ML20148K395

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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)


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YAlllWE ATOMIC E!ECTWC 00DPAllY

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Rowe, Massachusetts 01367

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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

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LICENSEE EVENT REPORT. <

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,14 - 15 25 26 30 31 32 CATEGORY TY P S

E D CKET NUMDER EVENT DATE REPORT OATE-01 CorrT l l

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[LJ l L l l Ol Sl0 l-101012 l 91 11 l1 11 14 l7 151 lll2111217l5l 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

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

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l 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

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LOSS 04 DAMAGE TO FAC:LITY TYFE CESO A D hl UA l'

i3 7 89 10 80 PUBLICITY 1

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ADDiTICNAL FACTC:

6 1c l Cause Descriptic1 (cont'd): recalibrated and tested satisfactorily.

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NRC D(.CfRIBUTION FOR PART 50 DOCKET"rcATE

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CONTROL NO:

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I FROM: Yankee Atomic Elec. Co.

DATE OF DOC DATE REC'D LTR TWX RPT OTHER Rowe, Mass;.

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

ORIG CC OTHER SENTNRC POR XXX I

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CLASS UNCLASS PROPINFO INPUT,

NO CYS REC'D DOCKET NO:

XXX 40 50-29

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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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