05000298/LER-1979-014, Forwards LER 79-014/03L-0

Forwards LER 79-014/03L-0

ML19224D816
Person / Time
Site:	Cooper
Issue date:	06/08/1979
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19224D817	List: 05000298/LER-1979-014, Forwards LER 79-014/03L-0 05000298/LER-1979-014-03, /03L-0 on 790509:chamber Vent Valve for Torus Level Transmitter Was Left Closed.Caused by Technician Error.Vent Valve Opened & PC-LT-12 Placed Back Into Svc
References
CNSS790292, NUDOCS 7907170079
Download: ML19224D816 (2)

LER-1979-014, Forwards LER 79-014/03L-0

Event date:
Report date:
2981979014R00 - NRC Website

text

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f COOPE R NUL LE A R S"e A TION P.O. BO X 9 8, B R OWN V LLE, NEBR ASKA 63321 Nebraska Public Power Distr. t ic TE u ~ o~ a w a ns-u n CNSS790292 Jur.e 8, 1979 Fir.

K. V. Seyfrit U.S. Nuclear Regulatory Commission Office of Inspect.on and Enforce =ent 4

Region IV 611 Ryan Plaza Suite 1000 Arlington, Texas 76011

Dear Sit:

This report is s sitted in accordance with Section 6.7.2.B.3 of the Technical Specifications for Cooper Nuclear Station and discusses a reportable occurrence that was discovered on >by 9, 1979. A licensee event report form is also enclosed.

Report No.:

50-298-79-14 Report Date:

June 8, 1979 Occurrence Date: >by 9, 1979 Facility:

Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence:

Observed inadequacy in implementation of administrative or pro-cedural controls.

Conditions Prior to Occurrence:

The reactor was in the "Run" mode at 119 0 'L't.

Description of Occurrence:

Technical Specification Table 3.2.F was not cet, in that the ref-erence chamber vent valve for PC-LT-12 (level transmitter) was lef t closed after the co=pletion of a special test on HPCI-LS-91B (level switch) upper shutof f valve.

This caused PC-LI-12 (level indica-tor) to give a high water level indication in the torus.

The erroneous indication was noted and corrected approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after the valve had been left closed.

004 Si/j' 353 045 70071702)3757

Mr. K. V.

Seyfrit June 8, 1979 Page 2.

Designation of Apparent Cause of Occurrence:

The technician failed to open the reference chamber vent valve for PC-LT-12 af ter verifying that HPCI-LS-91B upper shutoff valve was open and free of obstruction.

Analysis of Occurrence:

Level transmitter PC-LT-12 provides one of two narrow range torus water level indications.

Two wider range torus water level indi-cations are also provided. The redundant torus level indications were operable and the torus water level was at the proper level.

Reactor Technical Specifications permit one of the redundant level indicators to be out of service for 30 days.

This occurrence presented no adverse consequences from the standpoint of public health and safety.

Corrective Action

The reference chamber vent valve for PC-LT-12 was opened placing PC-LT-12 and PC-LI-12 back inta-service.

This occurrence has been discussed with the personnel involved and a copy of the nonconformance report has been routed to all Instru-cent Technicians.

Sincerely, L. C. Lessor Station Superintendent Cooper Nuclear Station LCL:cg Attach.

353 046