ML20198L706

Flow Diagram of Main Steam to Aux Equipment (SA) Main Steam Bypass to Condenser (Sb), as-built

ML20198L706
Person / Time
Site:	Catawba
Issue date:	07/08/1985
From:	DUKE POWER CO.
To:
Shared Package
ML20137Q237	List: ML20198L706 ML20266A079 ML20266A085 ML20266A089 ML20266A095 ML20266A098 ML20266A117 ML20266A120 ML20266A125 ML20266A131 ML20266A135 ML20266A140 ML20266A144 ML20266A149 ML20266A154 ML20266A157 ML20266A164 ML20266A168 ML20266A173 ML20266A176 ML20266A181 ML20266A186 ML20266A190 ML20266A194 ML20266A199 ML20266A203 ML20266A206 ML20266A211 ML20266A216 ML20266A220 ML20266A226 ML20266A230 ML20266A235 ML20266A239 ML20266A243 ML20266A246 ML20266A250 ML20266A255 ML20266A258 ML20266A263 ML20266A269 ML20266A273
References
CN-1593-1.1, NUDOCS 8602100240
Download: ML20198L706 (1)

Text

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PAC I F I C G-AS AND E LE C T R.I C COMPANY -

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Mr. Karl R. Goller g . -r ; / g Assistant Director for kb' C Operating Reactors Y Division of Operating Reactors 6 , f}, f,//g U. S. Nuclear Regulatory Commission 3 jf';M, ,

(id) -g p/'t'J 4 Washington, D. C. 20555

$. -u Re: Docket No. 50-133  % h;:g%8r.~ m,Ml -

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Dear Mr..Goller:

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This letter is to confirm agreements reached with your Staff concerning (1) the program of additional geologic and scismic investigations in. the vicinity of our Humboldt Day Power Plant, which will be completed over the next several months, (2) the scopo of the seismic design upgrading program for the Plant in order to meet cur-rent regulatory requirements, which is planned for completion during

.g. the Summer-Fall 1976- Unit No. 3 refueling, maintenance, and modifica-l tion outage, and (3) the planned outago s'chedule and requirements for return of the Unit to service. These matters have been discussed in detail with various members of the Regulatory Staff in a series of meetings held on April 20, 21, and 28, 1976.

Attachment I (40 copics enclosed) consists of a report which describes the objectives and details of the program for additional geologic and scismic investigations. It is our intent to complete this work prior to the return of Unit No. 3 to service following the Summer-Fall 1976 outage with the exception of one item noted in the report.

This item, which involves investigations in Table Bluff and Bayside Cutoff-Freshwater Crock Areas, will be completed by the end of 1976.

The report describes the mechanism by which the Regulatory Staff will be kept apprised of the progress of this work and the planned schedule for submission of reports on these investigations.

Attachment II (40 copics enclos,.d) is a summary report de-scribing in detail those Humboldt Bay Power Plant structures, systems-and components which arc addressed by our current seismic design up-grading program and have been classified as Sc'ismic Category I based S

eg 5o21@1o240antain' g $-665 PDR -

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Mr. Karl R. Goller 2 ,- May'll, 1976 on Regula' tory Guide 1.29. In addition, those portions $f[ structures, -

systems and components whose continued function is not required but whose failure could reduce the functioning of Seismic Category I .

plant features are describcd in Attachment II. All of the structures, systems and components listed in Attachment II have or will be qualified by analysis and/or testing, modified or replaced as required to mect current regulatory requirements with respect to withstanding the effects of both the agreed upon OBE of 0.25 g and, in addition, an assumed SSE of 0.50 g. It should be noted that most of the major modifications that will be required are in progress at this time. The Regulatory Staff will_bc kept informed of the status of this work as it progresses.  !

- The Summer-Fall 1976 refueling, maintenanco and modification outage. will begin with a controlled shutdoun of the Unit commencing on the night of July 2, 1976. This is consistent with our normal practice of beginning an outage following the Friday cvening peak load rcquire-ments. The present expected return to servico dato is November 1. As agreed in our meeting of April 28, Commission concurrence with respect to the satisfactory completion of the geologic and seismic investigation program (Attachment I) and the current scismic design upgrading program for tho Plant (Attachment II) will be required prior to the time the Unit is returned to power operation.

Kindly acknowledge roccipt of the above material on the on- -

closed copy of this letter and return it to me in the onclosed addressed envelope.

Very truly yours, D _

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Enclosure and Attachments e

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