ML20078H060

Supplemental Interim Deficiency Rept PRD-81/29,Rept 2 Re Temp Flex Penetration Bellows Assemblies Exhibiting Cracked & Broken Welds Between Shroud Support Spokes & Bellows End Sleeves.Initially Reported on 810529.Final Rept by 840815

ML20078H060
Person / Time
Site:	Grand Gulf
Issue date:	10/07/1983
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-83-2-0006, AECM-83-2-6, NUDOCS 8310140007
Download: ML20078H060 (4)

Text

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E MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B OX 164 0, J AC K S O N, MIS SISSlP PI 3 92 0 5 83 0CTil P I: dt .

JAMES P. McGAUGHY. JR.

WCE PRESiOENT U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 2 Docket No. 50-417 License No. NPF-13 File 0260/15525/15526 PRD-81/29, Supplemental Interim Report #2, Temp Flex Penetration Bellows Assemblies AECM-83/2-0006

Reference:

(1) AECM-81/385, 10/6/81 (2) AECM-83/2-0003, 3/31/83 On May 29, 1981, Mississippi Power & Light Company notified Mr. V.

Brownlee, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction sice. The deficiency concerns incorrectly welded spokes on the bellows end sleeves of penetration assemblies manufactured by the Temp Flex Company of Compton, California.

This deficiency was determined to be not reportable and was closed out for Unit 1 and Unit 2 in Inspection Report 50-416/81-50 and 50-417/81-22. However,

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on March 1,1983, MP&L informed Mr. 2. Butcher, of your office, that the PRD was being re-opened for Unit 2 to assure that the deficiency is adequately addressed .

Based on the results of our investigation MP&L has determined that this deficiency is reportable under the provisions of 10CFR50.55(e) for Unit 2.

Details are provided in the attached Interim Report. MP&L expects to submit a Final Report by August 15, 1984.

Yours trul 0310140007 831007 -

PDR ADOCK 05000417

%r J. P. McGaughy, r. ,

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Attachment to AECM-83/2-0006 Page 1 of 2 SUPPLEMENTAL INTERIM REPORT #2 TO PRD-81/29 I... Description of the Laficiency Penetration bellows assemblies manufactured by Temp Fles have exhibited

. cracked and broken welds at the junction between the shroud support spokes and the bellows end sleeves. Contrary to Temp Fles design drawing requirements, fillet welds were used instead of full penetration welds.

This deficiency affects the. Nuclear Boiler System (B21), Residual Heat Removal System (E12), Reactor Core Isolation Cooling System (E51),

Reactor Water Cleanup System (G33) and the Fuel Pool Cooling and Cleanup System (G41). The five bellows assemblies contained in the Standby 1 - Liquid Control System (C41) do not have spokes; therefore System C41 is not affected as was reported in letter reference 2.

This deficiency is applicable to Unit 2 only, and does not apply to the NSSS supplier.

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Temp Flex calculations state that a 1/8" fillet weld, in lieu of a full

j. penetration weld, is required to support the shroud during a design seismic event. Inspection results of the "as welded" condition indicate r

that certain spokes have undersized welds, i.e., less than 1/8". Failure of the welds to support the shroud could cause a ptsscture in the bellows i convolution and breach the drywell pressure boundary, i

l Had the cited condition remained uncorrected, .the Geficiency could have l affected adversely' the safety of operations of the power plant at any time throughout -the expected life time of the plant. Therefore, this deficiency is reportable under the provisions of 10CFR50.55(e).

II. Approach to Resolution of the Problem The cause and extent of the deficiency are still under investigation.

! Corrective and remedial actions will be addressed upon completion of the l inve stigation.

Our Constructor has determined that the deficiency could apply to nineteen (19) of the twenty-four (24) bellows assemblies supplied under l

Bechtel Specification M-318.0. (Five (5) bellows assemblies in System l 'C41 - Standby Liquid Control System do not have spokes.)

I Our Constructor has completed the inspection of fif teen (15) bellows

! assemblies and all of the nonconformances noted have been identified, dispositioned, repair welded as necessary, and accepted on Nonconformance

i. Report (NCR) 6535.

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l Attachment to AECM-83/2-0006 Page 2 of 2 l The inspection of the four (4) remaining bellows assemblies cannot be

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initiated until the installation is completed. The installation is not scheduled until some time in 1984. NCR 6535 will document and track all nonconforming conditions that are found from a complete inspection of these remaining bellows assemblies. Upon completion of the inspections, the NCR will be dispositioned and processed in accordance with applicable procedures.

III. Status of Proposed Resolution The cause, extent and corrective actions are scheduled to be resolved by July 1,1984, based on the results obtained .from the investigation described above. j IV. Reason Why a Final Report Will Be Delayed j f

Due to the limited scope of construction at this time, the investigative actions identified above are scheduled to be completed by July 1, 1984.

V. Date When a Final Report Will Be Submitted MP&L expects to submit a Final Report, concerning this matter, by August 15, 1984. <

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