ML21286A535

Amendment 29 to Updated Final Safety Analysis Report, Chapter 14, Table 14.8, Analytical Methods,

ML21286A535
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Site:	Browns Ferry
Issue date:	10/04/2021
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
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BFN-16 Table 14.8-1 CHARACTERISTICS OF NUCLEAR EXCURSIONS WATER-MODERATED OXIDE CORES Reactivity Peak Insertion Minimum Energy Principal Rate Period Density Shutdown Range

($/sec)

(ms)

(cal/gm)

Mechanisms Low

<2.5

>4

<120 Doppler Effect Moderator Effects Medium 2-25 7-2 100-425 Doppler Effect High

>20

<3

>380 Doppler Effect Core Disassembly Table 14.8-2 DOSE COMPUTATIONAL METHODS WIND DIRECTION PERSISTENCE Frequency of Duration in Hours Longest (One Sector - 22 1/2)

No. Hours**

Longest in any Station Direction*

50%

10%

1%

0.1%

No. Hours Direction Augusta, Georgia W

2 3

8 13 18 W

18 Birmingham, Alabama S

2 4

9 16 16 SSE 20 Chicago, Illinois SSW 2

5 12 21 22 NSE 25 Little Rock, Arkansas SSW 2

4 9

17 28 SSE 28 Phoenix, Arizona E

2 3

6 9

12 E

12 Rochester, New York WSW 2

6 13 23 28 WSW 28 Salt Lake City, Utah SSE 2

4 7

13 15 S

17 San Diego, California NW 2

6 12 16 17 WSW 33 Tampa, Florida ENE 2

3 7

13 14 SSW 18 Yakima, Washington W

2 5

8 14 17 WNW 19

• Direction examined is the one showing greatest frequency of persistent winds.

• • Longest number of hours observed may not be same direction as direction showing most frequency of persistent winds.

BFN-16 Table 14.8-3 METEOROLOGY APPLICABLE TO DESIGN BASIS ACCIDENTS Time After Diffusion Conditions Wind Variance During Breathing Rate Accident Investigated Indicated Time Period M3/sec Stability Category*

u 0-8 hrs VS-1, MS-1, 0.1 for = 1.0 None (centerline 3.47 X 10-4 N-1, N-5, 1.0 for = 5.0 concentration)

U-1, U-5 8-24 hrs VS-1, MS-1 0.1 for = 1.0 None (centerline 1.75 X 10-4 N-1, N-5 1.0 for = 5.0 concentration)

U-1, U-5

>24 hrs VS-1, MS-1 0.1 for = 1.0 Wind assumed to 2.32 X 10-4 N-1, N-5 1.0 for = 5.0 blow in 22.5 U-1, U-5 sector 1/4 of the time

• VS denotes very stable meteorological conditions.

MS - moderately stable, N-neutral, and U - unstable meteorological conditions. 1 and 5 denotes wind speed in meters/second.

BFN-16 Table 14.8-4 CALCULATED AIR CONCENTRATION FOR 183 METER RELEASE HEIGHT (Curie-sec/m 3

/curie released)

Meteorological Conditions Distance Activity of (meters)

Interest VS-1 MS-1 N-1 N-5 U-1 U-5 1,400 Noble Gases 0

5.3 X 10-18 2.1 X 10-7 2.3 X 10-9 4.0 X 10-6 4.3 X 10-7 Halogens 0

5.3 X 10-18 2.1 X 10-7 2.3 X 10-9 3.9 X 10-6 4.2 X 10-7 3,000 Noble Gases 0

4.2 X 10-12 1.7 X 10-6 1.5 X 10-7 1.9 X 10-6 2.9 X 10-7 Halogens 0

4.2 X 10-12 1.7 X 10-6 1.5 X 10-7 1.9 X 10-6 2.8 X 10-7 8,000 Noble Gases 1.8 X 10-36 1.4 X 10-8 9.8 X 10-7 1.7 X 10-7 4.7 X 10-7 8.4 X 10-8 Halogens 1.8 X 10-36 1.4 X 10-8 9.4 X 10-7 1.6 X 10-7 4.4 X 10-7 7.9 X 10-8 16,000 Noble Gases 1.9 X 10-22 1.3 X 10-7 4.1 X 10-7 8.2 X 10-8 1.7 X 10-7 3.2 X 10-8 Halogens 1.9 X 10-22 1.3 X 10-7 3.9 X 10-7 7.6 X 10-8 1.6 X 10-7 2.9 X 10-8 Symbols refer to stability and wind speed, i.e., VS, MS, N, U, means very stable, moderately stable, neutral and unstable respectively and 1 and 5 means 1 meter/sec and 5 meters/sec, respectively. The diffusion parameter u assumed is 0.1 radian-meter/sec for the 1 meter/sec cases and 1.0 radian-meter/sec for the 5 meter/sec cases.

Table 14.8-5 CALCULATED AIR CONCENTRATION FOR 183 METER RELEASE HEIGHT (Curie-sec/m 3

/curie released)

Meteorological Conditions Distance Activity of (meters)

Interest VS-1 MS-1 N-1 N-5 U-1 U-5 1,400 Noble Gases 3.9 X 10-5 7.2 X 10-5 3.9 X 10-5 1.1 X 10-5 7.5 X 10-6 2.0 X 10-6 Halogens 3.7 X 10-5 7.0 X 10-5 3.7 X 10-5 1.1 X 10-5 6.9 X 10-6 1.8 X 10-6 3,000 Noble Gases 1.1 X 10-5 4.2 X 10-5 1.1 X 10-5 3.5 X 10-6 1.9 X 10-6 5.2 X 10-7 Halogens 1.0 X 10-5 3.8 X 10-5 1.0 X 10-5 3.1 X 10-6 1.7 X 10-6 4.6 X 10-7 8,000 Noble Gases 2.1 X 10-6 1.5 X 10-5 2.1 X 10-6 6.5 X 10-7 3.3 X 10-7 8.9 X 10-8 Halogens 1.8 X 10-6 1.2 X 10-5 1.8 X 10-6 5.6 X 10-7 2.9 X 10-7 7.5 X 10-8 16,000 Noble Gases 6.2 X 10-7 6.8 X 10-6 6.2 X 10-7 1.9 X 10-7 9.6 x 10-8 2.5 X 10-8 Halogens 5.2 X 10-7 4.7 X 10-6 5.2 X 10-7 1.6 X 10-7 8.0 X 10-8 2.0 X 10-8 Symbols refer to stability and wind speed, i.e., VS, MS, N, U, means very stable, moderately stable, neutral and stable respectively and 1 and 5 means 1 meter/sec and 5 meters/sec, respectively. The diffusion parameter 8,45 u assumed is 0.1 radian-meter/sec for the 1 meter/sec cases and 1.0 radian-meter/sec for the 5 meter/sec cases.

BFN-16 Table 14.8-6 THYROID DOSE CONVERSION FACTORS Effective 1/2 Life E

C'i Rad/

Isotope (Days) fa (Mev/dis) curie inhaled)

I-131 7.6 X 10 2.3 X 10-1 2.3 X 10-1 1.48 X 106 I-132 9.7 X 10-2 2.3 X 10-1 6.5 X 10-1 5.65 X 104 I-133 8.7 X 10-1 2.3 X 10-1 5.4 X 10-1 4.21 X 105 I-134 3.6 X 10-2 2.3 X 10-1 8.2 X 10-1 2.64 X 104 I-135 2.8 X 10-1 2.3 X 10-1 5.2 X 10-1 1.30 X 105