ML20002E152

Interim Deficiency Rept 2 Re Standby Svc Water Basin Fans, Initially Reported 800826.Fan Pillow Block Bearings Failed After 300-h of Operation.Constructor & Supplier Conducting Evaluations.Final Rept Will Be Filed by 810422

ML20002E152
Person / Time
Site:	Grand Gulf
Issue date:	01/06/1981
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-81-22, NUDOCS 8101260519
Download: ML20002E152 (2)

Text

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' ' 8.5 :l O P ** (J MISSISSIPPI POWEC&. LIGHT COMPANY Helping Build Mississippi l

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l P. O . B O X 16 4 0, J A .!

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l 50 D[ HEM January 6, 1981 l 80- 052 - 03b " l l

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission 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. 50-416/417 File 0260/15525/15526 PRD-80/52, Standby Service Water Basin Fans, Status Report No. 2 AECM-81/22 l On August 26, 1980, Mississippi Power & Light Company notified

( Mr. M. Hunt of your office of a Potentially Reportable Deficiency I (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site.

This deficiency concerned the failure of pillow block bearings in the Standby Service Water Basin Fans.

l We are continuing our investigation of this item for reporta-bility under 10CFR50.55(e) and 10CFR21. Our status report on this deficiency is attached.

" We expect to complete our evaluation and report to you on this matter by April 22, 1981.

Yours truly, s

~

y J. P. McGaughy, Jr. /f EWC:mt Attachment cc: Mr. N. L. Stampley Mr. Victor Stello, Director Mr. G. B. Taylor Mr. R. B. McGehee Division of Insp. & Enforcement South Miss. Electric Mr. T. B. Conner U. S. Nuclear Regulatory Comm. Power Association Washington, D.C. 20555 P. O. Box 1589 Hattiesburg, MS 39401 83012005/9' Member Middle South Utilities System OFFICIAL cony

)

1. Attschment to AECM-81/22 Paga 1 of 1 STATUS' REPORT #2 FOR PRD-80/52 I. Description of Deficiency Pillow block bearings on three of the eight Standby Service Water Cooling Tower Fans (Q1PA1C002A-A, B-A, and C-B) for GGNS Units 1 and 2 supplied by Ceramic Cooling Tower of Fort Worth, Texas, failed completely after 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> of operation. This condition did not meet the Bochtel Design Specification 9645-M-015.1, which specified a minimum life expectancy of 100,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> for radial and axial shaft load, roller bearings.  !

II. Approach to Resolution of the Deficiency The following actions have been planned to resolve this deficiency:

a. Determine the cause of the bearing failures;

b. Evaluate the deficiency to determine its affect on safe oper-ations of the GGNS. This evaluation will assume that the deficiency remains uncorrected throughout the expected life-time of the plant;

c. Determine if similar deficiencies exist, or could exist, and take appropriate actions to correct them; and

d. Perform corrective actions to include actions to preclude recurrence. _

t The above actions are being tracked under Bechtel Quality Action Request, QAR F-218, which is available for inspection at the GGNS job site.

III. Status of the Proposed Resolution The constructor and supplier are conducting evaluations to deter-mine the cause of the failure. The supplier has recommended re-placement of the damaged bearings with bearings having a different model number. Unit 1 bearings are scheduled to be replaced in January, 1981, with Unit 2 bearings to be replaced later. Ceramic Cooling Tower has also recommended replacement of the drive shafts on the three affected fans with the drive shafts from the Unit 2 fans and that the Unit 1 drive shafts be returned to them for ev&luation.

IV. Reasons for Final Report Delay The investigation to determine reportability has not been completed.

V. Projected Completion ~Date I A final report will be available April 22, 1981.

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