ML20002D028
| ML20002D028 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/07/1981 |
| 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-81-23, NUDOCS 8101190147 | |
| Download: ML20002D028 (2) | |
Text
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,j MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi EdhMhMannE P. O. B O X 16 4 0. J A C K S O N, MI S SIS SI P PI 3 9 2 0 5 T'$ErYN"c*if January 7, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Comission Region II 101 Marietta Street, N.W.
Suite 3100 Atlanta, Georgia 30303 Attention:
Mr. J. P. O'Reilly, Director
Dear'Mr. O'Reilly:
t,
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/53, 011 Level Indicator Lines Outside Missile Barriers, Final Report AECM-81/23
References:
- 1) AECM-80/234, 9/29/80
- 2) AECM-80/294, 11/25/80 On August 28, 1980, Mississippi Prwer & Light Company notified Mr. M. Hunt of your office of a Potentially Reportable Deficiency (PRD) concerning the location of oil indicator lines for fan gear boxes outside the tornado missile barriers of the standby cooling towers.
l We reported in Reference 1 that this item is reportable under 10CFR50.55(e). Our final report for resolution of this deficiency is attached. This condition is not reportable under 10CFR21, since the cooling towers have not yet been offered to MP&L for acceptance.
Yours truly, J. P. McGaughy, Jr.
O4 EWC:mt 4
Attachment cc:
Mr. N. L. Stampley Mr. Victor Stello, Directer Mr. G. B. Taylor Mr. R. B. McGehee Div. of Insp. & Enforcement South Miss. Electric Mr. T. B. Conner U.S. Nuclear Reg. Com.
Power Association Washington, D.C.
20555 P. O. Box 1589 Hattiesburg, MS 39401 8101190\\Q}
Member Middle South Utilities System
=
e Attach =ent to AECM-81/23 Page 1 of 1 FINAL REPORT FOR PRD-80/53 I.
Description of Deficiencv Oil indicator piping for the two standby service water (SSW) system cooling towers for Units 1 and 2 are located outside the missile barriers. This condition exists on all eight cooling tower fan gear boxes. The oil indicator piping protrudes approximately two feet past the cooling water missile barrier.
II.
Analvsis of Safety Implications The piping is susceptible to missile damage which could cause the oil pipe to break.
If the oil pipe were to break, a loss of lubricating oil frem the fan gear box could cause the gears to seize, disabling the fan. With the loss of the fans, a loss of cooling to the water in the SSW basins would occur. This loss of cooling would prevent the SSW System from performing its function of cooling safety related equip =ent.
The condition, if it had remained uncorrected, could have adversely affected the safety of the plant, and is therefore reportable under 10CFR50.55(e)(1)(ii). Since the cooling tower had not been offered to MP&L for acceptance, 10CFR21 is not applicable.
III. Corrective Actions Taken Corrective action to provide missile shielding of the cited exposed oil lines has been coordinated by our Architect / Engineer with the contractor, Ceramic Cooling Tower Co=pany. Specific installation details to relocate the cited exposed oil line to the existing Fan Motor Roem on the Fan Deck, which is already designed for missile protection, has been provided. Pipe re-routing is in progress, and the piping isometrics were issued in December,1980. Corrective action is scheduled for completion by April 21, 1981.
Recurrence of the cited condition at Grand Gulf Unit 2 is pre-cluded by virtue of the fact that missile shielding protection is being provided for both units.
The Constructor's Management Corrective Action Report, MCAR #100, will track corrective actions to completion, and is available at the GGNS jobsite.
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