ML20054H178
| ML20054H178 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/17/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.2, TASK-2.F.1, TASK-TM NUDOCS 8206230075 | |
| Download: ML20054H178 (3) | |
Text
TENNESSEE VALLEY AUTHORITY CH AT TA NO',G A, TENN ESSE E 37401 400 Chestnut Street Tower II June 17, 1982 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Denton:
In the Matter of the
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 By letter from D. B. Vassallo to H. G. Parris dated May 13, 1982, we received a request for additional information regarding certain items of NUREG-0737 applicable to the Browns Ferry Nuclear Plant. The request pertained to item Nos. II.B.2, II.F.1.1, and II.F.1.2.
Enclosed is our response to each of the requested items.
Very truly yours, TENNESSEE VALLEY AUTHORITY kV L. M. Mills, Manager Nuclear Licensing Subscribed and sworn t before me this
[dayof
___1982.
1 Notary Public
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My Comminaion Expires Enclosure cc (Enclosure):
U.S. Nuclear Regulatory Commission Region II ATTN: James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. R. J. Clark Browns Ferry Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue
}OY 6 j
Bethesda, Maryland 20014 8206230075 820617 PDR ADOCK 05000259 An Equal Opponu- % Emcacw p
ENCLOSURE RESPONSE TO D. B. VASSALLO'S LETTER TO H. G._PARRIS DATED MAY 13, 1982 REQUEST FOR ADDITIONAL INFORMATION REGARDING SCHEDULES ON NUREG-0737 ITEMS BROWNS FERRY NUCLEAR PLANT
References:
1.
TVA letter from L. M. Mills to H. R. Denton dated December 23, 1980 2.
TVA letter from L. M. Mills to H. R. Denton dated April 14, 1982 3
TVA letter from L. M. Mills to H. R. Denton dated October 28, 1981 Item II.B.2 - Plant Shielding NRC REQUEST NUREG-0737 requires that plant modifications be completed by January 1, 1982. Your letters dated December 23, 1980 and April 14, 1982 do not state whether the modifications are complete. Your letter dated October 28, 1981 did not list this item. State whether the modifications are complete. If they are not, provide a schedule for completion with a ctacussion of what has not been completed.
TVA RESPONSE By references 1 and 2 we intended to indicate that based on our review of plant shielding no modifications were required.
Items II.F.1.1, Sampling and Analysis of Plant Effluents and II.F.1.2, Sampling and Analysis or Measurements of High-Range Radiciodine and Particulate Effluents in Gaseous Effluent Streams NRC REQUEST NUREG-0737, item II.F.1.1 discussed the requirements for a noble gas effluent monitor; item II.F.1.2 discussed the requirements for sampling gaseous iodine under postulated accident conditions. B of your letters dated October 28, 1981 and November 20, 1981 appears to have the title for these two items interposed. Is it your proposal that iodine sampling capability fully meeting the requirements of item II.F.1.2 be in-place and functional on all three units by October 1, 19847 In your October 28, 1981 submittal, you did not provide a schedule for installation of the noble gas monitors since it was your position that there is no monitor available that will satisfy our requirements. We have repeatedly
- advised your staff--with respect to both Browns Ferry and Sequoyah--that there are at least five commercially available noble gas monitors that the NRC staff has accepted as fully meeting the requirements of NUREG-0737, item II.F.1.1.
Inasmuch as six months has elapsed since your October 28,,_1981 schedule, you are requested to update enclosure 7B providing a schedule for installation of the noble gas monitors.
TVA RESPONSE Most of the commercially available monitoring systems for high-range gaseous effluent streams include monitors for noble gases and iodine / particulate sample collection. It is TVA's intention to install one of the available systems to provide for monitoring and sampling to meet the requirements of items II.F.1.1 and II.F.1.2.
The Browns Ferry plant is designed to have one designated release point, the stack. The secondary containment features of the plant will isolate and/or realign to cleanup systems which exhaust to the designated release point. Therefore, there is a very low probability of a major release of activity within other plant zones such as the turbine building. If an accidental release does occur in other areas, a high-radiation alarm is received and the effluent vent dampers and fans can be quickly isolated. Since release paths such as the turbine building vents do not have cleanup systems, the isolation and/or shutdown of these ventilation system exhausts would be necessary to minimize the offsite doses. Once these exhausts are stopped, it is not possible to determine quantitative releases.
Therefore, TVA intends to provide a system to monitor the Browns Ferry stack for high-range noble gas with particulate and iodine collection on appropriate adsorption media. The commercially
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available equipment which is designed to meet the design basis shielding envelope provided in NUREG-0737 will be procured. In addition, the sampling system will be designed so that dose rates to employees during filter replacement do not exceed the limits of 10 CFR 50, Appendix A, General Design Criteria-19.
We will submit a revised plant modification schedule (enclosure 7B of reference 3) by July 15, 1982. However, the schedule for i
implementing items II.F.1.1 and II.F.1.2 will remain late 1984.
(NOTE: The titles of items II.F.1.1 and II.F.1.2 from enclosure 7B j
should be as indicated in NUREG-0737.)
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