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ACRS Thermo-Hydraulic Phenomena Subcommittee Meeting - August 22-23, 2001

ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
THERMAL-HYDRAULIC PHENOMENA SUBCOMMITTEE MEETING:
GE NUCLEAR ENERGY TRACG CODE APPLICATION TO AOO's,
EPRI REPORT- RESOLUTION OF GL96-06 WATERHAMMER ISSUES
AUGUST 22-23, 2001
ROCKVILLE, MARYLAND

Contact: P. Boehnert (301-415-8065 "pab2@nrc.gov")

PRESENTATION SCHEDULE

August 22, 2001

TOPIC SPEAKER TIME
I. Reconvene/Opening Remarks T. Kress,
Acting Chairman
8:30 a.m.
II. GE Nuclear Energy TRACG Code for Anticipated Operational Occurrences        
   A. NRC Staff Presentation (Open) R. Landry, NRR 8:45 a.m.
      1. Introduction and Background
      2. Safety Evaluation Report
               - Review Scope
               - Methodology
               - Lessons Learned from Exercise Of GE TRACG Code
               - Review of Uncertainty Evaluation
               - Results and Conditions (if any)
               - Conclusions
      3. Concluding Remarks

   B. GE Nuclear Energy Presentation (Open/Closed?)    12:30 p.m.
      1. Introduction J. Andersen, GNF,et al.   
      2. Response to Subcommittee      
         Comments (11/13-14/00 Mtg.)
Regarding the TRACG Code
Correlations & Models (see list - below)
      3. Comment on NRC TRACG SBWR Review
      4. Concluding Remarks

III. Subcommittee Caucus (Open)     4:00 p.m.
      1. Comments on Meeting Presentations      
      2. Follow-on Actions      
      3. Decision to Bring Review to ACRS

    
IV. Recess     4:30 p.m.


Comments on TRACG Code Models/Correlations -
November 13-14, 2000 ACRS T/H Phenomena Subcommittee Meeting
         
  • The momentum equations do not appear to properly account for Reynolds stress.
  • The origin of the equations are not clearly specified pursuant to the regulatory position in the draft regulatory guide on code submittals.
  • Partition of wall shear stress in not treated consistently in the documentation
  • The modeling of Tee components is not clearly explained and its adequacy is not apparent.
  • There is no definitive modeling of flow regime transition, and the logic of this modeling is not clear.
  • Regarding the interfacial shear model, key terms in the equations are not explained, in particular the relationship between the "ci" and "c0" terms needs to be clarified.
  • GE has an inconsistent treatment for modeling of interfacial area and the heat transfer coefficients.

 

August 23, 2001

V. Reconvene/Opening Remarks T. Kress,
Acting Chairman
8:30 a.m.
VI. Resolution of GL 96-06 Waterhammer Issues (Open /Closed)        
   A. NRC/Industry Resolution Approach (ePRI Study)- Summary

J. Tatum NRR/DSSA/SPLB 8:45 a.m.
   B. Revised EPRI Report - Evaluation of GL 96-06 Waterhammer Issues and Resolution of Comments From 1.16-17/01 Subcommittee Meeting

V. Wagoner (CP&L)
A. Singh (EPRI)
T. Esselman (Altran)
9:00 a.m.
   C. NRC Review of EPRI Report - Results, Open Issues, Resolution Approach and Conclusions

J. Tatum
11:30 p.m.
   D. Concluding Remarks

EPRI/NRC 12:30 p.m.
VII. Subcommittee Caucus (Open)   12:45 p.m.
      1. Comments on Meeting Presentations      
      2. Follow-on Actions      
      3. Decision to Bring Review to ACRS

     
VIII. Recess   1:00 p.m.
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