ML17318A813
| ML17318A813 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 04/29/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Dolan J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| References | |
| NUDOCS 8006170748 | |
| Download: ML17318A813 (12) | |
Text
APRIL 2 9 gg0
+7)8IE Docket No. 50-315 Hr. John Dolan, Vice President Indiana and Michigan Electric Company Post Office Box 18 Bowling Green Station New York, New York 10004
Dear Hr. Dolan:
On December 28, 1979 the NRC Office of Inspection and Enforcement issued Information Notice No. 79.37 that discussed the discovery of'racks in the key way and bore sections of discs in tlestinghouse low-pressure turbines.
A copy of this Information Notice with an errata sheet is enclosed.
Subse.-
quently, all license/users of low-pressure turbines manufactured by General Electric were invited to meet with the NRC staff and representatives of the vendor on January 9, 1980 to discuss the probability of disc cracking in these turbines.
A summary of this meeting and the General Electric Company's presentation are also enclosed with this letter.
At the time of tfle January 9 meeting General Electric did not have any recent results of ultrasonic inspections of its low-pressure turbines.
Since that date full UT inspections have been performed on six rotors at five nuclear power plants.
Some indications in the keyway region have been reported in discs at three of these plants.
General Electric personnel believe that these indications were caused by water erosion rather than by stless corrosion+
The staff desires to learn more about the underlying reasons for the indica-tions found and the probable rate of growth of these, indications and their effects on turbine disc integrity.
For this purpose we request that you provide the information sought in Enclosure 3 to this letter and address its safety significance.
Under the provisions of 10 CFR 50.54 (f) your response is requested within 30 days of the receipt of this letter.
A copy of this letter is being telecopied to you, along with Enclosure 3.
oooo'o~gg OFFICE) g.. i..
SURNAME OATE$
NRC FORM 318 {9 76) NRCM 0240
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O'V.S. GOVERNMENT PRINTING OFFICE 1579
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~F 2FF It is ap understanding that additional UT inspections are to be performed by General Electric. in the near future.
We encourage this at'.tion as being the only certain means of determining the integrity oj turbine discs.
We also reconmnd that.if you have not already done so, that you develop a
schedule for performing a full UT inspection of at 'feast one of your low pressure turbines forduring the next major outage of your D. C. Cook Unit 1 Nuclear Plant.
This request for generic information was approved by GAO under clearance number B-180226 (S79014); this clearance expires June 30, 1980.
Sincere'ly, Original Signed Bg A.,Schxvencer
Enclosures:
1.
Information Bulletin No. 79.37 2.
tteeting Summary 3-Information Requests cc:
See next page A. Schwencer, Chief Operating Reactors Branch ¹1 Division of Operating Reactors DISTRIBUTION:- 31 I NRC PDR Local PDR NRR Reading ORB¹1 Reading WRoss ASchwencer DWigginton RReid TIppol ito DZiemann WGammi 11 VNoonan DEisenhut BGrimes
- Attorney, OELD
~ OI8E (3)
- See revious concurrences "AD ORP
- DOR:EB
- D:DOR WGammill VNoonan DEisenhut 03/ 17
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John Dolan
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It fs re=-understanding that additional UT inspections are to be performed by General Electric fn the near future.
l<e encourage this action as being the only
. certain means of determinfng the integrity of turbine discs.
He also recormend that if you have not already done so, that you develop a schedule for performing a full UT inspection of at least one of your le( pressure turbines during the next major outage of your D. C. Cook Unit 1 Nuclear Plant.
This request for generic information was approved by GAO under clearance number B-180225 (S79014); this clearance expires June 30, 1980.
Sincerely,
Enclosures:
l.
Information Bulletin No. 79.37 2.
YIeetf ng Summary 3.
Information Requests cc:
See next page A. Schwencer, Chief Operating Reactors Branch 5 Division of Operating Reactors DISTRIBUTION:
Docket No. 50-315 NRC DPR Local PDR NRR Reading ORB¹1 Reading WRoss ASchwencer RReid TIppolito DZiemann WGammil1 VNoonan DEisenhut BGrimes
- Attorney, OELD OI&E (3)
DWigginton
- DOR:ORB¹l
- DOR:EB DWigginton V
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- See previous concurrences 03 80 g~I80
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2 It is op understanding that additional UT inspections are to be performed by General Electric in the near future.
We encourage this action as being the only certain means of keteVmititggthe integrity of turbine discs.
We also recommend that if you have not already done so, that you develop a schedule for performing a full UT inspection of at least one of your low pressure turbines during the next ma)or outage of your D. C. Cook Unit 1 Nuclear Plant.
Sincerely,
Enclosures:
l.
Information Bulletin No. 79.37 2.
Heetfng Summary 3.
Informati on Requests A. Schwencer.
Chief Operating Reactors Branch ¹1 Division of-Operating Reactors DISTRIBUTION:
~k.
-31 5 NRC DPR Local PDR NRR Reading ORB¹l Reading Ross Schwencer Reid Ippolito Ziemann Gammi 1 1 Noonan Eisenhut Grimes
- Attorney, OELD OISE (3)
DOR:ORB¹1 D. Wigginton 03 80 DOR:EB Noonan 03/
D:DOR Eisenhut 80 03/
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WRos OATE$ 03/ J
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++*++
UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20666 April 29, 1980 Docket No. 50-315 Mr. John Dolan, Vice President Indiana and Michigan Electric Company Post Office Box 18 Bowling Green Station New York, New. York 10004
Dear Mr. Dolan:
On December 28, 1979 the NRC Office of Inspection and Enforcement issued Information Notice No. 79.37 that discussed the discovery of cracks in the key way and bore sections of discs in Westinghouse low-pressure turbines.
A copy of this Information Notice with an errata sheet is enclosed.
Subse-quently, all license/users of low-pressure turbines manufactured by General Electric were invited to meet with the NRC staff and representatives of the vendor on January 9, 1980 to discuss the probability of disc cracking in these turbines.
A summary of this meeting and the General Electric Coo@any's presentation are also enclosed with this letter.
At the time of the January 9 meeting General Electric did not have any recent results of ultrasonic inspections of its low-pressure turbines.
Since that date full UT inspections have been performed on six rotors at five nuclear power plants.
Some indications in the keyway region have been reported in discs at three of these plants.
General Electric personnel believe that these indications were caused by water erosion rather than by stress corrosion.
The staff desires to learn more about the underlying reasons for the indica-tions found and the probable rate of growth of these, indications and their effects on turbine disc integrity.
for this purpose we request that you provide the information sought in Enclosure 3 to this letter and address its safety significance.
Under the provisions of 10 CFR 50.54 (f) your response is requested within 30 days of the receipt of this letter.
A copy of this letter is being telecopied to you, along with Enclosure 3.
8006t 07/g'
I'
John Dolan M2w April 29, 1980 It is op understanding that additional UT inspections are to be performed by General Electric in the near future.
We encourage this action as being the only certain means of determining the integrity of turbine discs.
We also recomend that if you have not already done so, that you develop a
schedule for performing a full UT inspection of at least one of your low pressure turbines forduring the next major outage of your D. C.
Cook Unit 1 Nuclear Plant.
This request for generic information was approved by GAO under clearance number B-180225 (S79014); this clearance expires June 30, 1980.
Sincerely,
Enclosures:
1.
Information Bulletin No. 79.37 2.
Meeting Summary 3.
Information Requests cc:
See next page A. Schwencer, Chief Operating Reactors Branch 81 Division of Operating Reactors
Mr. John Dolan Indiana and Michigan Electric Company 2 -
April 29, 1980 cc:
Mr. Robert W; Jurgensen Chief Nuclear Engineer American Electric Power Service Corporation
. 2 Broadway New York, New York 10004.
Gerald Charnoff, Esquire
- Shaw, Pfttman, Potts and Trowbridge 1800 M Street, N.W.
Washington, D. C.
20036 Citizens for a Better Environment 59 East Van Buren Street Chicago, Illinois 60605 Maude Preston Palenske Memorial Library 500 Market Street St. Joseph, Michigan 49085 Mr. D. Shaller, Plant Manager Donald C.
Cook Nuclear Plant P. 0.
Box 458
- Bridgman, Michigan 49106 Mr. Robert Masse Resident Inspector Donald C.
Cook Nuclear Plant U. S. Nuclear Regulatory Commission P. 0.
Box 458