05000298/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted

ML20053D619
Person / Time
Site:	Cooper
Issue date:	05/28/1982
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20053D620	List: 05000298/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted 05000298/LER-1982-009-03, /03L-0:on 820428,suppression Chamber Level Instrument PC-LI-13 Failed full-scale.Caused by Personnel Error.Ref Water Leg Drained While Collecting Torus Water Sample.Level Transmitter Replaced.Sampling Valve Tagged
References
CNSS-820284, NUDOCS 8206070132
Download: ML20053D619 (2)

LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2981982009R00 - NRC Website

text

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- 4 CNSS820284 May 28, 1982

] i-{ 6 j g g u I J]j ' WN i 1982 U-l Mr. John T. Collins, Regional Administrator L lLd) U.S. Nucitar Regulatory Commission Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Dear Sir:

This report la submitted in accordance with Section 6.7.2.B.2 of the Technical Specifications for Cooper Nuclear Station and discusses a reportable occurrence that was discovered on April 28, 1982. A licensee event report form is also enclosed. Report No.: 50-298-82-09 Report Date: May 28, 1982 Occurrence Date: April 28, 1982 Facility: Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence: A condition which led to operation in a degraded mode permitted by a limiting condition established in Table 3.2.F of the Technical Specifications. Conditions Prior to Occurrence: The reactor was operating at a steady state power level of approxi-mately 88% of rated thermal power. Description of Occurrence: During normal operation, suppression chamber level indicator PC-LI-13 was observed to be reading full scale. Designation of Apparent Cause of Occurrence: The failure of torus level indicator PC-L1-13 was due to a per-sonnel error. A chemistry technician attempted to obtain a torus water sample from the reference instrument leg instead of the high pressure tap. The loss of water in the reference leg to PC-LT-13 caused PC-LI-13 to read full scale. Ze~ % 6206070132 820528 /r PDR ADOCK 05000298 f S PDR

e Mr. John T. Collins May 28, 1982 Page 2. Analysis of Occurrence: Torus level is-monitored by four independent level indicators and two level switches. There are three narrow range level indicators and a wide range level recorder. Alarms are provided from two of the level indicators and from the two level switches. PC-LI-13 is one of the three narrow range level indicators from torus level and does not provide an alarm. At the time of this occurrence, torus level was normal and all other indicators and alarms were func-tioning properly. This occurrence presented no adverse consequences from the stand-point of public health and safety. i ^

Corrective Action

The instrument reference leg was backfilled. Level transmitter PC-LT-13 continued to stick at the full scale position so the trans-mitter was replaced. The proper valve to be used for obtaining a torus water sample has been tagged. The proper method for ob-taining a torus water sample has been discussed with all chemistry technicians. Sincerely, m L. C. Lessor Station Superintendent Cooper Nuclear Station LCL:cg Attach. 9 1 1 e }}