ML20136B394
| ML20136B394 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 11/04/1985 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-85 NUDOCS 8511200199 | |
| Download: ML20136B394 (7) | |
Text
{{#Wiki_filter:. 9 fiECElVED imC em unumi M -{N amms Go. OV -G PH 12 E N Bart D. Wnhers Vce President NE0!O?l\\!IM November 4, 1985 Trojan Nuclear Plant Docket 50-344 License NPF-1 Mr. John B. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Consission 1450 Maria Lane, Suite 210 Walnut Creek CA 94596-5368
Dear Sir:
TROJAN NUCLEAR PLANT 10 CFR 21 Defect Report Speed Increaser Gear Drive The attached 10 CFR 21 Defect Report identifies a defect which we have evaluated to be reportable in accordance with 10 CFR 21 requirements. Our initial evaluation in April 1985 did not consider this item to be sig'tifi-cant since the defect affected only one of the three speed increasers at Trojan, did not appear to be generic, nor was it clear that the details of keyway design were considered to be deviations from specifications in a procurement document. However, as a result of discussions with representa-tives of the Vendor Programs Branch during the recent inspection of PGE's vendor interfaces (reference Inspection Report 50-344/85-25), we have reevaluated our 10 CFR 21 report procedure and have reexamined recent Plant events for which 10 CFR 21 evaluations were appropriate. The results of this reevaluation were brought to my attention on November 4, 1985. I have concluded that the deviation related to the speed increaser used on each of the centrifugal charging pumps and the diesel-driven auxil-incy feedwater pump should be reported as a defect under the requirements of 10 CFR 21. 8511200199 851104 PDR ADOCK 05000344 S PDR 1g 121 S W Sam:;n Smet. Pomori Oregon 97204 r 6 M.' nea ~ v'
i UM Mr. John B. Martin November 4, 1985 Page 2 Please direct any questions you may have regarding the technical issues to the Trojan Nuclear Plant General Manager, Mr. W. S. Orser. i Sincerely, Bart D. Withers Vice President Nuclear 1 Attachment Director, Inspection and Enforcement c: U.S. Nuclear Regulatory Cotanission Washington DC 20555 Mr. Lynn Frank, Director State of Oregon Department of Energy i I 4 -r,,-,--. 4 +mw,m.,--m----. r.w-~- ,.,e_. ..r,,-m--.-----e--,, e,----~ -.. -..- -. - ~_
10 CFR 21 DEFECT REPORT Portland General Electric Cempany Report Nunber:85-01 121 SW Salmon Street. Report Date: November 4, 1985 Portland, Oregon 97204 TROJAN NUCLEAR PLANT Responsible Officer: Mr. B. D. Withers, Vice President Nuclear Date Responsible Officer Received Information: Novenber 4, 1985 Basic Component or Activity: Speed Increaser Gear Drive 'Model SU-1023-8x and SU-16-10 Lube 011 Pump Coupling Keyway and Key Firm Supplyinn Basic Component: Nuttall Gear Corporation 2221 klagara Falls Boulevard PO Box 1032 Niagara Falls, New York.14302 Formerly owned by the Westinghouse Electric Corporation, Buffalo, New York Description of Defect and Substantial Safety Hazard That Could be Caused: During maintenance inspection of the speed increaser gear drive on the "B" train centrifugal charging pump, it was discovered thatfthe keyway on the low speed shaft that drives the speed increa'ser lube oil pump had been machined approximately 2-1/2 inches in length. This allowed the shaft coupling key, approximately 1-inch in length, to move down the key-way and become almost totally disengaged. The key was estimated to have only a 1/32-inch engagement when the condition was discovered. The ' apparent defect is that the keyway length is sufficient to permit the key to move from the coupling to a point of total disengagement. This defect is applicable to both models of the speed increaser used at Trojan. Upon disengagement of the key, the lube oil pump could fail to operate and the speed increaser fail due to lack of proper lubrication. The speed increaser is used to couple the electric motor and centrifugal charging pump. Assuming a single failure of one centrifugal charging pump, this defect could have resulted in the loss of the high head safety , injection' capability. This potential loss of the high head safety injec-tion system is considered to meet the definition of a substantial safety hazard. Number and Location of Such Components in Use at the Trojan Nuclear Plant: The Trojan design (Four-Loop Westinghouse pressurized Water Reactor) utilizes the Model SU-1023-8K Speed Increaser on the "A" and "B" train centrifugal charging pumps and a Model SU-16-10 Speed Increaser on the diesel-delven auxiliary feedwater pamp.
Page 2 Corrective Action The key was replaced with a longer key and the keyway was staked to pre-vent movement of the key. The other speed increasers were inspected and the keys were found properly engaged in the shaft coupling. However, the keys were replaced with longer keys and the keyways were similarly staked to prevent key movement. Other Pertinent Information: Th's defect was identified as a result of inspections performed to deter-mine the lube oil pin coupling wear. Excessive pin coupling wear at the Almaraz and D.C. Cook facilities had been reported to PCE by Westinghouse letter dated February 12, 1985. Westinghouse Technical Bulletin 85-19 dated September 24, 1985 provides detailed information regarding the cor-rective action to be taken to monitor coupling pin wear. Pin wear on the three lube oil pumps at Trojan was found to be normal with pin replace-ment not required,. The keyway defect was discussed with the Nuttall Gear Corporation upon discovery. They indicated that this was the first time that the key / keyway problem had ever been reported to them. We informed them that a 10 CFR 21 evaluation would be processed in accordance with PGE procedures. PGE has placed on the INPO Network an Operating Plant Experience Report to all plants responding to the Westinghouse Technical Bulletin 85-19. This report describes the Trojan finding and alerts other facilities to the potential problem. For reference, Figures 5 and 8 from the Instruction Book, IB 3700-SU-1A, applicable to the high speed gear drives, Type SU, are provided as an attachment to this 10 CFR 21 Defect Report. MHM/kal 15300,1085
1.3. 3700-SU-1A MAINTENANCE INSTALLATION
- OPERATION l]
_A INSTRUCTIONS 4 i I i HIGH-SPEED i ~O GEAR DRIVES Type SU WESTINGHOUSE ELECTRIC CORPORATION ) BUFFALO PLANT e MOTOR AND GEARING DEPT. BUFFALO 5, N.Y. SUPERSEDES 1.B. 3700-SU-1 DECEMBER,1958 Friat.d in U.S.A.
I I e g ' ~ % I f l i ^=' l I. 4 TIC. S. En Type Coupling el Pump to Low-Speed Shaft Location of'10 CFR 21 Defect The key, keyway, shaft and drive coupling: Keyway on the Low-Speed Shaft was found to be cut approximately 2 1/2 inches in length. Key was approximately 1 inch in length, the same width as the female drive coupling. I l
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- 9. OtL PUMP
- 1. LOW-SPEED BEARING
- 10. OIL COOLER
- 2. HIGH SPEED BEARING ll. OIL STRAINER BASKET
- 3. LOW SPEED EXTENSION KEY (2. OIL PUMP PINION
- 4. HIGH SPEED EXTENSION KEY
- 13. OIL PUMP PINION KEY M S. LOW-SPEED SHAFT I4. OIL PUMP GEAR f 6. LOW SPEED GEAR
- 15. PRESSURE GAUGE
- 7. GEAR KEY M 8. HIGH-SPEED PINION SHAFT 4 ITEMS 5 TO 8 COMPRISE A UNIT AND ARE NOT FURNISHED SEPARATELY.
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