ML20084H689
| ML20084H689 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/29/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-BFAO-7420W, NUDOCS 8305040729 | |
| Download: ML20084H689 (6) | |
Text
-
/3 (S
l
()
N)
TENNESSEE VALLEY AUTHORIT/ ag r7L l
CHATTANOOGA, TENNESSEE.
.l'li -
37401 L (C ;, (. 3q ~J D_._lb SWNESN5N Mcy 29, 1974 4s
'/.s PAMTN C ASHIP g
h
./
/"A w s#. 'kg 2 w e't
~
456
/
D.t
- vi v 2"
h8:,. A
~ I'*
}lM e*Uly,' t)
/D
~
Mr. John F. O' Leary, Directar 4
- 'iMV
%/?
Directorate of Licensing g
Office of Regulation g7 d'
U.S. Atomic Energy Cor.:::lission sq i(2
- Washin5 ton, DC 20545 JV'
Dear Mr. O' Leary:
TENIESSEE VALLEY AUTHORITY - BROWIIS FERRY I!UCLEAR PLallT UNIT 1 -
4 DOCKET UO. 50-259 - FACILITY OPEPX2IHO LICEUSE DPR ABHORMAL OCCURRENCE REPORT 3FEAO-74207 The enclosed report is to provide details concerning two river te::merature increcscs exceeding the Environmental Technical Specifi-cation, which. occurred on Browns Ferry IMclear Plant unit 1 on l'ey 19, 1974, while the plant uas in the shutdown condition. This report is submitted in accordcnce with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973 Very truly yours, TENUESSEE VALLUY AUTHORITY
. blhlf" f
.h!Thobs I
Director of Power Production Enclosures CC (Enclosures):
Mr. Horr.an C. Moseley, Director Region II Regulatory Operations Office,.USAEC 230 Peachtree Street, MI., Suite 818 -
Atlanta, Georgia 30303
.IW 0[U (
o +5 \\
/d
'L 8305040729 740529 PDR ADOCK 05000259 S
PDR 4808
<m sur mnon 3:2: _
i v
1 ABNORMAL OCCURRE:TCE REPORT Report No.:
BFEAO-7420W Report Date: Mcy 29,;1974
' Occurrence Date: Mcy 19, 1974-Facility: Browns Ferry nuclear Plant unit 1 e
'7dentification of Occurrence At 9:15 p.m. and 11:00 p.m. on May 19, 1974, Brotms Ferry Nucicar Plant exceeded the Environmental Technical Specification limit of 5.0 F. river te=perature increase.
Conditions Prior to Occurrence The reactor had been in the shutdown condition since Fay 6.
Riverflow at the plant site averaged over '40,000 cfs for May 19. Average daily ralcases from
.Guntersville and Wheeler Dans were 37,100 and 48,000 cfs, respegtively. The weather was partig cloudy and air temperatures ranged from 85.6 F. at 12 m.
-to a high of 89 2 F. at 3 p.m.
i
'Descriotion of Occurrence The tercerature difference between the upstrecn control ronitor at TRM 309 7 and the downstrean =onitor at TRM 292.5, as dispicyed in the power plant control room, reached 5.9 F. at 9:15 p.m.
The data printouj; from the conitoring stations clso showed a te=perature difference of 5.2 F. at 11 p.m.
Data showing te=peratures during the occurrence are tabulated in tables 1, 2, and 3.
Desittnation of Annarent Cause of Occurrence This situation was apparently caused by a natural difference in the temperature of the water between the upstrecn and downstream monitors at the 5-foot depth.
This difference is not the result of plant operation but is apparently caused by conditions other than plant operations.
Analysis of Occurrence Tables 2 and 3 show the variation of temperatures at the surface and at the 5-foot depth throughout the =enitored reach of the river during the ' abnormal occurrence period.- These tables show a higher te=perature rise between the three upstream-monitors than between any of the four monitors in the i==ediate upstream and doimstrean vicinity of the plant.
Although the plcnt had been in shutdown condition since May 6, all three condenser circulating water pu ps re.ained in service providing a flow of rbout 1,400 cfs.
The co=puter that =cnitors circulating water conditions was shut down at 12:04 p.=c on Pgy 19 The last te=perature recorded showed cg average inlet temperature of-
.75.3 F. and en average outlet temperature of 75.1 F.
Therefore, the abnormal-occurrence could not_have been caused by plent operations.
+
1 4
v
'M'r vs 9
Ni
i O
O..
i-
. Corrective Action-An i=ediate solution to this problem is not available.
We are still working on a technique to interpret the data from the conitoring system to account for the effects of solar heating and lateral wind-induced currents. This should provide a river temperature rise core reficctive of plant discharge.
i 1
9 i -
6.
e 4
f l
1 I
I i
I i
J l
i O
l' l
1
- m._
o o.
\\
~
~
Table 1 I
BRoWI;S FERRY I2tCLFAR FIAI.T RIVER TFPERATURES FROM Co:CRoL Room PRII:ToLT. *F.
s' May 19, 1974 L
r Downstream Temperature Time Temperature Rise 1500 74.8 13 1600
.74 9 17 1700 75 1 19 1800 74 5 05 1900 75.o 1.6 2000 76 9 32 2014 78.o 4.6 9030 77 9 38 2100 78.2 4.0 2114 79 3 59 213o 78 3 49 2200 76 9 35 2300 79 8 0.0 233o 77 5 4.1 2400 77 2 38 O
O e
9 O
f~\\
(
.q).
. Tabic 2 RIVER TDIPEPATURES FRoM tIONITOR PRIUTotR. *F.
s SURFACE--!'AY 19. 1974
)
Station
.No. ' 6 No. 4 No. 7 No. 6 No. 9 No. lo No. 11 Time. TK4 309 7R Tai 297 78L Tai 295 7R TK4 294.5L TPl4 292 5R Tmi 292 5L TR'4 202 91
- c. T cT 2200 76 9 82.0 81 7 81 3 80.o 80.2 82.6 57 1300
~76.8 80.4 84.2 84.6 81.8 82.0 79 3 52 1400 74.6 82 7 87 3 83 9 84.o 85 2 80.2 10.6 1500 73 9 82.8 84 9 83 5 85 1 86 7 80.4 12.8 16do.
74.2 84 9 88.4 83 2 83 7 85 5 79 3 11 3 1700 74.4 86.1 1800 74 3 84.4 86.6 85 4 83'.7 83 0 81.8 94 1900 73 9 79 4 83 7 85 3 83 4 83 2 79 9 95 2000 73 4 78.1 82.1 79 7 82.6 83 8 79 9 1o.4 75 8 2100 2200 74.2
'75 3 78.8 75 8 78.8 81 7 78.1 75-2300 73 4 74.4 78 3 75 8 78.8 81 5 8.1 2400
~73 6 74.1 78.1 75 5 78.0 79 6 79 2 6.o' b.T = Difference in temperature between control station No. 6 and the taximum te=perature indicated at stations No. 9, No. 10, and No. 11.
~
l C
l a
WilL JRil:!IDG
~
5-2b-74 aa 2
L.r u
.t
1 Q.
O~
~,
Table 3
~
RIVER'TEL'PEMTURES FROM I407:ITOR PRII;Tol[T.
'F.
s FIVE-Foot DEPTH--!'AY 19. 1974
/
Station 4.No. 6 No. 4 No. 7 no. 8 No. 9 No. lo No. 11 Tim's TR4 300.7R TE4 247.78L TE4 295 7R TRM 294.5L TRM 202. 5R TRM 202 5L TR*4 2 T. 5M f_ T CT 1200 72 7 73 7 74 7 73 2 73 7 75 1 74 7 2.4 1300 74.4 76 5 74.6 73 6 73 4 76.0 73 5 1.6 1400 73 2 76.8 74 5 73 9 V3 9 74.8 73 4 1.6 1500-73 6 76 7 74.6 74 5 73 3 74 7 73 7 1.1 1600-73 7 78.8 74.8 74.1 73 1 75 0 73 7 13 1700 73 8 75 5
-1800 74.1 74 5 75 3 73 9' 73 2 74 5 73 7 o.4 1900 73 9 74 5 75 4 73 4 73 2 74 3 74.1 0.4 2000 73 5 74.6 76.4 73 9
. 73 3 77 2 74.4 37 2100 74.6 2200 73 4 74 3 76.o 74.6 75 6 76 5 75.6 31 2300 73 4 73 9 76 5 74.4 78.6 75 5 52 i
2400 73 4 73 9 76.8 74.1 77.o 74 9 76.1 36 o T = Difference in terperature between ::entrol station No. 6 and the maximum temperature indicated at stations Ho. 9; Ho. lo, and No.11.
t l
ElIL:JRil:!!DG l
. 5-28-74
,-