ML20064B047
| ML20064B047 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 09/27/1990 |
| From: | Parker T NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9010040267 | |
| Download: ML20064B047 (2) | |
Text
.,
L 4 3 o
I
~
.n--
4'4 Nicollet Mall Minneapolis Minnesota 554011927 Telephone (612) 330 5500 q
September 27, 1990 Technical Specification 4.12.E.1
]
i
~
i
' Director of Nuclear Reactor Regulation
.'U:S Nuclear Regulatory Commission
-t Attn:
Document Control Desk
-Washington, DC 20555 4
PRAIRIE IS1AND NUCl. EAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR.42 50 306 DPR-60 Steam Generator Tube Pluzelnc and Sleevine In accordance with Technical Specification 4.12.E.1,.the following steam generator tube plugging and-sleeving information is provided for the
[
~ information of the NRC staff.
Followingithe recent inservice inspection of the Unit-2 steam generators, twenty-nine tubes were' plugged for the first time.
The percentage of tubes
- plugged is'2.15% on' steam generator 21. The percentage of.tubos plugged is 4.52% on steam generator 22.
A summary is attached.
This information will be expanded upon in the ' Inservice Inspection Report for J'
Unit 2 which will be submitted within.90 days of the etid of the current refueling outage. Also Table 4.3-14 of the Prairie Island Updated Safety j*
LAnalysis Report will.be updated in the next revision.
All of the steam generator tube plugs susceptible to near term primary water stress corrosion cracking have now been removed and replaced in boti, 4.t 1 t
and Unit 2:per the. requirements of NRC Bulletin 89-01.
1 F
If you iave any questions concerning this information please call.
i I
.{
v V
homas M Iar er i
Manager.
f Nuclear Support Services m
3 onal Administrator - Region III, NRC c: _R 1
Senior Resident Inspector,'NRC ub URR Project. Manager, NRC G Charnoff f
AttaEhment:' Steam Generator Tube Plugging / Sleeving Summary f
g".m"..
q e
sN
- 9010040267 900927 m
PDR. ADOCK 05000282 jh.. '
a a-P.
PDC e,,
~
0
. J tk i 4
~,
4 At tachtnent Page 1 cf 1 STEAM GENERATOR TUBE PLUGGING / SLEEVING
SUMMARY
f Steam Generator No.- 21 Summarv
(
~
1 New Indications PluS6ed This Outage:
11 Total Tubes Plugged:
73 Total Tubes' Sleeved:
0 21 Steam Generator % Plugged:
2.15%
Plug.Romoval: 6 plugs removed and replaced.
New Indications j
Eleven tubes were plugged for thinning at the cold leg tube support.
- plate.
No other abnormal new indications were found.
Tube Plue Removal:
Six plugs were removed due to susceptibility to primary water stress corrosion cracking. All of these plugs were required to be removed by j
NRC Bulletin =89-01.
The tubes were replugged with Alloy 690 Combustion Engineering mechanical (rolled) tube plugs.
Eteam Generator No. 22 Summary New Indications Plugged This Outage:
18 Total Tubes Plugged:
153 Total Tubes Sleeved:
0 22 Steam Generator % Plugged:
4.52%
Plug Removal: 23 plugs removed and replaced.
F New Indications:
Eighteen tubes were plugged for thinning at the cold leg tube support-plates.
No other abnormal new indications were found.
Tube Plue Removal:
Twenty three plugs were removed due to susceptibility to primary water L
stress corrosion cracking. All of these plugs were required to be removed by NRC Bulletin 89-01.
-The tubes were replugged with Alloy 690 Combustion Engineering mechanical (rolled) tube plugs.
.r 1,i :
\\{*
P i
2
.