ML17328A701
| ML17328A701 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 05/09/1990 |
| From: | Giitter J Office of Nuclear Reactor Regulation |
| To: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| References | |
| IEB-88-002, IEB-88-2, TAC-67301, NUDOCS 9005160199 | |
| Download: ML17328A701 (7) | |
Text
May 9, 1990 Docket No. 50-315-Mr. Milton P. Alexich, Vice President Indiana Michigan Power Company c/o American Electric Power Service Corporation 1 Riverside Plaza
- Columbus, Ohio 43216
Dear Mr. Alexich:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) - DONALD C.
COOK NUCLEAR POWER PLANT UNIT 1 -
RESPONSE
TO NRC BULLETIN 88-02 (TAC NO. 67301)
The staff has reviewed your letter of January 27, 1990, which presented an updated response to NRC Bulletin 88-02, "Rapidly Propagating Fatigue Cracks in Steam Generator Tubes."
On the basis of this review, we have prepared the enclosed request for additional information (RAI).
The staff requests a
response to this RAI in order to complete our review.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance under PL 96-511 is not required.
Sincerely,
Enclosure:
As stated cc:
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Docket No. 50-315, UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D. C. 20555 Hay 9, 1990 Mr. Hilton P. Alexich, Vice President Indiana Hichigan Power Company clo American Electric Power Service Corporation 1 Riverside Plaza
- Columbus, Ohio 43216
Dear Hr. Alexich:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) " DONALD C.
COOK NUCLEAR POWER PLANT UNIT 1 -
RESPONSE
TO NRC BULLETIN 88-02 (TAC NO.
67301)
The staff has reviewed your letter of January 27, 1990, which presented an updated response to NRC Bulletin 88-02, "Rapidly Propagating Fatigue Cracks in Steam Generator Tubes."
On the basis of this review, we have prepared the enclosed request for additional information (RAI}.
The staff requests a
response to this RAI in order to complete our review.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance under PL 96-511 is not required.
Sincere
Enclosure:
As stated Joseph G. Giitter, Project Manager Project Directorate III-1 Division of Reactor Projects - III, IV, V 8 Special Projects Office of Nuclear Reactor Regulation cc:
See next page
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Hr. Milton A1 ex ich Indiana Michigan Power Company Donald C.
Cook Nuclear Plant CC:
Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen El lyn, I 1 linois 60137 Attorney General Department of Attorney General 525 West Ottawa Street Lansing, Michigan 48913 Township Supervisor Lake Township Hall Post Office Box 818 Bridgman, Michigan 49106 Al Blind, Plant Manager Donald C. Cook Nuclear Plant Post Office Box 458 Bridgman, Michigan 49106 U.S. Nuclear Regulatory Commission Resident Inspectors Office 7700 Red Arrow Highway Steversville, Michigan 49127 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.H.
Washington, DC 20037 Mayor, City of Bridgman Post Office Box 366 Bridgman, Michigan 49106 Special Assistant to the Governor Room 1 - State Capitol Lansing, Michigan 48909 Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health Department of Public Health 3500 N. Logan Street Post Office Box 30035 Lansing, Michigan 48909 Mr. S. Brewer American Electric Power Service Corporation 1 Riverside Plaza
- Columbus, Ohio 43216
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION INDIANA MICHIGAN POMER COMPANY COOK UNIT I LICENSEE
RESPONSE
TO BULLETIN 88-02 By letter dated January 27, 1990, Indiana Michigan Power Company provided an updated response to NRC Bulletin 88-02, "Rapidly Propagating Fatigue Cracks ir.
Steam Generator Tubes".
The licensee stated in this letter that a detailed evaluation of field eddy current data has led them to conclude that there is no indication of service-induced denting at the upper support plates of the Cook Unit I steam generators.
(Bulletin 88-02 stated that "denting". should be considered to include evidence of upper support plate corrosion and the presence of magnetite in the tube-to-support plate crevices, regardless of whether there is detectable distortion of the tubes.)
Accordingly, the licensee concludes that actions requested under item C of the bulletin are not app 1 icab le to Coo k Unit l.
The staff has reviewed the subject submittal and requests the following additional information so that it may complete its review of the bulletin issue for Cook Unit l.
1.
Describe the data analysis guidelines and criteria for the detection of support plate corrosion and the presence of magnetite in "the support plate crevices.
2.
Describe the bases for these guidelines and criteria, including a description of mockups and calibration standards employed.
3.
Describe how the data analysts comprehension of the data analysis guidelines and criteria was assured.
4.
Pages I and 2 of the attachment to the licensee's January 29, 1990 letter refers to "45 dents" or "signal anomalies previously reported as dents" which were subsequently "determined to be insignificant".
Please provide a copy of the field eddy current data for a.representative sample of these signal anomalies.
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