ML20199K898

Responds to NRC Re Violations Noted in Insp Repts 50-317/85-30 & 50-318/85-32.Corrective Actions:Reactor Coolant Pump Seal Task Force Reviewing Operation & Maint Procedures

ML20199K898
Person / Time
Site:	Calvert Cliffs
Issue date:	03/28/1986
From:	Tiernan J BALTIMORE GAS & ELECTRIC CO.
To:	Wenzinger E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8604100249
Download: ML20199K898 (4)

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A B ALTIMORE GAS AND ELECTRIC CHARLES CENTER P.O. BOX 1475 BALTIMORE, MARYLAND 21203 JoscPH A.TIERNAN vice PRcssocNT NUCLEAR ENERGY March 28,1986 U. S. Nuclear Regulatory Commission Docket Nos. 50-317 Region I 50-318 631 Park Avenue License Nos. DPR-53 King of Prussia, PA 19406 DPR-69 ATTENTION: Mr. Edward C. Wenzinger, Chief Projects Branch No. 3 Division of Reactor Projects Gentlemen:

This refers to Inspection Report 50-317/85-30, 5G-318/85-32; which identifies apparent weaknesses in the maintenance of our Emergency Diesel Generators (EDG). We have conducted a thorough review of the inspection results and our related EDG maintenance and housekeeping practices.

Enclosure (1) to this letter is a written statement in reply to those and other concerns noted in your letter of January 14,1986.

Should you have further questions regarding this reply, we will be pleased to discuss them witn you.

Very truly yours, M

JAT/SRC/ dim Enclosure cc: D. A. Brune, Esquire

3. E. Silberg, Esquire D. H. ~affe, NRC T. Foley, NRC i

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l ENCLOSURE (1)

REPLY TO NRC INSPECTION REPOf T 50-317/85-30; 50-318/85-32 _

Emergency Diesel Generators Although the reliability and availability of the emergency diesel generators at Calvert Cliffs is high, a review of their appearance has resulted in the following actions:

1. All three emergency tiiesel generators have been placed under the responsibility of a f ngle i A^ssistant General Supervisor in our Nyclear Mair.tenance Department. An experlenced diesel mechanic has l>een assigned to inspect and maintain all of the diesel generators. Assigning the responsibility for maintenance of the diesel generatcrs to one maintenance group will ensuro that the generic problems are more easily identified and corrected. ,

2. All emergency diesel generators will be steam cleaned and inspected foi leaks. Any leaks identified will be corrected and all three diesel generators will be repcinted. Tnis was done to No.11 cmergency diesel generator on February 15, 1986 and is expected to be completed for No.12 emergency diesel generator by March Ih 1936, and No. 21 emeigency diesel generator by April 15,1936.

3. The dedicated diesel rhechanic will be notified prior to any planned diesel generator runs, so be can observe dias'l e operatiom He will '

identify and correct any leaks that rpay be 'ound during operation.

4. A vendor recornmendation to rninirnize gasket weepage is being evaluated to determsae applicability to our operating conditio's. We are evaluating the reconimendation for rotating the engine over af ter shutdown to ehsure that any residual bil in the cylindets is expelled (rom the cylin&rs-snd not allowed to leak past tFs uppcr pistons out to the . exhaust manifoldt. Dis reccmme,idatic,i is undet review to determine effects nn overt:1 diesel genera'ort reliabiB2y ;nd personnel safety. This evaluatjon will be camp'ctfJ ny Juf.e 1,1986, fa An on-site System Engineer has been assigned to essist in researching sute-of-the-ert ga$ ket materials and bolting practices to eliminate the minor leaks characteristic of the F6irbanks-Morse opposed pistan diesal engine. This research ; vill be completed by June 1, U86. This System Engirie3.' also scView; industry and NRC infornsttlan on diesel generators for appliqability to our diesel opera:lan and iaalntenance practicess 6 The System iingineer has been cssigned to reviGw the pre- and pcst-ope;atiin checklists te verify that vendor requirements are incorp0 rated, as appropriate. This review will be cc npleted by June i,1986. .

ENCLOSURE (1) l REPLY TO NRC INSPECTION REPORT 50-317/85-30; 50-318/85-32 In respect to the possible jacket cooling system internal leakage, we are very aware of the potential for damage and share your concern. We will devote appropriate resources toward verifying and correcting the source of the leakage.

Although the diesels may externally appear worn or used, this has not affected their performance. All three emergency diesel generators exceed a start reliability of 95%

Furthermore, the vendor recommendations concerning periodic internal inspections and overhaul are rigidly followed to ensure their excellent performance is maintained.

We believe the above actions fully address the diesel generator concerns in the subject report.

Instrument and Control Technician Work Practices We recognize that the Instrument and Control Technician work practices are deficient in some areas. We have taken corrective action on this subject.

Reactor Coolant Pump Seal Our inspection of the most recently failed Reactor Coolant Pump (RCP) seal was performed by the Nuclear Maintenance Department with the System Engineec and RCP seal consultant. There were no indications of a failure that could be attributed to the assembly and installation of the RCP seal. The RCP seal vendor has reviewed all as-found conditions and has not been able to determine the root cause of the failure.

A RCP seal task force was established in December 1985 to enhance our previous efforts in improving maintenance, operation, and design of RCP seals. As part of their charter, the task force is reviewing the following areas:

1. All operation and maintenance procedures associated with the RCP seal;

2. The RCP seal overhaul work area and parts storage area;

3. State-of-the-art inspection and lapping equipment; and

4. Vendor technical training services for RCP seal assembly work practices, using the latest inspection and lapping equipment.

It is expected that the accepted task force recommendations will be implemented by October 1986.

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e ENCLOSURE (1)

REPLY TO NRC INSPECTION REPORT 50-317/85-30; 50-318/85-32

) Intake structure The intake structure has been given a high priority on the 1986 preservation schedule. A review of surface preparation and protective coating practices is being made to ensure that the best practices and materials are being used to withstand the corrosive saltwater

atmosphere found throughout the circulating water pump intake structure Furthermore, the circulating water pump motor air coolers are under engineering review for replace-ment due to their history of chronic saltwater leakage.

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