ML100820412
| ML100820412 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 03/23/2010 |
| From: | Joel Wiebe Watts Bar Special Projects Branch |
| To: | Arent G, Stockton R Tennessee Valley Authority |
| Wiebe, Joel NRR/DORL/WBSP, 415-6606 | |
| References | |
| Download: ML100820412 (2) | |
Text
From:
Wiebe, Joel Sent:
Tuesday, March 23, 2010 2:20 PM To:
'Ricky Stockton'; 'Gordon Arent'
Subject:
Preliminary RAI Questions - FSAR Section 2.5
- 1. The WBN-2 FSAR, page 2.5-89, contains an addition to the FSAR Section 2.5.4.2.2.9.4, Monitoring Program for Differential Movement. The last sentence in this addition states that TVA had determined that differential settlement was no longer required at WBN based on an internal TVA memo on settlement stations dated February 6, 1984, and the TVA Calculation No. WCG-1-861, Settlement Monitoring. TVA is requested to provide a copy its 1984 memo justifying its decision to discontinue the differential settlement monitoring. The basis for this request is the statement in FSAR Section 2.5.4.2.2.9.3 that the design value of 1-inch differential settlement between adjacent rock-supported structures was not incorporated into the design of piping and electrical components passing between adjacent rock-supported Category I structures. This confirmatory request is to verify the basis for TVAs determination to discontinue differential settlement monitoring referred to in the current FSAR Amendment 95.
- 2. Some corrections made on WBN-2 FSAR pages (pp) 2.5-150 through 2.5-251 are to fix previous entries in the FSAR, e.g., pp 2.5-165 through168 contain corrections of formulas for dynamic soil properties. TVA is requested to report the effect of all these corrections, with special attention given to the effect of the corrections related to the dynamic soil properties previously used in the soil-structure analysis / design.
- 3. As part of the Item 2 above, TVA is also requested to discuss the effect of corrections and additions made to laboratory test data pertaining to the Essential Raw Cooling Water (ERCW) Supply pipelines, as these soil investigations pertain to the issue of liquefaction of soils supporting these pipelines, which was an important topic discussed by the NRC and TVA at the time WBN Unit 1 was licensed.
- 4. The WBN-2 FSAR, pp 2.5-179, 180 and 181 (shown as Amendment 40), contain some apparent changes in Amendment 95.
- a. TVA is requested to indicate if these changes pertain to Amendment 40 or 95.
- b. If these entries do pertain to Amendment 40, confirm that these were reviewed and approved by NRC staff previously. If these entries are newly added in Amendment 95, TVA is requested to correct the amendment number and also provide the response requested in Item 2 above.
- 5. Similarly, FSAR pp 2.5-203 and 204 (shown as Amendment 63), also contain some apparent changes.
- a. Indicate if these changes pertain to Amendment 63 or 95.
- b. If these entries do pertain to Amendment 63, confirm that these were reviewed and approved by NRC staff previously. If these entries are newly added in Amendment 95, TVA is requested to correct the amendment number and also provide the response requested in Item 2 above.
E-mail Properties Mail Envelope Properties (F371D08C516DE74F81193E6D891DC4AF304B3F30B1)
Subject:
Preliminary RAI Questions - FSAR Section 2.5 Sent Date: 3/23/2010 2:19:53 PM Received Date: 3/23/2010 2:19:00 PM From: Wiebe, Joel Created By: Joel.Wiebe@nrc.gov Recipients:
RAStockton@tva.gov ('Ricky Stockton')
Tracking Status: None GArent@tva.gov ('Gordon Arent')
Tracking Status: None WBN2HearingFile.Resource@nrc.gov (WBN2HearingFile Resource)
Tracking Status: None Post Office:
HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 11668 3/23/2010 Options Expiration Date:
Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: