ML19329B616

RO NP-33-77-05:on 770513,instrument Strings & Output Logic Channel Check Requirement of Tech Spec Table 4.3-2 Found Not Checked.Caused by Procedural Error.Shift Reading Sheets Revised to Include Channel Check Requirements

ML19329B616
Person / Time
Site:	Davis Besse
Issue date:	06/13/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19329B539	List: ML19329B538 ML19329B616
References
NUDOCS 8002050733
Download: ML19329B616 (2)

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SUPPLEMENTAL INFORMATION FOR LER NP-33-77-5 DATE OF EVENT: May 13, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The channel check requirements of Table 4.3-2 of Technical Specification 4.3.2.1.1 were not satisfied.

Conditions _ Prior to Occurrence: The plant was in Mode 6.

Descriotion of occurrence: ST 5099.01 (Shif t Channel Check) was being run when it was discovered the channel check requirements of Table 4.3-2 of Technical Specification 4.3.2.1.1 were not all being checked, specifically la " Containment Radiation High" of Instrument Strings and 2a " Incident Level One Containment Iso-lation" of Output Logic.

Designation of Apparent Cause of Occurrc ;cji: A procedural error (deficiency) was determined to have caused the non-compliance with Technical Specification 4.3.2.1.1. The procedure did not include all of the necessary channel check (N., reading sheets.

Analysis of Occurrence: Since ST 5031.01 (SFAS Monthly Test) verified that the SFAS was operable, no threat to the health and safety of the public or station personnel occurred.

Corrective Action,: Shif t Reading Sheets for Mode 6 of ST 5099.01 were revised on May 8, 1977 and May 11, 1977 to include and satisfy channel check require-ments of Table 4.3-2, Technical Specification 4.3.2.1.1.

Failure Data: No previous similar events have occurred.

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