ML17334B816

NPDES Noncompliance Notification:On 980617,discovered Lube Oil Discharge.Caused by Leaking Tubes Due to Corrosion of Tubes.Leaking Tubes Repaired & Established Insp/Preventive Maint Program for Lube Oil Coolers

ML17334B816
Person / Time
Site:	Cook
Issue date:	07/08/1998
From:	Sampson J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:1208AA, NUDOCS 9807150232
Download: ML17334B816 (8)

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CATEGORY 1 REGULATORY INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION NB%:9807150232 DOC.DATE: 98/07/08 NOTARIZED: NO DOCKET I FACIL:50-315 Donald C. Cook Nuclear Power Plant, Unit 1, Indiana M 05000315 SI)~-316 Donald C. Cook Nuclear Power Plant, Unit 2, Indiana M 05000316 AUTH. NAME AUTHOR AFFILIATION SAMPSON,J.R.. Indiana Michigan Power Co.

RECIP.NAME RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)

SUBJECT:

- NPDES noncompliance notification:on 980617,discovered lube oil discharge. Caused by leaking tubes due to corrosion of tubes. Leaking tubes repaired & established insp/preventive A maint program for lube oil coolers.

T DISTRIBUTION CODE: IE23D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Environmental Event Report (per Tech Specs)

NOTES:

RECIPIENT COPIES 'ECIPIENT COPIES 0 ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD3-3 PD 1 1 STANG, J 1 1 INTERNAL ILE CENTE 1 OGC/HDS3 1 1 3 1 1 EXTERNAL: NOAC 1' NRC PDR 1 1 D

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N NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 7 ENCL 7

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Indiana Michigan Power Company 500 Circle Drive Buchanan, Ml 491071395 IRON NA MICHIGAN PQMfM July 8, 1998 AEP: NRC: 1208AA Docket Nos: 50-315 50" 316 U. S. Nuclear Regulatory Commission ATTN: Document Control" Desk Mail Stop 0-P1-17 Washington, D.C. 20555 Gentlemen:

Donald C. Cook Nuclear Plant Units 1 and 2 LUBE OIL DISCHARGE - NPDES NOTIFICATION The attached notification is forwarded for your information pursuant to Cook Nuclear Plant's Appendix B (Environmental) technical specifications. The subject concerns the inadvertent discharge of lube oil and the actions taken to mitigate the situation.

Should you have any questions or concerns regarding this notification, please contact Walter T. MacRae at 616/697-5067.

Sincerely, J. R. Sampson Site Vice President

/vlb Attachment cc: J. A. Abramson MDEQ - DW & RPD NRC Resident Inspector C. J. Paperiello c La di) 0 9807i 50232 980708

( PDR ADOCK 05000M5 8 PDR

ATTACHMENT TO AEP:NRC: 1208AA LUBE OIL DISCHARGE - NPDES NOTIFICATION

American Electric Power Cook tluclear Plant Ore Cook Place Biidgman. Ml 49106 616 465 5901 AMERICAN EI.ECTRIC POWER Mr. Fred Morley, District Supervisor Surface Water Quality Division Michigan Department of, Environmental Quality 1342 SR 89 West Suite B Plainwell, Ml 49080 June 25, 1998

Subject:

Donald C. Cook Nuclear Plant NPDES Permit No. MI0005827 As required by NPDES Permit MI0005827, Part II. Section A.6. Spill Notification, this written notification is being provided.

The Cook Plant's service water system cools the main turbine lube oil reservoir. This water system eventually discharges to Lake Michigan via Outfalls 001 and 002. On June 17, 1998, at 0100 hrs, the service water system cooling the unit 2 main turbine lube oil reservoir was found to have a tube failure. The heat exchanger was isolated immediately to prevent further oil leakage into the service water system, and spill cleanup commenced.

A visual survey of the unit 1 discharge showed very small oil sheens (<'2" in diameter) that surfaced and broke up within 20 feet of the discharge. The unit 1 circulating water system was removed from service June 17, 1998, at 1359 hrs to prevent additional oil from reaching the lake. Further surveys later in the day verified that the small oil sheens were no longer present in the unit 1 discharge.

An inspection dive was conducted on June 19, 1998, to verify that there was no accumulated oil in the unit 1 discharge tunnel prior to restarting the unit 1 circulating water system. The unit 1 circulating water system was returned to service on June 19, 1998, at 2300 hrs.

It was initially estimated that approximately 900 gallons of Mobile DTE 797 oil leaked via this pathway over a 24-hour period. However, based on estimates of the amount of oil collected from the cooler itself, and by absorbents placed in the circulating water system, we conservatively estimate the amount of oil released to Lake Michigan to be 780 gallons.

The leaks were caused by corrosion of the tubes, and have been repaired. An inspection/preventive maintenance program has been established for the lube oil coolers using fiber optics and eddy current testing to monitorcorrosion, followedby

Mr. Fred Morley Page 2 June 25, 1998 corrective actions to prevent tube failure. The coolers will be eddy current tested and repaired if necessary, prior to placing them back in service.

If you have any questions, please contact me at (616) 465-5901, ext. 1153.

Sincerely, J. P. Garison Environmental Compliance Manager

Mr. Fred Morley Page 3 June 25, 1998 I certify under penalty of law that I have personally examined and am familiar with the information submitted on this and all attached documents; and based on my inquiry of those individuals immediately responsible for obtaining the information, I believe the submitted information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment.

J. R. Sampson Site Vice President

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