ML20040E524

Interim Deficiency Rept Re Omission of Protective Coating Behind Pad Attachment Inside Unit 1 Containment Dome Liner, Initially Reported 811228.Field Change Request Written to Allow Epoxy Surfacer to Be Used in Filling Weephole Gap

ML20040E524
Person / Time
Site:	Harris
Issue date:	01/26/1982
From:	Chiangi N CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, CQAD-82-142, NUDOCS 8202050033
Download: ML20040E524 (4)

Text

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Carolina Power & Light Company ., , C REG;pj -

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gg January 26, 1982 ,,

32 FEB I a g; 50 File: SH N-2/18 CQAD 82-142 Item 67 g ;,

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Mr. James P. O'Reilly D '

United States Nuclear Regulatory Coinnission @ NECEIVED i

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Marietta Street, Northwest -+

FED 4 1082 5 Atlanta, Georgia 30303 N$5}[($Q h x SHEARON HARRIS NUCLEAR POWER PLANT 4/ /?

DOCKET NO. 50-400 OMISSION OF PROTECTIVE COATING BEHIND PAD ATTACHMENT T I \

INSIDE THE UNIT 1 CONTAINMENT DOME LIhER

Dear Mr. O'Reilly:

h Attached is an interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) on January 21, 1982. CP&L is pursuing-this matter and it is currently projected that corrective action and submission of the final report will be accomplished by April 1,1983.

Thank you for your consideration in this matter.

Yours very truly, DR/mt Attachment Q f),/

cc : Mr. G. Maxwell W/A .

Mr. V. Stello (2) W/A N. J.fqhiaggi . ,g - Manager Engineeri'ngd Construction Quality Assurance / Quality Control

'OFFISIAL COPY 411 Fayetteville Street e P. O. Box 1551

• Raleigh, N. C 27602 8202050033 820126 PDR ADOCK 05000400

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. 'a Carolina Power & Light Company Shearon Harris Nuclear Power Plant Unit No. 1 Interim Report January 26, 1982 i

Reportable Under 10CFR50.55(e) 1

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SUBJECT:

Shearon Harris Nuclear Power Plant / Unit No. l' 10CFR50.55(e), reportable deficiency.

Omission of protective coating behind pad attachment inside the Unit 1 containment dome' liner.

ITEM: The pad attachments inside the containment dome liner I were welded, leaving one inch (1") weephole at the low part of the pad.

SUPPLIED BY: Not a supplier - related deficiency. The pad attachments were welded in the field.

NATURE OF DEFICIENCY: As a result of the curvature of the dome, a small space exists between the pads and the dome. These small spaces / areas of the containment liner plate under the pads (plates) are uncoated and are exposed to containment atmosphere via the weephole and present potential corrosion sites which may result in a reduction in liner plate thickness below the design allowable thickness. -The erection sequence and design configuration prohibit. complete coating under these pads.

DATE PROBLEM WAS CONFIRMED TO EXIST: December 28, 1981 DATE PROBLEM REPORTED: On~ December 28, 1981, Mr. N. J.-Chiangi notified the NRC (Mr. C. Julian) of an item considered potentially reportable per the provision of 10CFR50.55(e). On January 21, 1982, Mr. L. E. Jones notified the NRC, Region II (Mr. C. W. Burger) that this item was reportable per the provisions of 10CFR50.55(e).

SCOPE OF PROBLEM: This problem is limited to the Unit I containment dome liner. To date approximately 200 to 250 of the pad attachments have been installed.

SAFETY IMPLICATION: The liner plate in the containment building furnishes no structural value for the building, but rather serves as an impervious barrier for containing any possible type of radioactive contamination / release that may exist inside the building. For this reason, the liner plate has to be protected against corrosion. Considering the worst possible environment that could exist in the containment.for an extended period (design life), the possibility existed that the Page 1 of 2

.s liner plate, without the protective coating, could f l

have had a corrosion rate which would cause its wall thickness to fall below the minimum allowable. ,

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REASON DEFICIENCY IS REPORTABLE: Reportable since the condition could possibly have resulted in the violation of containment liner plate  ;

minimum wall thickness required for a design basis I accident.

CORRECTIVE ACTION: A field change request was written to allow Keeler &

Long 6548-S epoxy surfacer to be used in filling the 1' weephole gap. This was approved, but to date the work has not been done. This work will be accomplished when access is available to the dome for other required work.

FINAL REPORT: A final report will be issued once the corrective action described above has been completed. It is anticipated that the corrective action completion date will be April 1, 1983.

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