ML20197G228

Forwards SER Re Resolution of Magnetic Particle Linear Indications on Containment Weld Pads.Repair of Peripheral Fillet Welds & Allowing Cracks in Remaining Redundant Slot Fillet Welds Acceptable

ML20197G228
Person / Time
Site:	Columbia
Issue date:	01/23/1984
From:	Johnston W Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
ML20197G231	List: ML20197G228 ML20198E931
References
CON-WNP-0727, CON-WNP-727 NUDOCS 8402010014
Download: ML20197G228 (2)

Text

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. 3AN 2 31984 1

Docket No: 50-397 MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing Division of Licensing

, FROM: William V. JoNston, Assistant Director

! Materials, Chemical & Environmental Technology Division of Engineering

SUBJECT:

SAFETY EVALUATION REPORT OF THE APPLICANT'S RESOLUTION OF MAGNETIC PARTICLE LINEAR INDICATIONS ON CONTAINMENT WELD PADS Plant Name: Washington Public Power Supply System, WNP-2 Supplier: General Electric / Brown & Root Docket No: 50-397 Reviewer: D. E. Smith Responsible Branch and Project Manager: LB #2, R. Auluck Review Status: Complete The Materials Application Section, Material Engineering Branch (MTEB),

4 Division of Engineering, has completed its review of applicant's repairs and other decisions concerning magnetic particle linear indications on 4

welds attaching containment weld pads to the containment shell. Region V requested our assistance and Task Interface Agreement No. 83-99 of November 4, 1983 was assigned for this effort. The MTEB coordinated its review with the Structural & Geotechnical Engineering Branch (SGEB). The SGEB structural reviewer has also reviewed the structural aspects of this issue and concurs with MTEB's conclusion.

During the WNP-2 Qualification Verification Program, inspection of attachment welds to the shell found sorne magnetic particle indications. The applicant allowed some of the magnetic particle indications, which are believed to j be underbead cracking, to remain as is, i.e., without weld repair. The 1

applicant contracted with Aptech Engineering Services, Inc. to summarize

! and assess the magnetic particle indications, their repair; and where weld repair was not performed, evaluate the structural performance with the flaws present. Aptech's report, AES 8309413Q, " Assessment of Pad-to-Shell Fillet Weld Indications at Washington Public Power Nuclear Station Unit 2" was provided to MTEB for evaluation. The report covered fracture mechanics evaluations of the underbead cracks which were allowed to remain.

Sizing of the flaws was bounded by the largest flaws found in the applicant's reinspection.under ~

their Quality Verification Program.

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ADOCK 05000397

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Contact:

D. E. Smith X-24553 i

L UAN 2 31984 t

Thomas M. Novak '

We agree with the conclusions of the report that repair of the peripherai l fillet welds and allowing the cracks in the remaining redundant slot fillet ~

welds and other attachment welds to the containment shell to remain as is  ;

(without weld repair) are acceptable.

Our Safety Evaluation Report is attached.

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William V. Johnston, Assistant Director Materials, Chemical & Environmental '

Technology Division of Engineering I

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Attachment:

As stated f

cc: R. Vollmer  !

D. Eisenhut  ;

t A. Schwencer *

! E. Sullivan *

! 5. Pawlicki J. P. Knight  :

G. Lear R. Auluck  !

B. D. Liaw t l W. Hazelton R. Klecker <

C. Y. Cheng D. Smith i MTEB Reading Files

MTE8 WNP 2 Files i  !

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DE:MTEB - ' DEif4TEB DId B. D.,f B, DE:SGEB DE:AD:CSE i

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WE Haze,1 ton -Liaw G. Lear J. P. Knight 1

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DE: AD:MCET '

W. V. Johnston '

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