ML20203K979
| ML20203K979 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 04/23/1986 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Randazza J Maine Yankee |
| References | |
| IEIN-86-019, IEIN-86-19, NUDOCS 8605010099 | |
| Download: ML20203K979 (3) | |
Text
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April 23,1986 s
C Docket No. 50-309 6 i C.
Mr. J. B. Randazza Executive Vice President Maine Yankee Atomic Power Company 83 Edison Drive Augusta, Maine 04336
Dear Mr. Randazza:
SUBJECT:
SAFETY SIGNIFICANCE OF REACTOR COOLANT PUMP SHAFT INTEGRITY ISSUE You have recently received IE Information Notice 86-19, REACTOR COOLANT PUMP SHAFT FAILURE AT CRYSTAL RIVER, which was issued on March 21, 1986. The IE Information Notice provides notification of failure of a reactor coolant pump (RCP) shaft manufactured by Byron-Jackson Company.
In summary, on January 1, 1986, Reactor Coolant Pump (RCP) "A" shaft at Crystal River, Unit 3 failed completely within the hydrostatic bearing.
Subsequent inspections of the shafts of the other three RCPs revealed crack indications in all shafts.
j Also all eight cap bolts securing the impeller to the shaf t on the "A" and "B" pumps were found to be cracked in multiple places (some were broken) and five of eight pins which take the torque between the impeller and the shaft on "A" and "B" pumps were cracked.
Crystal River 3 plant has a B&W NSSS.
The RCPs are Byron-Jackson, type DFSS vertical centrifugal pumps.
The shafts are ASTM A 461 Grade 660 Material, 65-3/4 inches long and 7-\\ to 8-inches in diameter.
Crystal River, Unit 3, was licensed on January 28, 1977.
On March 21, 1986, Toledo Edison Company reported that ultrasonic examination of the RCP shafts at Davis Besse 1, prompted by the experience of Florida Power Corporation at Crystal River, Unit 3, has revealed three of four RCP shafts have cracked.
Davis Besse 1 was licensed on April 22, 1977, and also has a B&W NSSS with Byron-Jackson RCPs similar to those at Crystal River, Unit 3.
We understand that Maine Yankee, a Combustion Engineering (CE) NSSS, has Byron-Jackson RCPs similar to those at Crystal River, Unit 3, and Davis Besse 1.
Maine Yankee was licensed on September 15, 1972.
In view of the experience of Crystal River, Unit 3, and Davis Besse 1, we believe a significantly high probability exists for cracks in your_RCP shafts, cap bolts and pins, which could propagate to failure (the cap bolts' secure the impellers to the shafts and the pins transfer the torque from the shafts to the impellers).
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. Therefore, pursuant to 10 CFR 50.54(f) of the Commission's regulations, you are requested to submit written statements, signed under oath or affirmation, to enable the Commission to determine whether or not your license should be modified.
Specifically, you are requested to submit to the NRC, within 20 days from the date of this letter, your plans and schedules for inspecting the RCP shafts and other structural components of your RCPs.
In addition you are requested to provide the following information regarding your justification for continued operation until you inspect your RCP shafts and other structural components of your RCPs:
1.
A description of the design and operational history of the Maine Yankee RCPs, which are different from the design and/or operation of the Crystal River, Unit 3, and Davis Besse 1 RCPs.
2.
The results of any analysis performed subsequent to those done for the FSAR which would address the consequences of a locked rotor or broken shaft event during plant operation.
3.
Considering the higher probability than previously envisioned of a postulated RCP shaft failure, describe any actions you have implemented or have planned such as operator review and associated training concerning the specific events at Crystal River, Unit 3, and Davis Besse 1 and monitoring plant parameters such as primary to secondary reactor coolant leakage.
The reporting and/or recordkeeping requirements of this letter affect fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely,
'TRENAI. $CFB) BY'"
DarrellLG.' EisenhutL Acting Director Office of Nuclear Reactor Regulation cc:
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Maine Yankee Atomic Power Company Maine Yankee Atomic Power Station l
cc:
Charles E. Monty, President Mr. P. L. Anderson, Project Manager Maine Yankee Atomic Power Company Yankee Atomic Electric Company 83 Edison Drive 1671 Worchester Road Augusta, Maine 04336 Framingham, Massachusetts 07101 l
Mr. Charles B. Brinkman Mr. G. D. Whittier Manager - Washington Nuclear Licensing Section Head 4
j Operations Maine Yankee Atomic Power Company l
Combustion Engineering, Inc.
83 Edison Drive 7910 Woodmont Avenue Augusta, Maine 04336 Bethesda, Maryland 20814
'i John A. Ritsher, Esquire Ropes & Gray 225 Franklin Street Boston, Massachusetts 02110 i
State Planning Officer Executive Department 189 State Street
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Augusta, Maine 04330 i
Mr. John H. Garrity, Plant Manager Maine Yankee Atomic Power Company l
P. O. Box 408 j
Wiscasset, Maine 04578 1
i Regional Administrator, Region I
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U.S. Nuclear Regulatory Commission 631 Park Avenue
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King of Prussia, Pennsylvania 19406 l
i First Selectman of Wiscasset Municipal Building U.S. Route 1 Wiscasset, Maine 04578 Mr. Cornelius F. Holden l
Resident Inspector
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c/o U.S. Nuclear Regulatory Commission 4
P. O. Box E i
Wiscasset, Maine 04578 t
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