05000293/LER-1980-039-01, /01T-0:on 800820,calibr Techniques for Limiting Safety Sys Setting & for Average Power Range Monitor Found to Be Nonconservative.Cause Unstated.Interim Administrative Limits Established Pending Final Guidelines

/01T-0:on 800820,calibr Techniques for Limiting Safety Sys Setting & for Average Power Range Monitor Found to Be Nonconservative.Cause Unstated.Interim Administrative Limits Established Pending Final Guidelines

ML19331D806
Person / Time
Site:	Pilgrim
Issue date:	08/29/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19331D803	List: 05000293/LER-1980-039, Forwards LER 80-039/01T-0 05000293/LER-1980-039-01, /01T-0:on 800820,calibr Techniques for Limiting Safety Sys Setting & for Average Power Range Monitor Found to Be Nonconservative.Cause Unstated.Interim Administrative Limits Established Pending Final Guidelines
References
LER-80-039-01T, LER-80-39-1T, NUDOCS 8009030599
Download: ML19331D806 (1)

LER-1980-039, /01T-0:on 800820,calibr Techniques for Limiting Safety Sys Setting & for Average Power Range Monitor Found to Be Nonconservative.Cause Unstated.Interim Administrative Limits Established Pending Final Guidelines

Event date:
Report date:
2931980039R01 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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7 8 9 LICENSEE COOE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 COWT lolil l L ]@l 0 l 5 l 0 l - l 0 l 2 l 9 l 3 @l 0 l 8 l 2 l 0 l 8 l 0 l@l 0 l 8 l 2 l 9 l 8 l 0 l@

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8 60 61 DOCKET NUMBER 68 69 EVENT 0 ATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h Iol2l l A review of calibration techniques for determining the LSSS of 107 percent for a l

g,3 ; ;

Rod Block and 120 percent for a APRM Scram were nonconservative.

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Instrument tolerance limits permitted by procedure prior to recalibration would l

loisl l have allowed the setpoint to drif t beyond the required Technical Specification l

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REV8SION LER EVENT YEAR R EPORT NO.

CCCE TYPE NO

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l Administrative changes are in ef fect to limit the AGAF to eaual to or less than unitv.l l1 Iil twhile the basis for the original limits of +.05 of unity are evaluated.

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the 118 Administrative limit will restrict the scram at high flux to below 120 percent i li121

,, ;3g ;of rated power at all times. This interim measure will be re-evaluated once a concise]

g,,,,; understanding of the basis has been established.

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% POWSR OTHER STATUS DIS RY DISCOVERY DESCRIPTION 11151 lE l@ l 1l 0l 0l@l N.A.

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8 9 10 11 44 45 80 PERSONNEL EXPOSURES l i l 71 l 0 l 0 l 0Jl TYPE @l DESCRIPTION NUMBER Zl N.A.

l PERSONNE L INJU IES NUMBER

DESCRIPTION

li la l l 0 l 0 l 0 l@l N.A.

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8 9 11 12 80 LOSS OF OR OAMAGE TO FACILITY TYPE

DESCRIPTION

N.A.

l li 191 I Z l@l 6009080 g

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• 9 lo PUBLICITY NRC USE ONLY

_ ISSUE D

DESCRIPTION

j 12107 [N_jhl N.A.

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7 8 9 10 68 69 80 3 M. Thomas McLoughlin 617-746-7900 2

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