ML17298C179

Forwards Response to NRC 840522 Questions on Plant Spray Ponds

ML17298C179
Person / Time
Site:	Palo Verde
Issue date:	05/24/1985
From:	VAN BRUNT E E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	KNIGHTON G W Office of Nuclear Reactor Regulation
References
ANPP-32730-EEVB, TAC-57419, NUDOCS 8505300219
Download: ML17298C179 (9)

Text

REGULAT%FORMATION DISTRIBUTIO EM (RIDS)ACCESSION NOR+8505300219 DOC~DATEo 85/05/24 NOTARIZED:

YES.DOCKET FACILiSTN 50-528 Palo Verde Nuclear Station~Un)t li Arjzana Publi 05000528 STN-50 529 Palo Verde Nuclear Station~Unit 2i Arizona Publi 05000529 STN 50-530 Palo Verde Nuclear Station~Unit 3~Arizona Publi 05000530 AUTH~NAME AUTHOR AFFILIATION VAN BRUNTiE;ED Arizona Public Service Co~RECIP,NAME RECIPIENT AFFILIATION KNI GHTON g G~l'l~Licensing Branch 3

SUBJECT:

Forwards response to NRC 840522 questions on ponds.DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR ENCL TITLE: OR Submittal:

General Distribution NOTES:Standardized plant~OL: 12/31/84 Standardized plant.Standardized plant.plant" spray S I ZE'i 05000528 05000529 05000530 RECIPIENT ID CODE/NAME NRR LB3 BC 01 INTERNAL;ACRS 09 ELD/HDS3 NRR/DL DIR NRR/DL/TSRG NRR/DSI/RAB RGN5 COPIES LTTR ENCL 7 7 6 6 1 0 1 1 1 1 1 1 RECIPIENT ID CODE/NAME ADM/LFMB NRR/DE/MTEB NRR/DL/ORAB ETB REG F ILE 04 COPIES LTTR.ENCL 1 0 1 1 1 0 1 1 1 1 EXTERNAL: EGLG BRUSKEiS NRC PDR 02 1 1 1 1 LPDR NSIC 03 05 1 1 1 1 TOTAL NUMBER OF COPIES REQUIRED'LTTR 27 ENCL 24 III~h I II 14 If Arizona Nuclear Power Project P.o.BOX 52034 4 PHOENIX, ARIZONA 85072-2034 Director of Nuclear Reactor Regulation Mr.George W.Knighton, Chief Licensing Branch No.3 Divisio'n of Licensing U.S.Nuclear Regulatory Commission Washington, D.C.20555 ANPP-32730-EEVB/WFQ May 24, 1985

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Units 1, 2, and 3 Docket Nos.STN 50-528(License No.NPF-34)/529/530 Spray Pond Questions File: 85-004-419.06

Dear Mr.Knighton:

Attached please find a copy of APS responses to NRC questions on the PVNGS spray ponds.These questions were provided in a telephone conversation with the NRC on May 22, 1984.Very truly ours, 8 E.E.E.Van Brunt, Jr.Executive Vice President Project Director EEVB/WFQ/slh Attachment cc: R.P.Zimmerman E.A.Licitra A.C.Gehr 8505300219 850M4 PDR ADOCK 05000528 P PDRI

~~4I STATE OF ARIZONA))SSe COUNTY OF MARICOPA)I, Edwin E.Van Brunt, Jr., represent that I am Executive Vice President, Arizona Nuclear Power Project, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true.Edwin E.Van Brunt, Jr.Sworn to before me thie~Adey of I 1985.t e r, My Commi'ssion Expires: My Camrrifs"ion Expires April 6, 1987 Notary Pub ic IE" h 4 ty ATTACHMENT Specific NRR+estions on the PVNGS Spray Pond Pitting Problem (DG)heat exchangers or the essential cooling water heat exchangers since the MIC was discovered in the spray pond pipingt APS RESPONSE-No.Visual examinations have been performed on the spray pond water side of those heat exchangers in the past 2 years, and only minor repairs were required in those areas where the plasite (epoxy)lining had failed.These failures were due to either improper lining application/

curing, or normal local defects that develop in most coatings/linings used in water service.Such defects will continue to be experienced in the future, and will be repaired as routine maintenance items.There is no evidence of established bacteria colonies of any species, and no evidence of MIC.Such evidence would have been observed if it had been present, even before the spray pond piping pitting was documented.(HX), and what is their resistance to chloride induced stress corrosion cracking (SCC)and pittingP APS RESPONSE-All of the DG Heat Exchangers use epoxy lined carbon steel shells and end caps, Admiralty tubes and 70-30 copper nickel tube sheets.All of these materials have excellent resistance to both chloride pitting and stress corrosion cracking.cooling water heat exchangers.

4 APS RESPONSE-Same as Number 2, except that the tube sheets are 70-30 copper nickel cladding on carbon steel.on these heat exchangersP APS RESPONSE-The revised water chemistry program will prevent the establishment of all species of bacteria.All previous corrosion has been minor and not related to bacteria.Feedwater Piping (AFW)System since the discovery of the spray pond pitting.APS RESPONSE-On March 22, 1985, the PVNGS inservice inspection group supervisor personnally examined portions of both AFW trains.He is a certified Level III Examiner in Visual Examination.

Two stainless steel spool pieces were removed (one in each train)and a total of ten stainless steel welds were examined.No evidence of MIC or other corrosion was observed.

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