ML19338E077

Final Deficiency Rept Re Incorrect Translation of Weld Requirements from Design Drawings to Field Sketches. Erroneous Welding Direction Corrected.Future Field Sketches Will Include Instruction to Refer to Design Drawing

ML19338E077
Person / Time
Site:	Grand Gulf
Issue date:	09/16/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:
References
10CFR-050.55E, 10CFR-50.55E, AECM-80-223, NUDOCS 8009240480
Download: ML19338E077 (2)

Text

-

a o

)) MISSISSIPPI POWER & LIGHT COMPANY

" ~"

Heloing Build Mississippo P. O. S O X 16 4 0. J A C K S O N. MIS SISSIPPI 3 S205 mes a uccaccm. .a. September 16, 1980 454 STamf v'C3 pefliO(NT Office of Inspection & Enforcecent U. S. Nuclear Ragulatory Cem=1ssion Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

Dear Mr. O'Reilly:

SLGJECT: Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/34, Final Report, Infor=atica Incorrectly Transferred From Design Drawing to Field Sketch AECM-80/223

Reference:

AECf-80/164, 7/23/80 On June 26, 1980, Mississippi Power & Light notified Mr. M.

Hunt of your office of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns the incorrect translation of weld requirements from design drawings to field sketches.

We have since determined that this deficiency is reportable under 10CFR50.55(e). Our final report on this =atter is attached.

Yours truly.

Of p r J. P. McGaughy, Jr.

Assistant Vice President, Nuclear Production EH:st Attachment ec: Mr. 5. L. Sta:pley Mr. Victor Stello, Directo Mr. R. 3. McGehee Division of Inspection & Enforcecent Mr. T. 3. Conner U. S. Nuclear Regulatorf Cc==ission Washington, D.C. 20535 30/ y 5

8009240k Memeer Mideia South utiiities System

'4 FINAL REPORT FOR PRD-80/34 I. Description of Deficienev Four containment penetration welds were =ade centrary to design

, drawing instruction. Field welds for penetrations 71 (two welds),

70, and 45 (Drawing 9645-C-1004) were welded as fillet welds!

as called for on the field sketches, rather than as full pene-tration welds and partial penetration plus fillet welds, as '

called for on the design drawing.

The systems affected are:

ResiJn1 Heat Removal System (Q1E12)

Low Pressure Core Spray System (Q1E21)

Reactor Core Isolation Coolant System (Q1E51)

Instru=ent Air System (Q1 PSI)

II. Safety Implications All four deficient welds are located en GGNS Unit I Containment penetrations. Subsequently GGNS Unic II is unaffected by this deficiency.

The constructor has determined that the welds used for penetra-tions 46, 70, and 71 were inadequate and could have caused a loss of containment integrity if they had remained uncorrected.

III. Corrective Actions Contain=ent penetration drawings, field sketches, and design drawings have been reviewed by our constructor and it has been determined that the condition is limited to the four contain=ent penetration welds described above for Unit I.

The field sketches containing the erroneous welding direction have been corrected by removing all welding direction and adding the instruction to see the Design Drawing (9645-C-1004) for welding direction.

To prevent recurrence, the field sketches which are generated from Civil Drawings will not include welding direction on the sketch but will include the instruction to see the Civil Drawing for welding direction. All Unit I contain=ent penetration field l sketches have been revised to ecmply with this method. When Unit II field sketches are generated, they will also ec= ply with l this method. '

This condition is being tracked by Bechtel MCA7 GGNS-88, 1

. -