ML17303A778
| ML17303A778 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 02/24/1988 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 161-00818-EEVB, 161-818-EEVB, TAC-57419, NUDOCS 8803010394 | |
| Download: ML17303A778 (6) | |
Text
REGULA
. Y INFORMATION DISTRIBUTI SYSTEM (RIDS)
ACCESSION NBR:8803010394 DOC. DATE: 88/02/24 NOTARIZED:
NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Stationi Unit ii Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION VAN BRUNT'. E.
Arizona Nuclear Power Prospect (formerly Arizona Public Serv REC XP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Discusses reexam of diesel generator cooling 5 essential cooling eater sos on planti per 850530 commitment. No evidence of microbiologicallg induced corrosion or stress corrosion cracking observed.
DISTRIBUTION CODE:
AOOiD COPIES RECEIVED: LTR l ENCL Q
SIZE TITLE:
OR Submittal:
General Distribution NOTES: Standardized plant.
05000528 RECIPIENT ID CODE/NAME PD5 LA LICITR*iE COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD5 PD DAVIS> M COPIES LTTR ENCL 5
INTERNAL: ACRS NRR/DEBT/ADS7E4 NRR/DEBT/MTB 9H NRR/DOEA/TSBiiF OGC i5-B-i8 RES/DE/EIB EXTERNAL'PDR NSIC i
i ARM/DAF/LFMB NRR/DEBT/CEBSH7 NRR/DEST/RSB 8E I'M /ILRBi2 EG FILE Oi NRC PDR NOTES:
'0 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 28 ENCL
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Arizona Nuclear Power Project P.O. SOX 52034
~
PHOENIX, ARIZONA85072-2034 161-00818-,EEVB/PGN February 24,'1988 Docket No.
STN 50-528 U.S. Nuclear Regulatory Commission Washington, D. C.
20555 ATTN:
Document Control Desk
Reference:
Letter from E.
E. Van Brunt, Jr.,
ANPP, to G.
W. Knighton, NRC, dated May 30, 1985 (ANPP-32744);
Subject:
Proposed Reexamination Scope.
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Unit 1
Reexamination of Diesel Generator Cooling and Essential Cooling Water Systems on PVNGS Unit 1
-File:
88-056-026 Per the referenced letter, ANPP committed to perform visual examination of two heat exchangers and accessible piping in the spray pond system of PVNGS Unit 1
at the first refueling outage.
The examinations were required to determine if corrosion (including microbiologically induced corrosion (MIC)) or stress corrosion cracking had occurred.
On October 28,
- 1987, the B Train diesel generator heat exchangers and accessible associated piping were examined.
No evidence of MIC or stress corrosion cracking was observed.
For the jacket cooling ~ater heat exchanger and adjacent piping, there were a few small rust spots and pinhole defects at the edges of metal gasketed connections, in the epoxy lining of the channel head.
The lining was in excellent overall condition, well bonded, and with no evidence of delamina-tion.
The fuel oil cooler was found to have had no epoxy lining on the non-corrosion resistant
- surfaces, with expected general corrosion of unprotected carbon steel in a water environment.
The corrosion was cleaned off, the sur-faces were epoxy coated, and the heat exchanger and oil cooler were returned to service.
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USNRC Document Control Desk Page Two 161-00818-EEVB/PGN February 24, 1988 The B Train Essential Cooling Water Heat Exchanger was examined on November 3,
- 1987, and also showed no evidence of MIC or stress corrosion cracking.
There were a few pinhole defects in the channel heads.
Noticeable areas of pinhole defects were observed in the connecting piping elbows.
These are most likely due to erosive effects of small amounts of silt in the spray pond water; as they were observed on the far side of the elbow where the flow changes direction.
Defect areas were cleaned, recoated with epoxy, and the heat exchanger was returned to service.
The lining was in good overall condition, well bonded, with no evidence of delamination.
If you have any questions or require additional information, please call A. C.
Rogers at (602) 371-4041.
Very truly you s, E. E. Van Brunt, Jr.
Executive Vice President Project Director EEVB/PGN/cal cc:
0.
M. De Michele A. C. Gehr G.
W. Knighton E. A. Licitra J.
B. Martin J.
R. Ball
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