ML20214K405
| ML20214K405 | |
| Person / Time | |
|---|---|
| Issue date: | 08/14/1986 |
| From: | Merschoff E, Trottier E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| Shared Package | |
| ML20214K392 | List: |
| References | |
| REF-QA-99900759 NUDOCS 8608210070 | |
| Download: ML20214K405 (5) | |
Text
{{#Wiki_filter:,.. f. q ,I ORGANIZATION: WOODWARD GOVERNOR COMPANY FORT COLLINS, COLORADO REPORT INSPECTION [NSPECTION NO.- 99900759/85-01 DATE: 12/19-20/85 JN-SITE HOURS-20 CORRESPONDENCE ADDRESS: Woodward Governor Company ATTN: MR. J. L. Veitch Quality Assurance Manager ) 1000 East Drake Road Fort Collins, Colorado 80525 ORGANIZATIONAL CONTACT: James L. Veitch TFIFPHONF NINRFQ-(101) dR7.6R11 l NUCLEAR INDUSTRY ACTIVITY: Governors on prime movers used to power standby diesel generators and ECCS pumps. l l I'[/ll6M ASSIGNED INSPECTOR: E. H. Trottier, Reactive Inspection Section (RIS)' Date OTHERINSPECTOR(S): W. P. Haass, Program Coordination Section ngineer, Brookhaven National J. C. Higgins, Nu ear Lab at M hd4 fC ./- APPROVED BY: Date E. W. Merschoff, Chief ( RIS, Vendor Program Branch INSPECTION BASES AND SCOPE: A. BASES: 10 CFR Part 50, Appendix B and 10 CFR Part 21. This inspection was conducted to establish the Woodward Governor SCOPE: B. Company contribution, if any, to the governor malfunction and subsequent overspeed event that occurred to a Transamerica Delaval, Incorporated (TDI) standby diesel generator at Grand Gulf Nuclear Station on November 6, 1985. Virtually every commercial nuclear power plant (under PLANT SITE APPLICABILITY: construction or operating) has a diesel generator equipped with a Woodward governor. 8609210070 860014 CO D
e 4 F ORGANIZATION: WOODWARD GOVERNOR COMPANY FORT COLLINS, COLORADO REPORT INSPECTION NO - 49900759/85-01 RESULTS: pAGE 2 of 3 A. VIOLATIONS: No violations were identified as a result of this inspection. B. NONCONTORMARCES: No nonconformances were identified as a result of this inspection. C. UNRESOLVED ITEMS: In November,1985, a failure of one standby diesel generator occurred at the Grand Gulf Nuclear Station. The failure happened during post-main-tenance testing that was intended to demonstrate the diesel generator was ready to return to service. However, the Woodward governor had been drained of oil as part of the maintenance activity, but was not properly refilled. In the absence of other precautions to limit engine speed on the initial re-start, the lack of oil in the governor allowed the engine to accelerate at a high rate before reaching the mechanical overspeed trip setting. The high rate of acceleration, coupled with trip system delays, allowed the diesel engine spee.d to substantially overshoot the trip setpoint and thus sustain considerable damage. Although the engine was supplied by another vendor (Transamerica Delaval, Inc.) the maintenance that had been performed was on the Woodward governor. Further, the Woodward technical manual from which the Grand Gulf mainter,- ance procedure was drafted, was out of date. Woodward has written a separate technical manual for each of their supplied components. Components typically supplied with nuclear standby engines are the: governor / actuator, servo-booster, overspeed trip device, elec-tronic control box, remote oil cooler. These manuals are supplied to customers (diesel engine manufacturer) with the purchased equipment and are periodically revised and updated. Most all have had significant revisions in the last few years to add better guidance, cautions, and warnings. However, these revised man'uals are not automatically distri-Instead, they are available upon request and are buted to past customers. supplied with new purchases, as well as with overhauled or repaired l components. The new manuals are noticeably improved over previous revi-sions and provide valuable guidance in the operation and care of governor components. In discussions with Woodward management, the Inspector was l advised of Woodward's willingness to provide any revised manual at any l Woodward's position is that in the absence of such a time on request. l request, they have no knowledge of which diesel generators at which plants received which governors from the diesel generator supplier.
s } ORGANIZATION: WOODWARD GOVERNOR COMPANY FORT COLLINS, COLORADO INSPECTION REPORT PAGE 3 of 3 NO.? 99900759/85-01 RESULTS: Toward that end, Woodward and Transamerica Delaval. Inc. have agreed to cooperate in establishing the serial number, location and revision status The NRC of the governor manual held by TDI nuclear power plant customers. has assisted in this by issuing Information Notice 86-07, which informs all licensees of this effort. D. OTHER FINDINGS AND COMMENTS: In reviewing the root cause of the improper oil fill, it was noted that the (outdated) component manual for the Woodward governor did not contain in-formation on oil capacities..This is particularly important on TDI engines, because they are fitted with a remote oil cooler for the governor. The remote oil cooler and its tubing connections to the governor further Although later revi-compound the problem of achieving a proper refill. sions to Woodward governor component manuals are better written and provide more detailed maintenance information, they do not contain component oil capacities. Woodward has agreed to supply this information on request as mentioned in Section D of this report. In addition, Woodward intends to include component oil capacities in the next revision of component manuals. i (
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