ML20029C406
| ML20029C406 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/22/1991 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.2, TASK-TM NUDOCS 9103280001 | |
| Download: ML20029C406 (3) | |
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A tennessee vancy Avenmay.1i01 uanet su a cnananmga. Tennessee sno2 h hh U.S. Nuclear Regulatory Commission ATTN: Document Control Desk
. Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-259 Tennessee Valley Authority
).
50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) - FOLLOW-UP TO TVA/NRC MEETING OF JANUARY 29, 1991 CONCERM NG TVA CLARIFICATION OF NUREG 0737, ITEM II.B.2.2, PLANT MODIFICATIONS, SUBMITTED NOVEMBER 13, 1990.
The purpose of this letter is to withdraw a November 13,.1990, submittal which provided clarification of NUREG 0737, Item II.B.2.2, Plant Modifications.
Background
NUREG 0737, Item II.B.2, Plant Shielding, requested that licensees
" perform a radiation and shielding-design review of the spaces around systems that may, as a result of an accident, contain highly. radioactive material." It clarified that "any area which may require occupancy to permit an: operator to aid in the mitigation of or recovery fromian accident is designated as a vital area."
As reported in a January 17, 1980 TVA letter to the NRC staff, TVA-evaluated access to vital areas and concluded that no vital area required post-accident occupancy. An NRC Safety Evaluation Report dated March 8, 1983, concurred with this position and. concluded that tho' requirements of NUREG 0737. Item II.B.2.2, have been met.
November 13, 1990 Clarification 1
On November 13, 1990 TVA documented the resolution-of an environmental qualification -(EQ) issue related to 480 Volt RMOV boards 2D and R An element of the resolution of this issue was the introduction of a new-manual actuation (i.e., actuation of the Residual' Heat Removal (NHR),
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Specifically, following a Reactor-Water Cleanup (RWCU) line break outside primary containment, entry into the reactor building is now required to de-energize and manually actuate the RHR suppression pool cooling valves.
As noted in the submittal, a RWCU line break would be sensed as an operational transient and would not result in either a turbine. trip or-reactor protection system actuation.
TVA concluded'that core uncovery and any subsequent fuel failure would not occur as a result of a RWCU line break.
In the November 13, 1990 letter, TVA alsc, clarified the January 17 -1980, position on NUREG 0737, Item II.B.2.2.
This clarification was based on a conservative regulatory interpretation:- TVA did not segregate events that do not, result in fuel-failure.
llowever, additional review of this item by TVA and discussions with the NRC staff indicate that NUREO 0737. Item II.B.2.2, applies to accidents which result in fuel f ailure (i.e., results in release of " highly
'loactive material") and not to all accidents which require entry into t.he reactor building.
Withdrawal of Clarification TVA withdrawc the clarlfication'of NUREG 0737, Item II.B.2.2, plant Modifications, provided as-Enclosure 2 to the submittal of November 13, 1990. This withdrawal is based on analysis-which shows the RWCUEline break _to be an operational transient which does not result in fuel failure.
llowever TVA does not withdraw Enclosure 1 and Enclosure 3 of the November 13, 1990, submittal and will maintain all commitments made in-this previous submittal.
Those~ enclosures provided the NRC-staff with-a description of-the method used to resolve the EQ-issue related to 480-Volt RMOV Boards 2D and 2E.
Very truly yours,-
TENNESSEE VALLEY AUTHORITY-Is (d!
At 3
E. C. W ace, Manager Nuclear Vicenstng and
- Regulatory Affairs cc:
see page 3
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'U.S. Nuclear-Regulatory Commission g g$ hh) cct. Ms. S. C. Black, Deputy' Director Project Directorate II-A -
U.S. Nuclear Regulatory Commission One White Flint, North.
11555 Rockville Pike, Rockville,. Maryland 20852 NRC Resident Inspector Browns-Ferry Nuclear Plant Route 12,. Box 637
-Athens, Alabama 35609-2000' Mr. Thierry M. Roso.. Project Manager U.S. Nuclear Regulatory Commission One White Flint, North-11555 Rockville. Pike Rockville.-Maryland 20852 Mr. B. A. Wilson, Project Chief.
U.S. Nuclear Regulatory Commission Region II 101 Marietta Street,.NW, Suite 2900 Atlanta, Georgia -30323 t-I i
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