ML20204B706

Requests Approval of Proposed Operability Criteria for Use in Evaluation & Interim Resolution of Degraded & Nonconforming Conditions with Piping & Pipe Supports at Facility

ML20204B706
Person / Time
Site:	Cooper
Issue date:	03/11/1999
From:	Lawrence Burkhart NRC (Affiliation Not Assigned)
To:	Horn G NEBRASKA PUBLIC POWER DISTRICT
References
TAC-MA0146, TAC-MA146, NUDOCS 9903220215
Download: ML20204B706 (2)

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a UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 3066H001

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March 11, 1999 Mr. G. R. Horn Sr. Vice President of Energy Supply Nebraska Public Power District 141415th Street Columbus, NE 68601

SUBJECT:

NEBRASKA PUBLIC POWER DISTRICT REQUEST FOR APPROVAL OF PIPING AND SUPPORT OPERABILITY CRITERIA FOR THE COOPER NUCLEAR STATION (TAC NO. MA0416)

Dear Mr. Horn:

l By letter dated September 5,1997, the Nebraska Pub!!c Power District (NPPD, the licensee) requested staff approval of its proposed operability criteria for use in evaluation and interim resolution of degraded and nonconforming conditions with piping and pipe supports at the Cooper Nuclear Station. The request was made pursuant to Title 10 of the Code of Federal Reaulations (10 CFR), Section bO.55a(a)(3)(i), which allows the use of alternais criteria where it has been demonstrated that the proposed alternate provides an acceptable level of quality and safety. NPPD's proposed criteria does not c6nstitute an attemative pursuant to 10 CFR j

50.55a(a)(3)(i) because it is only intended for use as interim operability criteria.

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However, the staff noted that NPPD's proposed operability criteria for piping and supports are similar to criteria previously approved by the staff for Dresden and Quad Cities. The staff's f

evaluation of the DresderVOuad Cities operability criteria is contained in its September 27, o

i 1991, letter to Commonwesith Edison Company. The staff considers the operability stress

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criteria for pipir.g end supports previously approved for Dresden and Quad Cities acceptable for use as operability criteria for the Cooper Nuclear Station.

06(f)h The oper;bility criteria approved for Dresden and Quad Cities also specified the use of Regulatory Guide (RG) 1.61," Damping Values for Seismic Dcsign of Nuclear Power Plants,"

damping for the piping analysis. As indicated in the staff's September 27,1991, evaluation, Commonwealth Edison justified the use of RG 1.61 damping for operability based on conservatism in its design response spectrum. NPPD also proposed to use RG 1.61 damping for operability evaluation at the Cooper Nuclear Station but did not present a corresponding technical argument in its submittal. Consequently, on the base of the it, formation sut'mitted by the licensee, the staff does not accept the use of RG 1.61 damping for piping operability evaluations at the Cooper Nuclear Station.

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G. R. Horn #

These issues were discussed with your staff on February 9,1999, and it was agreed that the work associated with this issue (TAC No. MA0416) would be closed. The issue of the use of RG 1.61 damping for piping analysis may be revisited in the future contingent upon NPPD's su' nittal of appropriate technical documentation.

Sincerely, 6%l }%

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Lawrence. Burkhart, Project Manager Project Cnactorate IV-1 Division of Licensing Project Management Office of Nuclear Reactor Regulation I

Docket No. 50-298 cc: See next page i

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G. R. Horn )

These issues were discussed with your staff on February 9,1999, and it was agreed that the 1,

work associated with this issue (TAC No. MA0416) would be clased. The issue of the use of.

l RG 1.61 damping for piping analysis may be revisited in the future contingent upon NPPD's submittal of appropriate technical documentation.

l Sincerely,-.

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Lawrence J. Burk. rt, Project Manager i

Project Directorate IV-1 Division of Licensing Project Managemsnt l

Office of Nuclear Reactor Regulation l

Docket No. 50-298 i

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cc: See next page

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• Mr. G. R. Horn Nebraska Public Power District Coope Nuclear Station cc:

Mr. John A McPhail, General Counsel Lincoln Electric System

-- - Nebraska Public Power District ATTN: Mr. Ron Stoddard P. O. Box'499 1040 O Street Columbus, NE 68602-0499 Box 80869 Lincoln, NE 68501 Nebraska Public Power District ATiN: Mr.J. H. Swailes MidAmerican Energy Vice President of Nuclear Energy ATTN: Dr. William D. Leech, Manager-Nuclear P. O. Box 98 907 Walnut Street Brownville, NE 68321 P. O. Box 657 -

Des Moines, IA 50303-0657 Randolph Wood, Director Nebraska Department of Environmental Nebraska Public Power District Control ATTN: Mr. B. L. Houston, Nuclear

. P. O. Box 98922 Licensing & Safety Manager Lincoln, NE 68509-8922 P. O. Box 98 Brownville, NE 68321 Mr. Larry Bohlken, Chaininan Nemaha County Board of Commissioners Nemaha County Courthouse 1824 N Street Aubum, NE 68305 Sen!or Resident inspector U.S. Nuclear Regt.latory Commission P. O. Box 218 Brownville, NE 68321 Reg!onal Administrator, Region IV U.S. Nuclew Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Adington,TX 76011 Ms. Cheryl Rogers, LLRW Program Manager Division of Radiological Health Nebraska Department of Health' 301 Centennial Mall, South P. O. Box 95007 Lincoln, NE 68509-5007 Mr. Ronald A. Kucera, Department Director of Intergovemmental Cooperation Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102

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