ML20247L008
| ML20247L008 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/24/1989 |
| From: | Blosser J UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 89-03, 89-3, ULNRC-2044, NUDOCS 8908010123 | |
| Download: ML20247L008 (4) | |
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- CMaway Plant July 24, 1989 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 ULNRC-2044 Gentlemen:
DOCKET NUMBER'50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 89-03, REV. 1 VALID DIESEL GENERATOR 'A' FAILURE DUE TO WATER LEAKING FROM THE EXHAUST VALVE COOLING JUMPERS INTO THE ROCKER ARM LUBE OIL RESERVOIR The enclosed Special Report is submitted pursuant to Technical Specification (T/S) 4.8.1.1.3 concerning the valid failure of Diesel Generator (D/G).'A' due to a leaking 0-ring on the exhaust valve cooling water jumpers which allowed water to leak into the rocker arm lube oil reservoir. This revised report changes the' utility's previous determi-nc; ion of an invalid failure to a valid failure. This change was based on the criterion provided.by a July 20, 1989 letter from the Director, Project Directorate III-3, office of Nuclear Reactor Regulation.
J. D. Blosser Manager, Callaway Plant
- 5 TPS/MKD: jew Enclosure cc: Distribution attached 8908010123 890724 ICgA PDR ADOCK 05000483 S
PDC s
MaHing Athess: P.O. Box 62Q Fultan, MO 65251
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.s cc distribution for ULNRC-2044
'Mr. A. Bert Davis Mr. Thomas Alexion (2 copies)
Regional / administrator Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission U. S. Nuclear Regulatory Commission Region III
. Mail Stop 13-E-21 799 Roosevelt Road Washington, D.C.
20555 Glen'Ellyn, IL 60137 American Nuclear Insurers Mr. O. Maynard c/o Dottie Sherman, Library Wolf Creek Nuc19ar Operating Corp.
The Exchange Suite 245 P. O. Box 411 270 Farmington Avenue Burliugton, KS 66839 Farmington, CT 06032 Mr. Merlin Williams
~ Manager,, Electric Department Supt. of Regulatory Quality &
Missouri Public Service Commission Administrative Services P. O. Box 360 Wolf Creek Nuclear Operating Corp.
Jefferson City, MO 65102 P. O. Box 411.
Burlington, KS 66839 Records Center Institute of Nuclear Power Operations Mr. R. W. DeFayette Suite 1500 Chief, Project.Section 3A 1100 Circle 75 Parkway U.S. Nuclear Regulatory Commission Atl1nta, GA 30339 Region III 799 Roosevelt Road NRC Resident Inspector Glen Ellyn, IL 60137 D. F. Schnell (400)
G. L. Randolph R. P. Wendling (470)
J. V. Laux A. C. Passwater/D. E. Shafer/D. J. Walker (470)
G. A. Hughes Z170.05 (QA Record)
'Z40SR (Z170.09 Commercial Record)
M. S. Evans D. E. Young H. Wuertenbaecher, Jr. (100)
S. L. Auston (470)(NSRB) l S. J. Bellers/D. R. Delrichs E210.01 Z40ULNRC A160.761 l
N. Date (Sandra Auston) (470) w-___
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.t SPECIAL REPORT 89-03, REV. 1 l
VALID DIESEL GENERATOR 'A' FAILURE DUE TO WATER LEAKING FROM WE EXHAUST VALVE COOLING JUMPERS INTO THE ROCKER ARM LUBE OIL RESERVOIR On 3/30/89, at 0430 CST, emergency diesel generator (D/G)
'A' was declared inoperable due to cooling water leaking from the exhaust valve cooling water jumper 0-rings on cylinder #8 into the rocker arm lube oil reservoir. This l
is considered a valid failure which is reported per Technical Specification (T/S) 4.8.1.1.3.
This condition was discovered when the rocker arm lube oil reservoir high-high level alarm sounded. Approximately li gallons per hour of jacket water was estimated to be leaking into the rocker arm lube oil reservoir.
The rocker arm lubrication system is designed to collect all the oil which has been pumped to the rockers and return that oil to the rocker arm lube oil reservoir. From the rocker arm lube oil reservoir, the oil is pumped'through paper element filters back to the rockers.
Giver th!.s condition, upon an D/G engine start, the rocker arm pump would have begun pumping the water in the rocker arm lube oil reservoir through the filters. This amount of water would swell the filter elements stopping all flow. The rocker lube oil pump has an internal relief valve which will relieve back to the pump suction. No oil would be delivered to the rockers.
In this mode of operation, the D/C will start and load as usual, and could run for approximately one hour without failing. Eventually, however, the rockers would seize and the D/G would fail. The engine could not be relied upon to perform its safety function.
The 0-rings were found to be hardened, allowing the water te leak by.
The leaking 0-ring on the exhaust valve cooling jumper was replaced. The rocker arm reservoir was drained and filled with appropriate lubricant. All remaining exhaust valve cooling jumper 0-rings, on bcth D/G 'A' and
'B', were replaced. An Emergency Diesel Generator Reliabilit, study is currently being undertaken. Part of the scope is to enhance the inste11ation duration for engine 0-rings.
Procedure MSM-KJ-QK001, " Emergency Diesel Generator Inspec-tion", will then be revised to reflect the appropriara iurr' ion.
The D/G 'A' was declared operable at 0930 on 3/31/P9. The D/G was unavail-able for 29 hours3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br />. T/S 3.6.1.1 action statements 5 ze satisfied. Per discussions with the office of Nuclear Reactor Regulation (documented by the 7/20/89 letter from John N. Hannon), "the iiscovery of conditions that are automatically alarmed or found.
ing 1:
tions, when the diesel generator unit is on standby, that would have resulted in the failure of the diesel generator unit during test or during response to a bona fide signal, should be considered a valid test and failure."
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SPECIAL REPORT 89-03, REV. 1 VALID DIESEL GENERATOR 'A' FAILURE DUE TO WATER LEAKING FROM THE EXHAUST VALVE COOLING JUNTERS INTO THE ROCKER ARM LUBE OIL RESERVOIR The starting history of D/G
'A' as of.this report date is summarized as follows:
No. of No. of Failures No. of Failures Valid Tests During Valid Tests During Invalid Tests 94 4*
6#
Last 20 1
2
- Special Reports 84-02 & 87-10, LER 87-002 l
- Special Reports 85-01, 85-02, 85-07,.86-01, 89-02, 89-07 Surveillance. tests are currently performed at least once per 31 days for 3/G
'A'.
This is in confermance with the schedule in T/S Table 4.8-1 which requires a test interval of not more than 31 days if the number of failures in the last 20 valid tests is one or less or the number of failures in the last 100 valid tests is four or less.
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