ML063120515

Prairie Island, Unit 2 - Telephone Conference to Discuss the Results of the Steam Generator Inspection During Upcoming Refueling Outage

ML063120515
Person / Time
Site:	Prairie Island
Issue date:	11/16/2006
From:	Chawla M L NRC/NRR/ADRO/DORL/LPLIII-1
To:	Palmisano T J Nuclear Management Co
M. Chawla LPL3-1
References
TAC MD3441
Download: ML063120515 (5)

Text

November 16, 2006Mr. Thomas J. PalmisanoSite Vice President Prairie Island Nuclear Generating Plant Nuclear Management Company, LLC 1717 Wakonade Drive East Welch, MN 55089

SUBJECT:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNIT 2 - TELEPHONECONFERENCE TO DISCUSS THE RESULTS OF THE STEAM GENERATOR INSPECTION DURING UPCOMING UNIT 2 REFUELING OUTAGE (TAC NUMBER MD3441)

Dear Mr. Palmisano:

The Nuclear Regulatory Commission (NRC) staff would like to discuss results of the steamgenerator (SG) tube inspections to be conducted during the upcoming Prairie Island Nuclear Generating Plant, Unit 2 refueling outage. Please review the enclosed discussion points, which have been prepared to facilitate the phone conference with your representatives. We would like to schedule this phone call towards the end of the planned SG tube inspection interval, but before the unit completes the inspections and repairs.If you have any questions regarding this response, please contact me.Sincerely,/RA/Mahesh Chawla, Project ManagerPlant Licensing Branch III-1Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-306

Enclosure:

As statedcc: see next page

ML063120515OFFICENRR/LPL3-1/PMNRR/LPL3-1/LABC:AFPBNRR/LPL3-1/BCNAMEMChawla: caTHarrisPaul KleinLRaghavanDATE11/ 9/0611/9/0611/15/0611/16/06 STEAM GENERATOR TUBE INSPECTION DISCUSSION POINTSPREPARED BY THE OFFICE OF NUCLEAR REACTOR REGULATIONNUCLEAR MANAGEMENT COMPANYPRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNIT 2DOCKET NO. 50-306The following discussion points have been prepared to facilitate the phone conference arrangedwith the Nuclear Management Company licensee to discuss the results of the steam generator(SG) tube inspections to be conducted during the upcoming Prairie Island Nuclear GeneratingPlant, Unit 2 refueling outage. This phone call is scheduled to occur towards the end of the planned SG tube inspection interval, but before the unit completes the inspections and repairs.The staff plans to document a brief summary of the conference call as well as any material thatis provided in support of the call.1.Discuss any trends in the amount of primary-to-secondary leakage observed during therecently completed cycle.2.Discuss whether any secondary side pressure tests were performed during the outageand the associated results.3.Discuss any exceptions taken to the industry guidelines.

4.For each SG, provide a description of the inspections performed including the areasexamined and the probes used (e.g., dents/dings, sleeves, expansion-transition, U-bends with a rotating probe), the scope of the inspection (e.g., 100 percent of dents/dings greater than 5 volts and a 20 percent sample between two and five volts),

and the expansion criteria.5.For each area examined (e.g., tube supports, dent/dings, sleeves, etc), provide asummary of the number of indications identified to-date of each degradation mode (e.g.,

number of circumferential primary water stress corrosion cracking indications at the expansion transition). For the most significant indications in each area, provide an estimate of the severity of the indication (e.g., provide the voltage, depth, and length of the indication). In particular, address whether tube integrity (structural and accident induced leakage integrity) was maintained during the previous operating cycle. In addition, discuss whether any location exhibited a degradation mode that had not previously been observed at this location at this unit (e.g., observed circumferential primary water stress corrosion cracking at the expansion transition for the first time at this unit).6.Describe repair/plugging plans.

7.Describe in-situ pressure test and tube pull plans and results (as applicable and ifavailable).8.Provide the schedule for steam generator-related activities during the remainder of thecurrent outage. 9.Discuss the following regarding loose parts:*what inspections are performed to detect loose parts*a description of any loose parts detected and their location within the SG

• if the loose parts were removed from the SG

• indications of tube damage associated with the loose parts

• the source or nature of the loose parts if known10.Discuss the results of any secondary side inspections.

11.Discuss any unexpected or unusual results.

Prairie Island Nuclear Generating Plant,Units 1 and 2 cc:

Jonathan Rogoff, EsquireVice President, Counsel & Secretary Nuclear Management Company, LLC 700 First Street Hudson, WI 54016Manager, Regulatory AffairsPrairie Island Nuclear Generating Plant Nuclear Management Company, LLC 1717 Wakonade Drive East Welch, MN 55089Manager - Environmental Protection DivisionMinnesota Attorney General's Office 445 Minnesota St., Suite 900 St. Paul, MN 55101-2127U.S. Nuclear Regulatory CommissionResident Inspector's Office 1719 Wakonade Drive East Welch, MN 55089-9642Regional Administrator, Region IIIU.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351AdministratorGoodhue County Courthouse Box 408 Red Wing, MN 55066-0408CommissionerMinnesota Department of Commerce 85 7th Place East, Suite 500 St. Paul, MN 55101-2198Tribal CouncilPrairie Island Indian Community ATTN: Environmental Department 5636 Sturgeon Lake Road Welch, MN 55089Nuclear Asset ManagerXcel Energy, Inc.

414 Nicollet Mall, R.S. 8 Minneapolis, MN 55401Michael B. SellmanPresident and Chief Executive Officer Nuclear Management Company, LLC 700 First Street Hudson, MI 54016Craig G. AndersonSenior Vice President, Group Operations Nuclear Management Company, LLC 700 First Street Hudson, WI 54016November 2005