ML20084H908
| ML20084H908 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/21/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084H906 | List: |
| References | |
| AO-BFAO-7416W, NUDOCS 8305060137 | |
| Download: ML20084H908 (3) | |
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h TENNESSEE VALLEY AUTHO AITY E7T\\ ' /h.
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3 ANN EASAAY March 21, 1974 259 A
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Mr. John F. O' Lee f, Director i
Directorate of Licensing Office of Regulation U.S. Atomic Energy Co=:lission Washington, DC 20545 1
Dear Mr. O' Leary:
TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR FLANT UNIT 1 -
DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR ABNORMAL i
OCCURRENCE REPORT BFAO-7416W i
The enclosed report is to provide details concerning HPCI failure which occurred on Browns Ferry Nuclear Plant unit 1 on March 12,1974, and is submitted in accordence with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973 Very truly yours, A.K o
TENNESSEE VALLEY AUTHORITY
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i E. F. Thomas e-Director of Power Production EN, k s.
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,,'f Mr. Noman C. Moseley, Director Region II Regula tory Operations Office, USAEC 230 Peachtree Street, NW., Suite 818 i
Atlanta, Georgia 30303 I
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ABNORMAL OCCURRENCE REPORT -
Deport No.: BFAO-7kl6W.
Report Date: Zerch 21, 1974 0ccurrence Date: ferch 12, 1974 Flacility: Browns Ferry Nuclear Plant unit 1 Identification of Occurrence
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HPCI. failure.
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' Conditions Prior to Occurrence The reactor was operating at 1,533 !Wt.
j Descriotion of Occurrence At approximately 3:00 p.m.,
the HPCI turbine failed to reach rated speed and flow during surveillance testing. The auxiliary oil pump was cycling on and off at the same time the turbine was losing speed.
Designation of Aomrent Cause of Occurrence The apparer.t eense of the failure was the inability of the governor to respond when an increase to speed was called for. The maximum signal obtainable for an incresce in speed from the ECM control box to the governor actuator was only 4 percent of what it should have been. The response was nomal for a decrease in speed.
Analysis of Occurrence Safe shutdown of the reactor would have been possible because the remaining core cooling systems were operable. - Required surveillance testing was conducted after the failure and all systems proved operable.
.Correetive Aetion An investigation was conducted.to ensure.that the oil system was functioning properly. No abnomalities were found. The ECM control box was replaced and celibrated. The.HPCI was tested and met acceptance criteria. The cause of-the ECM control box failure is being investigated.
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- Failure Data A previous failure to the HPCI ECM control box was reported in BFAO-71+7W.
That. failure was caused when the signal to the ECM control box ves shorted by external test leads. The ECM control box, part number 8270-811, is manufactured by Woodward Governor Corporation.
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