ML20084E365

Ro:On 730606,high Bistable Setting Approx 2.1% Higher than Specified Value Set Forth in Plant Procedure.Caused by Personnel Error in Transposing Desired Calculated Current Level from Work Sheet.Setting to Correspond W/Steam Flow

ML20084E365
Person / Time
Site:	Ginna
Issue date:	06/07/1973
From:	Platt C ROCHESTER GAS & ELECTRIC CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8304150036
Download: ML20084E365 (3)

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ROCHESTER CA$ AND ELECTRIC CORPORATION e Of EAST AYENUE, ROCNESTER.'N.Y.14649

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..i. ... ses a7oo TELECOPY Cinna Station .i June 7, 1973 .

Mr. James P. O'Reilly, Director _

Region 1, Division of Compliance -

USAEC 970 Broad St.

Newerk, N.J. 07102

Dear Mr. O'Reilly:

Because of recent reports received at Cinna Station concerning incorrect High Steam Flow bistable settings for Main Steam Line Isolation Valve Logic at *

'other Nuclear Plants, our Instrument and Control Foreman reviewed the Cinna  !'

, Station High Steam Flow and High High Steam Flow bistable settings.

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This check on 6/6/73 indicated that the High High. Bistable setting was .

l approximately'237. higher than the specified velds as set forth in the Plant P-1, (Reactor Control and Protection System Settings) procedure. A High Righ Steam Flow from a Steam Generator in conjunction with a safety Injection signal ,

will result in an isolation closure signal for the respective Main Steam Line

Isolation valve. ,

1 The apparent reason for this incorrect bistable setting was due to a personnel error in transposing the desired calculated current level from a work sheet to the Plant's PT-5, (Reactor Protsetion Systen Bistable Surveillance Test) procedure. ,-

At the outset of our preparation to attain stretch power level (1520 MWt), the .

Plant was shut down in early March,1972 to incorporate the Westinghouse ,

recommended protection setpoint changes. One of SteamFlovequaltoadeltapressureof3.78x10ghesechangeswasHighHigh, #/hr. The station Instrummate and Control Department thought that this was too high, as it cortesponde ~

essentiaglytothemaximumrangeoftheSteamflowmeasuringcapahilityof

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3.8 x 10 #/hr. Upon mutual agreement between Rochesiter Can and' Electric and ~

Westinghouse, a setpoint. of 3.7 x 106 #/hr was decided upon, and it- is this ,

value that is listed in the Plant P-1, (Reactor Control and Protection Setpoint)

• procedure. Inadvertently the Delta Pressure Equivalent signal. fur. the originally .-

proposed setpoint setting (3.78 x 106 N/hr ' steam flow) .w'as set into the High '

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8304150036 730607 I n DR ADOCK 05000244 '

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TELECOPIER.

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.o I June 7, 1973 Gintia 5tacion L-i ..

i Ihe Plant Operations Review Connittee met on 6/6/73 and reviewed the probles..

They concurred that there were no safety implication involved due 1:e the higher:

than desired bistable setting.. This conclusion is based upon the fact that the actual histable trip point was equoi to the Westinghouse Safety Analysis Group's 6 first proposed valus.

The Plant Operations Revi Consmittee recommended that the bistable setting corresponding to 3.7 x 10gw#/hr Steam Flow be set in the 4 High High Steam Flow Bistables (2 in each loop). This was completed by 1500 on 6/6/73..

Charles E. Platt-Superintendent CEP: jab cca K.'Amlah C. Green.

C. Swarthout- -

L. White-R. Koptouski. -

J. Arthur :

L. Lang.-

G. Paris s-C. Hart 11eb A

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MEMO 110VTE SLIP 5" 'ae a 6*t th+ ro, con e .. r., .ciion.

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$ e.am. .nd c..) i= Tiats ReMans Licensce: Rochester Gas & Electric Corporation i /

,.X, u . unornburg, oArc Docket No.: 50-_244 Chief, FS&EB Abnormal Occurrence: Report dated 6/7/73 To (Name and emt) INiilALS .d ARK 5

, RO:IIQ (5)

DR Central Files (1) om The attached report +- .a. the subject licensee is Regulatory Standards :3)

Dir. of Licensing (131 TO (Name and unit) forwarded in accordance with R0 Manual chanter 1000.

INitAd REMARKS The action taken by the licensee is considered

• n appropriate. Followup will be perfomed during the next inspection n's appropriate. copies of F ROM (Narne and unet) REMARKS

.; the report have been fortnrded to the PDR, Local

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Gl . . / , PDR, NSIC, DTIE and State representatives. The R. T. Carlson, RO:I licenses will submit a 10 day written report to PHOh( h(k oATL 6/7/73 Licensing.

V4 OTHtR $1[1 FOR ADDITIOMaL RLMARK$ . CIU : 1911 0 - 445 46, "Y

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