ML20002E152
| 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
.
' ' 8.5 :l O P ** (J MISSISSIPPI POWEC&. LIGHT COMPANY Helping Build Mississippi
\\
l P. O. B O X 16 4 0, J A C f:!ji.O N, M I S S I S S I P P I 3 9 2 0 5 si:'
- l 50 t
D[ HEM January 6, 1981 l
80- 052 - 03b "
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
Dear Mr. O'Reilly:
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' OFFICIAL cony Member Middle South Utilities System
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.
The above actions are being tracked under Bechtel Quality Action t
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.
j
..