ML20085G343
| ML20085G343 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/12/1973 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20085G349 | List: |
| References | |
| AO-BFAO-7320W, NUDOCS 8308240857 | |
| Download: ML20085G343 (2) | |
Text
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TENNESSEE VALLEY AUTHOFilTY M]s '
CHATTANOOGA, TENNESSEE 37401 b' A
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October 12, 1973 8
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'C&kY Mr. John F. O' Leary, Director p pou M
M Directorate of Licensing gut 5" Office of Regulation
[d U. S. Atomic Energy Commission p
Washington, DC 20545 w
Dear Mr. O' Leary:
TENNESSEE VALLEY AUTHORITY - BROWUS FERRY NUCLEAR PIAIiT UNIT 1 -
DOCKET NO. 50-259 - FACILITY OPEFATING LICENSE DPR ABNOT0:AL OCCURRENCE REPCRT BFAO-7320R The purpose of this report is to provide details concerning events involving unit 1 control rods 54-27 and 26-55 at Browns Ferry nuclear Plant on Octcber 3 and 4, 1973. This occurrence was reported by telegram on October 4,1973, to the Region II Directorate of Regulatory Operations, Atlanta, Georgia.
l Descrittien of the Incident Control rod drive 54-27 was valved out to replace a scram outlet valve seat at 9:00 a.m. on October 3 in a fully withdrawn insequence conditicn. At 8:51 a.m. on October 4, it was fully inserted.
Throughout thn time, control rod drive 54-27 could have been valved in and inserted if required.
Control rod 26-55 was in a fully withdrawn insequence conditica at 5:15 a.m., on October 4, when it was determined the rod wculd I
not move with normal CRD pressure. After raising CRD pressure, it was inserted at 10:30 a.m. on October 4.
The plant was operating at less than 8-percent power at less than or equal to rated temperature and pressure.
Investigation and Corrective Action The occurrence was reviewed by the Startup Coordination Committee about 8:30 a.m. on October 4.
In review of the situation with respect to technical specification 3 3/4.3.A, it was decided that control rod 54-27 should be valved in and fully inserted and that
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Mr. Jchn F. O' Leary October 12, 1973 TENITESSEE VALLEY AUTHORITY - BRGTIiS FERRY NUCLEAR PLUIT UNIT 1 -
DOCKET UO. 50-259 - FACILITY OPERATIEG LICENSE DPR AEHORMAL OCCURREHCE REPORT BFAO-732CW efforts should centinue to fully insert control rod 26-55 as soon as possible. After raising CRD pressure, control rod 26-55 was inserted.
Study of this occurrence is not ecmpleted.
It is under centinuing review by members of the Plant Operations Review Cc=mittee, the manufacturer's representatives, and the Safety Review Board.
Until this study is ccmplete, a violation of technical specification 3 3.A.1 is assumed te have occurred; and written instructicna have been issued to require any incperable control rod to be fully inserted or the reactor placed in a shutdown condition unless it can be inmediately determined that technical specification 3 3.A.1 is satisfied.
The strainer for drive water to control red 26-55 was cleaned.
This rod was then tested and returned to normal service.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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~ <5 E. F. Ahemas c'
Directcr of Pcwer Production i
CC:
Mr. Norman C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Feachtree Street, IM.
Atlanta, Georgia 30303
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