ML17346B054
| ML17346B054 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 05/09/1985 |
| From: | Lauben N NRC |
| To: | |
| Shared Package | |
| ML17346B050 | List: |
| References | |
| NUDOCS 8505290185 | |
| Download: ML17346B054 (4) | |
Text
SPECIAL REPORT NS-NRC-85-3025 ENCLOSURE SSE ON BART-A" COMPUTER COD" INPUT METHODOLOGY MODIFICATIOti Reference 1 is the acceptance copy of the topical report describing BART-A1.
The NRC s aff SER is included in that document.
BART-A" is used to calculate refiood hea
.ransfer during a large break LOCA.
Wes inghouse replaces the FLECHT correlation.
It This code, developed by is based on more mechanistic principles and is less empirical than FLE'CHT.
In general, the staff supports approaches such as used in BART-Al.
The purpose of this SS="R is to'ddress the change in input methodology for the BART compute",
code as reported to the Turkey Point Board on March 18, 1985.
In consideratior.
of that issue some changes are made in he Turkey Point SER (reference 2}.
In reference 3, the 'NRC staff was informed by Westinghouse Electric Corporation of an input me.hodology problem for,the BART compu er program.
BART is one of the proorams in the Westinohouse Emergency Core Cooling System (ECCS) evalua.ion model used to demonstrate compliance with 10 CFR 50.46 and Appendix K to 10 CFR 50.
8505290185 850516 PDR ADOCK 05000250 p
PDR Core inlet flooding rate (Vin} calculated as a function of time in the WREFLOOD computer code is used as input to the BART code.
However, only a limited nymber of Vin points are made available from WRFFLOOD.
During the first few seconds of he core reflooding transient, the change in Vin as a func ion of
- ime ls Os l amatory.
Therefore, using a limited number of points from M?=FLOOD di 'o. allo~
an accura e represen a ion of Vin or the integral of Pin used
- ev:
) in in Br'..=.T.
in partical he in:-."gral of Vin and consequently the water as t
o n hn as useo
)n tel'
~
Mes.inghouse modified the da-a transfer procedure so that good aa.cement now exists be ween MR"-FLOOD and BART.
The analysis procedure also instructs the analyst to assure hat for all times during reflood the integrated value of Vin used in BART is equal to or less than hat calculated by MR"-FLOOD.
A reanalysis of the Turkey Poin. Units 3 and 4 was performed using he new me-hodo1 o~<<.
We have reviewed 'he information submit ed by Mes.inghouse and find the new methodology satisfactory and meets the reouirements of Appendix K to 10 CFR 50.
An SER addressing th',s subject on a plan specific basis or Turkey Point Units 3 and 4 and other plan: speci ic SERs will be supplied for those plants that have referenced BART prior to this evaluation approving the modi ied data" transfer procedure on a aeneric basis.
Prln; pa I
Lauben
REFERENCES "A."..-A :
A Computer Co"e
-.he Best stimate Analysis of Reflood Transients, h'CAP-9561-P-A, March 1984.
7..
2.
Le ter to Robert E.
Uhing (FP8L) from Dan McDonald (HRC) on "Technical W
Specification Amendments to Support the Integrated Program for Vessel Flux Reduc ion and Operation with New Steam Generators,"
(Enclosure 3) dated December 23, 1983.
3.
Letter from E.
P.
- Rahe, (westinghouse) to D.
G. Eisenhut (HRC) on "BART-MREFLOOD Input Revision," dated March 22, 1985.