ML20148K395

RO 50-29/75-12:on 751114,calibr of Pressurizer Wide Range Level Instrument Found High Level Scram Bistable Setpoint Greater than Tech Specs Limit of 200 Inches.Caused by Instrument Setpoint Drift.Instrument Recalibr

ML20148K395
Person / Time
Site:	Yankee Rowe
Issue date:	12/12/1975
From:	Autio H, Janet Staub YANKEE ATOMIC ELECTRIC CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-29-75-12, NUDOCS 8012040442
Download: ML20148K395 (3)

Text

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YAlllWE ATOMIC E!ECTWC 00DPAllY e ,. ,f Eh>

Rowe, Massachusetts 01367

• ,9 December 12, i375t/dd -; g

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Mr. J. P. O' Reilly, Di rector U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue x'~x.~

King of Prussia, Pennsylvania 19406 ~-

Subject:

Reportable Occurrence 50 29/75-12 '

Pressurizer W.R. Level Sc' ram Instrument Setpoint Drift

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Section E.2.b. ,

the attached Licensee Event Report is hereby subr.litted.

Very truly yours, ,

h gir) 0 lb Herbert A. Autio -

Plant Superintendent JLS/jb Enclosure cc: (40) Director, Office of Inspection crid Enforcement U.S. iluclear Regulatory Commission .

Washington, D. C. 20555 (3) Director, Office of Management Information & Program Control 0.S. fluclear Regulatory Commission

--. Washington, D. C. 20555 ,

THIS DOCUMENT CONTAINS P00R QUALITY PAGES t

l 801204'O k W p 14012 i

[

s y LICENSEE EVENT REPORT. <

i CONTROL B'.0CK:l p* l l l l l [{I.EACE PRINT All. RE

.  ; 1 6 s NA E LICENSE NUMDER YE TYPE

? 01 lM l A lY l K l Rl'll l0 l0 l-l0 l 0 l 0 l Ol 0l-l0 l0 l l 4 l1 l1 l1 l1l l Ol1 l j 7 89 ,14 - 15 25 26 30 31 32

. CATEGORY TY P S E D CKET NUMDER EVENT DATE REPORT OATE-lll2111217l5l l Ol Sl0 l-101012 l 91 11 l1 11 14 l7 151 01 CorrT l l l [LJ lLl 7 8 57 58 59 EO G1 68 09 74 75 60

, EVENT DESCR:PTION

@ l During noral refueling operations a calibration of the pressurizer wide range level 'l 7 89 80 '

35 l instrument found the hich level scram histable setooint areater thar the Technical I 7 89 80 3E l Snacification lir,i t of 900 inchot This enns ti tutos a violation of Technical l

[ 7 89 80 f @ l Specification Section E.2.b.(1) and is reported as Reportable Occurrence 50-29/75-12.l 7 89 80 l

o I I 7 89 payg 80 DE C E COMPONENT CCOE MANU CU R VIOLATON

, M LI I B l [E_) li lN ISITl RI Ul lN I lWlll2l01 l Yl 7 89 10 11 iP 17 43 44 47 48 CAuSE DESCR:PTION DE lThe Westinghouse 957D633, Gr.1, Standard Bistable Assembly used for thS Pressurizer i 7 89 80 '

EUE IUide Rance Level Scram tricoed at 203 inches vice the Technical Specification limit of}

7 89 80 3 19nn in This '.'es attributed to instrument setnoint drift. The instrument was l FA0tuTY METHOO OF STATUS  % P /.'ER OTHEA STATUS 0:$00VERY DISCOVERY DESORPTON IIE lHl lol01Ol l UA I Lbj l NA l, 7 8 9 10 12 13 44 45 48

• EO FCRM OF ILE CED C AMOUNT OF ACTMTY LOCATON OF RELEASE 7 8 12 9

(Z_l LZ.]b 10 11 I 31NAl l 44 45 l NA l-80 PERSONNEL EXPCE:ES f NUMCER Tf;I CISOR PTION 1 1010l 0] lZl l NA Jl 7 89 11 12 13 80 l PERSONNEL INJUA ES Nut /eER CEs;::T :N ,

1 7 89 l 010l Ol 11 12 l ':A ll 60 i OFFSITE CONSECUENCES gg l NA ll 7 89 80 !

LOSS 04 DAMAGE TO FAC:LITY '

TYFE CESO A D l'

i3 7 89 hl 10 UA 80 PUBLICITY 1 l NA lt 7 89 80 l i

ADDiTICNAL FACTC: 6 1c l Cause Descriptic1 (cont'd): recalibrated and tested satisfactorily. ll 7 89 80 ml

? 89 W1i; NAYE. 0' h ,y A M 10NE413-625-61 @ ' i r.P 0 881.tG7 I

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' ~ NRC D(.CfRIBUTION FOR PART 50 DOCKET"rcATE * '

• (TEMPORARY FORM) -

i

. CONTROL NO: '14012 i a  :

FILE:

I FROM: Yankee Atomic Elec. Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Rowe, Mass;. - ~

H.A. Autio 12-12-75 12-17-75 XXX -

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- TO: .

ORIG CC OTHER SENTNRC POR XXX I

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J O'Reilly ' ' 0' . 40 E SENT LOCAL PDR .XXX .- i CLASS UNCLASS PROPINFO INPUT , NO CYS REC'D DOCKET NO:

XXX 40 50-29 .

_~

DESCRIPTION: ENCLOSUREC:

Letter trans the following. . . . . . . -

s Licensee Event Report # 75-12, on 11-14-72

.Concerning.a calibration of.the pressurizs

' wide range.leve,1 f.nstrument exceeding:the!

Tech. Specs....... ,, ,

(40.Cys. Received)- '

t PLANT NAME: Yankee Rowe -

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FOR ACTION /INFC RMATION sAR 1';_1R_78  !

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