ML19261E980

Forwards Evaluation of Met Ed Rept on Containment Bldg Ring Girder Const & Repair.Repaired Ring Girder Will Withstand Design Loads,Provided Strict QA Is Enforced During Repair

ML19261E980
Person / Time
Site:	Crane
Issue date:	11/06/1972
From:	Maccary R US ATOMIC ENERGY COMMISSION (AEC)
To:	Deyoung R US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7910171032
Download: ML19261E980 (3)

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Docket Filn: 50-269 0g

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A dt Docket No 50-289 hCV 6 1972 R. C. DeYoung, Assistant Director for Pressurized Water Reactors Directorate of Licensing METROPOLITAN EDISON COMPANY, THREE MILE ISLAND NUCLEAR STATIO;i, UNII J1, RING GIRDER REPAIRS - STRUCTURAL EVALUATION (TAR-30)

Plant Name: Three Mile Island #1 l

Licensing Stage: OL Docket Number: 50-289 l

3 ranch and Project Manager Raquesting Assistance: PWR #2, H. Schierling l

Requested Completion Date: November 10, 1972 Technical Review Branches Involved: Structural Engineerin;; 3 ranch Description of Request: Reviev of repairs of the contain=cnt do.:c ring girder Review Status: Preliminary TAR-30 (Partial)

In accordance with your request the information submitted by the subject applicant with respect to the containment docie ring girder in the report j

entitled " Containment Building Ring Girder, Construction and Repair,"

t dated December 1,1971, and in the addenda to r.his report dated Janaary 21,1972 (not numbered); June 30, 1972 (#2); Augus t 23, 1972 (#3);

and September 22, 1972 (#4) has been reviewed and evaluated by the Struc-tural Engineering Branch, Directorate of Licensing. An evaluation of the information submitted to date is attached hereto.

I R. R. Maccary, Assistant Director i

for Eng,incering j

Directorate of Licensing i

Enclosure:

Structural Evaluation for Three Mile Island, Unit 1, Ring Girder ec w/o enc 1:

ec w/ encl:

A. Giambusso, L S. Hanauer, DRTA i

W. MacDonald, L J. Hendrie, L f,

K. Kniel, L L. Shao, L l

H. Schierling, L A. Gluckmann, L 1486 005 omer >

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Form AEC-stb (Rev.9-53) AECM 0240 o u s cove =NeeENT s=mNtw or*<a 197z -4ss cis 791017103Q g

a THREE MIIX ISLAND UNIT NO.1 Docket No. 50-289 STEDCIURAL ETALUATION OfsW ON CONTADIMENT BUILDINC RIEC CIRDER CONSTRUCTION AND REPAIR Esference 1.

Appliemat's report on "Conestament Building Ring Cirder construction and Espair " (Docket No. 50-289), dated December 1, 1971.

2.

Addendum (not numbered) to the above report dated Janeary 21, 1972.

3.

Addendun #2 to the above report dated June 30, 1972.

4.

Addendum f 3 to the above report dated August 23, 1972.

3.

Addnad- #4 to the above report dated September 22, 1972.

Summary of the Costant of the Reperta The above cited reporta give a r,eeeral descriptian of concreta voids that resulted during esmetraction of the Containment Building Ring Cirder for limit No.1 ef the Three Mile Island Nueimar Station. They also present in detail the corrective aetisms which the applicant ine=ade to implement.

Summary of Ragulatory Evaluation We have reviewed and evaluated the subject report and the addenda to it I

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eited above. Our revier covered the information provided to date by the apptiemmt as the faltaring itames a.

antant and nature of structural defects b.

corrective actiamo proposed by the applicants this imeludes 1486 00'6' o ~ 4 I A h !al,

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< filling of concreta voids, the repairs of damaged reinfireing bars ad of prostressine. tendon trumpeta c.

reamits of stress analysis establishing the adequacy of the repaired ring girder to carry the desisa loads 4.

inspection preesdures during the lifetime of the facilfty.

Retulatory Position The applicant's eenelusien presented in tas cited docamments is that the repaired sing girder will be capable te withstand the design Isads which may be applied to the structure har its lifetime with safety factors of the same magnitada as is the originally designed ring girder. We eematur with this comelusies, with only the fallauring reservation:

Special attentien shes1A be given to quality assuranes and quality control at every step of the repair operations.

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04 TE. 6 Form AEC-314 t Rev. 9-531 AECW 0 240