05000366/LER-1980-074-03, /03L-0:on 800427,core Max Fraction of Limiting Power Density Found in Excess of Tech Spec.Cause Not Stated. Average Power Range Monitor Adjusted,Power Reduced & Process Computer Updated,Run & Verified

/03L-0:on 800427,core Max Fraction of Limiting Power Density Found in Excess of Tech Spec.Cause Not Stated. Average Power Range Monitor Adjusted,Power Reduced & Process Computer Updated,Run & Verified

ML19323F237
Person / Time
Site:	Hatch
Issue date:	05/15/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323F226	List: 05000366/LER-1980-074, Forwards LER 80-074/03L-0 05000366/LER-1980-074-03, /03L-0:on 800427,core Max Fraction of Limiting Power Density Found in Excess of Tech Spec.Cause Not Stated. Average Power Range Monitor Adjusted,Power Reduced & Process Computer Updated,Run & Verified
References
LER-80-074-03L, LER-80-74-3L, NUDOCS 8005280683
Download: ML19323F237 (2)

LER-1980-074, /03L-0:on 800427,core Max Fraction of Limiting Power Density Found in Excess of Tech Spec.Cause Not Stated. Average Power Range Monitor Adjusted,Power Reduced & Process Computer Updated,Run & Verified

Event date:
Report date:
3661980074R03 - NRC Website

text

NRC FOPM 366 U.S. NUCLEAR REGULATORY COMMISSION 87 77)

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IO Til 60 61 DOCKET NUMfi(R 68 69 EVENT DATE 74 75 REPORT DATE 80 i

6 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo121lAt 1353 CST on 4-26-80, while operating at approximately 63% power, l

io i3i.l CMFLPD was calculated by the process computer to be.678.

The APRMs l

io 141 Iwere adjusted to compensate for CMFLPD being greater than fraction of l

[o # si t rated thermal power.

Later power was reduced to approximately 40% to l

101a 1 l allow repairs on the MSRs.

CMFLPD was no't calculated at the level until l t o l 71 l 0722 CDT.

This is in violation of Tech Specs 3.2.2.

There were no ef- !

l Oia i l fects to public health or safety.

This is not a repetitive occurrence. l 80 7

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40 di 42 43 44 47 CAUSE DESCRIPTloN AND CORRECTIVE ACTIONS h li lo t l When power was reduced, the process computer periodic _ thermal limit ev-l lilillaluation was suspended.

At 0600 CDT it was discovered that at 0153 CST I g i the twelve hour limit on calculating CMFi.PD had ;;assed.

Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> l [i: 3rIof discovery, the process computer was updated, run, and CMFLPD was l

g iverified to be below FRCTP.

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LER 4:

50-36'6/1980-074 l

Licensee:

Georgia Power Company Facili ty Name:

Edvin 1.

'i n t e h Docket 1:

50-366*

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. Narrative Report for LER 50-366/1980-074 i

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1 AT 1353 CST, on 4-26-80, while operating a *. noproximately 63 j

percent and increasing power following a saintenance outage, the process computer calculated Core

'faximum Traction of 1

i Limiting Power Density ( C'4 F L P D ) to bc

.673.

At 1419 C9' of j

the same dgy, the APR'is were adjusted to compensate for this as per Tech Specs 3.2.2.

Fo l l otti ng this, power was reduced to app-oxima t el y 40 percent l

to allow repairs to be performed on unrelated plant i

equipment.

During this reduction,-

the process computer

^

periodic thermal limit evaluation program, P1, nas prevented j

t from running.

At 1600 CDT, on 4-27-80, it wes discovered that Ctf ? ton wa s not calculated by 0153 CST as required by "'ech specs for a CurLPn being higher than the Fract ion of Rated Core Thermal power (FRCTP).

This is a violation of Tech Specs 4.2.2.

I Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of discovery an OD-1 (L?RM Calibration and Base Distribution Updatei was performed, the process computer program P1 run, and CMPLPD v'e r i f i e d to be below WRCTP.

FR C'P P uns.401 and CstFLPD was.388 at 0722 COT.

This brought the unit into compliance with Tech Specs.

"ersonnel will be instructed as to correct action to be t sine n in the future.

This is not a repetitive occurrence.

There was no inpact from this incident on fin i t 1.

There were no e Fe c t s upon public health and safety due to this event, i