ML17321A870
| ML17321A870 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/26/1985 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML17321A869 | List: |
| References | |
| NUDOCS 8509030536 | |
| Download: ML17321A870 (3) | |
Text
SAFETY EVALUATION REPORT FOR D.
C.
COOK UNIT 1 LARGE BREAK LOCA RE-ANALYSIS USING BART-MREFLOOD In reference 1, the licensee submitted a
LOCA analysis for D.
C.
Cook Unit 1 to support the current technical specification value of Fq = 2..10.
This analysis used BART-MREFLOOD for thermal hydraulic analysis during the reflood phase of the LOCA.
The corrected and revised input methodology was used.
The worst case identified in reference 1 was the so-called Max SI case with Cd = 0.6.
No other break sizes, were presented for Max SI.
At the NRC's request, the licensee requested Mestinghouse to perform Max SI analyses for Cd = 0.4 and 0.8.
This was done and the results are as follows.
LOCA Analysis Results Max SI BREAK Cd 0.4 0.6 0.8 PCT F
2107 2154 2046 Thus it was confirmed that Cd=0.6 was the worst case.
The staff also questioned the impact on K(z) of using BART-MREFLOOD.
The licensee and Westinghouse reviewed "spot-check" analyses with BART-WREFLOOD for top-peaked cases and determined that the existing K(z) curves would not be adversely affected.
,(
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/5{)9()gO g5gg()3i5 gQQCH. O., "pgg~l'.'.
N ~
I
-2" Based on these results the staff finds the new analyses using BART-WREFLOOD to support an Fq = 2. 10 to be acceptable.
Dated:
August 26, 1985 Principal Contributor:
N. Eauben