ML18283A586
| ML18283A586 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  (DPR-033, DPR-052) |
| Issue date: | 03/21/1975 |
| From: | Gilleland J Tennessee Valley Authority |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18283A586 (10) | |
Text
DISTRIBUTION FOR PART 50 D ET MATERIAL (TEMPORARY FORM) coNTnoL No:
F I LE.
Enviro FROM.Tennessee Valley Authorit Chattanooga, Tenn J
E Gilleland DATE OF Doc 3-21-75 3-25-75 XX DATE REC'D LTR TWX RPT OTHER To:
Hr. Edson G. Case ORIG 2-signed CC OTHER SENT AEC PDR xxx SENT LOCALPDR CLASS UNCLASS XXXX PROPINFO INPUT No CYS REC'D 40 DOCKET NO:
50-259 and 60 DESCRIPTION:
Ltr notarized 3-20-75 proposed changes to the Brogans Ferry Nuclear Plant Units 1 arid 2
'nvironniental Tecli-.
Specs EiUCLOS U R ES:
Reasons andgustiffcations for proposing the changes'~
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March 21, 1975
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TENNESSEE VALLEYAUTHORITY DHA~ANOOGA, TENNESSEE 3740'I
~ZP-ANNIVERSARY
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Mr. Edson G. Case Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Case:
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In the Matter of the
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Tennessee Valley Authority)
Docket Nos.
50-259 and. 50-260 In accordance with the provisions of'0 CFR 50.90 we are submitting herewith certain proposecl changes to the Browns 'Ferry Nuclear Plant Units 1 and. 2 Environmental Technical Specifications (Appendix B to Facility Operating Licenses DPR-33 and. DPR-52).
Also submitted.
herewith are the reasons and Justifications for proposing the changes.
These proposed.
changes have 'been discussed. with representatives of your staff; and.,
as was discussed with them, we would. appreciate consideration of these
- proposed, changes as soon as possible.
Very truly yours, TENIIESSEE V~ AUTHORITY
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t/J. E. Gilleland Assistant Manager of Power Enclosures Subscribed and sworn to before me this mO day of z
. D 1975.
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Notary Public My commission expires Z4 X P 4 C
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CC:
See page 2
)h. Erson G. Case March 2l, l975 CC (Enclosures):
Mr. Mark L. Au Nuclear Regulatory Conunission 5650 Nicholson Lane Washington, DC 20555
2.0 LIMITIifGCOiiDITIOiS FOR OPEHATIOIt 2.1 THERIfAL DISCHARGE LIt.GTS Monitorinr '.?enuirement
~01 ective, The purpose of this specification is to limit the thermal stress on aquatic life in Mheeler Reservoir by operating Browns Ferry iiuclear Plant so as to meet the applicable water cuality temperature 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 temperature measured at the 5-foot depth of the upstream control monitor by more than the applicable maximum temperature rise (currently 5 F) nor" shall the reservoir water temperature measured at the 5-foot depth at the downstream control point exceed the applicaole maximum water temperature (currently 86 F) due to the discharge 0
of the condenser cooling water. If this limiting condition is exceeded, the plant operator shall initiate control measures.
During the interim period until cooling towers are avail-able the control measures shall be (1) to restrict the plant output so as to reduce the waste heat discharged and/or (2) to request modifications in the releases from TVA's Guntersville and/or Wheeler Dans to increase the stream-flow by the Browns Ferry plant.
The water temperature data collected bv the thermal monitoring network is tele-metered to thc Browns Ferrv meteoro-logical station.
The meteorological station will receive the data and au o-matically record t'e readings every 60 minutes.
All temperature data are recorded on paper tape and maintained.
for record keeping purposes.
he 5-foot depth temoerature data which are used to prevent exceeding the limiting condition will be transmitted to the control room and will be visually displayed for moni-toring purposes.
he accuracy of the system and the sensitivity of the thermistor sensors are designed to 'be
+ 0.3 F and 0.01 F, respectively.
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Three thermal monitors spaced across the reservoir in the vicinity of river mi e 292.5 shall serve as the downs ream con-trol.
Two monitors located above the
- plant, one located at aoout river mile 297.6, and a second located in this vicinity will provide the upstream water temperature data.
The system is designe P
so that the downstream control monitors serve as backup for one anothe.
and similerlv for the two upstream monitors.
In the event the svstem described is out of service, an alternate method w:11 be employed three times a day (once each shift) to measure the river temperature at the five-foot depth in the vicinity of the upstream and. downstreet control monitors and thus determine the tem-perature ris and the rmimum river water temperature below the plant.
Bases TVA, as a Federal agency, is required by Section 313 of the Federal Mater Pollution Control Act Amendments of 1972 (P.L.92-500) and by Executive Order 11507, "Prevention>
Control and Abatement of Air and Mater Pollution at."ederal Facilities" to meet applicable Federal,
- state, and local water quality standards.
On July 17, 1972, thc State of Alabama adopted and on September 19, 1972, the Environmental Protection Agency Revised March 1975
~Chan e
On page 2, Section 2.1, under "Monitoring 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 been 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 standard of 5.0 F. river temperature rise was exceeded.
although waste heat had'- not been discharged from the plant for -a number of days.
In addition, during the fall of 1974, negative temperature rises between the upstream 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 several
- 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 the heated discharges from the plant are being mixed.
The details of this analysis are presented 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 plater Control Planning, Engineering Laboratory, copies of which have been transmitted to the iiRC staff.
<<15 in Wheeler Reservoir will be periodically monitored. to assess the overall water quality of Wheeler Reservoir.
(b)
Thermal Plume Mapping
~0b ective Verify the accuracy of thermal plume models used in predicting environmental effects from the thermal releases from the Browns Ferry plant.
S ecification
/
lD Water. temperature will be monitored at numerous depths from the water surface to the reservoir bottom at various loca ions in Wheeler Reservoir J Data will be used to verify predicted thermal plume models.
4.3..2 Biotic (a)
Benthic Monitoring
~ob ective 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 quarterly sampling at the sampling stations identified in Table 4.1-1.
All benthic monitoring will be performed by the Division of Environmental Planning's Environmental Biology Branch, using standard.
accepted biological sampling and. enumeration procedures for benthic fauna.
These procedures are on file in the office of the Environmental Biology Branch, Muscle Shoels, Alabama.
Benthic organisms are sorted from the sediment by washing ine, material through a sieve and separating from the larger sediment particles.
The four principal benthic macroinvertebrates selected for study are burrowing mayflies (Hexagenia),
aquatic worms (Oligochaeta),
midges (Chironomidae),
and Asiatic clams (Corbicula).
Revised March 1975
~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 f'r Chan e
The present locations of the thermal monitors were determined, in part by the results of physical models of the Browns Ferry diffusers which were outlined in the environmental statement for the prospect.
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 exemple, TVA now plans to move the monitor located near river mile 310R to another location in order to more accurately measure river water temperature upstream from the Browns Ferry Nuclear Plant.
In addition, as more data are obtained, some thermal monitors might no longer be needed for Browns Ferry and. thus could be moved to other power plants.
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