ML19309G745

Final Deficiency Rept Re Unit 1 Containment Liner.Two Const Cranes Collided on 790406,damaging Liner.Reinforcing Bars Replaced & Vertical Angle & Circular Ring Stiffeners Repaired.Item Closed.Repair Documentation Encl

ML19309G745
Person / Time
Site:	Marble Hill
Issue date:	04/30/1980
From:	Shields S PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA
To:
References
NUDOCS 8005070488
Download: ML19309G745 (9)

Text

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3y iJ PUBLIC SERVICE  :

INDIANA i Electne System April 30, 1980 vcede Mr. James G. Keppler, Director Docket: STN 50-546 U. S. Nuclear Regulatory Co= mission STN 50-547 Region III Construction 7ermit Nos.: -

799 Roosevelt Road CPPR - 170 Glen Ell'/n, Illinois 60137 CPPR - 171 Mcrble Hill Nuclear Generating Station Units 1 and 2

Dear Mr. Keppler:

On April 9, 1979, Mr. F. R. Hodges of Public Service Company of Indiana, Inc. (PCI) notified your office of a potentially reportable incident involving the contain=ent liner on Unit 1. On May 9,1979, PSI transmitted to your office an interim report describing the progress on this incident to date and plans for its resolution. The following report resolves that item and constitutes a final report under the regulation.

On April 6, 1979, two construction cranes collided, with the counterweight of a tower crane striking the jib of a 4100 crane, which then fell and struck the containment liner. Damage to the linar and reinforcing occurred in two places. At elevation 525', one vertical angle stiffener and the circular C8 ring stiffener were da= aged. At approximate elevation 464', three #11 vertical and six #11 horizontal reinforcing bars were damaged. If this damage had remained uncorrected it could have adversely affected the safety of operatic.s of the plant.

Although, any breach of the leak tightness of the liner would have been detected in the Integrated Leak Rate Test, the liner anchorage system had been damaged and this damage may have manifested itself as a liner failure under accident conditions.

As a result of this incident the damaged reinforcing bars were replaced and the vertical angle stiffner and circular ring stiffener were repaired. Additionally, a dent in the post-tansioning shcathing was cut out and the sheathing rejoined with a standard coupler.

A " RABBIT" was subsequently pulled through the sheathing to insure g there vill be no problems pulling the tendon later. Documents 0 1000 East Main Street, Plainfield, Indiana 46168 317 . 839 .961

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'A PUSUC SERV'CE iMDIANA Letter: Mr. Jancs G. Ecppler April 30, 1980 describing inspection, repair and testing of the damage are attached.

Since this incident, the tower crane involved in the collision has been removed, climinating the possibility of this collision in the. future. If you have any question on this report, please fcci frac tc centact ee.

S4 :ccrely, l l.f W TDC/cg

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/ JU S. W. Shields cc: Director of Inspection and Enforcement U. S. Nucicar Regulatory Commission k'ashington, D. C. 20555 E. R. Schweibinz, P. E.

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July 5, 1979 Document Controller - Site Public Service Indiana Marble Hi!! 1:ticiant -

P. O. Do:< 19 0 Ger.cratiac S'a: ion Ncw 1.' aching LOn, IN 47162 Units I & il Specification Y-27 2 2 N-MH Job 0104 _

Attn: R. M. Brown i

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Dear Mr. Brown:

O Please be advised that the use of the Towcr Cranc was discontinued on July 3, 1979 and the crane is

• now being made ready for removal.

Very truly yours, O .

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im . V.- e Ilara.iton Project Manager Newberg-Marble Ilill * - .

WVil:md cc: PSI-L. A. Crews

-F. R. Hodges S&L-K. T. Kostal Gl31-P . W. Durocher

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'On April 6, 979, the Touer Crano in l' nit #1 Containnent swung into the jib of 4 4100 Crcne ucrhing on the ourcide of the Cent. sin . cat #1.

The jib fel , strihing liner stiffencrs, robar r.nd ccaffoldin ;. As a result of this incident, threc (3) 610 verticci bars and uix (6) #10 horirontal bars ucre replaced. Theco bars ucre placed c.nd cil secci plur.bcd prior to concrc:.c plccenent.

A post-tenciening cheathing uns alightly dented. The dent ucs cut out and the cheathing uas rejo.:ned by neanc of a ste.ndard coupler. A rni. bit _

vas subsequently used to check this shecthing prior to concrete pincer.ont.

1. E!!GI;EERI!;G DEPARTIE!;T -

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'R. A. ROYE,:

Constructica Engincer O nen .

cc: R. Woolley W. Muenstcrman S. Farlov .~

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!.'arble Mill Proc. No. V1 Rev. 1 ob Location .

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---ription of Areas Covered by This Ecport 15 Ring Vert, 16 Ring' Vert,.15 to 16 Girth Sean per page #5. or. sap- IF .

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P.O. Der 40 fic a Washir.::Sn. In::ier.3 47162 C12 25,3 33::1 May 7, 1979 Document Controller - Site i:

. Public Service Indiana P. O. Box 190 ,

New Washington, IN 47162 j f/crbic !!ill Nuclect .

Attn: R. M. Brown -

Generating Station t, Units I & !! '

Subject:

Crane Accidents Specification Y-2722 PSI Letter 4/25/79 N-MH Job 0104 -

O Gentle:aen:

These crane accidents are not to our liking and we do everything in our power to prevent any type accident, to say the least of crane accidents. N-:G has once  ;

again advised all shift operations as to where to dog j off the 4 600 where it cannot come into contact with a the Tower Crane, also we recu 2sted the crerators Q assure themselves that brake is 3ocked into position.

l At the present time we are anticipating the removal of the Tower Crane very soon (apprcximately 2-3 weeks) .

We feel this will totally eliminate any additional crane accidents.

O ve- tr,y;ours, -

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Examinations were performed and evaluated per the referenced precedure. l t.tT of welded rcpairs made during examination ha been comp:eted and found acceptabte (inctedes repair ca.ity)O No v.e ded Repai's *.*a:fe O f.tT of bfend ground arcas not weided has been cer-'p:eted and found acceptable.

B erid grinding perfor.: ed in accordance with GR Rev.

3 Defects or pctential defects not repaired daring examination are recorded above.

All othcr esamiced areas included in this repo-t were four n daacceptabfe. .

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