ML19308A829
| ML19308A829 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/02/1977 |
| From: | Parker W DUKE POWER CO. |
| To: | Case E, Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912120620 | |
| Download: ML19308A829 (8) | |
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/ 195 NRC DISTRIBUTION Fon PART 50 DOCKET MATERIAL FROM:
oATE op coCUMENT Duke Power Company 9/2/77 f
Mr. E. G. Case Charlotte, North Carolina cATc RecEivso William O. Parker 9/6/77 2LgrrEn CNoTomlZEo PRCP INPUT PoRM NUMBER op COPIES RECEIVEo C ofitGIN AL CuNcLAss:Piso Ccon j gg,jgg ESCRIMioN ENCLoJU RE Consists of information furnished in response to NRC staff questions concerning a?plicant's Appendix I submitted on June 4, 19~C rc the Turbine Building Exhaust Systen...........
with attached drawings..........
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422 SouTn Cacacu STREET, CHARI.OTTE. N. C. asa m WI LLs AM O. PAR M ER. J R.
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' /ru. 'D Mr. E. G. Case, Acting Director cy Y'#
Office of Nuclear Reactor Regulation 4 h:\\',
U. S. Nuclear Regulatory Commission
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Washington, D. C.'2055'
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Attention:
Mr. A. Schwencer, Chief Operating Reactors Branch # 1 Re: Oconee Nuclear Station Docket Nos. 50-269,-270,-287
Dear Sir:
The attached information is in response to questions from your staff concerning the Oconee Nuclear Station Appendix I submitted on June 4, 1976.
Very-truly yours,
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l William O. Parker RLG/mlr Attachment l
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RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ON 10CFR50 APPENDIX I 1.
Question : Provide the description of the Turbine Building Exhaust System, including flow rate, velocity,-height above grade, height above and relative location to adjacent structures, relative temperature difference between exhaust effluent and ambient air, and size and shape of the flow orifice.
Response - Details of the Turbine Building Exhaust System fans for each unit are as follows:
Unit - 1 I
1.
a)
Height of Fans lA through ID above grade = 91 ft - 6 inches.
b)
Height of Fans IF through II above grade = 60 ft - 9 inches.
c)
Height of Fan 1E above grade = 43 ft - 6 inches.
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2.
Expected average temperature difference between gaseous effluent and ambient air = (115 - 95 ) = 20 F, (all fans).
3.
a)
Flow Rate, Fans lA through 1D = 69,000 CFM Each b)
Flow Rate, Fans lE through 11 = 58,000 CFM Each 4.
a)
Exit Velocity, Fans lA through 1D = 1940 FPM b)
Exit Velocity, Fans 1E through II = 2440 FPM 5.
Size and Shape of Flow Orifice:
a) Fans lA through 1D - 80 3/4" diameter, round.
b) Fans lE through II - 66" diameter, round.
6.
Height above and location relative to adjacent structures (all fans):
Note: All fans are arranged "in-line," running North - South. All locations given are from the center of this line; i.
e.,
center of Turbine Building, Unit-1, North - South dimension.
See attached drawings for additional details.
a) 4' East of Unit'l & 2 Auxiliary Building and 30 feet above it.
b).
45' East of Unit-1 Reactor Building' and 99 f t below it.
c), 225' NE of Unit-2 Reactor Building and 99 ft below it.
d) 450' NNE of-Unit-3 Reactor Building and 99 ft below it.
e) 225' SE of Administration Building and 64 ft above it.
f) 185' SW of Service Building and 62 ft above it.
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Unit - 2 1.
a)
Height of Fans 2A through 2D above grade = 91 ft - 6 inches.
b)
Height of Fans 2E through 21 above grade = 60 ft - 9 inches.
c)
Height of Fans 2J and 2K above grade = 43 ft - 6 inches.
2.
Expected average temperagure difference between gaseous effluent and ambient air = (115 - 95 ) = 20 F, (all fans).
3 a)
Flow Rate, Fans 2A through 2D = 69,000 CFM Each b)
Flow Rate, Fans 2E through 2K = 58,000 CFM Each 4.
a)
Exit Velocity, Fans 2A through 2D = 1940 FFM b)
Exit Velocity, Fans 2E through 2K = 2440 FPM 5.
Size and Shape of Flow Orifice:
a)
Fans 2A through 2D - 80 3/4" diameter, round.
b)
Fans 2E througia 2K - 66" diameter, round.
6.
Height above and location relative to adjacent structures (all fans):
Note: All fans are arranged "in-line," running north - south.
All locations given are from the center of this line; i.e.,
center of Turbine Building, Unit 2, North-South dimension.
See attached drawing for additional details.
a) 4' East of Unit 1 and 2, Auxiliary Building and 30 ft. above it.
b) 225' and SE of Unit 1, Reactor Building and 99 ft below it.
c) 45' East of Unit 2, Reactor Building and 99 f t below it.
d) 225' NE of Unit 3, Reactor Building and 99 ft below it.
e) 470' SE of Administration Building and 64 ft above it.
f) 435' SW of Service Building and 62 ft above it.
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s Unit - 3,,
1.
a)
Height of Fans 3A through 3D above grade = 91 ft - 6 inches.
b)
Height of Fans 3E through 31 above grade = 60 ft - 9 inches.
c)
Height of Fan 3J above grade = 43 f t - 6 inches.
2.
Expected average temperature difference between gaseous effluent and ambient air = (115 - 95 F, (all fans).
3.
a)
Flow Rate, Fans 3A through 3D = 69,000 CFM Each b)
Flow Rate, Fans 3E through 3J = 58,000 CFM Each 4.
a)
Exit Velocity, Fans 3A through 3D = 1940 FPM b)
Exit Velocity, Fans 3E through 3J = 2440 FPM 5.
Size and Shape of Flow Orifice:
a)
Fans 3A through 3D - 80 3/4" diameter, round.
b)
Fans 3E through 3J - 66" diameter, round.
6.
Height above and location relative to adjacent structures (all fans):
i Note: All fans are arranged "in-line," running North-South. All locations given are from the center of this line; i.e.,
center of Turbine Building, Unit 3, North-South dimension.
See attached drawing for additional details.
a) 4' East of Unit 3, Auxiliary Building and 30 ft above it.
b) 45' East of Unit 3, Reactor Building and 99 f t below it.
c) 225' SE of Unit 2, Reactor Building and 99 ft below it.
d) 450' SSE of Unit 1, Reactor Building and 99 ft below it.
e) 720' SSE of Administration Building and 64 ft above it.
f) 6858SSW of Service Building and 62 ft above it.
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2.
Question ' Indicate if each effluent release point is equipped with diffusers or spreaders.
Response - There are no spreaders or diffusers installed at the effluent release points.
3.a Question - The onsite meteorological measurements progran does not meet the recommendations of Regulatory Guide 1.23 with respect to elevations and exposure of sensors. Wind speed and direction are not measured at the 10 meter level "because of inadequate axposure near the ground" presumably caused by "20 meter trees near the tower base."
The lower temperaturo sensor used for the measurement of vertical temperature gradient is located only 1.5 meters above the ground, which would bias the resultant atmospheric stability distribution towards extremely unstable and extremely stable conditions.
The ef fect of this bias on estimates of atmospheric diffusion and deposition from partially elevated re-leases is not clear. The measurement of vertical temperature gradient would also be affected by "20 meter trees near the tower base."
The present location of the meteorological tower may not provide representative data for an assessment of atmospheric transport and
_ diffusion characteristics at and near the plant site.
To allow us to proceed with our Appendix 1 evaluation:
a) Discuss the rationale for the present location of onsite meteorological tower with respect to the representation of atmospheric transport and diffusion characteristics -(wing speed, wind direction, and vertical temperature gradient) at and near the site.
Response - The tower location for the measurement of wind direction, speed and vertical temperature gradient does not conform to present NRC guidelines in some respects.
Specifically, guidelines suggest that 1) tower elevation be the same as plant grade; 2) upper sensors be the same elevation as release height; and'3) " care should be taken to locate the stations at positions where the measurements will accurately represent the overall site meteorology..."
(Safety Guide 1.23).
With regard to points 1) and 2),
the higher elevation of tower base, 20 meters above grade, coupled with a lower tower height of 46 meters against a vent height of 60 meters, have a compensating
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effect, suggesting an appropriate estimate of wind l
direction and speed for vent releases.
Inasmuch as low q
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level flow direction cannot be adequately reprecented
'by a 10 meter sensor during general gravity flow con-ditions, all low level input is derived from sensors atop the tower. Wind speed is adjusted by a power law relationship in accordance with evaluation in Oconee SER, Units 2 and 3.
Addressing point 3), on the basis of undulating terrain surrounding the plant this location is taken as reasonably representative of topography in the vicinity of the plant with respect to wind direction and vertical temperature gradient.
See Oconee FSAR, Figure 2.2.
Thus, in all respects, the present tower location is representative of site meteorology.
3.b Question - Assess the impact of using the 1.5 meter level for the lower sensor for measuring vertical temperature gradient on estimates of atmospheric diffusion and deposition, particularly from partially elevated releases. Also, identify the surface characteristics immediately below the 1.5 meter temperature sensor.
Response - The surface immediately below the 1.5 meter temperature sensor can be characterized as a grassy area.
The effect on vectical temperature gradient from the positioning at 1.5 meters is to introduce some uncertainty where partially elevated releases are concerned.
Consequently, this level is being moved to 10 meters above the ground (this action was taken independently of the present discussion). With respect to the limits in uncertainty in delta temperature from the present arrangement, we offer the following:
The bias toward more very unstable lapses during the day is seen in the occurrence of intense lapse conditions in the existing data. We suspect, however, in view of the observation of Class A rates much of the day at other lake sites in the Duke Power service area, that the total number of Class A conditions will not change appreciably with lower sensor at 10 meters. The effect of the 20 meter trees on unstable lapse rates should not be significant.
These trees are not sufficiently dense to constitute a canopy and their effect can be disregarded during well-mixed conditions. The bias toward more stable profiles at night does not readily appear in the strength of in-versions typical at the Oconee site.
This condition is not unexpected as the 20 meter trees to some extent should provide radiative exchange tending to hold temperatures up near the ground. Assuming the effect of the trees is to alter the tempera.ture profile below 20 meters toward a less stable rat, the measured gradient with 1.5 meter sensor could be slightly less stable or slightly more stable than a gradient measured with a 10 meter sensor.
At any rate, no pronounced bias toward anomalously stable conditions is expected in the existing data.
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l 3. c' Ques' tion - Discuss the effect of "20 meter trees near the tower i
base" on the measurement of vertical temperature gradient.
i Please see paragraph 3b above.
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