05000346/LER-1977-093-03, /03L-0:on 771114,reactor Protection Sys Daily Heat Balance Check Not Completed When Station Above 15% Rated Thermal Power During Oct-Nov 1977.Caused by Personnel Error. Surveillance Test Placed on Daily Testing Schedule

/03L-0:on 771114,reactor Protection Sys Daily Heat Balance Check Not Completed When Station Above 15% Rated Thermal Power During Oct-Nov 1977.Caused by Personnel Error. Surveillance Test Placed on Daily Testing Schedule

ML19326A509
Person / Time
Site:	Davis Besse
Issue date:	12/08/1977
From:	Caba E TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A495	List: 05000346/LER-1977-093, Forwards LER 77-093/03L-0 05000346/LER-1977-093-03, /03L-0:on 771114,reactor Protection Sys Daily Heat Balance Check Not Completed When Station Above 15% Rated Thermal Power During Oct-Nov 1977.Caused by Personnel Error. Surveillance Test Placed on Daily Testing Schedule
References
LER-77-093-03L, LER-77-93-3L, NUDOCS 8002040694
Download: ML19326A509 (2)

LER-1977-093, /03L-0:on 771114,reactor Protection Sys Daily Heat Balance Check Not Completed When Station Above 15% Rated Thermal Power During Oct-Nov 1977.Caused by Personnel Error. Surveillance Test Placed on Daily Testing Schedule

Event date:
Report date:
3461977093R03 - NRC Website

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$0 EVENT DESCRIPTION AND PROCa'iLE CO' IQUENCESh 14, 1 77, it was discovered that "RPS Daily Heat Balance Check" ]

i n 121 l At 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on Nov.

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There was no danger to the health and l io,3; l 0 (6 l l safety of the public or st. c lon personnel. The overpower trip setpoint was never set i jol7l l greater than 50%, therefor the maximum reactor power could not have been exceeded.

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34 35 36 37 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE E 710NS 11 f o l IThe cause was personnel error. The "RPS Daily Heat Balance Check" was not on the i

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DAVIS-1 ESSE UNIT ONE NUCLEAR PCNER STATION SUPPLE"TNTAL INFORMATION FOR LER NP-33-77-93 I

DATE OF EVENT: Nove6er 1',

1977

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i FACILITY: Davis-3 esse Unf: 1 IDENTIFICATION OF OCCURRENjl: Reactor Protection System (RPS) Daily Heat Balance not completed above 15% Re: ad Thermal Power j

i Conditions Prior to Occur g : The plant was in Mode 1, with Power (MWT) = 900 and Load (MWE) = 370.

Description of Occurrence:

It was found at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on November 14, 1977, that Surveillance Test, ST 503t 31, "RPS Daily Heat Balance Check" was not performed above 15% thermal power at required by the surveillance requirement of Technical Specification 3.3.1.1, Tal.a 4.3-1 Note 2.

The days that the station ns above 15% power and the procedure was not completed are: October 17 to Octobe: 23 (where the maximum power reached was 17%) and October 28 to November 12 chere the maximum power reached was 32%).

The first time the heat balance cheen was performed was on November 13, 1977.

Designation of Apoarent Cau::e of Occurrence: The cause of this occurrence was per-sonnel error.

The "RPS Daily Heat Balance Check" was not on the schedule of daily testing which is sent to cperations personnel to provide a list of the testing

' required for the day. __

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel.

I;.e heat balance check is used to ensure that the overall Reactor Protection System functional capability is maintained comparable to the original de' sign standards. The overpower trip setpoint was never set at greater than 50%; therefore, the ma::hm reactor power could not have been exceeded at this time.

Corrective Action

The RPS Daily Heat Balance Surveillance Test was put on a schedule of daily testing as of November 14, 1977, and is now being done daily above 15% thermal power.

Failure Data: There have been no previous similar occurrences.

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