ML20004D566
| ML20004D566 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/05/1981 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20004D560 | List: |
| References | |
| LER-81-016-01T, LER-81-16-1T, NUDOCS 8106090537 | |
| Download: ML20004D566 (2) | |
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""cro" h , Update R2 port - Prsvious Report Data 5/12/81 U. S. NUCLE AR REGULATORY COMMISSION LICENSEE EVENT REPORT o
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/ 3 DATE EVENT DESCRl* TION AND PROBABLE CONSEQUENCES h l o l 2 l l During post-modification tests on a new sprinkler system. the fire oumo automatic I go l3; l start logic was found inoperable. T.S. 3.11..A.l.b requires operable logic. One fire I
.[ o l 4 ; Ipump was running at the time the inoperability was discovered. The pump was kept l I
io ls; l running while the automatic-start circuit was repaired. Manual start capability ]
Io is ] lwas operable. Units 1, 2, and 3 were affected. There was no danster to the health l lolij jor safety of the public. There are no redundant systems. There were no previous I iojg; lsimilar events. I i a9 80 JYSTEM CAUSE CAUSE COMP. VALV E CODE CODE SUSCODE COMPONENT CODE SUSCODE SU8 CODE mp el i A l B10 l@ l A l@ l X l @ l Z ] Z l Z l Z l Z l Z l@ [Z_J @ [Z_l 9 11 12 13 18 19 20
_ SEQUEN TI AL OCCURRENCE REPORT REVISION LERiRO EVENT YE4R REPORT No. CODE TYPE N O.
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JJ J4 JS 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lijoll Wiring was removed from terminal points in main relay panel 52, interrupting power to I g,i,j l fire pump auto-start circuit, probably while performing a modification in the canel. I
,,,,,g P ermanent wire was replaced immediately. Workplan was revised to caution electriciansI g lco consult with cognizant engineer prior to removing existing wiring. [
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NAME OF PREP ARER PHONE:
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~ Tcnnessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 3/24/81 LER SUPPLEMENTAL INFORMATION BFRO 259 / 81016 R1 Technical Specification Involved 3.11.A.l.b Reported Under Technical Specification 6.7.2.a(2)
Date of Occurrence 5/8/81 Time of Occurrence 1550 Unit 1, 2, and 3 Identification and Description of Occurrence:
Power (120V AC preferred) lifted to fire pump auto-initiation. The exact duration the circuit had been inoperable could not be determined. However, it is probable that the wiring was removed during the modification activity, making the duration 2 weeks ur less.
Conditions Prior to Occurrence:
Unit 1 refueling outage.
Unit 2 at 99%.
Unit 3 at 100%.
Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.
Reterminated power supply.
Apparent Cause of Occurrence:
Wiring was removed from terminal points in main relay panel 52 resulting in the interruption of power to the fire pump auto-start circuit. Although it could not definitely be determined how the wiring was removed, it is suspected that the wires were removed during performance of a molification in tne panel.
Analysis of Occurrence:
There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and n) resulting significant chain of events.
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l Corrective Action:
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Replaced permanent wiring immediately. Precautions have been added to the l workplan requiring the electricians to consu'; the cognizanc engineer prior to removing any existing wiring.
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Failure Data:
Notic
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- Retention . Period - Lifetime; Responsibility - Document Control Supervisor
- Revision: -
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