ML19338D961
| ML19338D961 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/29/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-17, NUDOCS 8009240261 | |
| Download: ML19338D961 (3) | |
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TENNESSEE VALLEY AUTHORITKRC RD1,...
CHATTANOOGA. TENNESSEE 374ot ' A II4, 7 *.
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400 Chestnut Street Tower II M SEP8 nig; ; ;
August 29, 1980 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 INSP jECTIED ENFORCEMENT BULLETIN 80-17, SUPPLEMENT 3 - RII:JP0dU-259, -260,
-P,Sf>'- BROWNS FERRY NUCLEAR PLANT Your letter dated August 22, 1980, to H. G. Parris transmitted IE Bulletin 80-17, Supplement 3 for TVA action. Enclosed is our response to the subject bulletin. If you have any questions, please call Jim Domer at FTS-857-2014 Very truly yours, TENTESSEE VALLEY AUTHORITY arry M. ' Mill, Manager Nuclear Regulation and Safety Subscribed and swornf o before me this 42-Why of//44 AA980.
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Enclosure cc: Office of Inspection and Enforcement (Enclosure)
U.S. Nuclear Regulatory Coc: mission Division of Reactor Operations Inspection Washington, DC 20555 8009240
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ENCLOSURE RESPONSE TO OIE BULLETIN 80-17, SUPPLEMENT 3 BROWNS FERRY NUCLEAR PLANT FAILURE OF CONTROL RODS TO INSERT DURING A SCRAM AT A BWR ITEM 1.a. For those plants in which the scram discharge volume headers are connected to the instrunent volume by a 2-inch pipe, within five days of the date of this Bulletin, provide or verify that Drocedures are in effect to:
a.
Require an immediate manual scram on low control rod drive air pressure with a minimum 10 psi margin above the opening pressure of the scram outlet valves.
RESPONSE TO ITEM 1.a.
Plant instructions were changed on August 27, 1980, to provide for a manual scram in the event that scram pilot air header pressure drops to 60 psig.
This is 10 psig above the opening pressure of 50 psig for the scram outlet valves. The opening pressure is conservative based on information provided by General Electric and tests performed by other utilities.
ITEM 1.b. Require an immediate manual scram in the event of:
(1) Multiple rod drift in alarms, or (2) A marked change in the number of control rods with high temperature alarms.
RESPONSE TO ITEM 1.b.
llant instructions were changed on August 27, 1980, to provide for a manual scram should either of these two events occur.
l ITEM 2.
In addition, every BWR license is required within five days of the date of this Bulletin to provide and implement procedures which require a functional test using water for the instrument volume j
level alarm, rod block and scram switches after each scram event, j
before returning to-power. This procedure should remain in effect until modifications in addition to Item B.1 of IEB 80-17 supplement No. I are completed to substantially increase reliability of water level indication in the scram discharge volume (s).
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~8-RESPO?iSE TO ITEM 2 Plant instructions were changed on August 27, 1980, to provide for this functional test.
It should be noted that functional testing of these switches on unit 3 has resulted in a dose of 75 - 150 man-mrem per test. Dose rates
'for units 1 and 2 will be higher. Based on past operatina experience at Browns Ferry unit 3, this results in an increased exposure of at least 3.75 - 7.5 man-rem per year.
f'ANPOWER REQUIRED FOR CORRECTIVE ACTION /TiEPORTING As requested cy the subject bulletin, in order to assist the NRC in evaluating the value/ impact of each bulletin, the msnpower required to review and prepare the report as well as perform the necessary corrective actions are provided below:
(a) Review / Prepare Response - Approximately 20 man-hours (b) Corrective Actions - Approximately 15 man-hours (but does not include man-hours required for functional testing).
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