ML20043H992

Special Rept 1-90-04:on 900523,valid Diesel Generator 1B Tripped.Caused by Replaced Jacket Water Temp Switches.Onsite Calibr Procedure Revised to Provide Technique Consistent W/ Actual Operating Conditions

ML20043H992
Person / Time
Site:	Vogtle
Issue date:	06/22/1990
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
0447, 1-90-04, 1-90-4, 447, ELV-01793, ELV-1793, NUDOCS 9006270173
Download: ML20043H992 (2)

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Georg:a Power Company . 1

. , 333 Piedmont Awnuo ! . 'r

<* ' . - Attanta, Geof0 a 30308 1 +

' Telephone 404 520-3195l- t

. Mading Addressi.

40 invctness Center Parkway Post Offce Box 1295 .

Bamsngham, Alabama 35201

' Telephone 205 BGB 5581 June 22, 1990. 't mwe" <*ac snte"

' W. G. Hairston.111 tF i Scruor Vce President -

' i, Nuclear Operations ELV-Ol F - C 0447

-Docket:No..: 50-424 U. S. Nuclear Regulatory Commission ATTN: : Document Control Desk

' Washington, D. C. 20555 Gentlemen:' .

V0GTLE ELECTRIC GENERATING PLANT-SPECIAL'REPORTi VALID DIESEL GENERATOR FAILURE i

In accordance with the requirements of the Vogtle' Electric Generating Plant Technical ~ Specifications,- Sections 4;8.~1.-l.3 and 6.8.2, Georgia Power Company hereby submits the enclosed:Special- Report;concerning a valid' diesel ~ generator failure.

Sincerely, W..M u>

W. G. Mairston, III WGH,III/NJS/gm- 1

Enclosure:

Special Report 1-90-04 xc: Georaia Power ComERDX ,

Mr. C. K.-McCoy Mr.-.G. Bockhold, Jr.

Mr.- P. D. Rushton s Mr. R.~M. Odom 4 o NORMS  :

U. S. Nuclear Reaulatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. T..A.-Reed, Licensing Project Manager, NRR .;

Mr. B. R. Bonser, 'Seniar Resident Inspector,' Vogtle i

jl j

9006270173 900622 PDR

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S ADOCK 05000424 PDC p-

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j ENCLOSURE L V0GTLE ELECTRIC GENERATING PLANT.- UNIT 1- 1 TECHNICAL-SPECIFICATION SPECIAL REPORT 1-90-04 VALID DIESEL GENERATOR FAILURE

'A. REQUIREMENT FOR REPORT l I This' report.is~ required in accordance.with the Vogtle Electric. Generating  !

Plant Technical Specifications, Section 4.8.1.1.3.' This; section of the Technical Specifications requires that all diesel generator. failures,- t valid or non-valid, be reported to:the Commission in.a Special Report pursuant to Technical Specification 6.8.~2.

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B.- DESCRIPTION OF VALID FAILURE FOR DIESEL GENERATOR 18 -

On 5-23-90,.at 1226 CDT, Diesel Generator (DG) 1B was started pursuant to a normal routine Technical Specification surveillance requirement. Just arior to this surveillance test, the jacket water temperature switches y 1ad been replaced with recalibrated ' switches as'.part of a DG reliability upgrade and the DG had been declared operable. .At 1228.CDT;, DGlB tripped R i and the following alarms were noted: "Lo Turbo Oil Pressure,":"Hi Jacket l Water Temp.," and "Lo Jacket Water Pressure". Several troubleshooting- i n

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starts were made and it was determined that the jacket water temperature switches were the. source of-the trip signal. On 5-24-90, the original .

jacket water temperature switches were reinstalled on CGlB.- Both normal:

and emergency starts were successfully conducted and DG1B was-returned:to L service the same day at 2254 CDT. During this time Diesel-Generator 18-l was unavailable for emergency operation' for a period of- 34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br /> and 26 minutes, s l

The jacket water temperature. switches were tested by anLindependent laboratory and the trip setpointsiwere determined to-be~31-36 degrees F.

i less than:the required.200 degree F,setpoint. The'.onsiteLcalioration i; . procedure has.been revised to provide a technique-that'is consistent with i the actual operating conditions that the switches experience.

C.

SUMMARY

b This event is classified as a -valid failure per Reg. Guide 1.108, Section '

C.2.e. Since this is the second valid' failure in the past 20 valid tests, the test frequency for DGlB-has been changed to- once per 7. days in accordance.with Table 4.8-1.of the Technical Specifications. As of.

. 5-23-90, there have been a total of 71 valid tests of DGlB-and 5 valid

, failures, l q k

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