ML18026B117
| ML18026B117 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/27/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8408010344 | |
| Download: ML18026B117 (6) | |
Text
REGULATORY ORMATION DISTRIBUTION SY M (RIDS),
,C'CCESSION NBR:8008010340 DOC,DATE, 8u/07/27 NOTARIZED: YES DOCKET ¹ FACIL;50-259 Browns Ferry Nuclear Power Stations Unit ii Tennessee 05000259 50-260 Browns Ferry Nuclear Power Station~
Unit 2<
Tennessee 05000260 50-296 Browns Ferry Nuclear Power Stations Unit 3< Tennessee 05000296 AUTH'AME AUTHOR>> AFFILIATION MILLSgL,M~
Tennessee Valley Authority REC IP ~ NAME RECIPIENT AFFILIATION DENTONgH ~ RE Office of Nuclear Reactor Regulationi Director
SUBJECT:
Responds to 860613 request for addi info re Mark I containment long"term program analyses'afety relief valve discharge piping -sys mods based on most severe reflood conditions predicted by RVRI'Z 8
RVFDR codes'.
I DISTRIBUTION CODE:
A025S COPIES RECEIVED:LTR ENCL SIZE:
TITLE:
OR Submittal:
USI A
7 Mark I Containment NOTES:NMSS/FCAF icy, icy NMSS/FCAF/PM, OL:06/26/73 NMSS/FCAF icy, icy NMSS/FCAF/PM'L:06/28/74 NMSS/FCAF 1cy, 1cy NMSS/FCAF/PM.
OL:07/02/76 05000259 05000260 05000296 RECIPIENT ID CODE/NAME NRR ORB2 BC 01 COPIES LTTR ENCL 0
RECIPIENT ID CODE/NAME COPIES LTTR ENCL 1
0 1
'0 5
5 1
1 1
1 1
1 12'0 02 1
1 NOTES!
INTERNAL: ADM LFMB ELD/HOSE 13 NRR SIEGELz8 HRR/DE/MTEB MG RE F IL EXTERNAL; ACRS NRC PDR NTIS LPDR NSIC 03 05 EDO NRR 0IR NRR/DE/MFB NRR/DL/ORAB 10 NRR/DSI/CSB 11 RGN2 1
0 1
0 1
1 1
1 1
1 1
1 1
TOTAL NUMBER OF COPIES REQUIREDi LTTR 39 ENCL 24
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II
TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II July 27, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Denton:
In the Matter of the Tennessee'Valley Authority Docket Nos. 50-259 50-260 50-296 By letter from D. B. Vassallo to H. G. Parris dated June 13,
- 1984, we received a request for additional information regarding the Mark I Containment Long-Term Program analyses for the Browns Ferry Nuclear Plant.
The NRC requests and TVA responses are pr ovided in the enclosure to this letter.
If you have any questions, please get in touch with us through the Browns Ferry Project Manager.
Very truly yours, Subscribed a~ sworn t befo me th s ~~~day of TENNESSEE VALLEY AUTHORITY Nuclear Licensing 1984.
Notary Public My Commission Expires Enclosure cc (Enclosure):
U.S. Nuclear Regulatory Commission Region II ATTN:
James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. R. J. Clark Browns Ferry Project Manager U.S. Nuclear Regulatory,Commission 7920 Norfolk Avenue
- Bethesda, Maryland 20814 8PQ80iQQg4 840727
An Equal Opportunity Employer
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ENCLOSURE
RESPONSE
TO NRC REQUEST FOR ADDITIONAL INFORMATION D. B. VASSALLO'S LETTER TO H. G.
PARRIS DATED JUNE 13, 1984 BROWNS FERRY NUCLEAR PLANT
~uestion What, if any, analyses were performed utilizing methodology not previously approved in NUREG-0661 in determining if set point logic changes were needed to reduce water clearing thrustloads associated with second SRV actuations?
~Res onse TVA's SRV discharge piping modifications were based on the most severe reflood conditions predicted by the RVRIZ and RVFOR computer codes (load case C3.3 as defined in the load definition report).
Therefore, we comply with NUREG-0661.
In addition, no set point logic changes were required.
guestian What, if any, credit for operator action is required to prevent or reduce the thrust loads associated with second actuations of SRVs and if so, the kind of action and how long after event initiation the action is required.
~Res onse No credit was taken for operator action to prevent or reduce thrust loads associated with subsequent SRV actuations.