ML101340589
| ML101340589 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 05/12/2010 |
| From: | Bajestani M Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| TAC MD8203 | |
| Download: ML101340589 (8) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Spring City, TN 37381-2000 May 12, 2010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391
Subject:
Watts Bar Nuclear Plant (WBN) Unit 2 - Response to U.S. Nuclear Regulatory Commission (NRC) Request for Additional Information Regarding Environmental Review (TAC No. MD8203)
The purpose of this letter is to provide additional information in support of NRC's environmental review of WBN Unit 2 as requested by the NRC in Reference 1 subsequent to a site audit in October 2009.
The WBN Unit 2 Final Supplemental Environmental Impact Statement (June 2007) was submitted to the NRC on February 15, 2008 (Reference 2). By letter dated July 2, 2008 (Reference 3), TVA responded to an NRC request for additional information. By letter dated January 27, 2009 (Reference 4), TVA provided the Severe Accident Management Alternatives analysis report for WBN Unit 2. By letters dated December 23, 2009 (Reference 5), February 25, 2010 (Reference 6), and April 9, 2010 (Reference 7), TVA provided additional information in support of NRC's environmental review of WBN Unit 2.
The enclosure provides the NRC environmental review request for additional information and TVA's response. There are no regulatory commitments associated with this submittal.
If you have any questions, please contact me at (423) 365-2351.
Sincerely, Masoud B j tani Watts Bar it 2 Vice President Printed on recycled paper
U.S. Nuclear Regulatory Commission Page 2 May 12, 2010
References:
- 1. NRC letter to TVA dated December 3, 2009, 'Watts Bar Nuclear Plant, Unit 2 -
Request for Additional Information Regarding Environmental Review (TAC No.
MD8203)" [ML093030148 / ML093290073]
- Final Supplemental Environmental Impact Statement for the Completion and Operation of Unit 2" [ML080510469]
Final Supplemental Environmental Impact Statement - Request for Additional Information (TAC MD8203)" [ML081850460]
Final Supplemental Environmental Impact Statement - Severe Accident Management Alternatives (TAC MD8203)" [ML090360588]
- Additional Information Regarding Environmental Review (TAC No. MD8203)"
[ML100210350]
- Additional Information Regarding Environmental Review (TAC No. MD8203)"
[ML100630115]
Response to U.S. Nuclear Regulatory Commission (NRC) Request for Additional Information Regarding Environmental Review (TAC No. MD8203)"
Enclosure:
- 1. Response to NRC Request for Additional Information Regarding Environmental Review Attachments to
Enclosure:
- 1. TVA Watts Bar Nuclear Plant Flow Diagram for Dual Unit Operation
- 2. Watts Bar Nuclear Plant - Flows Associated with NPDES Flow Diagram for Dual Unit Operations (includes update to Table on page 3-3 of the 1978 EIS for dual unit operation)
U.S. Nuclear Regulatory Commission Page 3 May 12, 2010 cc (Enclosure):
U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, GA 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381
Enclosure Response to NRC Request for Additional Information Regarding Environmental Review Tennessee Valley Authority Watts Bar Nuclear Plant - Unit 2, Docket No. 50-391 Hydrolopy H-16 NRC Request The figure included in Appendix B of the 2007 TVA EIS shows water flow rates for plant systems with one unit in operation. Provide an update of this figure showing the flow rates for the system with WNB Unit 1 and 2 in operation.
Provide an update to the table on page 3-3 of 1978 EIS to include values that include the flow rates needed for both units in operation.
TVA Response to this enclosure is "TVA Watts Bar Nuclear Plant Flow Diagram for Dual Unit Operation," which is an update to the figure that was included in Appendix B of the 2007 TVA Environmental Impact Statement (EIS) showing the water flow rates for plant systems with one unit in operation. This updated figure shows the water flow rates for plant systems with WBN Units 1 and 2 in normal power generation mode. The flow rates listed in the flow schematic are in million gallons per day (mgd). The updated flow diagram for dual unit operation was developed using the Unit 1 flow diagram from NPDES Permit No. TN0020168 (pending), March 2009. This flow diagram also updates Supplemental Condenser Cooling Water (SCCW) discharge, which is based on the Condenser Cooling Water System hydraulic model for cooling tower basin study. The flow split between SCCW discharge and the cooling tower blowdown are rebalanced or estimated based on the design basis and functions of the Unit 2 systems supporting dual unit operation. of this enclosure is the 'Watts Bar Nuclear Plant -Flows Associated with NPDES Flow Diagram for Dual Unit Operations," which includes the update to the Table on page 3-3 of the 1978 EIS for dual unit operation. The plant water flow rates provided in Attachment 2 are based on the "Flows Associated with NPDES Flow Diagram for Dual Unit Operation (as shown in ) for TVA Watts Bar Nuclear Plant." A number of flow rates listed on the 1978 Table were deleted since they are no longer shown on the NPDES (Permit No.TN0020168) Flow Schematic diagram for 2009 and Attachment 1.
Only the flow rates for dual unit operation at normal power generation mode are provided.
El-I TVA Watts Bar Nuclear Plant Flow Diagram for Dual Unit Operation
"A - Airmat e F1,w Path OOW
-Cottdense Cootvg water Cr-Cotting To.nw E -Etteparatice ERcO - Ehrheney Raw CoOing wate HpFP-High Presu, Fe Proectio Systeo MWS - Mu nicpal water Suppry P - Ptaupvtrvn RCW
- Raw Coig Wate RSW - Raw Sen~kce Wat.
SCOW
- Supemerental cOw SGBD Stem enert Bk.
S owh TeSs - Trae eOd~ldig S-alor Sung TO - Trenirio Center V-d Wat, Trh-e Plant wP - wa-TrhtentPlant KEY
-p Intermittent Flow
-- > Chemical Additive M Normally open valve
- h4 Normally closed valve n
Negligible flow SCCW S..n Back Wash 0IS" 114 10.019 Walts eon Reservoir (Tonnesoee River)
N ass Ut.Mai Candanr 411t1 C, Basin 2isr N ;14.195 I
419 686 J1 T Bas' 821.82 112~ lan CTBain g
697.1 11 Man2onene Recirculating cooling water I
/I~I 21..2 1
6-97.174
(.........
Notes:
- 1. Both units are operating in normal power generation mode.
- 2. Raw water additives will be used in the Intake Pumping Station and the Cooling Tower Basins.
- 3. For dual unit operation, two essential raw cooling water (ERCW) pumps and six raw cooling water (RCW) pumps are operating with a total maximum flow rate of 52,100 GPM (75.024 MGD).
- 4. The flows through Ice Condenser chiller packages and various air coolers are doubled from Unit I Only Operation. The ERCW, and RCW discharge rates were ratioed by 21% to balance the flow diagram.
References:
- 1. N3-67-4002. R25, ERCW System Description.
- 2. Calculation No. MDN00002720100373 RO.
I I
45773 J-t I
F Wait.e Bar Reservoir 0.61
//
(Tennessee River)
..... 019 -6 3.g381
, 0.0,_ A Once Thhigh Cocking; waler Dischag 57.7 Chicknrmauga 75.024 ERCW isvharge15.31)(N 4 I1.3ro Reservior 5 e1 3 74.551 RCW Oevrhrge (4.91 I (1 I 4)
Peroess Waler via IPS
..a 0.285 Raw Water 0.00' Cgr I
I I
- ~n o.*.
t-h"......... 1
[*
1-1 vwrP RO RejectI Doatnge S
Tras.
slui Sluate 0.1rrBL og PCeOW T
aslto Oeaee Book1 Weano 0.087 Sum WseIMe8 CROW h Snls te g" L
WI V
R Rjc Staten.01 0r.009vpe0.7 Yard 8.18780.1 678 Hodking Pond l
C lIng Tower Blon Don Liquid Radssaste Systo 0.0040 Primary La horaory Waste cOwlI) 0S36 Redooaoev eaFor B Equipment Drains, Tanks, e
da arynd N, 1000391 I;ýn
'Ar "
g.0716 Condensae Detain Cleanup
..I clashing We.-"........
....... t.......
Laboator....te 0.0002 *=
NeutraIWaste Tank h
MINS L
Ie 0.00 System Leakage & Maintan-n.3 I99 on Through Cooling Water 0S001 (ERCW
& RCW System Main HPFP Oystem Fee B n-ar Ss tems R5OW Osom WW CleingWw-deabl)
F dng (outage)
Io n
to CT oleae oSWeunRo l1a0.00011 Work eagn Cm*n oRming (0.00M 1 Isets IMP 107 Eli!
nlined Pond 03 Ioo N-Rad Demin Water (0.011)
Sow*ia Building Sump (0.020)
DieSel Gen (DIG) Building Sump (00001o )
oI Emrgency DID Building Sump (0.0001) on CoW Pump Staton Sump (0.0001) mNaOCI BuildingSump & Dike 10.001) m HPFP System Floses 10.0031 0,7373 Potable Water Line Leaks (0.001) mso.e Water Runoff (0.699)
Chemical Storage Rainwater Release (0.001)
Groundwater Sump (0.001) 0.057 TVA Watts Bar Nuclear Plant NPDES Flow Diagram for Dual Unit Operation All Flows in MGD Turbi Buildi Steti Sum Watts Bar Nuclear Plant Flows Associated with NPDES Flow Diagram for Dual Unit Operations (includes update to table on page 3-3 of the 1978 EIS for dual unit operation)
Watts Bar Nuclear Plant Flows Associated with NPDES Flow Diagram for Dual Unit Operations Flow Location Flow-Normal Full Load Operation of Two Units Intake 75.024 mgd or 52,100 gpm Strainer Backwash 0.108 mgd or 75 gpm Screen Backwash 0.0078 mgd 6 gpm Essential Raw Cooling Water 30.96 mgd or 21,500 gpm Raw Cooling Water System 44.064 mgd or 30,600 gpm Cooling Tower Evaporation Rate 2 (21.82 mgd) = 43.64 mgd or 30,305 gpm Cooling Tower Blowdown Rate 45.408 mgd or 31,533 gpm Condenser Circulating Water 2 (590.4 mgd) or 820,000 gpm System (Flow through Towers)
Water Treatment Plant Supply 0.285 mgd or 198 gpm Steam Generator Blowdown 0.36 mgd or 250 gpm (Alternate)
Holding Pond Discharge 1.369 mgd or 951 gpm Radioactive Liquid Treatment 0.0039 mgd or 3 gpm System Discharge Plant Discharge 57.75 mgd or 40,104 gpm Supplemental Condenser 148.895 mgd or 103,399 gpm Cooling Water Discharge