ML20009F563
| ML20009F563 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 05/12/1981 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21- 10CFR-050.55E, 10CFR-50.55E, AECM-81-168, NUDOCS 8107310306 | |
| Download: ML20009F563 (3) | |
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MISSISSIPP1: POWER & LIGHT COMPANY Helping Build Mississippi EndhWhididd5 P. O. B O )(,q 6 4p) JACKSON, MISSISSIPPI 39205
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JAMES P. McGAUGHY, JR.
- sssT*w vice micem May 12, 1981
@\\'\\hI )D Office of Inspection & Enforcement r
U. S. Nuclear Regulatory Commission y
Region II 6-e,.
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101 Marietta Street, N.W.
JUL 3 01981 * -
nta, Georgia 30303 3
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A Attention:
Mr. J. P. O'Reilly, Director
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Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-81/01, Final Report, Transamerica Delaval Turbocharger Lubrication AECM-81/168 On January 2,1981, Mississippi Power & Light Company notified Mr. P. K.
VanDoorn, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns lubrication of the thrust bearings on Turbochargers manufactured by the Elliot Company for Delaval 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 correcting the above problem. We have determined that this deficiency is reportable under 10CFR50.55( e). Our final report on this matter is attached.
Yours trul
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p g J. P. McGaughy, Jr.
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Attachment l
cc: See page 2 9}l 6
8107310306 810512 PDR ADOCK 05000416 l
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Mr. J. P. O'Reilly AECM-81/168 NRC Page 2 cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Office of Inspection & Enforcement U. S. Nuclear Regu'atory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 o
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l Attachment to AECM-81/168 l
Page 1 of 1 FINAL REPORT FOR PRD-81/01 I.
Description of the Deficiency Transamerica Delaval notified the NRC on 12/16/80 of a 10CFR Part 21 condition, which identified a potential problem with lubrication of the thrust bearings of the turbochargers which could result in engine non-i availability. The engines identified with GGNS are SN70433/36 DSRV.
These turbochargers are manufactured by Elliot Company of Jeannette, Pa.
They were installed on the engines by Transamerica Delaval and l
lubri:ated in accordance with Elliot Company recommendations.
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The defect exists in the lubricating oil system that supplias oil to the j
turbocharger bearings. The design of this system permits lubricating
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oil to flow to the bearings only when the engine is running and prevents j
oil flow to the bearings when the engine is in the standby mode. 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 lubricating oil system is bypassed at this time.
l II.
Analysis of Safety Implications Engine tvailability could be affected if the defect e.oted by Delaval is
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not co...cted.
If these engines fail, then the Standby Diesel Generator System, which provides emergency power to safety related systems 7
required to operate for safe shutdown of the plant, would not be able to a
supply power in the event of the loss of offsite power. As such, the l
ability to safely shut down the plant and maintain it in a safe, i
shutdown condition would be impaired following a loss of offsite 9
power. The deficiency is therefore reportable under 10CFR50.55(e).
Since MP&L has not yet accepted the equipment, the deficiency is not reportable by MP&L under 10CFR21.
i III. Corrective Actions Taken Corrective actions include modifications to the lubrication oil system to permit lubrication oil to the thrust bearings of the turbochargers when the turbochar;er is at rest (engine standby mode). The drawings i
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and the parts list document this design change.
Our Constructor is proceeding to order parts to be installed on the Unit 1 engines t
immediately upon receipt and on the Unit 2 engines at the time of their erection. Projected completion dates are 9/15/81 for Unit 1 and 6/1/83 for Unit 2.
This design change is befrg specified for all engines to i
prevent future occurrence of this problem.
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