05000366/LER-1981-027-01, /01T-0:on 810407,w/unit at Full Power,Tech Specs Max Critical Power Ratio Limiting Condition for Operation Using Option a Scram Penalty Determined Nonconservative If Heaters Out of Svc.Tech Specs Will Be Revised

/01T-0:on 810407,w/unit at Full Power,Tech Specs Max Critical Power Ratio Limiting Condition for Operation Using Option a Scram Penalty Determined Nonconservative If Heaters Out of Svc.Tech Specs Will Be Revised

ML20003F490
Person / Time
Site:	Hatch
Issue date:	04/14/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003F489	List: 05000366/LER-1981-027, Forwards LER 81-027/01T-0 05000366/LER-1981-027-01, /01T-0:on 810407,w/unit at Full Power,Tech Specs Max Critical Power Ratio Limiting Condition for Operation Using Option a Scram Penalty Determined Nonconservative If Heaters Out of Svc.Tech Specs Will Be Revised
References
LER-81-027-01T, LER-81-27-1T, NUDOCS 8104210386
Download: ML20003F490 (2)

LER-1981-027, /01T-0:on 810407,w/unit at Full Power,Tech Specs Max Critical Power Ratio Limiting Condition for Operation Using Option a Scram Penalty Determined Nonconservative If Heaters Out of Svc.Tech Specs Will Be Revised

Event date:
Report date:
3661981027R01 - NRC Website

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LICENSEE EVENT REPORT i

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8 60 68 OCCKET FM.'BER 63 b9 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CQNSEQUENCES h I O l 2 l 10n 4 81. at 1100 CST with the unit at full oower after discussions I

twith the vendor it was determined that the Tech Specs MCPR LCO limit us-- l o a 10141 ling the option A scram penalty was nonconservative if heaters were out l

O s lof service.

This is reportable under Tech Specs 6.9.1.8.h.

As the unitt 10161Iwas not operatina under conditions of the "A" oenalty. but usina the I

fBTil Imeasured scram time value no limits were approached, and there were no l

O e Iconsecuences to the plant or safety of the public. This is not a repetitive event.1 83 7

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101IThe reload analysis did not consider steady state coeration with any I

i 1 Ifeedwater heaters out of service and no McPR calculations invniving suchI i 2 loperation were performed.

The MCPR value used by the orocess computer in I l E l monitoring MCPRs has been chanced to one known to be conservative for I

i 4 lany aniticioated operation of the olant.

A Tech Specs chance will follow. !

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LER #:

50-366/1981-027 Licensec:

Georgia Power Company Facility Name:

Edwin I. IIatch Docket #:

50-366

Narrative

Report for LER 50-366/1981-027 it was 1100 CST after discussion with the vendor On 4-7-81, at determined tha_ the Unit 2 Tech Specs concerning calculation of the MCPR LCO limit assuming use of the option A scram 1 on page 3/4 2-7a) was nonconservative for

penalty,

(

heaters out of service.

Analysis

=

operation with feedwater to the reload analysis had included oper-perforned subsequentfeedwater heaters and indicated an MCPR linit of ation without reload analysis limit of 1.29 for such 1.31 as opposed to the operation.

The plant was also inforced that the option B MCPR 0 on page 3/4 2-7a), might also be noncon-value of 1.24 (

servative.

It was deemed that this crror was reportabic under

=

section 6.9.1.8.h.

The plant engineering group imacdiately raised the MCPR linit used by the process computer to 1.31, the most conservative limit indicated by analysis until just-ification of the lower values in the Tech Specs could be obtained.

A revicu of plant operating data indicated that at g

no

time, this

cycle, were any thermal limits violated or approached previous to this action.

If the presently ongoing analysis indicates that new. Tech Specs MCPR limits are required a revision will be submitted.

Also the Unit 1 Tech and reload analysis for the upcoming cycle will be Specs reviewed and corrected if needed.