ML17249A385
| ML17249A385 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/26/1979 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-04.B, TASK-3-4.B, TASK-RR NUDOCS 8001020291 | |
| Download: ML17249A385 (5) | |
Text
REGULATOh INFORMATION DISTRIBOTION 4
'TEM (RIDS)
ACCESSION NBR:8001020291 DOC ~ DATE: 79/12/26 NOTARIZED; NO PACIC.:50 244 Robert
.-Emmet Ginna Nuclear Pi ant i Un> t ii Rochester G
AOTHiNAME AUTHOR AFFIlIATION WHKTEgL,D>>
Rochester Gas L Electric Corp, AEC lP ~ NAME RECIPIENT 'AFFILIATION Z IEMAANiD. L ~
Operrating Reactors Branch 2
DOCKET 05000244
SUBJECT:
Responds to NRC, 791214 request re actions taken by util since 791030 meeting concet ning clisclosut e of potential of turbine disk cracking. Operation of turbine L schedule of rotor insp program schedule are acceptable, DISTRIBUTION CODE>>
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05 BC P.S e g INTERNAL:
0 12 ILE i5 CORE. PERF BR i8 REAL SFY BR 20 EEB"'2 BRINKMAN OELD EXTERNAL: 03 LPDR 23 ACRS 1
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1 16 02 NRC PDR 14
'fA/EDO i7 ENGR BR 19 PLANT SYS BR 2i EFLT TAT SYS EPB DOR 04 NSIC 1ii 1
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///SIIIIi EIIIASP iles(siiE(l zuzirz ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE. JR.
VICE PRESIDENT TCLCPHONC ARCA CODE 7IS 546-2700 December 26, 1979 Director of Nuclear Reactor Regulation ATTENTION:
Mr. Dennis L. Ziemann, Chief Operating Reactor Branch No.
2 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
SUBJECT:
Turbine Disk Cracking
Dear Mr. Ziemann:
In response to the NRC request of December 14, 1979 regarding actions taken by RG&E since the October 30, 1979 meeting in Charlotte regarding disclosure of the potential for turbine disk cracking, the following determinations have been made:
1.
Long before the October 30 meeting, RG&E had entered into an interchangeability
As a
result of this program, a spare rotor, LP-C, was manufactured and delivered in 1978.
This rotor was placed in service May 21, 1978 in the LP-2 turbine.
The calendar months of service is now 19.
This new rotor underwent a thorough "wet mag particle" inspection (including the entire bore and keyway area) and a
UT inspection of the forgings during the manufacturing
- process, prior to installation.
Based on operating experience, and consistent with recent inspection findings, it is unlikely that any crack indications should appear in the new rotor in this short time period.
2.
The rotor now in the LP-1 turbine is the LP-B rotor which was originally installed in the LP-2 turbine.
This LP-B rotor had been sent in 1978 to the Westinghouse turbine factory in Charlotte to have three new rows of blades installed, and other modifications made.
It was then installed in the LP-1 turbine in April 1979.
During the refurbishing, a
magnetic particle inspection was done on the rotor.
- Also, RG&E S 001 OSO ~~
J
ROCHESTER GAS AND ELECTRIC CORP.
DATE December 26, 1979 Hr. Dennis L. Ziemann SHEET NO.
2 has contracted with Westinghouse to perform a comprehensive UT inspection of this rotor dur'ing the Spring 1980 refueling shutdown.
3.
The LP-A rotor taken from LP-1 in 1979 has been refurbished in the Westinghouse turbine factory in Charlotte and is awaiting installation of a coupling.
After the October
- meeting, the keyway side of'he disks were inspected and found to be free of any crack indications.
This inspection technique was qualified by a technician from RG8 E.
The upstream side of these disks will be inspected as soon as technicians become available shortly after January 1.
The fact that this nine year old rotor was found to be free of crack indications provides strong evidence that the other rotors are similarly defect-free.
The completion of the UT inspection of LP-A in January should confirm this.
These above-stated reasons allow RGIIE to conclude that operation of the turbine as presently in service, and the schedule of the rotor inspection
- program, are acceptable.
Very truly yours, Leon D. White, Jr.
Vice President LDW:mep
r' II