05000344/LER-1981-018, Forwards LER 81-018/03L-0.Detailed Event Analysis Encl

Forwards LER 81-018/03L-0.Detailed Event Analysis Encl

ML20005B914
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	08/31/1981
From:	Yundt Cp PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20005B915	List: 05000344/LER-1981-018, Forwards LER 81-018/03L-0.Detailed Event Analysis Encl 05000344/LER-1981-018-03, /03L-0:on 810805,turbine First Stage Pressure Channel 506 Found Exceeding Limiting Setting.Caused by Instrument Drift.Instrument Recalibr
References
CPY-654-81, NUDOCS 8109160112
Download: ML20005B914 (3)

LER-1981-018, Forwards LER 81-018/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3441981018R00 - NRC Website

text

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• U Ponbnd General Electric Company Trojan Nuclear Plant P.O. Box 439 Rainier, Oregon 97048

( 03)5 W 3H 3 August 31, 1981 CPY-654-81 / ---- j\\\\ Mr. R. H. Engelken, Director [/ Q p US Nuclear Regulatory Commission Jl C 7 Region V i

• v 2f 1990 North California Blvd.

Walnut Creek, CA 94596-3783 .i x A\\ 3ar Sir: 4 ,9f In accordance with the Trojan Plant Operating License, Appendix A, US NRC Technical Specif ications, Paragraph 6.9.1.9, attached is Liceasee Event Report No. 81-018, concerning a situation where a turbine first-stage pressure channel failed a periodic setpoint test. I Sincerely, j h:% C. P. Yundt General Manager CPY/MLD:na Attachments c: LER Distribution List 5 l run::mni )J 00 :11![1 8-d3S EG OBh 0109160112 8101s31 PDR ADOCK 05000344 c

I. REPORTABLE OCCURRENCE 1. Report No.: 81-18 2. a. Report Date: August 31, 1981 b. Occurrence Date: August 5,1981 3. Facility: ' Trojan Nuclear Plant, PO Box 439, Rainier, OR 97048 4. Identification of Occurrence: During scheduled surveillance, one high steam flow channel programmed setpoint for turbine first-stage pressure was found to have exceeded the limiting setting for the 40% steam flow setpoint at 20% load (see attached curve). 5. Conditienc Prior to Occurrence: The plant was in Mode 1, power operations, at 100% power. 6. Description of Occurrence: The turbine-first stage pressure channel 506 is tested monthly per Technical Specifications Table 4.3-2. During the last scheduled test the pressure channel setpoint module was found to be out of calibration and therefore inoperable. As a result, the plant was operating with less than the minimum number of operable channels as required by the Technir.al Specifications (4.3.1.1.1 and 4.3.2.1.1). F 7. Designation of Apparent Cause of Occurrence: l The apparent cause of this occurrence is attributed to normal i instrument drift. 3. Analysis of Occurrence: This avent had no ef fect on either plant or public safety. The redundant pressure channel was operable and within specifications. f 9.

Corrective Action

[ The instrumen~. was recalibrated and the PICT was run with satisfactory results. I 4 e

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