ML18283A847
| ML18283A847 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/23/1977 |
| From: | Gilleland J Tennessee Valley Authority |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18283A847 (8) | |
Text
NRC FDRr,i 195
)I2 TBI NRC DISTRIBUTION FOR WI'T50 DO U.S,.NUCLEAR REGULATORV COMMISSION CKET MATERIAL DOCKET NUMBER S>-XKN F II.E NUMBE R Mr. Victor Stello Jr.
FROM: TVA Chattanooga, Tenn.
- 37401, J.
E. Gilland DATE OF DOCUMENT 5-23-77 DATE RECEIVED 05-26-77 LETTER ABORIGINAL Ocopv KNOTO R IZ E 0 UNCLASSIFIED PROP INPUT FORM NUMBE~ COPIES RECEI EO
/ g..~~e DESCRIPTION Notorized 05-23-77 l page Consisting of Temporary changes to Environmental Tech Specs, Appendix.B to Facili Operating J.icenses DPR-33 G DPR-52, Proposing change to Section 2.1 Thermal Discharge Limits that would approve a temporary increase in the discharge water temperature limits...W/attached.
justification for the requested temp'orary chang PLANT~
BROWNS FERRY UNITS 1r 2,
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SAFETY
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ACRS CYS NRC FORM 19b {2'78)
SYSTEMS SAFETY HEINEMAN SCHROEDER ENGINEERING MACARRY BOSIIAK SIK~IL PAWLICK RECTOR SAFE ROSS NOVAK ROS7TOCZY CHECK AT& I SALT7MAN iRUTBT RG EXTERNAL DISTRIBUTION NA~T'AB REG V IE LA PDR CON ULTA PLANT SYSTEMS TEDESCO 0
IPPOLITO OPERATING REACTORS STELLO OPERATING TECH.
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'KREGER CONTROL NUMBER 77>470163
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MAY 23 1977 ReF~atory Q e-TVA BTIP TS 83 o z g)g~
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Dear Hr. Stello:
In the Matter of the Tennessee Valley Authority Director of Nuclear Reactor Regulation Attention:
Mr. Victor Stello, Jr., Direct Division of Operating Reactors-Q.S. Soclear Regulatory Commission Washington, DC 20555 6
In accordance with the provisions of 10 CFR Fart 50.90, ve are enclosing proposed temporary changes to the environmental technical specifications for the Brovas Perry Nuclear Plant unit i os.
1 and 2
(Appendix B to Facility Operating Licenses DPR 33 and DPR-52),
and the Brovns Perry Nuclear Plant unit No.
3 (Appendix B to Facility Operating License DPR<<68).
Enclosure 1 is a proposed change to Section 2.1 THERMAL DISCHARGE LINIS that would approve a temporary increase in the discharge vater temperature limits.
Enclosure 2
provides )ustification for the requested temporary change.
This aatter,has been discussed with members of your staff.
Approval is requested by Junc 6, 1977, so the testing may proceed on schedule.
Very truly yours, J.
E. Cilloland Assistant Manager of Pover Subscribe" an) svo to before me this~+'day o
1977 otary Public V<y Caasaissfo<<
txpfr<<<<~b~y LMM:CLM:JMW:OEG:BT Enclosures cc:
See pago 2
771470}.63
~+I "Pf pll
Hr. VMtor Stallo, Sr.
Mav 83 57T
~e Qaelosuraa):
Sr.
Tom Voabacb Operating Reactors Branch No. l Mvtaion of Operating Reactors U.S. nuclear Regulatory Comuisaion Mashing ton, DC 20555
Enclosure LIbKTXL!G COSH)XTXO:LS FOR OPZBAVXOH TjfEP..':AL DXSCF~GE LL'XTS Vunitorin Peauirement Ob]ective The purpose of this specification is to limit the thermal stress on. aauatic life in,klheeler Reservoir 'by operating Browns Ferry Nuclear Plant so as to meet the applicab3.e vater cLua3.ity temperature standard.s of the State of Alabama,.
S cification The. plant-induced reservoir water tempera-ture at the 5-foot depth at the cLownstream contxo3. point shall not exceecL the vatex temperature measured. at the 5-foot depth of the upstream contro3. monitor 'by xcore than th app3.icable mMcimum temoerature rise {currently 5 F+)nor sha13. the reser-voir water temp xature measured, at the 5-foot depth at the downstream contxol point exceed. the app3.ica'ble maximum water tem-perature
{currently 86 F ) due to the dischaxge of the condensex. cooling water.
Xf this limiting condition is exce
- cLed, the plant operator sha3.1 initiate control m asures.
The contro3. measures shall be
{3) to reduce the waste heat discharged ho the reservoir ancL/ox
{2) to x ecLuest nodifica-tions in the xeleases from TVA's Guntersvi3.3.e and/ox'heeler Dams to increase the streamflow 'by the Rrowns Ferry plant.
~During a special diffuser performance study during the summer of 1977 (anti-cipated completion in June, 1977), a maximum temperature rise of 10 F and a maximum water temperature of 90 F, both recorded. at the 5-foot depth, wil1 be permitted.
Bases The vater temperature data collected, by the thexvm3. monitoring network; is tele-meterecL to the 3rowns Ferry meteoro-logic83. s'tation The'eteorologica3.
station v5.11 receive the data and. auto-matically record. the readings evexT 60 minutes.
A11. temperature data ere xecord.ed. on paper tape and, maintaineR for record:3ceeping ptuxposes The 5-foot depth temperature data vhich are used. to px'event exceeding the 3.imiting cond.ition villbe transmitted to the contro3. room and villbe visually displayed. for moni-toring purposes.
The accuracy of the system and. th'sensitivity of the thermistor sensors are designed to b
+ 0.3 F and. 0.01 F, xespectively.
Three thermal mnito s spacecL across the reservoir in the vicinity of xiver nile 292.5 shaH. serve as the downstream con-trol.
iso monitoxs located above the
.plant, on located. at about x iver mile 297.6, and a seconQ, locatecL in this vicinityvillproviQe the upstream vater temperature Rata.
The system is designed so that the cLovnstream control monitors serve as b coup for on anothex anR similar3y for. the tvo upstream monitors-Th" locations of existing temperature monitors are displayed in Figure 2-1-3--
Xn the event the system described is out of service, an alternate method vill'be employecL three times a day {once each sMft) to measure the xiver temperature at the 5-foot depth in the vicinity'f'he upstream and. Qovnstxeszn contro3.
monitors and. thus determine the tem-pexature xise anR th maximum river vatex teztperature below the plant, When such a method. would result in an imminent ancL substantia3.
endangexment to th safety of personne3., thi paragraph sha31 not app3y.
7VA, as a Federa1 agency, is recLuireR 'by Section 313 of the Federal Mater Pollution Control Act Amendments of 1972 {P.L.92-500) anR by Executive Ordex 11507, "Preven-tion, Control and. Abatement of Air anR Mater Po33.ution at Federal FacQ.itics," to meet applicablc Federa3., state, anR local vater cLuaUty stanRords.
On J~ 17, 1972> the State of Alabama, adoptecL and. on September 19, 3.972, the Environmntel Protection Agency
Enclosure 2
J f'
f P
dE The following is a brief discussion of the short-term field study that TVA proposes to conduct in order to verify plant discharge
.diffuser mixing.
TVA proposes to conduct a series of instream temperature and flow measurements during the summer of 1977 in Wheeler Reservoir near the Browns Ferry Nuclear Plant, using specially equipped boats.
Although the period of testing may be several weeks long, the actual test time (total) is not expected to exceed. approximately one week.
The tests will evaluate the actual thermal mixing characteristics of the diffusers under preplanned conditions of river flow and plant operation consistent with system power generation requirements.
The results of these tests will be used to:
a.
Assist the plant personnel in routinely operating the condenser cooling system of the plant in compliance with the thermal water quality standards and b.
Further refine theoretical methods and, models used in the design of future underwater diffuser systems being considered at new plants.
During initial phases of the tests measurements will be made of the diffuser performance under low and reverse flows in the river with the plant's condenser cooling system operating on cooling towers in the helper mode.
During the final phase measurements will be made under the full range of river flows and while the plant is operated with the condenser cooling system in open mode (no cooling towers in service).
During the study period records of temperature data from the boat 'surveys and from the system of installed reservoir monitors will be maintained.
Model verification is required by Section 4.l.l(b) Thermal Plume Mapping of the ETS'S, which states that TVA must "verify the accuracy of thermal plume models used in predicting environmental effects from the thermal releases from the Browns Ferry Plant."
This proposed study should provide valuable information in evaluating the accuracy of thermal plume model predictions at Browns Ferry Nuclear Plant.
Due to the nature of'his study, the present thermal discharge limits specified in Section 2.1 of the ETS's may be exceeded for short periods of time.
Computer model predictions of mixed-temperature rise for the test program indicate that the maximum plant-induced heating will be 5.1oF during one phase of the tests, but during the majority of the test period, the plant-induced heating is expected. to be less than 3 F.
Although the actual plant-induced heating may be slightly different from the predicted values, TVA believes that a maximum plant-induced temperature rise of 10 F or a maximum plant-induced water temperature of 90 F in Wheeler Reservoir for such a short duration would only result in a few fish leaving the thermally-influenced area.
Upon completion of the tests, the fish would be expected to return to the area.
Such movements would have no significant impact on the Wheeler Reservoir fisheries resources.
All other specifications and requirements related to thermal discharges from the Browns Ferry Nuclear Plant would remain in effect.