ML20215C544
| ML20215C544 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/03/1986 |
| From: | Rice P GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-86-382-000 GN-1207, PT21-86-382, PT21-86-382-000, NUDOCS 8612150232 | |
| Download: ML20215C544 (5) | |
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Georgia Power Company hMb Post Off:03 Box 282
.."Th Waynesboro. Georgia 308so Te+ephorn 404 054 9961, Ext. 3360 404 724-8114, Ext. 3360 -
MC8 P 2 ; QorgiaPower P. D. Rice y,Ptes p
tM swmm wtrc sistem December 3,1986 United States Nuclear Regulatory Commission Region II File: X78G03-M122 Suite 2900 Log:
GN-1207 101 Marietta Street, Northwest Atlanta, Georgia 30323
Reference:
Vogtle Electric Generating Plant-Units 1 and 2; 50-424, 50-425; Containment Cooler Bearing Cavity Lubricant; Letter GN-1068, dated September 5,1986 Attention: Mr. J. Nelson Grace In previous correspondence, Georgia Power Company described a
- potentially reportable condition concerning the lubricant used in the bearing cavity of the containment cooler fan motors.
Georgia Power Company has completed its evaluation and determined that a reportable condition as defined by the reporting criteria of Part 10 CFR 50.55(e) does exist.
However, a reportable condition as defined by the reporting criteria of Part 10 CFR 21 does not exist since this condition does not represent a significant defect in a vendor supplied component.
A summary of our evaluation is attached.
This response contains no proprietary information and may be placed in the USNRC Public Document Room.
Yours truly, A. :.0m P. D. Rice REF/PDR/tdm 8612150232 861203 DR ADOCK 0500 4
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Attachment xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 H. G. Baker D. R. Altman L. T. Gucwa J. P. O'Reilly P. R. Bemis C. W. Hayes G. F. Head J. A. Bailey G. A. McCarley R. E. Conway
- 0. Batum R. W. McManus R. H. Pinson G. Bockhold Sr. Resident (NRC)
C. W. Whitney C. E. Belflower C. C. Garrett (OPC)
B. M. Guthrie J. F. D'Amico J. E. Joiner (TSLA)
D. E. Dutton W. D. Drinkard D. F$1g (GANE)
W J2 '[
e+-a R. A. Thomas E. D. Groover NORMS J
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EVALUATION OF A POTENTIALLY REPORTA8LE CONDITION CONTAINMENT COOLER BEARING CAYITY LUBRICANT' Initial Report: On August 6, 1986, Mr. R. E; Folker, Vogtle' Project Quality Assurance. Engineer, informed Mr.
E.
F.
Christnot of the USNRC-Region!!! of. a potentially reportable condition concerning the lubricant used in the bearing ~. cavities of the containment cooler fan motors.
This condition. was. initially identified during Construction Acceptance Testing and -was documented in Operations. Deficiency Report ODR-T-1-86-1497 which indicated that the manufacturer's recommended
= lubricant was not used.
In subsequent correspondence, Georgia Power Company indicated that the NRC could expect to be informed of the results of the evaluation of this condition by, December 3,1986.
4-Background -Information: The containment cooling system consists of eight safety-related cooling units.
The cooling units are divided
[
- into two trains, A and B, with each train consisting of four cooling units.
During normal operation, each train has the capability of maintaining air temperature at or below the normal design temperature of 120*F.
The auxiliary air cooling system is used during normal operation, if necessary, to assist in maintaining this temperature.
Either train of cooling units in conjunction with the nuclear service cooling water system, and containment spray system, has sufficient capacity to. cool the air. in the containment and to ensure that the.
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containment pressure is below the design pressure during accident conditions.
Each containment cooler is identical in physical design, i
It contains a motor in the air stream with a direct driven fan.
The shaft is supported by the motor bearings.
Each bearing has a lubrication i
fill line that connects to the bearing cavities.
Review of construction maintenance records by Nuclear Operations for the containment coolers during construction turnover revealed that the manufacturer's recommended bearing lubricant identified in the operating and maintenance instruction manual (Chevron SRI #2) was not used by construction during routine storage maintenance.
Nuclear Operations' sampling of the bearing lubricant for all eight containment coolers indicated that the bearings on five fans contained other greases in addition to Chevron SRI #2.
Removal of the end bells on the outboard i-bearing of the containment coolers also indicated the presence of rust on the motor internal casing of one of the fans (Tag No.1-1501-A7-005).
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Additional sampling was performed to determine the extent of this problem j
and whether or not it was limited to the containment coolers.
The results of the sampling indicated that the supplier's recommended lubricant was also not used in the piping penetration area filtration fan coolers.
Futhermore, additional review of maintenance records and visual inspections indicated that this condition existed in other l'
safety-related HVAC fan motors.
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Engineering Evaluation: Use of unapproved lubricants and mixing of i
lubricants could result in accelerated bearing wear and/or corrosion i
of the bearings due to deterioration of the lubricants.
The accelerated bearing degradation could result in bearing overheating which could result in motor failure and, ultimately, cooling unit failure.
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Consequently, the. safety-related function of the cooling units could i
be jeopardized..
Quality Assurance program Breakdown Evaluationi The Construction.
Acceptance Testing Program provided for the verificatio'n of lubricationi in fan motor : bearings.
These provisions worked properly to identify the lubricant mixing problem and bring about its resolution.
Therefore, breakdown in the Georgia Power Company QA Program did a significant not occur.
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==
Conclusion:==
Based on the above evaluation, the plant safety could have been impacted had the condition gone uncorrected.
The root cause of '
this condition was due to a variance in the vendor's In-Storage and Maintenance / Operating manuals regarding lubrication requirements which was not appropriately resolved, resulting in the use of an. unapproved lubricant.
Therefore, Georgia Power Company has conc hded that a i
reportable condition as defined by the reporting criteria of Part 10CFR50.55(t) does exist.
However, since this condition' does not indicate a significant defect in a vendor supplied component, it does not represent a reportable condition as defined by Part 10CFR21 criteria.,
J Corrective Action:~ Bearings for five. Unit I containment cooler fans were replaced and the proper lubricant specified in the operating and maintenance instruction manual was used to eliminate this problem.
Rather than continuing the inspection and sampling of each fan motor to determine whether the approved grease was used, a decision was mde j
by Nuclear Operations to replace the Unit 1 and common safety-rela?,ed fan bearings outside the containment except for the diesel : generator building emergency fans.
The diesel generator building emergency fan The bearings were inspected and found to have no unapproved grease.
status of the corrective actions as of October 31. 1986, for Unit 1 and common safety-related fans is summarized in Table 1.
The Maintenance i
Work Orders and an Operations Deficiency Report are identified for those corrective actions yet to be completed.
4 The containment fan motor which was found to have rust on the motor internal casing was replaced with a Unit 2 motor.
Inspection of additional motors indicated that this is an isolated case ;related to the storage of this item and the corrosion was not related to the addition of unapproved grease.
The Unit 2 safety-related fans are scheduled to be inspected by GPC Construction by December 31, 1986, to identify applications where f
unapproved lubricants might have been used.
Upon conclusion of this task, appropriate corrective actions will be performed and tracked l
by means of deviation reports.
A PCW action item i 281586 was generated to ensure that the inspection for Unit 2 bearingsf is completed and deviation reports initiated for tracking corrective actions which will be complete commensurate with Unit 2 Construction schedules.
The storage instruction manuals have been revised to make reference i
to the operating and maintenance instruction manuals relative' to lubrication requirements for safety-related fan motors.
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TABLE 1 UNIT 1/ COMMON "Q" HVAC FANS CORRECTIVE ACTION STATUS-IBEARINGS i BEARINGS i BEARINGS i INOT TO bel ALREADY l
To BE l
NOTE 1 EQUIPMENT TA0 #
l REPLACED i REPLACED 1 REPLACED l COMMENTS 1-1501-A7-001 X
1-1501-A7-002 X
1-1501-A7-003 X-1-1501-A7-004 X
1-1501-A7-005 X
NOTE ?
1-1501-A7-006 X
NOTE 3 1-1501-A7-007 X
NOTE 3 1-1501-A7-008 X
NOTE 3 1-1516-B7-001 X
X Mf0 186 22692 1-1516-87-002 X
MWO 186 19879 1-1531-87-002 X
MWO 186 19878 1-1531-87-004 X
MWO 186 19880 1-1531-B7-005 X
MWO 186 19681 1-1531-87-006 X
MWO 186 14404 1-1531-N7-001 X
MWO 186-14402 1-1531-N7-002 X
MWO 186 19875 1-1532-87-001 X
MWO 186 19877 1-1532-87-002 X
MWO-186 19833 1-1532-B7-003 X
MWO 186 19876 1-1532-B7-004 1-1539-A7-001 X
1-1539-A7-002 X
1-1539-A7-005 X
1-1539-A7-006 X
X MWO 186 14841 1-1540-87-001 X
MWO 186 19837 1-1540-B7-002 X
MWO 186 19838 1-1540-B7-003 X
MWO 186 19839 1-1540-87-004 X
MWO 186 19840 1-1540-87-005 1-1532-A7-001 X
1 -1532-A7-002 X
1-1561-NT-001 X
1-1561-N7-002 X
A-1542-N7-001 X
A-1542-N7-002 X
1-1562-N7-001 X
MWO 186 14400 1-1562-N7-002 X
MWO 186 14399 1-1593-87-001 X
ODR T-1-86-3995
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TABLE 1 UNIT 1/ COMMON "Q" HVAC FANS CORRECTIVE ACTION STATUS IBEARINGS i BEARINGS i BEARINGS i
!NOT TO bel ALREADY TO BE l
NOTE 1 g
EQUIPMENT TAG #
! REPLACED I REPLACED ! REPLACED l COMMENTS 1-1593-B7-002 X
ODR T-1-86-3995 1-1555-A7-001 X
1-1555-A7-002 X-1-1555-A7-003 X
S 1-1555-A7-004 X
1-1555-A7-005 X
j 1-1555-A7-006 X
g 1-1555-A7-007 X
i 1-1555-A7-008 X
1-1555-A7-009 X
1-1555-A7-010 X
4 1-1555-A7-011 X
1-1555-A7-012 X
1-1555-A7-013 X
1-1555-A7-014 X
1-1555-A7-015 X
1-1555-A7-016 X
i 1-1555-A7-017 X
ig 1-1555-A7-018 X
1-1566-87-001 X
NOTE 3 '
1-1566-B7-002 X
NOTE 3 1-1566-B7-003 X
NOTE 3 3-1566-B7-004 X
NOTE 3 NOTES:
1.
MWO: Maintenance Work Order;0DR:
Operations Deficiency Report.
Corrective actions for all MW0s and the ODR are scheduled to be completed prior to Unit I fuel load.
2.
Replaced with Unit 2 motors.
3 Bearings need not be replaced because inspection indicated no grease mix problem.
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