ML20062N276

Interim Deficiency Rept Re Threaded Studs W/Insufficient Thread Engagement Into Embedded Strip Plates,Initially Reported on 811013.All Plates in Question Threaded Completely Through Plates.Final Rept Expected in May 1982

ML20062N276
Person / Time
Site:	Harris
Issue date:	12/10/1981
From:	Chiangi N CAROLINA POWER & LIGHT CO.
To:	James O'Reilly, Preilly J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112180479
Download: ML20062N276 (5)

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December 10, 1981 0 li A. . .

~: J0 File: SH N-2/18 Irem 63 Mr. James P. O'Reilly United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest Atlanta, Georgia 30303 SHEARON HARRIS NUCLEAR POWER PLAIR DOCKET NOS. 50-40'J, 50-401, 50-402, 50-403 THREADED STUDS WITH INSUFFICIEIR THREA_D ENGAGRiENT INTO EMBEDDED STRIP PLATES

Dear Mr. O'Reilly:

Attached is an inte-im report on the subject item which was deemed as reportable on November 10, 1981. CP&L is pursuing this matter, and it is currently projected that the final report will be submitted during May, 1982.

Thank you for your consideration in this matter.

RDB/ecc Yours very truly, Attachment cc: Mr. G. Maxwell W/A Q. . '_,_.

Mr. V. Stello (2) W/A N. o . ngi - Manager Engineering & Construction Quality Assurance / Quality Control J

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8112180479 811210 PDR ADOCK 05000400 . . .

S PDR ,J.FFICI AL COFiT _-

411 Fayettevme Street

• P. O. Box 1551

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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNITS NO. 1 AND 2 INTERIM REPORT December 9, 1981 Reportable Under 10CFR50.55(e) 3 - ..- . _ . - -r. - - - - - -yw ,- -

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_ 1 15UBJECT: Shearon Harris Nuclear Power Plant / Units No.1 and 2 10CFR50.55(e), reportable deficiency. Thread engagement of threaded studs into embedded strip plates.

ITEM: Improperly installed threaded studs on embedded strip plates. These tapped strip plates and threaded studs have been used in many cases in lieu of strip plates with welded-on Nelson headed studs.

SUPPLIED BY: Not a supplier-related deficiency. The studs and strip plates were assembled in the field.

NATURE OF DEFICIENCY: The deficiency involves Seismic Category I embedded strip plates with screwed-in studs that have insufficient thread engagement. These screwed-in studs are used in lieu of welded-on Nelson headed

. studs. The deficient plates / studs were found after concrete placements and acceptance of the placements.

DATE PROBLEM WAS CONFIRMED TO EXIST: October 13, 1981 DATE PROBLEM ,

REPORTED: October 13, 1981, Mr. N. J. .Chiangi notified the NRC, Region II (Mr. R. Butcher), that the item was potentially reportable. November 10, ' 1981, Mr. N. J.

Chiangi notified the NRC, Region II (Mr. R. Butcher),

that this item was reportable per the provision of 10CFR50.55(e).

SCOPE OF PROBLEM: Approximately 1300 of the strip plates to be used with screwed-in studs have been ordered. To date, approximately forty-five percent (45%) of the inspection has been completed in the containment, fuel handling, reactor auxiliary, reactor auxiliary-common, diesel generator, diesel fuel oil storage tank, and tank 1 and 2 buildings. The intake and screening j structures have been completely checked. A large i number of plates that have threaded studs with 4

improper thread engagement have been found. Also,.

hangers have been found welded to plates that have threaded studs with improper thread engagement. The

! investigation has been hampered by the advanced stages

! of construction in many areas (pipe hangers, pipes, i cable tray hangers, cable trays, conduits, lights and

H7AC ducts) and shoring in place.

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F SAFETY IMPLICATION: Pipe, cable tray, and HVAC hangers as well as oth'er i miscellaneous items attach to these plates. Plates with studs not having _ proper thread engagement will possibly be overstressed in normal operation or during a seismic event. Sufficient investigation has not been conducted to actually evaluate the loading on the identified plates.

REASON DEFICIENCY '

IS REPORTABLE: Reportable due to the magnitude of the problem plus the extensive evaluation and/or rework required.

CORRECTIVE ACTION A deviation notice against site work procedures has been issued requiring notification of site engineering personnel prior to attaching any item to an embedded plate with screwed-in studs. All the plates in question are threaded completely through the plates and, therefore, are readily identifiable. This action

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will prevent a plate from being overloaded during the construction peried. As noted in the " Scope of Problem," the investigation is approximately 45%

complete. None of the cases identified have been submitted to the Engineer for resolution. Attachment 1 is a tentatire schedule for completing identification and resolution of identified problems by building or structure.

FINAL REPORT: A final report will be issued once the corrective.

action described above has been completed. It is currently projected that the submittal date will be in May, 1982.

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ATTACHMENT 1 INTERIM REPORT REPORTABLE ITEM 63 Building or Structure Identify All Problems Resolve Problems Reactor Auxiliary I 12/18/81 3/26/82 Reactor Auxiliary II 1/15/82 2/19/82 Reactor Auxiliary - Co= mon 1/8/82 4/9/82 Fuel Handling 1/29/82 4/23/82

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Containment 1/8/82 3/19/82 Intake 12/4/81 2/5/82 Screening 12/4/81 2/5/82 Tank I 2/5/82 4/2/82 Tank II 2/5/82 2/26/82 Diesel Generator 12/4/81 2/12/82 Diesel Fuel Oil Storage 12/4/81 12/2/82 e