ML17206A941

Forwards Info Re Fabrication,Insp & Operating History of Feedwater Lines in Further Response to 790525 Request

ML17206A941
Person / Time
Site:	Saint Lucie
Issue date:	07/31/1979
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Stello V Office of Nuclear Reactor Regulation
References
L-79-205, NUDOCS 7908070395
Download: ML17206A941 (8)

Text

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REGULATORY:ORMATION DISTRIBUTION SY. M (RIDS)

', ACCESSION NBR:7908070395 DOC ~ DATE: 79/07/31 NOTARIZED: NO DOCKET FACIL:50-335 St. Lucie Plant~ Unit 1~ Florida Power 8 Light Co. 05000335 AUTH ~ NAME AUTHOR AFFILIATION UHRIGgR ~ E, Florida Power 8 Light Co, REC IP ~ NAME RECIPIENT AFFILIATION STELLOeV ~ Division of Operating Reactors

SUBJECT:

Forwards info re fabricationiinsp 8 operating history of feedwater lines in further response to 790525 request.

DISTRIBUTION CODE: A001S COPIES RECEIVED:LTR ~ ENCL, + SIZE:

TITLEe GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LIC ES' m Mm at M W W &OO MW M W M W ~ ~ MM ~+I MMM W m W M mm W m a% W m M m 'W W M W M&M W W W We W M W OP &W &W1 W f% w W W W W W w W M &w &

II REC IP IENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ACTION; 05 BC d/P8 ~g 7 7 INTERNAL: REG FILE .1 02 NRC PDR 1 1 1

15 17 CORE PERF ENGR BR BR 2

1 1

2 1

1 10 TA/EDO 16 AD SYS/PROJ 18 REAC SFTY BR'0 1,

1 1

1 1

1 19 PLANT SYS BR 1 1 EEB 1 1 21 EFLT TRT SYS 1 1' BRINKMAN 1 1 OELD 0 EXTERNAL: 03 LPDR 1 04 NSIC 1 1 23 ACRS 16 16 AUG 8 AH TOTAL NUMBER OF COPIES REQUIRED: LTTR 39 ENCL 38

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FLORIDA POWER 4 LIGHT COMPANY July 31, 1979 L-79-205 Office of Nuclear Reactor Regulation Attention: Mr. Victor Stello, Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Stello:

Re: St. Lucie Unit 1 Docket No. 50-335 Feedwater Nozzles Our letter of June 20, 1979 (L-79-170) responded in part to your May 25, 1979 request for information concerning PWR feedwater lines.

The remaining information on fabrication, inspection, and operating history is attached.

Very truly yours, obert E. Uhrig Vice President Advanced Systems 5 Technology REU/MAS/paf Attachment cc: J. P. O'Reilly, Region II Harold Reis, Esquire PEOPLE... SERVING PEOPLE

PRESERVICE/INSERVICE INSPECTION AND OPERATING HISTORY ITEI'1 1 RE UEST State whether the feedwater system welds received a preservice inspection in accordance with ASME B8PV Code,Section XI.

RESPONSE

The St. Lucie Unit 1 feedwater system welds received a preservice inspection in accordance with the ASME BEPV Code,Section XI.

ITEN 2 RE(EUEST Provide the extent of inservice inspection performed on the feedwater pipe to steam generator nozzle welds. Include the results of the examinations, any corrective actions taken and causes of any failures.

RESPONSE

Inservice inspection has not been performed on the St. Lucie Unit 1 feedwater pipe to steam generator nozzle welds. An inspection in accordance with IE Bulletin 79-13 is scheduled for late September or early October, 1979.

ITEN 3 REQUEST Proyide the schedule and extent oi'nservjce inspection for'he feedwater system for the next inspection interval.

RESPONSE

The'feedwater system is a Class 2 system, therefore, inservice inspections are spread throughout the entire 40 year life of the plant. In accomplishing the routine Inservice Inspection Program, only a small portion of the feedwater system need be inspected during each period. However, all feedwater system welds inside containment, plus the connection to the auxiliary feedwater system outside containment, will be inspected in accordance with IE Bulletin 79-13.

FABRICATION HISTORY ITEN 3

~RE UEST Provide the NDE performed during and after fabrication of the weld joints requested in questi on 2.

RESPONSE

The required NDE on the subject welds was 100/ radiography, 100/ magnetic particle or liquid penetrant, plus 100/ visual examination.

ITEN 4 RE UEST Provide the Code edition to which the feedwater piping system was fabricated.

RESPONSE

The feedwater piping system was fabricated in accordance with the ANSI 831.1 and B31.7 codes - 1967 Edition. All feedwater piping inside containment was fabricated in accordance with Safety Class II-ANSI B31.7 requirements.

ITEN 5 REQUEST State the fracture toughness requirements, if any, for the feedwater piping system.

RESPONSE

No fracture toughness requi rements existed nor were they imposed on the feedwater piping system.

RE UEST Provide any history of water hammer or vibration in the feedwater system and design changes and/or actions taken to prevent these occurrences.

RESPONSE

Preoperational test 80700080A was performed during initial power ascension testing in 1976 with no evidence of any feedwater hammer. During an extensive shutdown in the latter half of 1976 the plant was notified of a possible problem with one inch diameter standpipes then used to prevent draining of the feed rings . Due to standpipe fati gue fail ure caused by flow induced vibration, the standpipes were removed and replaced by "J" tubes on top of the feed rings ( Plant Change/Modification 196-76).

Another preoperational test, entitled Steam Generator Feedw~ter Hammer Test (Test 80700080B) was conducted during power ascension testing in February 1977.

The test results indicated the absence of any detectable water hammer in piping in the main feedwater or auxiliary feedwater systems and supported the prediction that none should be anticipated during operating plant transients. The test was witnessed by an NRC representative and a copy of the completed test report was transmitted to Hr. Dennis Ziemann, Chief of Operating Reactors Branch b2, Division of Operating Reactors, USNRC, by FPSL letter L-77-70, dated March 2, 1977.

Subsequently, no evidence of excessive vibration or water hammer has been detected in ei ther the main feedwater or auxiliary systems during the operating history of the plant.

ITEN 5

~E(EUEST Provide a description of feedwater chemistry controls and a summary of chemistry data.

RESPONSE

The following table outlines the feedwater system chemistry program used at the St. Lucie Plant.

Parameter Vendor Guidelines Normal 100K Power

l. Feedwater (a) pH 8.6 - 9.2 8.7 - 8.9 (b) Hydrazine 5 - 30 ppb 7 12 ppb Dissolved 02

'c)

<10 ppb <5 ppb (d) Copper <10 ppb 5 - 15 ppb Iron <10 ppb 10 - 25 ppb (e) Suspended Solids 1 ppm 50 - 100 ppb

2. Condensate (a) Dissolved 02 <109 ppb <5 ppb (b) Ammonia <1 ppm .2 .3 ppm