05000260/LER-1981-029-03, /03L-0:on 810621,flow Bias Loop a Drifted High, Affecting Average Power Range Monitors A,C & E & Rod Block Monitor A.Caused by Electronic Failure of GE Model 563-02 Flow Totalizer.Flow Totalizer Replaced

/03L-0:on 810621,flow Bias Loop a Drifted High, Affecting Average Power Range Monitors A,C & E & Rod Block Monitor A.Caused by Electronic Failure of GE Model 563-02 Flow Totalizer.Flow Totalizer Replaced

ML20009C738
Person / Time
Site:	Browns Ferry
Issue date:	07/16/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C734	List: 05000260/LER-1981-029, Forwards LER 81-029/03L-0 05000260/LER-1981-029-03, /03L-0:on 810621,flow Bias Loop a Drifted High, Affecting Average Power Range Monitors A,C & E & Rod Block Monitor A.Caused by Electronic Failure of GE Model 563-02 Flow Totalizer.Flow Totalizer Replaced
References
LER-81-029-03L, LER-81-29-3L, NUDOCS 8107210413
Download: ML20009C738 (2)

LER-1981-029, /03L-0:on 810621,flow Bias Loop a Drifted High, Affecting Average Power Range Monitors A,C & E & Rod Block Monitor A.Caused by Electronic Failure of GE Model 563-02 Flow Totalizer.Flow Totalizer Replaced

Event date:
Report date:
2601981029R03 - NRC Website

text

U. S. NUCLEA7 RE!ULATZY COMMISSION NkC F RM 366

. (7 71)

LICENSEE EVENT REPORT CONTROL GLOCK: l l

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l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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F n 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T

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H 60 61 DOCKET NUMBER 68 69 EVENT DATE le 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBAB' E CONSEQUENCES h l o ( 2 l l During normal operation at 100 percent recirculation flow, the "A" flow bias loop l

io la l ] drifted high (to 110 percent). Th h affected APRM "A",

"C",

"E", and rod block l

lO141Iconitor "A".

(see T.S. 2.1.A and T.S. 2.1.B).

The 120 percent scram clamp was in l

I o l s l l ef fect. The flow bias drif t affected only scram point and rod blocic below 100 percent l 10161 I power for channel A (reference T.S. Figure 2.1-1).

There was no danger to the j

I t o l i j l health or eafety of the public, and no previous similar events.

l IOjHl l 80 SYSTEM

CAUSE

CAUSE COMP.

vat,VE CODE CODE SLOCODE COMPONENT CODE SUSCODE SURCODE l Cl B lh [,Ej@ l C l@ l Il Nl Sl Tl Rl Ulh W@ l Z l@

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9 10 11 12 13 18 19 20 SEQUENTI AL OCCUR RE NCE hEPORT R EVISION u p. gig,

EVENT YE4H REPORT NO.

CODE TYPE NO.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS LJlo.J l The General Electric Model 563-02 (10-50 ma) flow totalizer faP_ed electronically.

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l1 l1l lThe flow totalizer was reolaced. the functionni test of flow M as (RT 4.2.c-7. Soc H nn i I

iTTT1 14) was successfu11v ocrformed and the system retumed to service within 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

l I i Ill l This is considered a random f ailure and no recurrence contial is reaufred.

l It 141 1 80 r

8 9 STA S

% POWER O D4ER STATUS dis O RY DISCOVERY DESCRIPTION J

la101 Operator observed l

l1 15l dh [,,,,0l Ql Ol@L NA AC TIVIT Y CONTENT RELE ASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l

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M 11 12 10% OF Cn DAMAGE TO F ACILITY fyPE DE SCF4t P TION l

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NAME OF PREPARER pggyg g

iennessee Val'ey Authori:*e T!orm BF 17 1:rowns Ferry Nuclear Plaut BF 15.2 6/04/81 1.El: St!1*i'I.lD1 ENTAL. IN Ft sl01 ATION B Fito.50-269 / 81029 T.. httical Specif ic.stion invo!ved 2.1.A and 2.1.3-liep >rted 11ntler Technical Sp. eification 6.7.2.n.2.

• !) ate due NRC: 7/21/81 _

lhte of Occurrence 6/21/81 Time of Occurrener 0206 Unit 2

Ul90lifi"alion _and _ljepeription of Occurrence:

During normal operation at 100 percent recirculation flow, the "A" flow bias loop drifted high (to 110 percent).

Conditions Prior to Occurrence:

Unit 1 in retaeling outage Unit 2 at 90%

Unit 3 at 94%

Action specified in the Technical Specification Surveillance Requirements met

. hie to inoperable,gtuip, ment. Describe.

None APinu ent cause or occurrence:

The GE Model 563-02 flow totalizer failed electronically.

Analysis of Occurrence There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment and no resulting significant chain of events.

Cort cetive Action :

Replaced flow totalizer and functionally tested the system.

Failure Data-tiene

--Retention:

Per' id - 1.ifetime; Responsibility - Document Control Supervisor j

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