ML061770075

VYNPS Cooling Tower Noise Study, 2005

ML061770075
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png (DPR-028)
Issue date:	06/14/2005
From:	Yasi D Stone & Webster
To:	Nichols C Entergy Nuclear Vermont Yankee, Office of Nuclear Reactor Regulation
References
%dam200610, 4500523764, SCN 59029, VY 2005-0313, WBS:23750
Download: ML061770075 (13)

Text

aw Stone & Webster, Inc.

Stone & Webster, Inc.

100 Technology Center Drive Stoughton, MA 02072-4705 617.589.1120 Fax: 617.589.2969 Mr. Craig Nichols Entergy Nuclear Vermont Yankee 320 Governor Hunt Road Vernon, VT 05354-9766 June 14, 2005 WBS: 23750 VY 2005-0313

SUBJECT:

ENTERGY / VY EPU PROJECT - PURCHASE ORDER NO. 4500523764 SCN 59029-050 TRANSMITTAL OF FINAL COOLING TOWER PRE & POST MODIFICATION NOISE TEST REPORT VERMONT YANKEE NUCLEAR POWER STATION Dear Mr. Nichols; Please find the attached FINAL Cooling Tower Pre & Post Modification Noise Test Report for Entergy acceptance. Entergy comments have been incorporated.

If you have any questions, please contact me at 617 589-1120.

Sincerely, Dan Yasi Project Manager enc Cc: M. Powers G. Thomas A Shaw Group Company

dbEntergy EXTENDED POWER UPRATE COOLING TOWER PRE & POST MODIFICATION NOISE TEST REPORT for VERMONT YANKEE NUCLEAR POWER STATION Prepared for Entergy Nuclear Vermont Yankee, LLC 59029-RPT-05-001 VY P.O. 4500523764, SCN 59029-050 June 2005

-Pirel rer

-Zate ProjectM ger Date Prepared by ShawT1 Stone & Webster, Inc.

Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station TABLE OF CONTENTS 1.0 Purpose & Scope.........................................................................................................

2 2.0 Instruments.......................................................................................................................

2 3.0 Measurements..........................................................................................................

2 3.1 Baseline............................................................................................................................

4 3.2 Post Modification........................................................................................................

4 4.0 Analysis.............................................................................................................................

4 5.0 Conclusion........................................................................................................................

5 6.0 Attachments......................................................................................................................

6 6.1 Baseline Data Sound Level Measurement Data...........................................................

7 6.2 Post Modification Sound Level Measurement Data......................................................

8

Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station 1.0 PURPOSE & SCOPE The Vermont Yankee Nuclear Power Station (VYNPS) is performing a thermal up-rate to approximately 120% of the original NRC licensed power level. As a condition of their approval of the up-rate, the Vermont Public Service Board required replacing 21 of the 22 - 125 HP cooling tower motor/fan units with 200 HP units and replacing the 8-bladed fans with a 10-bladed design. One of the design criteria is that the motor/fan changes cannot increase the cooling tower sound levels by more than 1 dBA. Baseline and post-modification sound measurements were required to document the cooling tower operational sound levels. These sound level tests have been completed and the data analyzed. This report summarizes the two tests and presents the results.

2.0 INSTRUMENTS Baseline sound level measurements were made with a Svantek, model 949 (sn 6028) integrating sound level meter with a Larson Davis, model CAL-200, (sn 2425) acoustic calibrator. Post-modification sound level measurements used the same baseline instruments, with the addition of a Rion, model NA29E (sn 108810374) integrating sound level meter and a Bruel & Kjaer, model 4230, acoustic calibrator (sn 860801). All instruments meet the applicable American National Standards Institute (ANSI) or the International Electrotechnical Commission (IEC) requirements for Type 1 accuracy and have calibration certificates traceable to the National Institute of Standards and Technology (NIST).

The sound level meter was calibrated before and after the test periods with a 94 dB reference level at I kHz. Before, during and after each test all of the instruments functioned properly and required no adjustments. The sound level meter and microphone (with windscreen), mounted on a tripod, were positioned approximately 5-ft above the ground.

3.0 MEASUREMENTS Both sound level measurement tests were performed by Stephen Ambrose, a Noise Specialist with Shaw Environmental. The baseline test was observed by Daniel Yasi of Stone & Webster and the post-modification afternoon test was observed by Shailendra Chivate, a coop student with Entergy.

Prior to performing the sound test, each measurement location was pre-marked at 100-ft intervals from 200 to 500-ft from the nearest point on Cooling Tower 2 (CT2). Measurement distances were referenced to the louver sidewall (west) or solid end wall (south). The distance was also measured to the nearest residential property line to the southwest. It was not possible to measure in other directions because of significant obstructions or interferences, which included restricted access to protected power station areas, other power station noise sources, property fences and the Connecticut River. The measurement locations and related fenced or site property lines are shown on Figure 1.

"A-weighted" Leq (dBA) sound levels for each test were measured over 5-minute intervals, [and the post modification included five 1-minute intervals (Rion) were measured to test for consistency] at each location. Because of the long Leq averaging time, the occasional influences of non-tower related noise sources were minimized. When a louder or longer duration intrusive sound was anticipated, the sound level meter's measurement interval was paused and then continued when the interfering sound ended. The measurement interval would be restarted if the measurement were contaminated by a loud noise.

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Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station Figure I - Cooling Tower Sound Level Measurement Locations Note: The bases of the cooling towers are at least 20-feet lower than the elevation for the sound measurement. An earth berm is located about 100 to 200-ft from the cooling towers. This berm blocks the lower half of the air intakes and provides an effective acoustic barrier to the waterfall sound into the CT2 basin to the west.

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Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station 3.1 Baseline The baseline test was performed on October 12, 2004 from 5:00 am to 7:00 am with both cooling towers operating in the closed cycle mode. The ground level wind speed was less than 15 mph from the north with a clear sky and an air temperature of 51 OF.

During this test, water was flowing through all cells with three booster pumps. The west-cooling tower (CT2) had all fans operating while the east-cooling tower had fans CTI-1, 3 & 5 off. The reduced capacity of CT1 had a no to a minimal effect on the sound levels at Locations from 200 to 470-ft to the west. Copies of the field recorded sound level measurement data sheets are included as Attachment 6.1.

Measurements to the west were representative of the sound levels toward the nearest neighbors. There was no direct line-of-sight view of CT2 air inlets due to an earth berm with tall leaf bearing trees obscuring the top of the tower. There are no south facing air inlets on CT2, however there was some audible waterfall noise from the more distant CT1 air inlets.

3.2 Post Modification The post-modification sound test was performed on May 10, 2005 from 3:30 pm to 4:40 pm to the west and south. The west direction was repeated from 7:20 pm to 9:00 pm for confirming the afternoon measurements. During this test, the towers were configured to operate as close as possible to the baseline operation. The wind speed was less than 10 mph from the south with a clear sky, an ambient air temperature of 830F for the afternoon measurements and about 68°F during the evening into the early night.

The west tower had the northern most fan (CT2-1) off. (Note: this is the non-modified fan). The east tower operated the same as during the baseline test with 3 fans off (CT1-1, 3 & 5) and water was flowing through all cells using 3 booster pumps. Copies of the field recorded sound level measurement data sheets are included as Attachment 6.2.

The post-modification sound level measurements to the west were made with a crosswind that was from the opposite direction for the baseline measurements. The trees had only early leaf foliage that only partially obscured the view of the CT2.

The Vernon Hydro Power Station was clearly audible at 400 and 500-ft distances south of the cooling towers. No measurements were made to the southwest, adjacent to the nearest residence property line. This was due to seeing a dog outside the house and the previous baseline experience of causing the dog to bark when near this residence.

4.0 ANALYSIS An adjustment was made to the post modification measurements to account for the one fan cell in CT2 that was not operating. This adjustment took into consideration the number of operating cells and the adjustment required adding 0.4 dB to the west1. No corrections were made for the south direction since these measurements were not comparable (downwind versus upwind).

This adjustment may be considered conservative because it does not include the sound contribution of water flowing thru CT2-1.

The sound level data for both tests is tabulated in Table 1. (The post modification data includes the sound level adjustment). The sound level difference column indicates that the post-Note: This correction is based on the following:

Fan Corr. (dB) = (10 x Log 10 fans)- (10 x Log I I fans) = 0.4 dB west direction 4

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Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station modification measurements to the west were generally the same or up to 1.2 dB quieter than the baseline measurements.

Table I - Summary of Sound Level Measurements Cooling Tower Baseline & Post Modification Orientation/

Reference/

Wind 12-Oct-04 10-May-05 Difference Direction Distance Condition Baseline Post Mod dB dBA dBA (1) 63.9 after

-1.2 Crosswind W est 200-ft CrosslCross 65.1 6 4.3 ev

- 0.8 C o mpa abd 64.3 eve

-0.8 Comparable 62.6 after

-0.6 Crosswind W est 300-ft Cross/Cross 63.2 62.0 ev

- 1.2 C o mpa abl 62.0 eve

-1.2 Comparable West 400-ft Cross/Cross 61.9 62.0 after 0.1 Crosswind 61.9 eve 0.0 Comparable n/a n/a Crosswind West 470-ft Cross/Cross 60.5

59. ee 0

Compaabl 59.9 eve

-0.6 Comparable Nearest Omitted Residence 525-ft Cross/Cross 59.6 om n/a n/a Southwest

/ Dog South 200-ft Down/Up 61.3 56.9 n/a Opposite Wind Not Comparable South 300-ft Down/Up 58.8 53.3 n/a Opposite Wind Not Comparable South 400-ft Down/Up 57.3 52.0 n/a Opposite Wind Not Comparable South 500-ft Down/Up 55.7 52.5 n/a Opposite Wind I_

Not Comparable Notes: 1) These dBA levels include the addition of 0.4 dB as the adjustment for the non-operating fan.

Abbreviations: Afternoon = after & Evening = eve The west direction measurements, baseline and post-modification, were measured under similar wind conditions. The baseline test had a wind more from the north, whereas the post-modification was more from the south. Measurements made south of the cooling tower were not comparable since the wind directions were directly opposing.

5.0 CONCLUSION

The cooling tower baseline and post-modification sound level tests were conducted with comparable crosswind conditions for the west direction and toward the nearest neighbors. The results of these tests confirm that the cooling towers, after their fan modifications, comply with the requirement that the cooling tower shall not increase by more than 1 dBA.

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Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station 6.0 Attachments 6.1 Baseline Data Sound Level Measurement Data 6.2 Post Modification Sound Level Measurement Data 6

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Extended Power Uprate Cooling Tower Baseline & Post Modification Noise Test Vermont Yankee Nuclear Power Station 6.1 Baseline Data Sound Level Measurement Data Sheet 1 of I VenTorg Yankee Nuctw Power Sltaion So,.d Measuement Test Procedure Cooling Tower Sound Level Measurement Data Sheet Test Date:,/16 d2T -I,,

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