ML20236E936

Forwards Response to 871008 Request for Clarification & Info Re Emergency Diesel Generator Review

ML20236E936
Person / Time
Site:	Rancho Seco
Issue date:	10/26/1987
From:	Croley B SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F NRC
References
DTS-87-092, DTS-87-92, TAC-63030, NUDOCS 8710300069
Download: ML20236E936 (3)

Text

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~~ ' SACRAMENTO MUNICIPAL UTILITY DISTRICT O P. O. Box 15830, Sacramento CA 95852-1830,(916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA l

October 26,-1987 DTS87-092 U.' S. Nuclear Regulatory Commission Attr.: Frank J. Miraglia, Jr.

Associate Director for Projects Philips Bldg.

7920 Norfolk Avenue Bethesda, MD 20014 DOCKET'50-312 RANCHO SECO NUCLEAR GENERATING STATION.

LICENSE NO. DPR-54 EMERGENCY DIESEL GENERATOR ADDITIONAL INFORMATION

Dear Mr. Miraglia:

Subsequent to the District's October 8,1987 letter, the staff requested further. clarification and information with respect to their Emergency Diesel Generator review. The attached questions and answers provide this information.

Please contact me if you have any questions. Members of your staff with questions requiring additional information or clarification may contact John Atwell at extension 4917.

Sincerely, Bob G. Croley Director, Technical Services Attachment cc:

G. Kalman, NRC, Bethesda A. D'Angelo, NRC, Rancho Seco

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l' RANCHO SECO NUCLEAR GENERATING STATION El 1444o Twin Cities Road, Herald, CA 95638 9799;(209) 333-2935

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QUESTIONS / RESPONSES i

QUESTION #1:

Could failure of non-safety instrument (air) tubing cause a loss of all system compressed air?

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RESPONSE

As currently designed, failure of the non-safety instrument

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air' tubing will eventually cause loss of all system compressed air within a period of 3 or more days. The loss of air from the receiver tank is restricted by a throttled needle valve.

The District is pursuing several options to assure an adequate i

supply of compressed air. As stated in the District's October 8,1987 (response #5) the air receivers are currently being tested and upon completion, the.results of the test and design changes will be provided to the NRC.

QUESTION #2:

Have the auxiliary skid mounted piping and components which have been designed to ANSI B31.1 been pressure tested per ASME Section III, Class 3.

RESPONSE

Hydrostatic-testing of auxiliary skid mounted piping and components was performed by the vendor to ANSI B31.1 requirements.

QUESTION #3:

What is the status of the turbocharger permanent fix?

(i.e.,

Installed, tested, approved by TDI/0wners Group)

RESPONSE

The' turbocharger vibration problem has not yet been resolved nor have all supports been installed or tested.

However, the modification will be performed prior to restart. After restart the TDI vendor and owners group will be asked to review the modifications and provide their concurrence.

It should be noted that some members of the owners group are actively participating in designing the Rancho Seco modi fications.

QUESTION #4:

How does the communication system in the NSEB compare to that found in the Diesel Building.

RESPONSE

The communications in the NSEB is similar to that in the EDG Building.

Both buildings have equal types of communication devices such as telephones public address speakers and sound-powered phones.

Certain tiB rooms that contain equipment requiring periodic maintenance or operation actions are provided with at least two of the communication devices.

In the event of failure of these communication devices, UHF radio communications are available to plant personnel as backup.

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-. QUESTION. #5i,

Lighting PostLSeismic: Event:

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Battery l lighting seismically' qualified? ~

i AC' Lighting'available post seismic?-

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'or.,is-other means to be; provide'd?'-

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-RESPONSE:

The! battery powered lighting has been seismically supported' though'the fixtures have no seismic documentation. With-

. respect.to ~the AC lighting.no battery backup. exists and the -

~ lighting.is not seismically installed.

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