ML19336A490

LER 80-029/03L-0:on 800918,discovered That Average Power Range Monitors Were Adjusted Slightly Nonconservatively.Cause Unstated.Operating Procedures Corrected

ML19336A490
Person / Time
Site:	Vermont Yankee
Issue date:	10/17/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19336A489	List: ML19336A488 ML19336A490
References
LER-80-029-03L, LER-80-29-3L, NUDOCS 8010230410
Download: ML19336A490 (1)

Text

NRC FORM 366 U. S. NUCLE AR'REGULAT@RY COMMI@32)

- [7 77) e ta (3, LtP ,EE EVENT REPORT L11.80-29/3L G'

CONTROL BLOCK: l i

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI l o 111 7 8 9 l VLICENSEE

! T lCODE V I Y l S l 1 l@l 0 lLiCENn 14 15 0 l NUVBER

- l 0 l 0 l 0 l 0 l 0 l- l LICENSE 25 0 l o TYPE l

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CON'T l0l1I 3[qj l L l@l 0 l 5 l 0 l 010 l 2 l 7+2 llMl 69 019 l1 i8 l 8 l0 l@l1 l0 74 75 ll l7 I8 l080l@

REPORT DATE 7 _8 60 61 DOCKET NUMB E R EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lol2] l T. S. Sections 2.1. A and 2.1.B require increasing APRM gains by the ratio of MTPF/A. I IO la l l Since the Design Peaking Factor (A) is based on 144 inch fuel and since our rea:: tor I

t o l4 l l contains 150 inch fuel, the potential existed that the APRM's were adjusted slightly l lOlsl lnonconservatively. Due to the ninimal nonconservatism, there were no potential con- l l 0 ls l l sequences to the health and safety of the public. No similar previous occurrences l l 0 t 7 l l have been reported. I l

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7 8 9 DE CO E $ BC DE COMPONENT CODE SLBC dE SU E l0l9l 7 8 l Z l Z l h l D lh l l' l h lZ l Zl Z! Zl Zl Zl h 9 to 11 12 13 18 19 h lZlh 20 SE OUENTI AL OCCURRENCE REPORT REVISION EVENTYEAR REPORT NO. CODE TYPE NO.

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(--j 31 W3J AK AC ON ON PL NT EH HOURS SB 1 FOR B. SUPPLI MAN FACTURER lG 33 l@lX 34 l@ l35Z l@ lZ 36 l@ l0l0l0l0l 3/ 40 l41 Nl@ l42N l@ l43 Zl@ l Z l 9 l 9 l 947l@ i 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11 l o l ] Operating procedures that imnlemented T. S. Sections 2.1.A and 2.1.B were corrected, I

[1 1il l as recommended by General Electric, to increase APRM gains by the ratio of Maximum l lil7l I Fraction of Limiting Power Dens'ty to Fraction of Rated Power (MFLPD/FRP). A l liI3l l proposed change to our T. S. was also submitted. I l

11 14 I l 7 8 9 80 STA S  % POWER OTHER STATUS IS O RY DISCOVERY DES 2RIPTION l1 15 l l E l@ l 0l 8l 7j@l NA l lD l@l Notification from NSSS l A TIVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION oF RELEASE NA l l NA l l1 l68 l9 W @ lZ 7 10 l@l 11 44 45 80 PERSONNEL EXPOSURES NUYBER TYPE DESCRIPTION NA l l 1 l 7 l l 0 l 0 l 0 l@W@l PERSONNE L INJU IES NUVBER DESCRIPTION y l0l0l0l@l NA 80 l

7 6 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION NA l 11191 8 9 12 l@l10 80 7

ISSUED DESCRIPTION Q lNl@l 7 8 9 10 NA l 68 69 lllllllllllll%*

80 5 8010&@e%,,ne,Anen _

W. P. Murphy pgoys: f(M W-W -

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