ML20137Z917

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Responds to NRC 850923 Request for Addl Info Re 850828 Request for Tech Spec Change Supporting Diesel Generator Lube Oil Mod.Due to Extensive Changes to Lube Oil Sys & Seismic Analysis & Testing of piping,30-day Outage Required
ML20137Z917
Person / Time
Site: LaSalle Constellation icon.png
Issue date: 10/02/1985
From: Massin H
COMMONWEALTH EDISON CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
0719K, 719K, NUDOCS 8510080404
Download: ML20137Z917 (3)


Text

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R: ply to: Post Chicago, Office Box 767liknois Chicago, Illinois 60690 October 2, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

LaSalle County Station Unit 2 Proposed Amendment to Technical Specification for Facility Operating License NPF Diesel Generator Lube Oil Modification, Supplemental Information NRC Docket No. 50-374 -

Reference:

August 28, 1985 letter from H. L. Massin to H. R. Denton requesting Tech Spec Change to Support the Diesel Generator Lube Oil Mod.

Dear Mr. Denton:

This letter supplements our referenced request and is in response to a September 23, 1985 telecon between Messrs. T. Bournia, P. Kang and H.

Massin. The following questions and answers address the issues raised during the telephone call:

1. Question: Why does the diesel generator lube oil modification take thirty (30) days to complete?

Response: Extensive changes to the lube oil system are required for this modification. A 3 gpm pump, two low oil pressure alarm switches, and new lines must be added to this system, and several existing lines must be modified. The Station Construction Department, which is responsible for the installation, has estimated that this work will take 12 to 16 days to complete with two shifts per day.

Upon completion of the installation, the Architect-Engineer must perform a seismic analysis of the piping, and the station must perform numerous tests such as hydrostatic

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f H. R. Denton October 2, 1985 tests on the piping, detailed and functional tests of the lobe oil system with the diesel shutdown and running, and start and load tests on the diesel generator. The A/E estimates that the seismic analysis will take 7 to 11 days, and the station estimates that the testing will require 3 to 6 days to complete.

Based on the discussions in the previous paragraphs, the schedule for performing the work on each diesel is:

1. Installation 12-16 days
2. Slesmic analysis 7-11 days
3. Testing 3-6 days Total 22-33 oays Since we expect to encounter some problems during the installation and testing, we believe that a 30 day outage will be needed to complete this modification. A shorter schedule would not be realistic.
2. Question: Can LaSalle Unit 2 shutdown with only one operable ESF division?

Response: Only one low pressure ESF division (1 or 2) is needed to safely shut down the unit. If only ESF Div. 1 is operable, RHR Loop A, LPCS, ADS, and RCIC would be available. If only ESF Div. 2 is operable, RHR Loops B and C, ADS, and RCIC would be available.

ESF Div. 2 will always be available to the operating unit following a loss of offsite power because the diesel generator connected to this bus will not be taken out of service to install this modification while the unit is operating.

3. Question: Will LaSalle commit to testing 0 or 1A, 2A, 2B diesels at some intermediate time?

Response: The station commits to starting diesel generators 0 or 1A and 2A and 28 sometime during the 30 day period. We would start one diesel per day beginning at approximately the 14th day of the period. If the diesel failed to start properly, the appropriate Tech Spec actions would be taken.

e H. R. Denton October 2, 1985 Please direct any questions you may have concerning this matter to this office.

One signed original and ten (10) copies of this transmittal are provided for your use.

Very truly yours, H. L. Massin Nuclear Licensing Administrator 1m cc: Dr. A. Bournia - NRR Resident Inspector - LSCS 0719K