrations. provides a status of the accions being taken to correct the condition.

Another report, either interin or final, vill be cent on or before J un e h, 1982.

l WRB/1r : MCAR 51, Interim Report h, " Shear Reinforcement at Containment Building Major Penetrations," dated March 5,1992 CC:

Document Control DesL, NRC Washington, DC l

RJCook, NRC Resident Inspector Midland Nuclear Plant l

2(1 I

8203230066 820312 PDR ADOCK 05000329 ggR 18 S

PDR

Serial 16126 81-05 #4 2

CC:

CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BSt amiris CRStepnens, USNRC WDFaton, Esq, USNRC EJKelley, Esq, Attorney Gen SHFreeman, Esq, Asst Attorney Gen WHMarshall CJMerritt, Esq, TNK&J

Serial 16126 Bechtel Associates Professional Corporation 81-05 n 061386 061470

SUBJECT:

MCAR 51 (issued 4/21/81)

Shear Reinforcement at Containment Building Major Pene-trations INTERIM REPORT 4 DATE:

March 5, 1982 PROJECT:

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

Background

While examining drawings for the containment shell, it was determined that there is less radial shear tie reinforcement around the equipment hatch, personnel lock, and the emergency airlock penetrations than in other projects of similar design. The design for these areas was com-pleted 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.

Investigative Action Design criteria requirements, existing calculations, and drawings were reviewed and it was determined that a reanalysis of the equipment hatch and personnel lock was required.

The equipment hatch and personnel lock penetrations have been independ-ently reanalyzed with updated finite-element analysis, using a revised model with modified input parameters. Radial shear stresses around ths equipment hatch were found to meet the acceptance criteria.

An analysis of the personnel lock [using the Bechtel Structural Analysis Program (BSAP)] was completed and is being reviewed.

The purge line, emergency air lock, and main steam line penetrations are also considered as major penetrations. The existing main steam line calculations have been reviewed and the shear reinforcement found to be acceptable. The acceptatllity of the shear stresses around the purge line penetration and emergency airlock will be determined based on the personnel lock analysis because these penetrations are smaller in diameter than the personnel lock.

Bechtel Associates Professional Corporation h61470 61300 MCAR 51 Interim Report 4 March 5, 1982 Page 2 Corrective Action Shear stress around the equipment hatch and main steam penetrations have met the acceptance criteria as described above. Upon completion of personnel lock analysis, the need for design modifications, if any, will be established. Results of this analysis will be presented in the next iterim or final report.

SAR Change Notice 2648 has been issued to Consumers Power Company for its review and approval to correct discrepancies in Subsection 3.8.1.5.1.3 of the FSAR. No other SAR changes are required.

Safety Implications If the results of the personnel lock analysis indicate a deficiency in t?:e design, this deficiency could possibly adversely affect the safety of the Midland plant.

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: I

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