ML20236D104

Requests Assistance in Completing Encl Questionnaire Re Erosion/Corrosion in Feedwater Pipes in Nuclear Plants.Nrc Preparing Rept That Will Ref Existing Research Info as Result of Surry Pipe Erosion/Corrosion Incident in Dec 1986

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)

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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 '

o Division of Reactor Projects

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

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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  !

j U.S. Nuclear Regulatory Commission j

Office of Executive Director for Operations 799 Roosevelt Road

, Glen Ellyn, Illinois 60137 Mr. William Miller, Auditor 1 Goodhue County Courthouse l Red Wing, Minnesota 55066 l l

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' l ENCLOSURE 3 PWR EROSION-CORROSION QUESTIONNAIRE (Check or Circle All' Applicable)

Otility Company: Unit Name NWe l 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: ..... -

g U 9 y y l 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:

g U Concensate Pump y

Cond. Polishers P

Q BF Pump P

4 7 (

Steam Generators Please attach cooles of the heat tyalance diaorams for your actual full load and typical low load.

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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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