ML19329B561
| ML19329B561 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/31/1977 |
| From: | Jonathan Evans TOLEDO EDISON CO. |
| To: | |
| References | |
| NUDOCS 8002050699 | |
| Download: ML19329B561 (1) | |
Text
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W May 31, 1977 O-TO: United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region III Attu: Tom Tambling
SUBJECT:
. Reportable Occurrence Violation of Technical Specifications - May 27, 1977 - 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> Dcvis-Besse No.1 Reactor Core - Mode 5 - Power (MWT) 0 - Load (WE) 0 Upon completion of ST 5031.02 in SFAS Channel 4, prior to replacing the cover on the Crouse-Hinds junction box, a loose output lead was discovered in the box. While tightening it, it momentarily touched the box. With the lead shorted to ground current rose rapidly simu-lating an increase in RCS pressure. HV-DH11 stroked closed at its setpoint of 433 psig. The Operator immediately tripped the decay 1
heat pump.
The insulation on the output lead had been stripped back further than necessary. Improper installation.
The short was only momentary, then the bistable was reset, HV-DH11 reopened, decay heat pump restarted, and 3000 gpm flow to the RCS re-establisted.
'd Region III, Bob Warnick, Duty Officer telephoned, May 28, at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br />.
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/ e Jack Evans Station Superintendent 1
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8002050691
me May 31, 1977 TO: United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region III Attu: Tom Tambling
SUBJECT:
. Reportable Occurrence Violation of Technical Specifications - May 27, 1977 - 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> Davis-Besse No.1 Reactor Core - Mode 5 - Power (MWT) 0 - Load (MWE) 0 Upon completion of ST 5031.02 in SFAS Channel 4, prior to replacing the cover on the Crouse-Hinds junction box, a loose output lead was discovered in the box. While tightening it, it momentarily touched the box. With the lead shorted to ground current rose rapidly simu-lating an increase in RCS pressure. HV-DH11 stroked closed at its setpoint of 433 psig. The operator immediately tripped the decay heat pump.
The insulation on the output lead had been stripped back further than necessary. Improper installation.
The short was only momentary, then the bistable was recet, HV-DH11 reopened, decay heat pump restarted, and 3000 gpm flow to the RCS re-establisted.
Region III, Bob Warnick, Duty Officer telephoned, May 28, at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br />.
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Jack Evans Station Superintendent O
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