ML20039E116
| ML20039E116 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Sequoyah  |
| Issue date: | 12/30/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737 NUDOCS 8201060544 | |
| Download: ML20039E116 (3) | |
Text
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TENNESSEE VALLEY AUTHORITY 8
~ CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II
,(ECElVED 1
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December 30, 1981 2
aAN 5 - 1982> ;
g' E g neumf y Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Tat 9
U.S. Nuclear Regulatory Commission f
Washington, DC -20555 co 3
Dear Mr. Denton:
In the Matter of the
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 50-259 50-260-50-296 The purpose of this submittal is to provide information that satisfies an.
Operating License Condition for the Sequoyah Nuclear Plant and provide information required by NUREG-0737, " Clarification of TMI Action Plan Requirements," for the Browns Ferry and Sequoyah Nuclear Plants.
The Sequoyah unit 2 Operating License (DPR-79) Condition 2.C(16).r.1 requires TVA to submit a functional description of the upgraded capabilities for the meteorological program. The enclosed response satisfies the Sequoyah unit 2 Operating License Condition 2.C(16).r.1 and provides information required by NUREG-0737, Item III.A.2 for unit 1.-
The enclosed response also satisfies the requirements of Item III.A.2 of NUREG-0737 for the Browns Ferry Nuclear Plant.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills,iManager Nuclear Regulation and Safety
[~Subscribejaa sworn to before me this J U day of 1981.
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ENCLOSURE-SEQUOYAH NUCLEAR PLANT, OPERATING LICENSE CONDITION 2.C(16).r.1 BROWNS FERRY NUCLEAR ~ PLANT, ITEM III.A.2 0F-NUREG-0737 Functional Description yrE Upgraded Meteorological Measurement and Dose Assessment Capability Specification: Each operating nucle ~ar. power plant site shall have a primary meteorological measurements system.
Response: TVA currently has an operable ceteorological-measurements system that complies with NRC guidance provided in Regulatory Guide 1.23.
l Beginning the: first quarter 1982, TVA will; report calculated data unavailability for each primary meteorological measurement system for each operating nuclear plant.
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TVA is developing a system of procedures to validate the primary source of meteorological information and.to provide an alternate source of meteorological data in the event of the failure of the primary measurement' system. Specific procedures for each site will' be technically evaluated. The results of this technical evaluation and specific ~information concerning-alternate sources of meteorological information will be furnished for. the-review by NRC staff by October 1,1982.
Specification: Two classes of near real time, site specific atmosphere transport and diffusion models should be used when accidental airborne radioactive. releases occur.
TVA currently has'a transport and diffusion model which provides estimates T*
of dose rate, cumulative dose, X/Q values, transit times, and plume-widths
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by sector. for various distances f rom the plant. The model incorporates terrain features within 10 miles of the plant and provides the above estimates.
out to 50 miles. Supplemental synoptic information is available to p.rmit e
interpretation of long-range transport estimates.
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TVA will continue to review the technical basis for a Class B numerical model. A schedule for implementation of Model B will be provided upon B
further definition of specific requirements by NRC.
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Specification
- All systems producing meteorological data and transport and diffusion estimates shall have the capability of being remotely.
interrogated.
Response: TVA demonstrated, during the September 1981 Browns Ferry Nuclear
-Plant radiological exercise, the ability to remotely interrogate Regulatory j'
Guide 1.23 meteorological variables from the primary system.
All data conforms with standards for accuracy provided in Regulatory Guide 1.23.
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TVA has been informed that changes to the format for remote interrogation will be included in a proposed Revision I to Regulatory Guide 1.23.
Upon publication of a final specification for remote interrogation, TVA will provide a schedule for implementation.
NRC has not furnished sufficient guidance specifying a meaningful form for the direct interrogation of transport and diffusion calculations.
TVA will furnish a schedule for implementation when specific guidance is provided.
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