ML20203E375
| 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: |
| 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
ADOCK 05000202
John A. Grobe, Director
G
Division of Reactor Safety
.
Docket No. 50 282
License No. NPF-42
Enclosure: Inspection Report 50-282/97020(DRS)
I'IlIIiji!
ll
!
n
.
.
.
'*
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 ! q
OFFICIAL RECORD COPY
/,go \\
.a
_ --
_ _ _ _ _ _ _ _
.
.
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
_ - _ _
._ _ _ _..