ML031400506

Ltr RELAP5/MOD3.3 Prediction and Model Simulation

ML031400506
Person / Time
Site:	Fort Calhoun
Issue date:	05/20/2003
From:	Wang A NRC/NRR/DLPM/LPD4
To:	Ridenoure R Omaha Public Power District
Wang A, NRR/DLPM, 415-1445
Shared Package
ml031400602	List: ML031400506 ML031410096 ML031410107 ML031410212
References
TAC MB6468
Download: ML031400506 (3)

Text

May 20, 2003 Mr. R. T. Ridenoure Division Manager - Nuclear Operations Omaha Public Power District Fort Calhoun Station FC-2-4 Adm.

P.O. Box 550 Fort Calhoun, NE 68023-0550

SUBJECT:

FORT CALHOUN STATION - RELAP5/MOD3.3 PREDICTION AND MODEL SIMULATION (TAC NO. MB6468)

Dear Mr. Ridenoure:

By letter dated October 8, 2002, Omaha Public Power District (OPPD), requested approval of the revised low-temperature overpressure protection (LTOP) analysis for the Fort Calhoun Station, Unit 1 (FCS). On April 23, 2003, the NRC staff and OPPD held a conference call to discuss the revised LTOP methodology. The staff stated that it would be useful if OPPD could validate its LTOP models. The staff agreed to provide OPPD several references which would assist in this effort. Enclosed are: (1) a MIT Thesis, "Insurge Pressure Response and Heat Transfer for PWR Pressurizer," (2) a short description of the RELAP5/MOD3.3 prediction and model simulation from the RELAP5 Developmental Report, and (3) a listing of the RELAP5 input model for the Test ST4. The thesis contains relevant data to allow OPPD to validate the LTOP models. Note that the RELAP5 prediction of ST4 underpredicts the pressure data due to the lack on nodalization detail in the RELAP5 model. The surge tank was modeled with 10 cells which was determined to be insufficient.

If you have any questions, please contact me at (301) 415-1445.

Sincerely,

/RA/

Alan B. Wang, Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-285

Enclosures:

1. MIT Thesis

2. Description/Model Simulation

3. Listing cc: See next page

ML031400506 NRR-088 OFFICE PDIV-2/PM PDIV-2/LA PDIV-2/SC NAME AWang EPeyton SDembek DATE 5/13/03 5/13/03 5/13/03 DOCUMENT NAME: G:\PDIV-2\FortCalhoun\mb6468ltoprai.wpd Ft. Calhoun Station, Unit 1 cc:

Winston & Strawn Mr. Daniel K. McGhee ATTN: James R. Curtiss, Esq. Bureau of Radiological Health 1400 L Street, N.W. Iowa Department of Public Health Washington, DC 20005-3502 401 SW 7th Street, Suite D Des Moines, IA 50309 Chairman Washington County Board of Supervisors Mr. Richard P. Clemens P.O. Box 466 Division Manager - Nuclear Assessments Blair, NE 68008 Omaha Public Power District Fort Calhoun Station Mr. John Kramer, Resident Inspector P.O. Box 550 U.S. Nuclear Regulatory Commission Fort Calhoun, NE 68023-0550 P.O. Box 310 Fort Calhoun, NE 68023 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Ms. Sue Semerera, Section Administrator Nebraska Health and Human Services Systems Division of Public Health Assurance Consumer Services Section 301 Cententiall Mall, South P.O. Box 95007 Lincoln, NE 68509-5007 Mr. David J. Bannister, Manager Fort Calhoun Station Omaha Public Power District Fort Calhoun Station FC-1-1 Plant P.O. Box 550 Fort Calhoun, NE 68023-0550 Mr. John B. Herman Manager - Nuclear Licensing Omaha Public Power District Fort Calhoun Station FC-2-4 Adm.

P.O. Box 550 Fort Calhoun, NE 68023-0550