ML20138F572

Forwards Response to 970317 RAI Re Request for Relief No 8 for Third 10-yr Interval Inservice Insp Program

ML20138F572
Person / Time
Site:	Monticello
Issue date:	04/29/1997
From:	Hill W NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M96255, NUDOCS 9705060005
Download: ML20138F572 (3)

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'l Northom States Power Company Apnl 29,1997 10 CFR Pad 50 Section 50.55a US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Response to Request for Additional Information Dated March 17,1997 Regarding Request for Relief No. 8 for the 3rd 10-Year interval Inservice insoection Proaram (TAC NO. M96255)

On July 29,1993, Monticello submitted Revision No.1 of our third 10-year Inservics Inspection Examination Plan. By letter dated March 14,1996, with subject " Request for Relief for the 3rd 10-Year Interval Inservice Inspection Program" Monticello submitted Relief Request No. 8 which addressed documentation requirements for calibration blocks. On March 13,1997, Monticello submitted Revision No.2 of our third 10-year Inservice inspection Examination Plan.

By letter dated March 17,1997, the NRC staff requested additional information in order to complete review of the Request for Relief. Attachment A to this letter provides the information requested by the staff.

This letter contains the following new NRC commitment: I I

When using the existing calibration blocks that lack the appropdate documentation a l companson will be made between the acoustical properties (i.e., velocity and attenuation) of l the calibration block and the matenal being examined. This companson will be done once, pnor to the use of the calibration block, to ensure that the sensitivityis sufficient to find 1 existing flaws in corresponding examination volumes.

Please contact Sam Shirey, Sr. Licensing Engineer, at (612) 295-1449 if you require further information.

hYhth l l

William J Hill Plant Manager 050.112 i Monticello Nuclear Generating Plant i c: Regional Administrator- 111, NRC hh(

NRR Project Manager, NRC Sr Resident inspector, NRC Michael T. Anderson, INEL Research Center 9705060005 970429 Ill.1.1, I.l,i I.Illl.lil. I!ll. l.l' PDR ADOCK 05000263 0 PDR

State of Minnesota Attn: Kris Sanda l J Silberg

Attachment:

A: Monticello Nuclear Generating Plant Response to NRC Request for Additional Information Dated March 17,1997 Regarding Request for Relief No. 8 for the 3rd 10-Year Interval inservice inspection Program.

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1 Attachment A )

Monticello Nuclear Generating Plant )

Response to NRC Request for Additional Information Dated March 17,1997 Regarding ,

ISI Relief Reauest No. 8 Requested Information Should the licensee elect to pursue the subject request for relief, the licensee  !

should submit additionalinformation that incorporates the aforementioned condition.

This information will provide the docketed commitment that is necessary in order to authorize the licensee's alternative.

The " aforementioned condition" is ,

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. .. continued use is acceptable provided that the licensee performs a compan' son l between the attenuation and velocity of calibration block material and the material '

being examined."

Monticello Response The following information is to clarify our intent regarding the use of the existing calibration blocks. This information corresponds with Idaho National Engineering Laboratory's report INEL-95/0564 dated November 1995 issued for the corresponding  ;

relief request for NSP's Prairie Island Nuclear Generating Plant.

When using the existing calibration blocks that lack the appropriate documentation a comparison will be made between the acoustical properties (i.e., velocity and attenuation) of the calibration block and the material being examined. This comparison will be done i once, prior to the use of the calibration block, to ensure that the sensitivity is sufficient to i find existing flaws in corresponding examination volumes.

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