ML20093K990

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Submits Addl Info Re CESEC-III Code for Reload Core Analysis Methodology,Per 840511 Request.Code Applicable to Facility Due to Digital Simulation of C-E PWR NSSS
ML20093K990
Person / Time
Site: Fort Calhoun 
Issue date: 10/08/1984
From: Andrews R
OMAHA PUBLIC POWER DISTRICT
To: John Miller
Office of Nuclear Reactor Regulation
References
LIC-84-310, TAC-63937, TAC-63967, NUDOCS 8410180260
Download: ML20093K990 (2)


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Omaha Public Power District 1623 Harney Omaha Nebraska 68102 402/536-4000 October 8,1984 L IC-84-310 Mr. James R. Miller, Chief U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch No. 3 Washington, D.C.

20555

Reference:

Docket No. 50-285

Dear Mr. Miller:

Submittal of CESEC-III Code Topical Your letter of May 11, 1984, containing the staff's safety evaluation of the District's reload core analysis methodology report contains a request for the District to submit a topical report for the CESEC-III Code. The District has considered your request and submits the following infonnation.

The District's Transient and Accident Methods and Verification Topical Re-port, OPPD-NA-6303-P, references numerous CESEC topical reports which have been submitted to the NRC. Specifically, references 4.9 and 4.10 provided documentation of the CESEC-III code. The District believes that referencing a topical report, previously schmitted to the NRC, on our docket is equiva-lent to submitting the report itself. Therefore, it is the District's pos-ition that we have satisfied the intent of submitting a topical report on the CESEC-III Code.

It should be noted that the District neither owns nor leases the CESEC-III Code from Combustion Engineering (CE). Rather, the District utilizes a compiled version of the CESEC-III code on the CE computer systen.

It would be inappropriate for the District to directly submit the CESEC-III topical report since we are neither the authors of the topical report nor fully cognizant of the details contained in previous topical reports submit-ted by CE.

The staf f's safety evaluation of the District's transient and accident anal-1 ysis topical report requests the District demonstrate the applicability of the CESEC-III code to Fort Calhoun Station. This applicability is demon-strated by the fact that the CESEC code is a digital simulation of a CE (pressurized water reactor) Nuclear Steam Supply System (NSSS).

The CESEC-III code models primary system components and secondary system components.

The primary system components considered in the code include the reactor vessel, the reactor core, primary coolant loops,.he pressurizer, the steam puoiB88aan8%

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Mr. James R. Miller Octooer 8,1984 Page Two generators and the reactor coolant pumps. The secondary systen component mod-els include the secondary side of the steam generators, the main steam system, feedwater system and various steam control valves.

In addition, the program models some of the control and plant protective systems. The Fort Calhoun re-

actor is a typical CE NSSS.

It consists of a pressurized water reactor with two steam generators, four reactor coolant pumps, two hot legs and four cold legs. The Fort Calhoun reactor is nodalized in accordance with the schemes given in' Reference 4.9 of the OPPD Transient and Accident Methods and Verifica-tion Topical Report. The CESEC-III code was designed for the typical CE NSSS and since Fort Calhoun Station is a typical CE NSSS, the CESEC code is, in es-sence, designed for the class of NSSS's of which Fort Calhoun Station is a mem-ber.

In addition, the District's verification of the CESEC-III code demon-strates that the CESEC-III code can be properly applied to Fort Calhoun Sta-tion and can accurately simulate transients which occurred at the station.

The District believes that this provides adequate demonstration that the CESEC-III' code is applicable to Fort Calhoun Station.

Sincerely, R. L. Andrews Division Manager Nuclear Production RLA/JKG/rh-S cc:

LeBoeuf,-Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.

Washington, D.C.

20036 Mr. E. G. Tourigny, NRC Project Maneger Mr..L. A. Yandell, Senior Resident Inspector