05000255/LER-1982-048, Forwards LER 82-048/03L-0.Detailed Event Analysis Encl

Forwards LER 82-048/03L-0.Detailed Event Analysis Encl

ML20028C147
Person / Time
Site:	Palisades
Issue date:	12/28/1982
From:	Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C148	List: 05000255/LER-1982-048, Forwards LER 82-048/03L-0.Detailed Event Analysis Encl 05000255/LER-1982-048-03, /03L-0:on 821201,w/thermal Margin/Low Pressurizer Pressure (Tm/Lp) Channel D Inoperable,Trip Signal Inserted in Tm/Lp Channel a Removed Before Declaring Channel a Operable.Caused by Misinterpretation of Requirements
References
NUDOCS 8301070113
Download: ML20028C147 (2)

LER-1982-048, Forwards LER 82-048/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2551982048R00 - NRC Website

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Consumets Power Company December 28, 1982 James G Keppler, Administrator Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - LICENSEE EVENT REPORT 82-48 (TWO TM/LP CHANNELS INOPERABLE WITHOUT A TRIP SIGNAL)

Attached please find Licensee Event Report 82-48 (Two TM/LP Channels Inoperable Without A Trip Signal) which is reportable to the NRC per Technical Specification 6.9.2.b(3).

W Brian D Johnson Staff Licensing Engineer CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement NRC Resident Inspector - Palisades

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PDR un3 1983 OC1282-0020A-NLO2 onn 46JA

Attachment to LER 82-h8 Consumers Power Company Palisades Plant Docket 50-255 Table 3.17.1 of Technical Specifications requires a minimum of two operable Thermal Margin / Low Pressuriser Pressure (TM/LP) channels.

In this minimum condition, one of the inoperable channels must be in the tripped condition.

Prior to the event, TM/LP channel D was bypassed due to a failure in a Resistance Temperature Detector (RTD). On December 1, 1982, TM/LP channel A was placed in the tripped condition and declared inoperable to trcubleshoot an erroneous reading. Following repairs and testing, the Shirt Supervisor determined that TM/LP channel A was functional and had the trip signal removed.

When this occurred, TM/LP channel A was capable of performing its safety function. Because channel A vas still considered as being inoperable due to incomplete processing of required paperwork, it should instead have remained in the tripped condition. Consequently, two TM/LP channels were adminictratively inoperable without one of them being in the tripped condition until the error was discovered by the Shift Technical Adviser during review of the operations log.

Because the TM/LP channel A was fully functional, the redundancy provided in the Reacter Protection System was never degraded.

This event is being reported in accordance with Technical Specification 6.9.2.b(3) because it threatened to reduce the degree of redundancy provided by the Reactor Protecticn System.

When the error was discovered, the required paperwork was promptly completed and TM/LP channel A was declared operable.

The event will te reviewed with all Shift Supervisors, Shift Technical Advisors and I & C Supervisors to empha-sise the need to complete all administrative requirements prior to declaring equipment operable.

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