ML20086D665
| ML20086D665 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/19/1991 |
| From: | Tuckman M DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9111260213 | |
| Download: ML20086D665 (3) | |
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DUKE POWER -
November 19, 1991 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Subject. Catawba Nuclear Station, Unit 2 Docket No. 50-414 Special Report invalid Failure of Diesel Generator 2B l
Pursuant to Technical Specification 4.8.1.1.3 and 6.9.2, find attached a Special i
. Report concerning the Unit 2 Diesel Generator B (D/G 2B) invalid failure that occurred on October 19, 1991.
Very truly yours, n.s. %L M. S. Tuckman Vice President Catawba Nuclear Generation Department CRL/DG2B1119.91 Attachment l
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S. D. Ebneter Regional.Administrntor, Region II W. T. Orders Senior Resident Inspector R. E. Martin, ONRR i
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9111260213 9t1119 PDR ADOCK 05000414 4
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U. S. Nuclear Regulatoly Commission November 19, 1991 Page 2 bxc:
R. C. Futrell i
C. R. Lewis R. L. Gill J. W. Glenn E. M. Geddie Group File: 801.01 i
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SPECIAL REPORT CATAWil A NUCLEAR STATION DIESEL GENERATOR 211 INVALID FAILURE An invalid failure (start #652) of Diesel Generator (D/G) 2B occurred on October 19, 1991 at approximately 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br />.
The reverse power relay actuated while reducing D/G load prior to opening the D/G breaker. There have been zero valid failures in the past 20 valid starts and 3 valid failures in the past 100 valid starts for D/G 2B. The current test surveillance interval is once per thirty-one days which is in compliance with Technical Specification
- 4. 8.1.1.2, Table 4. 8-1.
Following successful completion of PT/2/A/4350/0G (4160V Essential Power System Test), the D/G load was being reduced to approximately 200 kW per normal operating procedures when the reverse power relay actuated, causing the D/G breaker to open.
The operator apparently reduced the load which the D/G was carrying to a level low enough to actuate the reverse power relay which tripped the D/G breaker.
This incident is classified as an invalid failure per Regulatory Guide 1.108, because the trip can be attributed to operator error.
In an effort to reduce the potential for this type of invalid failure, new operators are required to perform the paralleling and loading operation as part of their training requirements. Additionally, this incident and other similar reverse power relay actuations will be covered in the operator requalification program.
There is no unavailability time associated with this invalid failure since the reverse power relay trip circuitry is bypassed on an emergency start.
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