ML20150A795

Advises That Util Evaluated Remaining Tdi Vibration Issues. Info Re Tdi Emergency Diesel Generators Available for Review at Plant Listed.Addl Responses to Questions Encl

ML20150A795
Person / Time
Site:	Rancho Seco
Issue date:	03/04/1988
From:	Croley B SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F Office of Nuclear Reactor Regulation
References
AGM-TA-88-080, AGM-TA-88-80, NUDOCS 8803160044
Download: ML20150A795 (3)

Text

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9suunSACRAMENTO MUNICIPAL UTILITY DISTRICT C P. o. Box 15830. Sacramento CA 95852 1830,(910) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA HAR 0 41939 AGM/TA 88-080 U.S. Nuclear Regulatory Commission Attn: Frank J. Miraglia, Jr.

Associate Director for Projects 11555 Rockville Pike Rockville, MD 20852 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 TDI DIESEL INFORMATION

Dear Mr. Miraglia:

The District has evaluated the remaining TDI vibration issues.

The following information regarding the TDI emergency diesel generators is available for review at Rancho Seco.

o Turbocharcer Lubricatina Oil Drain Line Vibration Res411s -

This in included in Attachment 1 to Calculation Z-EGS-M2102.

o Fuel Oil Tubina Vibration Results - This is included in Attachment 1 to Calculation Z-EGS-M2102.

o EDI Technical Report on Lubricatina Oil Pinino Vibration Levels -This report is Attachment 2 to Calculation Z-EGS-M2102.

o Jacket Water Return Vibration Results - The results for the "A&B" TDI are the subject of Attachment 3 and Attachment 1, respectively, of Calculation Z-EGS-M2102.

o Exoskeleton Analysis - This analysis is the subject of Calculation Z-EGS-M2335.

o Turbocharcer Suecort Analysis - This analysis is the subject of Calculation Z-EGS-M2320.

8803160044 090304 PDR ADOCK 05000312 S PDR (503I \

RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald. CA 95638 9799.(209) 333 2935

Mr. Miraglia NAR 0 4 Igg 3 I AGM/TA 88-080 o Turbocharcer Lubricatina oil Drain Vibration Analysis - This analysis is the subject of Calculation Z-M2412.  :

o TDI Diesel Encine Jacket Water Return System Pinina Vibration Analysis - This analysis is the subject of Calculation Z-EGS-M2411 (acceptance of Duke Calculation 4086-1607.04-0017).

o TDI Emercancy Diesel Generator Jacket Water Return Pinina -

This analysis is the subject of Calculation Z-EGS-M2113 '

(acceptance of Duke Calculation 4086-1607.04-0004).

o Information on Holzer Method - This information is included in TDI document 81015-701.

l Attached to this letter are the responses to the request for l information questions provided in your February 10, 1988 letter.

Based on our evaluation, the above documentation and question i responses address the outstanding information necessary for your review.

l Please contact me if you have any questions. Members of your staff with questions requiring additional information or clarification may contact Steve L. Crunk at (209) 333-2935 extension 4913.

Sincerely, 1

• l B. G. Croley, Acti

! Assistant General anager, j Technical and Ad inistrative Services i

Attachment 1 cc: G. Kalman, NRC, Rockville A. D'Angelo, NRC, Rancho Seco J. B. Martin, NRC, Rockville I

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GCA 88-080 MAR 0 41980 ATTACHMENT Question 1 The calculation of the allowable vibration levels as determined by Duke Power utilizes screening velocity criteria of .9 in/sec pk for carbon steel and 1.8 in/sec pk for stainless steel. Provide the basis for these criteria.

Response 1 Since the NRC staff visit to Rancho Seco in December 1987, the District replaced the acceptance criteria to that described in ANSI /ASMS OM3-1982 "Requirements for Preoperational and Startup Initial Vibration Testing of Nuclear Power Plants Piping Systems."

Question 2a Provide the dynamic analyses for the final configuration of the lube oil system and the jacket water system subjected to diesel engine transient and steady state operation.

Question 2b Provide a comparison of calculated and measured velocities and displacements, and show that the maximum stresses are below the appropriate stress criteria on which the allowable peak velocities and displacements are based.

Rasponse 2a,b The analysis for the lube oil and jacket water systems are available in calculations Z-EGS-M2102 and Z-EGS-M2113.

Question 3 Provide a comparison of measured velocities and displacements in the modified configuration of the "A" diesel generator, with those shown in the baseline vibration surveys.

Response 3 The baseline vibration survey was founded on the acceleration limits proposed by the TDI clearing House. Since we have chosen to use the OM3-1982 criteria which are based on velocities and displacements, the two criteria are not directly comparable.

Question 4 Provide an evaluation for the root causes of the engine vibrations.

Response 4 The cause of each of the vibration problems is evaluated in the system calculations described in this letter or has been previously reviewed by the NRC. In the final vibration report (to be submitted after restart) a compilation of the vibration problems and their root cuases will be provided.