ML18153B813

Responds to Generic Ltr 89-08, Erosion/Corrosion Induced Pipe Wall Thinning. Secondary Piping Insp Program Consisting of Systematic & Formalized Erosion/Corrosion Monitoring Program Implemented

ML18153B813
Person / Time
Site:	Surry, North Anna, 05000000
Issue date:	07/11/1989
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
89-388, GL-89-08, GL-89-8, NUDOCS 8907180265
Download: ML18153B813 (4)

Text

. , .

I e e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 11, 1989 United States Nuclear Regulatory Commission Serial No.89-388 Attention: Document Control Desk MWH/ETS Washington, D. C. 20555 Docket Nos. 50-280 50-281 50-338 50-339 License Nos. DPR-32 DPR-37 NPF-4 NPF-7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 RESPONSE TO GENERIC LETTER 89 - 08 EROSION / CORROSION - INDUCED PIPE WALL THINNING NRC Generic Letter 89-08, Erosion/Corrosion-Induced Pipe Wall Thinning, has requested holders of operating licenses to provide assurances that a systematic erosion/corrosion program has been implemented for single phase and two phase high energy carbon steel lines.

The Company has implemented a Secondary Piping Inspection Program which consists of a systematic and formalized erosion/corrosion monitoring program for carbon steel, high energy, secondary piping components. The Secondary Piping Inspection Program has been developed to provide a standardized method of identifying, inspecting, evaluating, and tracking piping components in the secondary side systems at the nuclear stations which are potentially susceptible to erosion/corrosion (single or two phase flow).

The inspection program was initiated after the pipe rupture at Surry Nuclear Station Unit 2 on December 9, 1986. The initial program used during the resulting forced outage is described in previous Company correspondence to the NRC noted in the Attachment .

39()7 :L ::::Ci2C,5 ==:';;°"'()71~i- -- -- -

-A,:;rfi PDR ADOCK 05000280 ( (

p PDC

The Secondary Pipe Inspection Program has been upgraded to incorporate lessons learned during subsequent inspections and it does meet the intent of the current NUMARC guidelines. It encompasses the following areas:

• Responsibilities

• Historical Development of System and Component Selection Criteria

• Inspection Plans and Component Inspection Lists

• NOE Inspection Procedures

• Data Evaluation Methodology

• Component Tracking for Future Outage Inspections

• EPRI Computer Codes - CHEC/CHECMATE The Secondary Inspection Program is currently implemented by station and NOE procedures. This program will be controlled for long term application by formally incorporating it into the Nuclear Design Control Program by January 1, 1990.

The information provided in this response is true and accurate to the best of my knowledge.

Very truly yours, v.L~Sa?

Senior Vice President - Power Attachment cc: U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.

Suite 2900 Atlanta, Georgia 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station

ATTACHMENT VIRGINIA ELECTRIC AND POWER COMPANY EROSION/CORROSION CORRESPONDENCE TO THE NRC

1. January 14, 1987 letter to Dr. J. Nelson Grace, Regional Administrator USNRC, Region II from W. L. Stewart, Vice President - Nuclear Operations, Virginia Electric and Power Company, Serial No.87-009, Reactor Trip and Feedwater Pipe Rupture.

2. March 6, 1987 letter to Dr. J. Nelson Grace, Regional Administrator USNRC, Region II from W. L. Stewart, Vice President - Nuclear Operations, Virginia Electric and Power Company, Serial No.87-108, Feedwater Pipe Repair

3. April 16, 1987 letter to USN RC Document Control Desk, from W. L. Stewart, Vice President - Nuclear Operations, Virginia Electric and Power Company, Serial No. 87-108A, Feedwater Piping Examination and Evaluation.

4. September 11, 1987 letter to USNRC Document Control Desk, from W. L.

Stewart, Vice President - Nuclear Operations, Virginia Electric and Power Company, Serial No.87-427, Response to IE Bulletin 87-01.

... ' ~

COMMONWEALTH OF VIRGINIA )

)

COUNTY OF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by W. L. Stewart who is Senior Vice President - Power, of Virginia Electric and Power Company. He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.

Acknowledged before me this / / day of 9"'J , 19.8!_.

My Commission Expires: ~Nl<<!Aj ZS: , 19ft.

___A~-

Notary Public (SEAL)/ -,,

> ' ~-

f

~-:-