ML101190041

Preliminary RAIs for Watts Bar Unit 2 FSAR Section 5.5.11

ML101190041
Person / Time
Site:	Watts Bar
Issue date:	04/28/2010
From:	Joel Wiebe Watts Bar Special Projects Branch
To:	Crouch B Tennessee Valley Authority
Wiebe, Joel NRR/DORL/WBSP, 415-6606
References
Download: ML101190041 (2)

Text

From: Wiebe, Joel Sent: Wednesday, April 28, 2010 5:16 PM To: Bill Crouch Cc: Tony Langley

Subject:

Preliminary RAIs for Watts Bar Unit 2 FSAR Section 5.5.11 RAI 5.5.11-01 Section 5.5.11 does not provide any information describing the design codes/standards/etc. for the pressurizer relief tank. A review of Tale 3.2-2, "Summary of Criteria - Mechanical System Components," finds the pressurizer relief tank listed on Page 1 of 18, which would be an acceptable place to provide the information. However, there is no information provided on the pressurizer relief tank line in the columns. It appears that the table columns are out of alignment with the listing of components in the first column.

The staff also notes that there is no information provided on the Pressurizer Safety Valves line.

Again, this appears to be because of the table column misalignment.

RAI 5.5.11-2 Section 5.5.11.3, Design Evaluation, states "The rupture disc on the relief tank have a" This is not clear in that "rupture disc.." indicates there is one rupture disc while "relief tank have" implies there is more than one rupture disc. It should be noted that the Unit 1 UFSAR contains the same words. NUREG-0847, Watts Bar Unit 1 and Unit 2 SER, Section 5.4.4 states "Tank overpressurization protection is provided by two rupture discs."

Clarify the number of rupture discs that are provided with the pressurizer relief tank.

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Preliminary RAIs for Watts Bar Unit 2 FSAR Section 5.5.11 Sent Date: 4/28/2010 5:15:57 PM Received Date: 4/28/2010 5:15:00 PM From: Wiebe, Joel Created By: Joel.Wiebe@nrc.gov Recipients:

WDCrouch@TVA.gov (Bill Crouch)

Tracking Status: None DTLangley@TVA.gov (Tony Langley)

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HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 8087 4/28/2010 Options Expiration Date:

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