ML19347A816

Requests Addl Info Re Reactor Pressure Vessel Support Mods

ML19347A816
Person / Time
Site:	Midland
Issue date:	09/19/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8009300309
Download: ML19347A816 (3)

Text

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UNITED STATES g

NUCLEAR REGULATORY COMMISSION 7.

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8 WASHINGTON, D. C. 20555

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SEP 191380 Docket Nos.: 50-329/330 Mr. J. W. Cook Vice President Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON REACTOR VESSEL SUPPORT DESIGN - MIDLAND, UNITS 1 AND 2 Your letter of July 24, 1980 forwarded a report entitled " Reactor Pressure

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Vessel Support Modification for Midland Reactor Power Plant, Midland, Michigan, Preliminary Report No. 1".

This report describes proposed modification includ-ing the design allowable stresses for the reactor vessel anchor bolts and other design criteria and notes that final design loads and detailed analytical techniques will be submitted for our review in October 1980.

Our review of this preliminary report indicates the need for the following additional information:

121.0

_ MATERIALS ENGINEERING BRANCH - MATERIALS INTEGRITY SECTION 121.33 Provide the following information regarding your report " Reactor (5.3,3.9.3)

Pressure Vessel. Support Modification for Midland Nuclear Power Plant, Midland, Michigan, Preliminary Report No.1", July 1980.

1.

Describe the steel making practice used for the material of the three failed reactor vessel anchor bolts. State whether the material was aluminum or silicon killed and vanadium grain refined.

2.

Identify the material of construction, including fabrica-tion details, to be used for the modifications to the reactor vessel support design.

3.

Describe the preservice and inservice inspection program i

to be conducted for the reactor vessel support design, including anchor bolts, shear pins and proposed lateral support desfgn.

Identify all exemptions, if any, which will be needed for the support design.

Discuss any pro-visions included to maintain radiological c::posures during these inspections to as low as is reasonable achievable.

and provida the predicted radiological exposure results t

l for these inspections.

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't Mr. J. W. Cook SEP 191980 We would appreciate your respos ses to these requests at your earliest opportunity and )o a schedule consistent with your requested review and con-currence date of December 1980. Should you require clarification to these requests, please contact us.

Sincerely, M1 Ro r L. Ted co Assistant Director for Licensing Division of Licensing cc: See next page e

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cc: Michael I. Miller, Esq.

Mr. Don van Farowe, Chief Isham, Lincoln & Beale Division of Radiological Health Suite 4200 1 First National Plaza Department of Public Health P. O. Box 33035 Chicago, Illinois 60603 Lansing Michigan 48909 Judd L. Bacon, Esq.

William J. Scanlon, Esq.

Managing Attorney 2034 Pauline Boulevard Consumers Power Company Ann Arbor, Michigan 48103 212 West Michigan Avenue Jackson, Michigan 49201 U. S. Nuclear Regulatory Cocmission Resident Inspectors Office Mr. Paul A. Perry, Secretary Route 7 Consumers Power Company Midland, Michigan 48640 212 West Michigan Avenue Jackson, Michigan 49201 Ms. Barbara Stamiris 5795 N. River Myron M. Cherry, Esq.

Freeland, Michigan 48623 1 IBM Plaza Chicago, Illinois 60611 Ms. Sharon K. Warren 636 Hillcrest Ms. Mary Sinclair

-5711 Summerset Drive Midland, Michigan 48640 Midland, Michigan 48640 Frank J. Kelley, Esq.

, Attorney General State of Michigan Environmental Protection Division

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720 Law Building i

i Lansing, Michigan 48913 t

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r Mr. Wendell Marshall r,

Route 10 l

t Midland, Michigan 48640 Mr. Steve Gadler 2120 Carter Avenue St. Paul, Mianesota 55108

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