ML20196L188

Non-proprietary Rev 1 to DPC-NE-3004, Mass & Energy Release & Containment Response Methodology

ML20196L188
Person / Time
Site:	Mcguire, Catawba, McGuire
Issue date:	05/31/1999
From:	DUKE POWER CO.
To:
Shared Package
ML20137R188	List: ML20196L185 ML20196L188
References
DPC-NE-3004, DPC-NE-3004-R01, DPC-NE-3004-R1, NUDOCS 9905270161
Download: ML20196L188 (7)

Text

1

, j Attachment 1 Duke Power Company McGuire Nuclear Station Catawba Nuclear Station MASS AND ENERGY RELEASE AND CONTAINMENT RESPONSE METHODOLOGY DPC-NE-30(M Revision i May 1999 i

Nuclear Engineering Division Nuclear Generation Department Duke Power Company 9905270161 990520 PDR ADOCK 05000369 '

P pon

)

( -

l .

Table of Contents (cont.)

1 Appendix A - GOTHIC Ice Condenser Model With Finer Nodalization l

I I

viii

6.5-l '

CNS-12.4 ft 2MSLB Average Lower Containment Temperature 6.5-2 CNS-12.4 ft 2MSLB Break Compartment Temperature 6.5-3 CNS-12.4 ft: MSLB Average Lower Containment Pressure 6.5-4 CNS-12.4 ft 2MSLB Ice Mass Melted A-1 Revised GOTHIC Containment Model Nodalization l

l l

l l

l xxi l L:

Cpre Cooling Systems, the Auxiliary Feedwater System, the Containment Spray Systems, the Containment Air Return Fan System, the Component Cooling Water System, the Nuclear Service Water System, and the ice condenser and containment. The modeling of the actuation, alignment, and automatic or manual control of these systems is described in the report. Potential revisions to the Technical Specification limiting conditions for operation, and the control and operation of these systems in the station emergency operating procedures will be based on analyses using the methods described in this report.

Chapter 2 describes the three computer codes comprising the methodology, the simulation models, and validation of the code and models. Chapter 3 describes the mass and energy release methods, assumptions, and results for LOCA using RELAP5 MOD 3. Chapter 4 describes the mass and energy release assumptions and results for steam line breaks using RETRAN-02.

Chapter 5 describes the LOCA containment response assumptions and results using GOTHIC.

Chapter 6 describes the SLB containment response assumptions and results using GOTHIC.

Chapter 7 provides a brief summary.

The guidance provided in the Standard Review Plan Section 6.2 (Reference 1-8), Regulatory Guide 1.89 (Reference 1-9), and ANSI /ANS-56.4-1983 (Reference 1-10) was considered in the development of the methodology in this report. It is noted that the ice condenser containment design is not thoroughly addressed by these references.

Reference 1 11 described the Duke Power methodology for analyzing the mass and energy releases and containment responses for a B&W design PWR with a dry containment design.

That methodology is similar in that a version of the RELAP5 code, a sister code (FATHOMS / DUKE) to the GOTHIC code, and the RETRAN-02 code are the main components of the methodology. This report builds on that work and extends the methodology to the Westinghouse NSSS with an ice condenser containment design.

l Appendix A describes a revision to the GOTHIC simulation model for finer nodalization detail l

within the ice condenser region. This increased detail allows the modeling of various regions l- within the ice condenser with different initial ice weights. There are no changes to the basic l thermal-hydraulic behavior of the model which are introduced by the increased detail within the ice condenser region.

l-3

Appendix A GOTHIC Ice Condenser Model With Finer Nodalization For the purpose of analyzing a non-uniform initial ice mass distribution within a subset of the ice baskets, a revised GOTHIC ice condenser containment model is developed with a finer nodalization in the ice condenser region.

The nodalization of the ice condenser for the existing model, as described in Section 2.3.2 of the main body of this report,is l

l It is desired to nodalize the ice condenser with different ice weights in various regions. This may be accomplished by finer nodalization in the I

1 l

A-1

g . . ,

i l

f 1

I

~

)There are no modeling changes introduced as a result of the finer nodalization

~

which would alter the basic thermal-hydraulic behavior of the model.

A-2

r Figure A-1 l

l l

)

l l

1 l

l I

i l

l l

I i

Revised GOTHIC Containment Model Nodalization A-3