ML17279A158

Discusses Review of Util 861120 Submittal of Insp Schedule for Low Pressure Turbines Per License Condition 2.C.(7). License Condition Satisfied

ML17279A158
Person / Time
Site:	Columbia
Issue date:	03/27/1987
From:	Adensam E Office of Nuclear Reactor Regulation
To:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
NUDOCS 8704020448
Download: ML17279A158 (6)

Text

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0-397 NRC PDR Local PDR BWD-3 r/f EAdensam EHylton JBradfute RBernero JPartlow EJordan BGrimes ACRS (10)

Attorney, OGC March 27, 1987 Docket No. 50-397 Mr. G. C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System P.O.

Box 968 3000 George Washington Way Richland, Washington 99352

Subject:

WNP-2: License Condition on Turbine Missiles

References:

1. "Procedures for Estimating the Probability of Steam Turbine Disc Rupture from Stress Corrosion Cracking," Westinghouse Steam Turbine Generator Division, WSTG-1-P, May 1981.

(Proprietary)

2. "Analysis of the Probability of the Generation and Strike of Missiles from a Nuclear Turbine," Westinghouse Steam Turbine Generation Division, March 1974.

3. "Missile Energy Analysis Methods for Nuclear Steam Turbines,"

Westinghouse Steam Turbine Generator Division, WSTG-2-P, May 1981.

(Propr ietary)

4. "Analysis of the Probability of a Nuclear Turbine Reaching Destructive Overspeed,"

Westinghouse Steam Turbine Generator Division, WSTG-3-P, July 1984.

(Proprietary)

By letter dated November 20, 1986, the Washington Public Power Supply System submitted an inspection schedule for the low pressure turbines at WNP-2 to, satisfy License Condition 2.C.(7).

The license condition requires that:

"The licensee shall submit for NRC staff approval, within three years of date of issuance of this license, a turbine system maintenance program based on the manufacturer's calculations of missile generation probabilities acceptable to the NRC staff or volumetrically inspect all low pressure turbine rotors at the second refueling outage, and at every other refueling outage thereafter until a maintenance program is approved by the NRC staff."

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The WNP-2 facility uses Westinghouse low,pressure turbines-LP¹1, LP¹2, and LP¹3.

The initial inspection intervals for the LP turbines were recommended by Westinghouse to be 57.8 months for LP¹1, 55.7 months for LP¹2, and 56.3 months for LP¹3.

These inspection intervals were based on a series of'opical reports I

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(references) approved by NRC as Licensing Topical Reports.'he approval letter from Charles E. Rossi, NRC, to James A. Martin, Westinghouse was dated February 2, 1987.

As stated in the WNP-2 FSAR, Subsection 3.5.1.3.4.3, the licensee is further committed to reduce the inspection intervals for subsequent inspections if cracks are detected and measured at any inspection.

The licensee intends to inspect the LP turbines at intervals shorter than those recommended by the manufacturer, i.e.

36 months for LP¹1, 48 months for LP¹2, and 36 months for LP¹3.

In the November 20, 1986 letter, the licensee stated that the inspection interval is subject to change depending on previous inspection results, the existence or lack of flaws, equipment availability and inspection refinements or techniques yet to be developed.

As stated in the WNP-2 FSAR subsection 3.5.1.3.4.3, the licensee is committed to reduce the inspection intervals for subsequent inspections if cracks are detected and measured, according to the Westinghouse methodology, at any inspection.

Based on the licensee's commitments in the submittal of November 20, 1986, and the WNP-2 FSAR, the staff concludes that License Condition 2.C.(7) has been satisfied.

Sincerely, cc:

See next page

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Elinor G. Adensam, Director BWR Project Directorate No.

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Mr. G.

C. Sorensen, Manager Washington Public Power Supply System WPPSS Nuclear Project No.

2 (WNP-21 CC:

Nicholas S.

Reynolds, Esa.

Bishop, Liberman,

Cook, Purcell K Reynolds 1200 Seventeenth

Street, N.W.

Washington, D.C.

20036 Mr. G.

E. Doupe, Esauire Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way

Richland, Washington 99532 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, Washington 98504 Mr. P. L. Powell, Licensing Manager Washington Public Power Supply System P. 0.

Box 968, MD 9568 Richland, Washington 99352 Resident Inspector U. S. Nuclear Regulatory Commission P. 0.

Box 69

Richland, Washington 99352 R. B. Glasscock, Director Licensing and Assurance Washington Public Power Supply System P.

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Box 968, HD 280 Richland, Washington 99352 Mr. C.

M. Powers WNP-2 Plant Manager Washington Public Power Supply System P. 0.

Box MD 927K Richland, Washington 99352 Regional Administrator, Region V

U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, CalHornia 94596

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