ML19317F402
| ML19317F402 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/17/1977 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F399 | List: |
| References | |
| RO-270-77-03, RO-270-77-3, NUDOCS 8001140651 | |
| Download: ML19317F402 (1) | |
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Report'No'.:.RO-270/77-3 i
- Report Date_: cMarch 17, 1977 Occurrence Date: ' February.15,-1977 L 0conee Unit 2, Seneca, South Carolina Facility:_
Reactor Building pressure transmitter
~ Identification of Occurrence:
out of calibration
-Unit 3! 100 percent full power
' Conditions Prior to Occurrence:
Description of Occurrence:
while-performing a comparison of readings on the 15, 1977, On February ~
three Reactor Building narrow range pressure transmitters, a difference-
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Investigation revealed that Reactor Building of 0.6' psi was noted.
narrow range pressure transmitter Channel 2 2BS4-PT2, was set less conservative than the'setpoint specified in Oconee Technical Specifica-The pressure transmitter was promptly'recalibrated to the tion 2.3.
required specifications.
Apparent Cause of Occurrence:
Examinations of E The cause of this inci kat has not been determined.
the Reactor Building pressure transmitters ~were made periodically over a one week' span of time to determine if the transmitters were experienc-
.ing drift'but no-indications-of-setpoint drift were found.
Analysis of Occurrence:
'The. Reactor Building pressure is sensed by three redundant pressure trunsmitters which provide inputs to the Engineered' Safeguards (ES)
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h l ~being set
, system...This incident resulted in;one of the three c anne s i d
--slightly. less conservative et 5.6 psi rather than at 4 psi as requ re The two redundant channels of by Oconee Technica1' Specification 2.3.
the Reactor Building pressure transmitters assure tnat the ' required
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It is therefore
{ inputs-to the ES system.would have been' supplied.
considered:that;the health'and safety of the public were not affected JbyJthis occurrence.
Corrective-Action:
~
The Channeli2 Reactor Building pressure transmitter was recalibrated to A check of all three pressure transmitters ithe'requirad specifications.
- wasi made'and the~ Reactor Protective System'setpoints were verified to ube within~ Technical Specifi:ation limits.
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. Examinations of f the :three jeacter Building pressure transmitters were iperiodicallyLmade over' a one week time span to ' determine.if the :trans-mitters werejexperiencing any drift..'No; evidence of setpoint. drift was a
" discovered. L ' No1 further -corrective " action is considered necessary.
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