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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 "c_i" 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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