ML18139A528

LER 80-017/03L-0:on 800820,during Unit 2 Startup at 18% Power,Control Room Surveillance Revealed Zero Reading from Main Steam Flow Transmitter.Caused by Partially Closed Equalizing Valve.Bistables Tripped & Valve Closed

ML18139A528
Person / Time
Site:	Surry
Issue date:	09/19/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A527	List: ML18139A526 ML18139A528 ML18139A529 ML18139A530
References
LER-80-017-03L-02, LER-80-17-3L-2, NUDOCS 8009240470
Download: ML18139A528 (2)

Text

NRC.FORM.366

• S. NUCLEAR REGULATORY COMMISSION .

(7:77)

LICENSEE EVENT REPORT CONTROL BLOCK: 1'---'------_._

1 _ _.___.._..,6 18 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

~

7 8 I V I A I s Ip Is I2 101 0 I 0 - I a I o I a I a I a I aI al a101 4 I 1 I 1 I 1 I , 181 I I 0 9 LICENSEE.CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T

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~:~~; 11:J© I oI s I oI o I o I 2 I s I 1 101 o I s I 2 Io Is Io 60 61 DOCKET NUMBER 68 69 EVENT DATE

!G) I O I 9 I 1 I 9 I 8 I O IG) 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

!During start up operation of Unit #2 at 18% power, control room surveillance revealed

[2J]J 1a zero reading from main steam flow transmitter (FT-2495). Channel 4 high steam flow

[]:]}] !Bi-stables were set to the trip position. This is a degraded mode of operation as

~ !specified in T.S.3.7.A and is reportable by T.S.6.6.2 b 1. The health and safety of the!

C£:JI] !public was not affected.

~

• [u]J 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE suscoDE SUBCODE

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7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

~ LER/RO CVENT YE.A.A REPORT NO. CODE TYPE NO.

~ REPORT NUMBER I 8 O j I I O

I 1

1 7

1 I ......-1 I O

1 3

I ~ ~

21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITIEO FORM SUB. SUPPLIER MANUFACTURER ls.J@W@

33 34 W@

35 Lu I o!o!olol W@* LNJ(§) Lu@ I EI J I 2 IQ I@

36 37 40 41 42 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

The equalizing valve for FT-2495 was not fully closed, preventing proper opera ti on of the transmitter. The immediate corrective action was ta place tbe associated El stable~

to the trip position. The equalizing valve was closed and the transmitter returned to service.

8 9 80 FACILITY STATUS  % POWER OTHER STATUS @ METHOD OF DISCOVERY DISCOVERY DESCRIPTION @

[ID] Lci@ I O I 1 I 8 l@L-1__----1,l.NA~----1 LA.J(ivj Operator Snr:vei 11 ance 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT Q,.

RELEASED OF RELEASE AMOUNT OF ACTIVITY . LOCATION OF RELEASE @

~ lLl@ W@L..I__,.J.lNLil,A_ _ _ _ -J 8 9 10 11 44 45 80 PERSONNEL EXPOSURES r.;;:;\

NUMBER ~ TYPE DESCRIPTION o:I?J l o I oI oJ0W@L,...__________uN£!,,___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.....,

8 9 11 12 13 80 PERSONNEL INJURIES r::;-:;\

NUMBER DESCRIPTION~

~ 0 j Oj O l@)L___________. !alNEa,A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~

7 8 9 11 12 so LOSS OF OR DAMAGE TO FACILITY '4:JI TYPE DESCRIPTION V

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7 8 9 10 80 1ssu:~~~;;CRIPTION@ N RC USE ONLY "

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~ L. Wilson (8 ;4) 357-3184 PHONE:-------'-------

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ATTACHMENT 1

• SURRY POWER STATION, UN 2 DOCKET NO: 50-281 REPORT NO: 80-017/03L-0 EVENT DATE: 08-20-80 TITLE OF REPORT FLOW TRANSMITTER (FT-2495) FAILURE

1. Description of Event:

During startup operation with Unit #2 at 18% power, control room surveillance revealed a zero reading on main steam flow indicator (FI-2495) powered from main steam flow transmitter (FT-2495). This is a degraded mode of operation as permitted by T.S.3.7.A and is reportable in accordance with T.S.6.6.2.b(l).

2. Probable Consequences and Status of Redundant System:

With this transmitter not fully functional, there was no steam line flow in-dication for one of the two channels that monitor and provide steam line break protection for "C" Steam Generator. The redundant steam line flow transmitter for this Steam Generator was still available to provide the required control and protection signals. In addition other diverse protection signals were available to mitigate the consequences of the main steam pipe rupture. There-fore the health and safety of the public were not affected.

3. Cause:

Flow transmitter FT-2495 failed to function because the equalizing valve for the transmitter was not fully closed, thereby preventing proper operation of the transmitter.

4. Immediate Corrective Action:

The immediate corrective action was to place channel 4 high steam flow and channel 4 steam flow greater than feed flow Bi-stable switches to the trip mode.

5. Subsequent Corrective Action:

The subsequent corrective action was to fully close the equalizing valve for the transmitter.

6. Actions Taken to Prevent Recurrence:

No additional actions were deemed necessary.

7. Generic Implications:

Noiie.