ML20245L189
| ML20245L189 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 04/28/1989 |
| From: | Blosser J UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 89-02, 89-2, ULNRC-1990, NUDOCS 8905050312 | |
| Download: ML20245L189 (3) | |
Text
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. [Jggog Etuernic a
l CMaway Plant April 28, 1989 U. S. Nuclear Regulatory Commission Document. Control Desk Washington, DC 20555 4
ULNRC-1990 Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 89-02 INVALID DIESEL GENERATOR 'A' FAILURE DUE TO PROCEDURAL INADEQUACIES WHICH LEFT SPEED CONTROL KNOB SET TOO HIGH TO PREVENT OVERSPEED TRIP The enclosed Special Report is submitted pursuant to Technical l
Specification 4.8.1.1.3 concerning the invalid failure of Diesel Generator (D/G) 'A' due to procedural inadequacies which did not adjust l
the speed control knob enough to prevent exceeding the overspeed trip i
setpoint. This invalid failure occurred while starting the D/G for a troubleshooting run.
1 J. D. Blosser Manager, Callaway Plant TPS/MKD:jlh Enclosure cc: Distribution attached
- f 8905050312 890428 PDR ADOCK 05000483 PNV m
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' Marirng Autitest P.O Box 620, Fulton, MO 65251 j
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l e-l cc distribution for ULNRC-1990 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 Dottle Sherman, Library Wolf Creek Nuclear Operating Corp.
The Exchange Suite 245 P. O. Box 411 270 Farmington Avenue Burlington, KS 66839 Farmington, CT 06032 Mr. Merlin Williams Manager, Electric Department Supt. of Regulatory Quality 6
)
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 j
Atlanta, GA 30339 Region III 1
799 Roosevelt Road NRC Resident Inspector Glen Ellyn, IL 60137 D. F. Schnell (400)
G. L. Randolph
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R. P. Wendling (470) l J. V. Laux
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A. C. Passwater/D. E. Shafer/D. J. Walker (470)
C. A. Hughes Z170.05 (QA Record)
Z40SR (Z170.09 Commercial Record)
M. S. Evans M. C. Taylor H. Wuertenbaecher, Jr. (100)
S. L. Auston (470)(NSRB)
S. J. Bellers/D. R. Delrichs E210.01 Z40ULNRC A160.761 N. Date (Sandra Auston) (470)
SPECIAL REPORT 89-02 INVALID DIESEL GENERATOR 'A' FAILURE DUE TO PROCEDURAL INADEQUACIES WHICH LEFT SPEED CONTROL KNOB SET TOO HIGH TO PREVENT OVERSPEED TRIP on 3/29/89, at 1430 CST, emergency diesel generator (D/G) 'A' tripped on overspeed while being started for a post maintenance and fuel system priming run.
This was an invalid failure which is reported per Technical Specification (T/S) 4.8.1.1.3.
Investigation revealed the speed knob on the D/G governor was not set low enough to allow the mechanical governor to catch the D/G before it reached the overspeed trip. The speed knob had been turned down two times per plant procedure OTN-NE-00001, " Standby Diesel Generation System".
- However, combined with the amount of fuel the D/G received on the start signal, the two turns were not sufficient to prevent the D/G from exceeding the overspeed trip setpoint.
The speed knob was turned down an additional eight to ten turns and the D/G was successfully restarted at approximately 1515. Procedure OTN-NE-00001 will be revised to require the speed knob to be rotated ten to 12 turns, then raised to normal before restoring the electric governor.
Prior to this event, the D/G had been declared inoperable at 0420 on 3/29/89 to permit maintenance on the fuel o!! transfer pump and the ventilation supply suction return air damper. The D/G 'A' was declared operable at 1743 on 3/29/89. The D/G was unavailable for 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> and 23 minutes. T/S 3.8.1.1 action statements were satisfied.
Since this failure occurred during a maintenance run and not during a valid test, the surveillance test interval of T/S Table 4.8-1 is not affected. This position is consistent with Regulatory Guide 1.108.C.2.e(7).
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 91 3*
5#
- Special Reports 84-02 6 87-10, LER 87-002
- Special Reports 85-01, 85-02, 85-07, 86-01 Surveillance tests are currently performed at least once per 31 days for D/G
'A'.
This is in conformance with the schedule in T/S Table 4.8-1 which requires a test intervaJ 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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