ML17299A426

Responds to NRC 850514 Request for Addl Investigation of Allegation RV-85-A-022 Re Use of Cleaning Solvents in Essential Spray Pond Cooling Sys.Cooling Sys Corrosion Not Due to Improper Use of Cleaning Solvents

ML17299A426
Person / Time
Site:	Palo Verde
Issue date:	06/18/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Kirsch D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-32845-TDS, NUDOCS 8507150613
Download: ML17299A426 (8)

Text

RECEIVED NBC Arizona Nuclear. Power Projec)IIIIS gw 2g AN }O: 08 P.O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 June 18, 1985 AGIO"~ V IoE ANPP-32845-TDS/PJC U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. D. F. Kirsch, Acting Director Division of Reactor Safety and Projects

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License No. NPF-41)

Allegation. No. RV-85-A-022 Use of Cleaning Solvents in Essential Spray Pond Cooling System File: 85-019-026; D.4,33.2

Reference:

Letter from D. F. Kirsch to E. E. Van Brunt, Jr., dated May 14, 1985.

Dear Sir:

This letter refers to your request for a more detailed investigation of Allegation No. RV-85-A-022. The results of our investigation are provided as Attachment A.

Very truly ours (RR I E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/PJC/plk cc: See Page Two 85071506f 3 8506l8 PDR ADOCK 05000528 Pl)R'

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4 ANPP-32845-TD3/PJC

~'r.- D. F. Kirsch

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Allegation No. RV-85-A-022 Page Two CC'ichard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. CD 20555 D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L. A. Souza D. E. Fowler T. D. Shriver C. N. Russo B. S. Kaplan J. R. Bynum J ~ M. Allen D. Canady W. J. Stubblefield W. G. Bingham R. L. Patterson R.'. Welcher H. D. Foster D. R. Hawkinson M. L. Clyde B.-T. Parker'.

J. Bloom D. N. Stover J. D. Houchen J. E. Kirby B. Cederquist R. K. Nelson L. G. Papworth A. C. Gehr E. A. Licitra R. P. Zimmerman Records Center Institute of Nuclear Power Operations 1000 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339

p ATTACHMENT A Response to Allegation RV"85"A"022 I. ALLEGATION Corrosion in the essential spray ponds (or essential spray pond cooling system) is not due to microbiologically induced corrosion, but rather due to the use of too strong a cleaning solvent. This use affected the welds at the junction between different pipe diameters in the cooling system.

In your response to this allegation, please include a discussion of what solvents were used in the Essential Cooling Water System, what measures were used to control their application, and whether any deleterious effects from these solvents have been observed.

II. INVESTIGATION A. Solvents Used/A lication Controls Project records, including those of the pipe supplier (Pullman Power), Construction (BPC), and ANPP Nuclear Operations were reviewed to determine what solvents have been used in the Essential Spray Pond Cooling System with the following results:

1. Prior to shipment to PVNGS,'he supplier cleaned the piping using either acetone or ethyl alcohol, followed by Turco Plaudit which is a detergent. A deionized water rinse com-pleted the cleaning. This activity was conducted in accord-ance with the supplier's Procedure Number JS-150.

2. Only one solvent, Oxylene (M-6), was used by Bechtel during post-construction cleaning of spray pond piping. Oxylene (M-6) is an approved material per WPP/QCI 14.0, "Approved Materials for Construction Nuclear Compatibility", and its use is controlled by Procedure Number 16, "Field Procedure for Cleaning External Surfaces of Stainless Steel Pipe", of Drawing 13-P-ZZG-012 (Piping Material Classifications).

3. ANPP Maintenance records, including a review of approximately 350 Work Orders performed since 1983, confirm that three solvents have been used during spray pond maintenance activities.

These are Oxylene (M-5) and Magnaflux SKC-5 and SKC-NF (formula B spot check cleaners). All of these solvents are on the ANPP Approved Materials List (AML), Station Manual Procedure 73AC-9ZZ07.

All applications are controlled by ANPP Work Control Procedures (e.g., 30AC-9ZZ01, 30AC"9ZZ02, 30AC-OZZ09) in accordance with Vendor Technical Manuals. Qualified personnel performed the work, and good housekeeping practices were followed.

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- 'ttachment A

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Page Two B. Effects of Solvent Use No deleterious effects have been traced to the use of cleaning solvents in the Essential Spray Pond Cooling System.

III. CONCLUSION Based upon the results of this investigation, it is concluded that the corrosion present in the Essential Spray Pond Cooling System is not due to the improper use of cleaning solvents. Therefore, no corrective actions related to the use of solvents are deemed necessary.

In conjunction with LER 85-019 and the DER 85-10, a broad corrective action program is being developed and implemented to control corrosion and ensure the spray ponds'afety function capabilities are main-tained.

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