ML19331D806

LER 80-039/01T-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

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: ML19331D802 ML19331D806
References
LER-80-039-01T, LER-80-39-1T, NUDOCS 8009030599
Download: ML19331D806 (1)

Text

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LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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7 8 9 LICENSEE COOE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 COWT lolil SOURCE l60L ]@l610 l 5 l 0 l - l 0 l 2 l 9 l 368@l690 l 8EVENT l 2 l0 0 l 8 l 074l@l750 l 8REPORT l 2 lOATE 9 l 8 l 080 l@

7 8 DOCKET NUMBER ATE 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. The product of l

o ;,; ; 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 lo is l l h** l lol7ll l 10181 I l 7 8 9 80 C DE CODE SLBC DE COMPONENT CODE SU8C O'E S E lol91 7 8 l Rl B l@ lD l@ lZ lh l Zl Zl Zl Zl 7.l Zlh W@ l Z l@

9 10 11 12 13 18 19 20

_ SEQUENTIAL OCCURRENCE REPORT REV8SION LER EVENT YEAR R EPORT NO. CCCE TYPE NO

@ sugAo aE

_ 21 l8 l0 l 22 l-l 23 l0 l3 19 l 24 26 l/l 27 M*j 28 .S W30 l-l 31 l_g_j 32 AK N AC ON O P NT VE HOURS S BP IT FOR 8. SUPPLI MANUFACT RER lG l@l Zl@ lZ l@ y@

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44 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. This- vieh I li121 the 118 Administrative limit will restrict the scram at high flux to below 120 percent i

,, ;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. I 7 8 9 80 ST S  % POWSR OTHER STATUS DIS RY DISCOVERY DESCRIPTION 11151 lE l@ l 1l 0l 0l@l N.A. l l D l@l NRC Reguest Review l C TIVITY CO TENT RELE ASED OF RELEASE AMOUNT C TlVITY LOCATION OF RELEASE S.A. l l N.A. l li 168 l9l Z l Q l10Zl@l 7 11 44 45 80 PERSONNEL EXPOSURES NUMBER l' i l 71 l 0 l 0 l 0Jl Zl TYPE @l DESCRIPTION N.A. l PERSONNE L INJU IES NUMBER DESCRIPTION li la 8l l9 0 l 0 l 0 l@l12 N.A. I 7 11 80 LOSS OF OR OAMAGE TO FACILITY TYPE DESCRIPTION li 191* 9I Z l@llo N.A. l 7

PUBLICITY 6009080 g NRC USE ONLY So DESCRIPTION

• _ ISSUE D .! j 12107 [N_jhl N.A. l 68 69 l l l l I I I I I I l l l *:

7 8 9 10 80 3 NAME OF PREPARER

. M. Thomas McLoughlin PHONE: 617-746-7900 2