ML20211L922

Confirms That Licensee Will Retain Weld 32-WD-050 as IGSCC Category F Until Completion of Reinspection Program,In Response to NRC

ML20211L922
Person / Time
Site:	Nine Mile Point
Issue date:	09/01/1999
From:	Abbott R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NMP1L-1462, NUDOCS 9909090003
Download: ML20211L922 (2)

Text

'

NiagarahMohawk' Richard B. Abbott

' Phone: 315.349.1812 Vice President Fax: 315.349.4417 NuclearEngineering September 1, 1999 NMPIL 1462 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63

Subject:

Analytical Evaluation of Weld 32-WD-050 Indication Gentlemen:

By letter dated June 1,1999, Niagara Mohawk Power Corporation (NMPC) reported the results of reinspecting recirculation line weld 32-WD-050 of Nine Mile Point Unit 1 (NMP1).

These reinspections were performed during refueling outage number 15 (RFO15), which occurred earlier this year. NMPC's letter concluded that the indication previously found on weld 32-WD-050 was an original construction defect and not a flaw associated with intergranular stress corrosion cracking (IGSCC). The letter stated that weld 32-WD-050  ;

would be reclassified from IGSCC Category "F" back to IGSCC Category "A". The letter '

further stated that ASME Code Section XI required inspections would be conducted in the next three inspection periods, which would be adequate to confirm the absence ofIGSCC.

In a letter dated July 23,1999, the NRC indicated that while the weld reinspection program scheduled for the next three inspection periods was acceptable, NMPC's decision to reclassify weld 32-WD-050 from IGSCC Category "F" to IGSCC Category "A" was premature. The letter requested that NMPC inform the NRC of our decision to retain the weld's Category "F" classification pending a satisfactory outcome of the reinspection program.

This letter is to co7 firm that NMPC will retain weld 32-WD-050 as IGSCC Category "F" until the completion of the reinspection program. As this is an administrative decision, it does not affect the reinspection program itself. After the completion of the program and based on its results, NMPC will consider reclassifyi..g the weld from IGSCC Category "F" to IGSCC Category "A".

Very truly yours, s 4

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9909090003 990901 PDR ADOCK 05000220-

//k P ,PDR Richard B. Abbott Vice President Nuclear Engineering RBA/IAA/jb Nine Mile Point Nuclear Station P0. Box 63, Lycoming, New York 13093-0063

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xc: Mr. H. J. Miller, NRC Regional Administrator Mr. S. S. Bajwa, Section Chief PD-I, Section 1, NRR Mr. G. K. Hunegs, NRC Senior Resident Inspector Mr. D. S. Hood, Senior Project Manager, NRR Records Management i

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