ML042010318

E-Mail, Prairie Island, Request for Additional Information, LAR - 3/25/04 - Main Steam Line Mass & Energy Release Using BAW-10169-A

ML042010318
Person / Time
Site:	Prairie Island
Issue date:	05/13/2004
From:	Mahesh Chawla NRC/NRR/DLPM/LPD3
To:	Vincent D Nuclear Management Co
Chawla M, NRR/DLPM, 415-8371
References
Download: ML042010318 (2)

Text

From: Mahesh Chawla To: Dale.Vincent@nmcco.com Date: 5/13/04 10:18AM

Subject:

Prairie Island - Units 1& 2- LAR - 3/25/04 - Main Steam Line Mass & Energy release using BAW-10169-A In reference to the above submittal, NRC staff has following questions which they would like to discuss with you. Please indicate your availability to have a teleconference with the staff.

1. Page 5. Explain the choice of 0.6 ft2 for the lower bound break size for the sensitivity study.

Are split breaks considered?

2. Verify that both cases with and without loss of offsite power will be considered to determine the limiting case.

3. Describe or provide a reference for the treatment of entrainment in the break flow. Was this included in the core response calculations?

4. Page 5. The statement is made that liquid inventory is maximized. But this corresponds to zero power. How is this consistent with sensitivity study to select limiting power?

5. Page 5. Why isnt a single failure of the auxiliary feedwater automatic run-out protection analyzed?

6. Page 5. Is the description of the modeling of the steam system consistent with the current licensing basis?

CC: Richard Lobel Mail Envelope Properties (40A38399.D8D : 15 : 21352)

Subject:

Prairie Island - Units 1& 2- LAR - 3/25/04 - Main Steam Line Mass &

Energy release using BAW-10169-A Creation Date: 5/13/04 10:18AM From: Mahesh Chawla Created By: MLC@nrc.gov Recipients Action Date & Time nmcco.com Transferred 05/13/04 10:18AM Dale.Vincent (Dale.Vincent@nmcco.com) nrc.gov owf2_po.OWFN_DO Delivered 05/13/04 10:18AM RML CC (Richard Lobel)

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