ML20043D163

Supplemental Special Rept on Test Failures of Div I Diesel Generator at Plant on 891220 & 900111.Problem Caused by Misapplication of Woodward EGB13P Model 9903-266 Governor. Mods Not Warranted.Diesel Generator Being Tested Weekly

ML20043D163
Person / Time
Site:	Clinton
Issue date:	05/30/1990
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-601678, NUDOCS 9006070194
Download: ML20043D163 (5)

Text

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. U-601678 .

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' .6018 POWER "'i"!

E CLINTON POWER STATION, P.O. HOX 678, CLINTON. ILLINOIS 61727 0678. TELEPHONE (217) 935 8881 -

i May 30, 1990  ;

b Docket 50 461  !

Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 l

Subject:

Special Report: Supplemental Report on Test Failures of the Division I Dianal Canarator at Clinton Power Station (CPS)

Dear Sir:

[

By SPECIAL REPORTS dated December 20, 1989, and January 11, 1990, Illinois Power (IP) reported valid test failures of the Division I  ;

diesel generator (DG1A) as a result of slow starts on November 20, 1989;

, December 11, 1989; and December 27, 1989. The January 11, 1990 SPECIAL REPORT identified that an Action Plan had been developed to identify the I

root cause and resolve those factors which may have contributed to the slow stcrts of DG1A. By supplemental SPECIAL REPORT dated March 29, 1990, IP provided the available results of those actions of the DG1A l Action Plan that were pending final resolution at that time.

DGlA Action Plan  ;

As discussed in the previous SPECIAL REPORTS, the DG1A slow start '

problem has not recurred subsequent to the replacement of the Woodward EGB13P Model 9903-266 governor on the 12 cylinder engine (DGIA utilizes ,

tandem 12 cylinder and 16 cylinder diesel engines). At the time of the March 29, 1990 supplemental SPECIAL REPORT, additional testing of the removed governor by the governor manufacturer was anticipated.- llowever, the Woodward Governor Company has informed IP that simulating tandem operation is not practical due to limitations in their testing equipment. Bench testing of an isolated unit at Woodward can only verify mechanical function and calibration of the governor, not system response. As previously reported, this bench testing has been performed. Other then suggesting that the removed governor be reinstalled on the CPS tanden diesel generator unit for in situ system response testing, Woodward has offered no additional testing method.

Operational and safety considerations preclude this type of in situ testing at CPS. Therefore, no additional testing of the removed governor is anticipated.

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((M 9006070104 900530 PDR ADOCK 05000461 #

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• i Conclusions Attachment 1 graphically depicts all start times of DG1A starts  ;

l (maintenance starts and valid tests) since January 1. -1989. The  ;

Woodward EGB13P Model 9903-266 governor un the 12 cylinder engine was ,

replaced on December 27, 1989. As of May 21, 1990, a total of 22 '

consecutive successful valid tests of DGIA have been completed since the last valid failure on December 30,-1989. Continued surveillance testing of DG1A in accordance with the Technical Specifications has confirmed that the DG1A slow start problem has been resolved. However, since

, several of the previously reported slow start events appeared.to have a time dependent characteristic, a graduated, incremental increase in test frequency is currently being evaluated for implementation. This incremental increase in test frequency will serve to confirm that the time dependent characteristic of the DGIA slow start problem has been resolved prior to resuming the normal monthly- surveillance test frequency, t

Pending any clarification to the contrary by Woodward, the root cause of the DGIA slow start problem is considered by IP to be misapplication of the Woodward EGB13P Model 9903 266 governor when used in tandem with the Woodward EGB13P Model 9903 265 governor. Unless the Model 9903 266 governor is demonstrated to be appropriate for a quick-start application on a tanden unit, use of this model governor at CPS i will continue to be prevented. [

IP has formally tequested that the Woodward Governoe Compiny ,

continue to investigate the acceptability of using EGB13P Model 9903 266 i governors in tandem with Model 9903 265 governors. As of the date of this letter, IP has not received any response from Woodward with regard to this concern. If information becomes available indicating a manufacturer's defect in material or procedure is the underlying cause of the DG1A slow starts, additional reporting will be performed as required by 10CFR21.

For purposes of failure reporting per Technical Specification 4.8.1.1.3, this investigation is considered complete. Plant modifications associated with resolution of this problem which were previously reported as being under development have been further evaluated by IP. A modification to provide continucas operation of the fuel priming pumps (Field Alteration DGF023) and a modification to the air start system piping (Field Alteration DGF022) have been determined not to be required. Therefore, these modifications are not scheduled to be implemented.

Addition C Information The current valid failure count for DGIA is zero in the last 20 valid tests performed and eight in the last 100 valid tests performed v dj 10 valid tests have been performed for DG1A since receipt of the opers*i.ig licenr.e) . Therefore, DG1A continues to be tested on a veckly basis in accordance with Technical Specification Table 4.8.1.1.2 1.

1.

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Sincer yo s.

F. . Spangenber , III Manager - Licensing and Safety ,

DAS/alh cc: NRC Clinton Licensing Project Manager NRC Resident Office '

Illinois Department of Nuclear Safety l

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. to U 601678 Page 2 of 2 Notes to Attachment 1

1. CPS Start No. 1 89 108 (April 7, 1989) - Classified as an invalid test since start was conducted as post-maintenance testing.

Report to the NRC not required.

2. CPS Start No. 1 89 113 (April 11, 1989) - Classified as an invalid test due to questionable General Electric Transient Analysis Recorder (CETARs) data.. In addition, test was conducted as maintenance action (overspeed trip check). Report to the NRC not required.

3. CPS Start No. 1-89121 (June 9,1989) - Classified as r.n it.. ~ id test since start was conducted as post maintenance testinb-Report to the NRC not required.

4. CPS Start No. 1 89 128 (October 19, 1989) - Classified as an invalid test since start was conducted as post maintenance testing. Report to the NRC not required.

5. CPS Start No. 1 89 132 (October 19, 1989) - Valid Failure.

Reported per IP letter U 601561 dated November 17, 1989.

6. CPS Start No. 1-89 136 (November 20, 1989) - Valid Failure.

Reported per IP letter U 601577 dated December 20, 1989.

7. CPS Start No. 1-89 143 (December 11, 1989) - Valid Failure.

Reported per IP letter U-601589 dated January 11, 1990.

8. CPS Start No. 1 89 156 (December 27, 1989) - Valid Failure.

Reported per IP letter U 601589 dated January 11, 1990.

. . . .