ML20203E375

Forwards Insp 50-282/97-20 on 971026-30 & 1117-19.No Violations Noted

ML20203E375
Person / Time
Site:	Prairie Island
Issue date:	12/05/1997
From:	Grobe J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Wadley M NORTHERN STATES POWER CO.
Shared Package
ML20203E378	List: IR 05000282/1997020 ML20203E375
References
50-282-97-20, NUDOCS 9712170042
Download: ML20203E375 (3)

See also: IR 05000282/1997020

Text

_ _ _ _ _ _

Dcortt;er 5, 1997

Mr. M. D. Wadley

Vice President, Nuclear Generation

Northern States Power Company

414 Nicollet Mall

Minneapolis, MN 55401

SUBJECT: NRC INSPECTION REPORT 50 282/97020(DRS)

Dear Mr. Wadley:

On November,19,1997, the NRC completed an inspection at your Prairie Island, Unit 1,

reactor facility. The enclosed report presents the results of that inspection.

The inspection included a review of the Unit i steam generator tube inservice inspection

activities. The indications identified during steam generator tube ede ,urrent examination

were predominantly axially oriented Indications located in the tube roll transition in the

tubesheet region; indicative of outside diameter stress corrosion cracking. Your effort to

evaluate tube integrity by assessing growth rates for this type c,1 cracking by historical eddy

current data reviews / comparisons and in situ pressure tes'.ing evidenced an aggresdve

program. Program improvements wero noted by the inspectors in the implementation of eddy

current procedures for the examination of the steam generator tubing. Improved process

techniques were noted in the steam generator tube sleeving repairs 0

in accordance with 10 CFR 2.790 of the Commission's regulations, a copy of this letter and the

enclosed inspection report will be placed in the NRC Public Document Room.

We will gladly discuss any questions you have concerning this ir'pection.

Sincerely,

p

Original Signed By J. A. Grobe [

9712170042 971205

PDR ADOCK 05000202 John A. Grobe, Director

G PDR . Division of Reactor Safety

Docket No. 50 282

License No. NPF-42

Enclosure: Inspection Report 50-282/97020(DRS)

I'IlIIiji!

! . n . . ll

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SCO.Stached Distribution

DOCUMbNT NAME: G:\DRS\PRA97020.DRS (See Previous Concurrence)

To receive a copy of tMs document. Indicate in the box 'C's Copy w/o attacNend *E' = Copy w/attacNend *N* a No copy

OFFICE Rlli:DRS l Rill:DRS l Rlli:DRP l Rill:DRS l

NAME Schapker/sd Gavuta McCormick-Darger Grobe

DATE 12/ /97 12/ /97 12/ /97 12/ /97

g g n ,o .a !q OFFICIAL RECORD COPY

/,go \

_ --

_ _ _ _ _ _ _ _

.

.

Mr. M. D. Wadley

Vice President, Nuclear Generation

Northern States Power Company

414 Nicollet Mall

Minneapolis, MN 55401

SUBJECT: NRC INSPECTION REPORT 50-/97020(DRS)

Dear Mr. Wadley:

On November,19,1997, the NRC completed an inspection at your Prairie Island, Unit 1,

reactor facility. The enclosed report presents the results of that inspection.

The inspection included a review of the Unit i steam generator tube inservice inspection

activities. The indications identified during steam generator tube eddy current examination

woro prednminantly axially oriented indications located ir the tube roll transition in the

tubesheet region; indica'ive of outside diameter stress cr>rrosion cracking. Yout effort to

evaluato tube integrily by assessing growth rates for this type of cracking by historica' eddy

current data reviews / comparisons and in situ pressure testing evidenced an aggressive

program. Program irnprovements were noted by the inspectors in the implementation of eddy

current procedures for the examination of the steam generator tubing. Improved process

techniques were noted in the steam generator tube sleeving repairs 0

In accordance with 10 CFR 2.790 of the Commission's regulations, o copy of this letter and the

enclosed inspection report will be placed in the NRC Public Document Room.

We will gladly discuss any questions you have concerning this inspection.

Sincerely,

John A. Grobe, Director

s'ivision of Reactor Safety

Docket No. 50-282

License Nu. NPF-42

Enclosure: Inspection R3 port 50-/97021(DRS)

SeftAllachp.d_Qlstribution

DOCUMENT NAME: G:\DRS\PRA97020.DRS

to receive a co sy of this document indicate in the box *c' a copy w/o attadvend *E' = Copy w/ attach /end *N's No copy

OFFICE Rill:DRS k.k Rill:DRS _l4 Rill:DRP M d Rlli:Df3Gd , l

NAM 7. Schapker/sd l\ Gavpla ' 1h McCormictt-3arger GrobQQ

DATE 12/3 /97 12/ 'a /97 0 ~ 12/3/97 12/4 /$7

OFFICIAL RECORD COPY

- - _ - _ _ _ _ - - _ _ _ - _ _ _ _ - -

M. D. Wadley 2 DL W 5, 1997

cc w/ encl: Plant Manager, Prairie Island

State Liaison Officer, State

of Minnesota

State Liaison Officer, State

of Wir,consin

Tribt.i Council, Prairie Island

Dakota Community

Distribution:

Docket File w/enct Rill PRR w/enci J. L. Caldwell, Rill w/ encl

PUBLIC IE-01 w/enct SRI, Prairie it.laiw w/ encl Rlli Enf. Coordinator w/enci

OCFOILFARB w/enci LPM, NRR w/enct TSS w/enci

DRP w/enct A. B. Beach, Rlll w/enci DOCDESK w/enci

DRS w/enci CAA1 w/enct

_ - _ _ ._ _ _ _..