ML18283A583
| ML18283A583 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/21/1975 |
| From: | Gilleland J Tennessee Valley Authority |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18283A583 (9) | |
Text
NRC DISTRIBUTION FOR PART 50 DOC!'"T I'"ATERIAL (TEI'APORARY FOAi'n)
FROM'hattanooga, Tn J
E Gilleland DATE OF DOC 3-21-75 DATE R EC'D 4-24-75 LTR T(VX RPT OTHE R XXX TO:
CLASS Mr Case UNCLASS XXXXXX PROP INFO ORIG none signed INPUT CC OTHER SENT AEC PDR SENT LOCAL PDR NO CYS REC'D 'OCKET 1
50-25 DESCR IPTfON:
Ltr trans the following:
NOTE:
ENCLOSURES:
'uppl info pertaining to their 3-21-75 Tech Specs Change submittal....with regard to thermal discharge limits.......
(40 cys encl rec'd)
PLANT NAME:
Browns Perry 1 & 2 BUTLER (I )
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March 21, 1975 Mr. Edson G.
Case Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Begulatory CoImission Washington, DC 20555 e
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/J ANNIVI"-.I-IBQRY QF I>>IlQP! f.: IN PAI-"ITNFIiGHIP VM~M
Dear Hr. Case:
Xn the Matter of the
)
Tennessee Valley Authority)
DocI:et Nos.
50-259 and. 50-260 In accordance with he provisions of 10 CFB 50.90 we are submitting herewith certain proposed changes to the Brcwns Ferry Nuclear Plant Units 1 and.
2 Environmental Technncal Specifications (Appendix B to Facility Operating Licenses DPB-33 and. DPH-52).
Also submitted.
herewith are the reasons and justifications for proposing the changes, These proposed.
changes have been discussed. with your stnff
~
nnrl as was dn nnue scR with +hop consideration of these proposed.
changes as soon representatives of genital R na~v gnat n+n V
A M I
V as possible, Very txuly yours, TF28$ESSEE VALLEY AIITHOHXTY Assistant Manager of Power Enclosures Subscribed and. sworn to before me this ~0 day of
~wi,<f'975.
Notary Public My commission expires l4 CC:
See page 2
h1r. Edson G.
Case March 21, 1975 CC (Enclosures):
)ir. Mark L. Au Huclear Regu1atory Coranission 5650 Hicholson Lane Washington, DC 20555
2,0 LI!fITIifG COliDITIO::fS FOR OPPMTIO.f 2.1 TfIEf?!fAL DISCHARGE LI!fITS
'fonitorinr !?eouirement
~0b ective The purpose of this specification is to limit the thernal stress on aquatic li e in Wheeler Reservoir by operating Browns Ferry ffuclear Plant so as to neet the applicable water ouality temocrature standards of the State of Alabama.
S ecification The reservoir water temperature at the 5-foot depth at the downstream control point shall not exceed the water temperatu.e measured at the 5-.foot depth of the upstream control monitor by more than the applicable maxinum temperature ise (currently 5 F) nor shall the reservoir water ter.".perature measured at the 5-foot depth at the downstream control point exceed the applicable r~imum water temperatu e
(currently 86 F) due to the discharge of the condenser cooling water. If this limiting condition is exceeaed, the plant operator shall initiate control mea ures.
During the interim period until cool'ng towers are avail-able the control neasures shall be (1) to restrict tnc pl ~t output so as to reduce the waste heat discharged ana/or (2) to request r.",odifications in the releases from TVA's Guntersville and/or Wheeler Dans to increase the stream-flow by the Brooms Ferry plant.
The water tenperature data collected by the thermM r..onitorinc network is tele-metered to the Browns =errv meteoro-logical station."'c r.".eteorologi ca'tation will rece ve the data and au-o-matically record the 'readings every 60 minutes.
J~l temper'ature data are recorded on paper.'tape and 'ain~ained for record keeping purposes.
ne 5-foot.
depth temperature data which are used to prevent exceeding the limiting condi ion will be transnitted'o the control rco.
and will be visually" displayed fo'r'moni-toring purposes.
The accuracy of tne system and. the sensitivity of the thermistor sensors are des'gned to be
+ 0.3 F and 0.01 F, respectively.
Three therrwl r.".onitors spaced across,, the reservoir in the v'cinity of river ~le 292.5 shall serve as the do~ms ream con-trol.
Two monitors located aoove the
- plant, one located at aoout rive mile 297.6, and. a second loca ed in thi vicinity will provide the upstream water temperature data.
'he system is designe "g
so that the downstream control...oni ors serve as baca;up for one anothe" and similarly for the two upstrean monitor Xn the event the svstem described is out of service, an alternate method wi>> be employed three t mes a day (once each shift) to measu c the river tenperature at the five-foot depth in the vicini y of the upst e~w and do~mstrean control monitors and thus determine the tem-perature rise and the r~imum river water temperature below the plant.
Baees TVA, as a Federal agency, is rcouired by Section 313 of the Federal
<1 ter Pol"ution Control Act Ancndments of 1972 (P.L.92-500) and by =xecutive Ordc
- 11507, "Prevention>
Control and Abater;.cnt of Air and Water Pollution at."ederal :acilitics" to mee applicable Federal,
- state, and local water ouality standards.
On July 17, 1972>
State of Alaba~ adopted and on Sep enber 19, 1972, the Znvironnental protection Agency 1
,""'"'".".,Revised',Varch 1975
d ~
I h
I
~Chan a
On page 2, Section 2.1, under "Ifonitoring Requirements,"
changes were made in the second and third paragraphs to reflect moving the monitor located. at river mile 309.5 to a new location upstream of the plant.
Basis for Chan e
Unit 1 at Browns Ferry has been in operation over a year now during which time the water temperatures in Wheeler Reservoir have be'en monitored both above and below the plant.
With the ups t ream control monitor. in its present location (about 15 miles above the plant), it has been particularly difficult to correlate the water temperature readings to the operation of the plant.
For example, as was reported in our abnormal occurrence report number BFEAO-7420W of May 29, 1974, the Alabama temperature staridard of
$.0 F. river temperature rise was exceeded although waste heat.
had. not been discharged from the plant for a number of days.
ln addition, during the fall of 1974, negative temperature rises between the upstreem and downstream monitors were recorded even when waste heat was being discharged, from Browns Ferry.
Water temperature data are now available for a period'which spans seve al 1
- years, and, after analyzing the data,. it is concluded that the monitor at river mile 309.5 is located too far upstream of the plant to provide reliable temperatures of the ambient river with which he heated discharges from the plant are being mixed.
The details of this analysis are'resented in a report, "Natural Heating and Cooling in the Wheeler Reservoir Approach to the Browns Ferry Nuclear Plant," Advance Report No. 23, Tennessee Valley Authority, Division of Water Control Planning, Engineering Laboratory, copies of which have been transmitted to the iiRC 'taff.
in Wheeler Reservoir will be periodically monitored to assess the overall water quality of Wheeler Reservoir.
(b)
Thermal Plume Mapping Ob ective Verify the accuracy of thermal plume models used. in predicting environmental effects from the thermal releases from the Browns Ferry plant.
Mater temperature'ill.be monitored at numerous depths from the water
. surface to the reservoir bottom at various locations in >/heeler Reservoir/ g Data will 'be used to verify predicted thermal plume models.
4.1.2 Biotic (a)
Benthic Monitoring Obiective The benthic monitoring program will compare preoperational data with that obtained after Browns Ferry Nuclear Plant begins operation to ascertain if changes have occurred.
Benthic organisms generally spend their life cycle in a localized area.
- Thus, species abundance
- should, provide the best indication of induced change.
S ecification The program consists of auarterly sampling at the sampling stations identified in Table 4.1-1.
All benthic moni oring will be performed.
by the Division of Environmental Planning's Environmental Biology Branch, using standard accepted biological sampling and enumer'ation procedures for benthic fauna.
These procedures are on file in the office of the Environmental Biology Branch, Muscle Shoals, Alabama.
Benthic organisms are sorted from the sediment by washing fine material through a, sieve and separating from the larger sediment.particles.
The four principal benthic macroinvertebrates selected for s udy are burrowing mayflies (Hexagenia),
aquatic worms (Oligochaeta),
midges (Chironomidae),
and Asiatic clams (Corbicula).
Revised., birch 3.97/
~Chan e
On page 15 of the specification, section 4.1.1(b) under the heading "Specification" has been changed to eliminate the specific number of and. locations for the thermal monitors in the Wheeler Reservoir and to permit all thermal data collected by whatever means to be used. in thermal plume mapping.
Basis for Chanc e The present locations of the thermal monitors were determined in part by the results of physical models of the Browns Ferry diffu ers which were outlined, in the environmental statement for the pro)ect.
Actual operating data are now available and in order to verify the thermal plume predictions, the flexibilityis needed. to move thermal monitors to different locations and to utilize other methods of data collection so that results can be based on more comprehensive information.
For example, TVA now plans to move the monitor located. near river mile 310R to another location in order to more accurately measure reer water temperature upstream from the Browns Ferry Nuclear Plant.
Xn addition, as more data are obta ned, some thermal monitors might no longer be needed for Browns Ferry and thus could be moved to other power plants.