ML19344E502
| ML19344E502 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/18/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-17, IEB-80-17-S1, NUDOCS 8009020133 | |
| Download: ML19344E502 (2) | |
Text
/0 TENNESSEE VALLEY AUT,HORITY CHATTANOOGA. TENNESSEE 3'
[
400 Chestnut Street Tower II August 11,1 &
l ~ 08 Mr. James P. O'Reilly, Director
. Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303
Dear Mr. O'Reilly:
OFFICE OF INSPECT AND ENFORCEMElff BULLETIN 80-17, SUPPLEMENT 1 - RII:JPO
-259, -260 p,ROWNS FERRY NUCLEAR PLANT Your letter dated July 18, 1980, to H. G. Parris transmitted IE Bulletin 80-17, Supplement 1 for TVA action. Enclosed is our response to the subject bulletin aution item B.1.
If you have any questions, please call Jim Domer at FTS-857-2014.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Subscribeg ggd sworn before f
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/i,1980.
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My Commission Expires 2-
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Enclosure cc: Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Division of Reactor Operations Inspection Washington, DC 20555 8'009020l N
'ALconv An Equal Opportunity Employer
i ENCLOSURE IE BULLETIN 80-17, SUPPLEMENT NO. 1
]
BROWNS FERRY NUCLEAR PLANT (DOCKET NOS. 50-259, -260, -296)
ITEM B.1 Install a system f,o continuously monitor water levels in all scram discharge volumes. Continuous recording and alarm features must be l
included in the design. Consideration should be given to use of diverse level sensors in this (these) system (s). The design installed should
+
represent the design with the highest level of reliability compatible with completion of installation by September 1, 1980. Provide a written description of the system design to the NRC Regional Office.
RESPONSE
The following is a description of the scram discharge volume level measuring I
system now being used at Browns Ferry Nuclear Plant.
Figure 1 shows the approximate location of the attached ultrasonic (UT) sensors on all three units. Both the east and west header UT sensors are continuously connected to a recorder which is checked at 30-minute intervals.
The equipment features a local alare. A calibration check is performed each shift.
% backup sensor or manual UT surveillance by a technician is available should problems develop on the primary system.
TVA is reviewing other monitoring systems for possible semi-permanent installation. Diversity will be considered as part of this review.
Ultimately, TVA expects that the scram discharge header system will be modified such that level monitoring (other than the instrument volume) is not necessary.
We believe that the present SDV level measuring system at Browns Ferry provides adequate assurance of SDV operability.
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