ML20039B301
| ML20039B301 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/14/1981 |
| 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, 14635, 81-05-#3, 81-5-#3, NUDOCS 8112220504 | |
| Download: ML20039B301 (4) | |
Text
4 O Consumers power Jernes W Cook 0
h Vice President - Projects, Engineering and Construction 81-05 #3 General offices: 1945 West Pernall Road, Jackson. MI 49201 e (517) 788-0453 December 1k, 1981 Mr J G Keppler, Regional Director Office of Inspection & Enforcement US Nuclear Regulatory Commission Region III
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DOCKET NOS 50-329 AND 50-330 D E C g 2 IO3f? R g
SHEAR REINFORCEMENT AT MAJOR CONTAIN!ENT PENETRATIONS 01
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Reference:
J W Cook letters to J G Keppler, Same
Subject:
TTi[,A (1) Se -ial 11993, dated May 15, 1981 (2) Serial 12066, dated July 31, 1981 This letter, as are the referenced letters. is an interim 50 55(e) report concerning the adequacy of shear reinforcements at major containment penetrations. provides a description of actions being taken to correct the condition.
Another report, either interim or final, will be sent on or before March 12, 1981.
WRB/lr : MCAR 51, Interim Report 3, " Shear Reinforcement at Containment Bui' "ajor Penetrations," dated November 30, 1981 CC: Director of Office of Inspection & Enforcement Att Mr Victor Stello, USNEC (15)
Director, Office of Management Information & Program Control, USNRC (1)
RJCook, UShPC Resident Inspector Midland Nuclear Plant (1)
DEC y 7 1981 gf gha*188Faa!!$;
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Serial 14635 2
4-81-05 #3
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CC: CBechhoefer, ASLB Panel i
RSDecker, ASLB Panel FPCowan, ASLB Panel I
AS&L Appeal Panel i
JHarbour, ASLB Panel i
MMCherry, Esq MSinclair i
BStr.miris j.
CRStephens, USNRC I
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WDPaton, Esq, USNRC l
j FJKelly, Esq, Attorney General i
SHFreeman, Esq, Asst Attorney General i
WiiMarshall GJMerritt, Esq, TNK&J 6
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"I Serial lh635 05Ii62 Bechtel Associates Professional Corporation 0 $ i i f8
SUBJECT:
MCAR 51 (issued 4/21/81)
Shear Reinforcement at Containment Building Major Pene-trations INTERIM REPORT 3 DATE:
November 30, 1981 PROJECT:
Consumers Power Company Midland Plant Units I 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 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.
Shear stresses around the equip-ment hatch were found to meet the acceptance criteria. The personnel lock shear stress calculations are presently being checked.
a The purge line 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 acceptable. The design adequacy.
of the purge line penetration will be determined through the results of the personnel lock analysis. Review of these penetrations will complete the requirements of MCAR 51.
Corrective Action Shear stresses around the equipment hatch and main steam penetrations have met the acceptance criteria as described above. - Upon completion of the personnel lock analysis, the need for design modifications, if any, will be established.
Results of this analysis will be presented in the next interim or final report.
A SAR change notice 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. It is anticipated that this change will be incorporated in the next FSAR revision. In addition, other changes as a result of this review are in process.
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051162 Safety Implications If the results of the personnel lock analysis indicate a deficiency in the design, this deficiency could possibly adversely af fect 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:
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Approved by:
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