ML17054B973

Discusses Review of Proposed Piping Insp Program Submitted on 840629 in Response to Generic Ltr 84-11, Insp of Stainless Steel Piping. Nonconforming Piping Lines Should Be Included in Augmented Insp Program

ML17054B973
Person / Time
Site:	Nine Mile Point
Issue date:	10/29/1985
From:	Vassallo D Office of Nuclear Reactor Regulation
To:	Mangan C, Seibert C NIAGARA MOHAWK POWER CORP.
References
GL-84-11, IEB-83-02, NUDOCS 8511040194
Download: ML17054B973 (6)

Text

October 29, 1985 Docket No. 50-220 Niagara Mohawk Power Corporation Attn:

Mr. C.

V. Mangan Senior Vice President c/o Miss Catherine R. Seibert 300 Erie Boulevard West

Syracuse, New York 13202

SUBJECT:

NMPC RESPONSE TO GENERJC LETTER 84-11, JNSPECTJON OF STAJNLESS STEEL PJPJNG D J.STR J BUTJON~

ORBII2 Reading NRC PDR Local PDR HThompson SNorris RHermann ELJordan BGrimes JPartlow OELD/Gray File ACRS (10)

Re:

Nine Mile Point Nuclear Station, Unit No.

1 The staff has completed its review of your submittal of June 29, 1984 that was provided in response to Generic Letter 84-11.

Our comments to your proposed piping inspection program are as follows:

(a)

Scope of piping inspection You indicated that the inspections will be performed in accordance with the NMP 1 Technical Specifications (TS).

We noted that the augmented inservice inspection as delineated in the TS applied only to certain systems containing service sensitive components.

We like to point out

that, as a result of the issuance of Generic Letter 84-11, the category of nonconforming nonservice sensitive piping no longer exists, because all nonconforming piping are considered by NRC to be service sensitive.

Therefore, if there are any nonconforming piping lines, previously classified as nonservice sensitive, those lines should be included in the augmented inspection program of the TS.

(b)

Ultrasonic Testing Personnel The recently reported ultrasonic inspection results by the utilities have shown that the performance by UT personnel qualified under JE Bulletin 83-02 lacks uniformity and consistency.

To resolve this

concern, the NRC has determined that UT personnel performing detection and evaluation should be qualified to an upgraded program at EPRJ NDE Center.

We suggest that you contact the EPRJ ND'E Center to arrange for a requalification of the UT personnel to be used for the JGSCC piping inspection at the Spring 1986 refueling outage.

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(c)

Allowable Flaw Sizes for Flux Welds All shielded metal arc welds and submerged arc welds are classified as flux welds.

Laboratory test data have shown that flux welds exhibit lower toughness in comparison with the welds fabricated by other conventional techniques.

Therefore, the allowable flaw sizes for'uch welds in Code JWB-3640 are currently revised to take account of the low toughness.

The revised Code JWB-3640 is expected to be published soon.

Prior to the publication of the revised JWB-3640, the staff has developed interim guidelines in the use of JWB-3640 to derive the allowable flaw sizes for the flux welds.

The key points of the staff interim guidelines are summarized below:

(i)

The secondary stresses (mainly thermal stresses) should be included in the calculation of the stress ratio.

(ii) The flaw size limits for the flux welds are 2/3 of the Code JMB-3640 allowables at a stress ratio as modified by (i).

Please inform us on the results of your augmented inspection program and the disposition of any flaws that may be identified.

Sincerely, Original signed by/

Domenic B. Vassallo, Chief Operating Reactors Branch P2 Division of Licensing CC:

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Mr. C. V. Mangan Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station, Unit No.

1 cc:

Troy B. Conner, Jr.,

Esquire Conner

& Wetterhahn Suite 1050 1747 Pennsylvania

Avenue, N.

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Washington, D.

C.

20006 Frank R. Church, Supervisor Town of Scriba R.

D.

82

Oswego, New York 13126 Niagara Mohawk Power Corporat'ion ATTN:

Mr. Thomas Perkins Plant Superintendent Nine Mile Point Nuclear Station Post Office Box 32

Lycoming, New York 13093 Resident Inspector U. S. Nuclear Regulatory Commission Post Office Box 126

Lycoming, New York 13093 John W. Keib, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West

Syracuse, New York 13202 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Yir. Jay Dunkleberger Division of Policy Analysis and Planning New York State Energy Office Agency Building 2 Empire State Plaza

Albany, New York 12223

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