ML19343B926

Interim Part 21 Rept Re Transamerica Delaval Turbocharger Thrust Bearings Lubrication,Initially Reported on 810102. Licensee Will Evaluate Manufacturer Proposed Mod.Final Rept Projected for 810602

ML19343B926
Person / Time
Site:	Grand Gulf
Issue date:	01/29/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-81-355-000 10CFR-50.55E, AECM-81-50, PT21-81-355, PT21-81-355-000, NUDOCS 8102180261
Download: ML19343B926 (4)

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PRELIMINARY EVALUATION OF THE' ATTACHED REPORT It01 CATES LEAD RESPbN FO' LOWJP AS SF0hN BELOW:

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Afississippi P. O. B O X 1640 J AC K SO N. MIS SIS SIPPI 3 9 205 JAMES P. McGAUGHY, JR.

,ssisu.a vice ms. con January 29, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Cor=11ssion Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention:

Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-4 M 7 File 0260/15525/15526 PRD-81/01, Status Repun, Trans-america DeLaval Turbocharfer Lubrication AECM-81/50 i

On January 2,1981, Mississippi Power & Light Ccepany notified Mr. P. K. VanDoorn, of your office, of a Potentially Reportable De-ficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construc-tion site. The deficiency concerns n:brication of the thrust bear-ings on Turbochargers ca.tufactured by the Elliott Company for De-Laval DSRV engines.

Transamerica Delaval notified the NRC of a 10CFR Part 21 condition concerning the above on December 16, 1980.

Transamerica DeLaval has designed a system modification cor-recting the above problem.

However, ve will require more time to review the adequacy of their modification and formulate proper corrective actions, as well as determine reportability under 10CFR 50.55(e) and 10CFR21. We expect to forward to you our final report on this matter by Ene 2, 1981. Our status report is attached.

Yours truly, M

p J. P. McGaughy, Jr.

CWH:mt Attachment cc:

See page 2 Member Middle Sou:h Utilities System

o-4 MIDOIOOIPPI POWER O LIGHT COMPANY 1

Mr. J. P. O'Reilly AECM-81/50 NRC Page 2 4

cc:

Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director (-Inid 20?Y FOR Div. of Inspection & Enforcement U. '. Nuclear Regulatory Comission Washington, D.C.

20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 4

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Attcchment to AECM-81/50 Pcg2 1 of 1 -

STATUS REPORT FOR PRD-81/01 I.

Descriptien of Deficiency Transamerica DeLaval notified the NRC on December 16, 1980, of a 10CFR Part 21 condition, which identified a potential problem with lubricacion of the thrust bearings of the turbochargers which could result in engine non-availability.

The engines identified with GGNS are SN70433/36 DSRV.

These turbochargers are manufactured by Elliott Company of Jeannette, PA.

They are installed on the engines by Transamer-ica DeLaval and lubricated in acccrdance with Elliott Company's recommendations.

The potential defect exists in the lubricating oil system that supplies oil to the turbocharger bearings. The design of this system permits lubricating oil to flow to the bearings only when the engine is running and prevents oil flow to the bear-ings when the engine is in the standby code. The oil seal of the turbocharger is a labyrinth type seal and is only effective when the turbocharger is running. Because of the possibility of seal leakage when the turbocharger is at rest (engine Standby mode) the turbocharger L. O. system is bypassed at this time.

Engine availability could be affected if the defect noted by DeLaval is not corrected. If the engines are not available, i

then the standby generators would not be able to supply power in the event of the loss of offsite pcwer. As such, the ability to safely shut down the plant and maintain it in a safe, shut-down condition would be impaired following a loss of offsite power.

II.

Proposed Resolution FT&L has implemented the following program through the Architect /

Engineer / Constructor:

1.

Evaluate Transamerica DeLaval's proposed modification for application at GGNS.

2.

Investigate corrective actions required in light of (1.)

above to correct the deficiency and to preclude recurrence.

3.

Investigate further the possible impacts on safety and de-termine reportability under 10CFR50.55(e) and 10CFR21.

III. Status of Proposed Resolution / Reason for Delay in Final Report Initial investigations are still under way by Architect / Engineer.

IV.

Projected Final Report Submittal Date We project submission of our Final Report by June 2,1981.