ML20196A011

Special Rept:On 880114,Channel a Narrow Range Containment Water Level Declared Inoperable.On 880115,narrow Range Level Instrument Not Restored to Operable Status.Cause Cannot Be Identified During Plant Operation.Repairs Planned

ML20196A011
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/29/1988
From:	Olmstead C PORTLAND GENERAL ELECTRIC CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CAO-046-88, CAO-46-88, NUDOCS 8802040220
Download: ML20196A011 (1)

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Portland General Electric Company Trojan Nuclear Plant January 29, 1988

.71760 Columbia River liwy CAO-046-88 Rainier, Oregon 97048 (503) 556-3713 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Gentlemen:

Special Report Limiting Condition for Operation (LCO) 3.3.3.9 of the Trojan Technical Specifications requires submittal of a follow-up Special Report within 14 days if less than the minimum number of post-accident monitoring instrur.entation channels shown in Technical Specification Table 3.3-11 are operable. On January 14, 1988, the channel "A" narrow range containment water level instrument was declared inoperable. The instrument would not accurately track containment water level as indicated on the associated wide range containment level instrument and the containment sump level indicating lights on Panel C-151.

On January 15, 1988, it was concluded that the narrow range level instrument could not be restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. In accordance with LCO 3.3.3.11, an alternate method of monitoring containment sump "A" narrow range level was established using the containment sump level indicating lights on Panel C-151. This alternate method consists of six switch-actuated lights to provide indication at six discrete levels in the containment sump. Notification of the instrument's status and our actions was provided to the Nuclear Regulatory Commission on January 15, 1988, by telephone and Special Report.

The containment narrow range water level instrument is located in containment in an area with high radiation dose rates. Trouble-shooting to identify the cause of the inoperable instrument cannot be performed during plant operation due to the high dose rates. We plan to troubleshoot and repair the inoperable containment water level instrument when the plant is shut down for the 1988 refueling outage.

Sincerely, 8802040220 880129 gDR ADOCM o 4 g C. A. Olmstead General Manager CA0/RPS/ /LAH:sg c: Mr. Dave Yaden, Director Mr. R. C. Barr State of Oregon Department of Energy USNRC Resident Inspector Trojan Nuclear Plant

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Mr. John B. Martin Regional Administrator Distribution gO US Nuclear Regulatory Commission

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