ML20236D104
| ML20236D104 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 07/16/1987 |
| From: | Diianni D Office of Nuclear Reactor Regulation |
| To: | Musolf D NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 8707300304 | |
| Download: ML20236D104 (4) | |
Text
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JllL 1 e 1997
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l Docket Nos. 50-282 DISTRIBUTION l
and 50-306 2 Docket J11esh DWigginton Local PDR GHolahan Mr. D. M.LMusolf, Manager NRC PDR PKreutzer Nuclear Support Services PDIII-3 r/f DDiIanni Northern States Power Company PDIII-3 s/f OGC-Bethesda l
414 Nicollet Mall EJordan JParlow j
Midland Square, 4th Floor ACRS (10) 1 Minneapolis, Minnesota 55401-i d
Dear Mr. Musolf:
j As.a result of the Surry pipe erosion / corrosion incident in Dacember of 1986, i
the NRC is preparing a report that will reference existing rerearch information available and describe the actions being taken by utilities regarding erosion /
corrosion in feedwater pipes in nuclear power plants. Central to an understand-ing of erosion / corrosion in pipes is an accurate assessment of erosion /corrison
. experience, piping design, feedwater and condensate chemistry and piping materials.
To ensure that both the NRC and the nuclear industry have available a comarehen-sive collection of data regarding erosion / corrosion in feedwater pipes, t1e NRC will assemble a summary of utility information related to ongoing water chemistry i
actions in pressurized water reactors. To enable us to accomplish this task, 1
we ask that you complete the enclosed questionnaire.
The information being requested is quite extensive and will require a diligent effort on your part and ours to assure accurate and timely completion. Also, we i
realize that parts of the information may already be available to the NRC, but not in a convenient format which is readily accessibh.
Therefore, we request 1
that you assist us by returning for each unit.a singh completed copy of the i
enclosed questionnaire to the Project Manager, U. S. Nuclear Regulatory Commission,-Washington, D. C.
20555, within 60. days of 7ceipt of this letter.
We believe the questionnaire is self explanatory; howa
, if questions arise or clarification is required, please contact your NRC Prsject Manager.
1 This request is covered-by Office of Management and Budget Clearance Number 3150-0011 which expires December 31, 1989. Comments on burden and duplication may_be directed to the Office of Management and Budget, Room 3208, New Executive Office Building, Washington, D. C.
20503.
Sincerely, i
8707300304 870716 Dominic C. Dilanni, Project Manager PDR ADOCK 05000292 Project Directorate III-3 i
P PDR Division of Reactor Projects o
Enclosure:
PWR Erosion-Corrosion Questionnaire h
cc: See next page 0ffice:
LA/PQIII-3 PM/PDIII-3 PD/PDIII-3 Surname: PKredtzer DDilanni/tg DWigginton Date:
07/q/87 07// 9/87 07/t//87 j
i
'i, i
L Mr. D. M. Musolf Prairie Island Nuclear Generating j
l' Northern States Power Company Plant
]
cc.
.j Gert.1d Charnoff, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.
Washington, DC 20037 Dr. J. W. Ferman l
Minnesota Pollution. Control Agency 520 Lafayette Road-St. Paul, MN 55155
)
a Mr. E. L. Watzl, Plant Manager.
1 Prairie Island Nuclear Generating Plant j
Northern States Power Company Route 2 Welch, Minnesota 55089 s
Jocelyn F. Olson, Esq.
Special Assistant Attorney General J
Minnesota Pollution Control Agency 1935 W. County Road, B2 1
Roseville, Minnesota 55113
{
U.S. Nuclear Regulatory Commission Resident Inspector's Office 1719 Wakonade Drive East Welch, Minnesota 55089 l
l Regional Administrator, Region III U.S. Nuclear Regulatory Commission j
Office of Executive Director for j
Operations 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. William Miller, Auditor 1
Goodhue County Courthouse l
Red Wing, Minnesota 55066 l
l l
1 l
l l
i
.a.
1 i
l ENCLOSURE 3 PWR EROSION-CORROSION QUESTIONNAIRE (Check or Circle All' Applicable) l Otility Company:
Unit Name NWe i
filled by:
Date:
Ptene No.
l In service: 19....
Water Treatment:
AVT with annonia. morpholine. hydrazine.
Condensate polishers: none, cation, powdex, mixed bed.
...% of feedwater flow; installed 19....: operated in: H-OH NH4-OH form.
Cooling waters fresh, salt, brackish, cooling tower.
Copper alloy condenser tubing: yes, no. Copper alloy FW heater tubes: LP. HP. none.
Boric acid used sint:e 19... during: operation, layup, low load soaks. other.......
A.
EROSION-CORROSION EXPERIENCE l.
Erosion-Corrosion identified in wet steam piping: yes, no.
i 2.
Erosion-Corrosion of HSR Chevrons or mesh: yes, no.
l Chevron materials stainless steel, carbon steel, other......................
l 3.
Erosion-Corrosion of feedwater piping:
yes, no.
Date found..................
l Feedwater piping materials:
4.
Erosion-Corrosion of:..... elbows...... Ts...... diffusers.......: reducers.
.... valves,.... orifices..... other components (specify)..................
S.
Erosion-Corros,lon of J-Tubes: yes, no.
6.
Erosion-Corrosion of feedwater distribution ring: yes, no.
7.
Erosion-Corrosion of turbine:
HP. LP: Identify components:
8.
Erosion-Corrosion of other cycle components (identify)...................... 3 9.
Feedwater temperature range where erosion-corrosion found: from.... to..... F
^
10.
Inspection frequency for feedwater piping..... years. Steam lines..... Sears.
II.
Inspection methods usedt ultrasonic thickness, radiography. visual, other......
8.
PIPING DESIGN 1.
Maximum feedwater flow velocity............ feet /second.
2.
No. of feed pumps operating at 100% load........ second pump On at
.....% load.
3.
Maximum flow velocity when only 1 pump is operating............... feet /second.
4.
No. of feedwater piping components:....... elbows....... Ts
...... diffusers.
...... reducers....... valves....... orifices.
...... other components (specIfy)
S.
Maximum flow velocity in wet steam piping............ feet /second.
6e feedwater pressures and temperatures (agtual (preferred) or design):
Full load (pressure. osla/ temperature, f):
P:
P:
P:
P:
P:
T:
T:
T:
T:
T:
U 9
y y
l g
y Condensate Pump Cond. Polishers 8F Pump Steam Generators low load (typical
...% of full load):
O P:
P:
P:
P:
P:
T:
T:
T:
T:
T:
U P
(
g y
Q P
4 7
Concensate Pump Cond. Polishers BF Pump Steam Generators Please attach cooles of the heat tyalance diaorams for your actual full load and typical low load.
-g-
b C.-
fEEDWATER ANQ CONDENSATE CHEMISTRY 1.
.Please complete the attached Table.
' 2.
Feedwater chemistry history (average or typical values.. final feedwater):
Year of oper.:
1st
-1974 ~ 'l976 1978 1980 1982 1983 1985 1986 1987 k-pH of FW maximum.
minimum.
)
average.
.pH of condensate maximum.
minimum'.
i average.
D0. ppb maximum.
minimum.
average.
Cat. Cond. uS/cm.
Spec. Cond. uS/cm.
NH. ppb N,4,. ppb
_Mron, ppb Air inleakage.-
SCFM Please send any water chemistry sunnery reports and data.
I
(
3.
Chemical additions 3.1 Ammonias typical concentration in feedwater".... ppb; added at...........
3.2 Hydrazine
typical concentration in feedwater.... ppb; added at.........
{
3.3 Boric acid typical concentration in feedwater.... ppb as B; f
added at..................
i D.
NATERIALS 1.
Feedwater piping - IIst ASTM or other specification numbers....................
2.
Wet steam piping:
3.
Attach results of chemical analysis by you or pib vendors.
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