ML20246P572

Forwards Request for Relief 89-06 from Requirement of Section of XI of ASME Boiler & Pressure Code Re Second 10-yr Interval Inservice Insp.W/Three Oversize Drawings

ML20246P572
Person / Time
Site:	Oconee
Issue date:	07/13/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML15239A645	List: ML20246P572
References
NUDOCS 8907200249
Download: ML20246P572 (5)

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. DUKE POWER GOMPANY P.O. box 33189 CHARLOTTE, N.C. 28242 HAL B.TUCKEH retsenowm.

c vies emnarnevre (704) 373-4531 July 13, 1989-U. S. Nuclear. Regulatory. Commission

. Document Control Desk.

~ Washington, DC 20555

Subject:

Oconee Nuclear Station Docket Nos.. 50-269, -270, -287

Second Ten Year Interval Request for Relief No. 89-06 Gentlemen:

Pursuant to 10CFR 50, 50.55a, please find attached request far relief number ~89-06 from the requirements of Section XI of the ASME Boiler and Pressure Vessel' Code (with' Addenda through Winter 1980). This request is being. submitted due to the ' impracticality of pressure testing specif.ic welds as-required by the Code following repair..The attached request concerns the inservice inspection at Oconee Unit 2 being performed during the second ten year interval.

Very truly yours, 6

Hal Tucker PJN/30/td Attachment QW kN}

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JDocument Control Desk July 13,'1989~

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cc: W/0 Diagrams Mr. S. D. Ebneter Regional Administrator-a/J LIE

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U..SP Nuclear Regulatory Commission - Region II 101 Marietta St. NW' L

Suite'2900 -' Atlanta, GA' 30323 Mr. L. A. Wiens Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission iWashington, DC.20.35

.Mr> Heyward.Shealy, Chief-Bureau of Radiological Health S. C. Department of Health and Environmental Control 2600 Bu11 Street Columbus, SC.-29201 Mr.:P.-H.. Skinner NRC Resident Inspector "Oconee Nuclear Station r_____-__________,

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A Duke Power Company Oconee Nuclear Station Second Ten Year Interval.

Request for Relief No. 89-06 1.

Component for which relief is requested:

(a) Name and Number:

Main Steam (MS) System welds for-installing valve 2MS-76 (see attached flow diagrams).

(b). Function:

2MS-76 is the first valve off main steam line B to the second stage reheaters 2A1 and 2A2.

(c)

ISI Class / Duke Class:

Inlet ISI Class B/ Duke Class F Outlet ISI Class NA/ Duke Class G (d). IWV-2200 Valve Category: B II.

Reference Code requirement that has been determined to be impractical:

ASME Boiler and Pressure Vessel Code Section XI, 1980 Edition (with Addenda through Winter 1980) paragraph IWA-4400(a), which states that after repairs by welding on the pressure retaining boundary, a system hydrostatic test shall be performed in accordance with IWA-5000.

III. Basis for requesting relief:

As indicated by blue lines in the attached flow diagrams, hydrostatic testing would require filling the main steam line, the steam generator, and part of the feedwater system with water.

This would unnecessarily require an additional hydrostatic test cycle on the steam generator.

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t IV. Alternate examination:

Welds wi ' be 100% radiographer and a VT-2 inspection will be performed at operating temperature and pressure.

In addition, the welds will be hydrostatically tested during the second ten year interval inservice inspection hydro of the main steam lines.

V.

Evaluation of acceptability of proposed alternate testing with respect to the level of quality and safety as well as public health and safety:

The specified method of hydrostatic testing verifies that there are no leaks at 1.25 times the design pressure. The alternate examination of the 100% radiograph of welds assures that no significant flaws are evident in the welds. The VT-2 inspection indicates that no leaks are detectable when the system is at operating temperature and pressure. The alternate tests provide an equivalent method to indicate a leak at the higher stress level which is normally verified by the specified method of hydrostatic testing.

As such, tne proposed alternate examinations provide a acceptable level of quality and safety and will not endanger the alth and safety of the public.

VI.

Implementation Schedule:

The 100% radiograph will be performed when welding is complete. The VT-2 inspection will be performed during startup from the Unit 2 End of Cycle 10 refueling outage.

Hydrostatic testing will be performed during the second ten year interval inservice inspection hydro of the main steam lines.

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FORM OR 27 REVISION 1

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