ML20091M297

Interim Part 21 & Deficiency Rept 2 Re Internal Coating of MSRV & MSIV Accumulators.Caused by Improper Surface Preparation & Application of Coating.Tanks Will Be Replaced W/Stainless Steel Tanks

ML20091M297
Person / Time
Site:	Grand Gulf
Issue date:	05/31/1984
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-84-293-000 2, AECM-84-2-0008, AECM-84-2-8, PT21-84-293, PT21-84-293-000, NUDOCS 8406110221
Download: ML20091M297 (4)

Text

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8 MISSISSIPPI POWER & LIGHT COMPANY Helping Build A1ississippi P. O. BOX 1 40, J ACKSON, MISSISSIPPI 39205 Q j@

JAMES P. McGAUGHY. JR May 31, 1984 WICE PRE SiOENT U. S. Nuclear Regulatory Connnission Region II 101 Marietta Street, N.W.

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

SUBJECT:

Grand Gulf Nu: lear Station Unit 2 License No. NPJ-13 Docket Nos. 50-417 File 0260/15525/15526/16694.4 PRD-83/16, Interim Report #2 Unit 2, MSRV, MSIV Acc umulator s AECM-84/2-0008 Re ference: 1) AECM-83/0759, 11,'18/83 On November 15, 1983, Mississippi Power & Light Company notified Ms. L.

Watson, of your of fice, of a Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS). The deficiency concerns failure of the internal coating of the MSRV and MSIV accumulators. This deficiency has been determined to be reportable under the guidelines of 10CFR21 for Unit 1. Our Final Unit 1 Report was submitted in Reference 1.

Our investigation into the reportability of this condition for Unit 2 has been completed and it has been determined that it is reportable under the provisions of 10CFR50.55(e) . Telephone notification was made to Mr. Ed Ford, of your office, on Apirl 11, 1984. Mr. Ford agreed that the written report could be submitted on today's date.

Attached is our Interim Report #2 for Unit 2. We expect to submit a Final Report prior to Unit 2 Fuel load.

Yours truly 8406110221 840531 PDR ADOCK 05000417 '

S PDR

[pr J. P. McGaughy, Jr.

KDS:dr ATTACHMENT " ~~

OFFICIAL CDP cc: See page 2 Member Middle South Utilities System I g

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- Mr ; J . P. O' Re il ly AECM-84/2-0008 NRC Page 2 cct Mr. J. B. Richard Mr. R.' B. McGehee Mr. Nicholas S. Reynolds, Esq.

i Bishop, Liberman, Cook, Purcell & Reynolds

' 1200 Seventeenth Street, N.W.

Suite 700 Washington, D. C. 20036 Mr. Richard C. DeYoung, Director Of fice of Inspection & Enforcement U. S. Nuclear Regulatory Comunission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 1.

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.. Attcchesnt to AECM-84/2-0008 PKgs 1 of 2 INTERIM REPORT G2 FOR UNIT 2, PRD-83/16 I. Description of the Deficiency b

The deficiency concerns the failure of the internal coating applied to the MSIV and MSRV valve accumulators. The coating application on the accumulators was not adequate.

, The results of " air. blows" conducted as a result of an earlier defic-iency Jf _the instrument air system prompted an internal inspection of the coated carbon steel accumulators and ADS receivers. This inspec-tion revealed failures in the internal coating of the accumulators.

However, the internal coating on the four (4) ADS receivers was satisfactory. The failure of the coating was exhibited by blistering, 4 peeling, and uncoated areas which resulted in rust formation inside the 1 vessels. It has been determined that the cause of failure was due to improper surface preparation and/or application of the coating.

The deficiency affects the Instrument Air System and the Main Steam System. It is not reportable under 10CFR21 for Unit 2 since the i systems / components have not been turned over to MP&L.

The existence of uncoated carbon steel vessels could result in corrosion products being introduced-into the air supply to the MSRV's

and MSIV's, which could impair the performance of these valves from changing position, when required, during a steam line break. This would prevent closure of the valves which could lead to exceeding the limits of 10CFR100. -  ;

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Therefore, had' the cited condition remained uncorrected, the deficiency l could have' affected adversely the safety of operations of the power  ;

plant at any time throughout the expected lifetime of the plant.

i This deficiency is not applicable to the NSSS Vendor.

II. Approach to Resolution of the- Problem It has been determined that the cause of the failure was due to 4

improper surf ace preparation of the tank internal surface and/or i improper application of the coating. The deficiency applies to 36 accumulator tanks for Unit 2.

! Proposed changes' will be to replace 'all of the existing coated tanks with new stainless steel tanks. for corrosion prevention.

Since this proposed change corrects the deficiency. for all subject -

Jtanks,Jthe problem will not occur on additional. tanks at a later date.

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i Attcchment to AECM-84/2-0008 Page 2 of 2 III. Status of Proposed Resolution l

The safety implications, cause, and extent of the deficiency have all been determined. Corrective actions and actions to prevent recurrence have been proposed but have not been finalized and completed at this time. All corrective actions will be complete prior to Unit 2 fuel load.

IV. Reason Why Final Report is Delayed The final report is delayed pending finalization of the proposed design changes to be implemented for Unit 2.

V. Date when Final Report will be Submitted A final report will. be submitted prior to Unit 2 fuel load.

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