05000260/LER-1980-022-03, /03L-0:on 800602,while Performing S.I. 4.1.A-14, Turbine First Stage Pressure Permissive Pressure Switches PS-1-81 a & B & PS-1-91 a & B Setpoints Exceeded Tech Spec Limits.Caused by Switch Drifting

/03L-0:on 800602,while Performing S.I. 4.1.A-14, Turbine First Stage Pressure Permissive Pressure Switches PS-1-81 a & B & PS-1-91 a & B Setpoints Exceeded Tech Spec Limits.Caused by Switch Drifting

ML18025A947
Person / Time
Site:	Browns Ferry
Issue date:	06/27/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A946	List: 05000260/LER-1980-022, Forwards LER 80-022/03L-0 05000260/LER-1980-022-03, /03L-0:on 800602,while Performing S.I. 4.1.A-14, Turbine First Stage Pressure Permissive Pressure Switches PS-1-81 a & B & PS-1-91 a & B Setpoints Exceeded Tech Spec Limits.Caused by Switch Drifting
References
LER-80-022-03L-02, LER-80-22-3L-2, NUDOCS 8007080411
Download: ML18025A947 (4)

LER-1980-022, /03L-0:on 800602,while Performing S.I. 4.1.A-14, Turbine First Stage Pressure Permissive Pressure Switches PS-1-81 a & B & PS-1-91 a & B Setpoints Exceeded Tech Spec Limits.Caused by Switch Drifting

Event date:
Report date:
2601980022R03 - NRC Website

text

Il-)7 I

~

tt ~<<a

, CONTROL BLOCK:~

~OI A

L B

R F

2 Q?

0 7

8 9

LICENSEE CODE 14 15 0

,Q LICFNSE NUMBER

.03 P" LLJQ 25 26 LICENSE TYPE 30 57 CAT 58 I ICENSEE EVENT RI:-PART IJ'LEASE PRINT OR 7)'I'E REQUIREO INFORMATIONI CON'T

~OI sovflcE ~LQ6 0

5 0

0 0

2 6

0 7

0 DOCILET NUMBER 68 '9 EVENT OCSCRIPTION AND PROBABLE CONSEQUENCES QIO

~02 Durin normal o eration while erformin 74 75 REPORT DATE 80 EVENT DATE 6

0 2

8 0

8 0

6 2.7:8 0

03

~D 3

pressure permissive ressure switches PS-1-81 A

6 B and PS-1-91 A & B s i ~

4

~exceeded T.S. Table 3.1 A, 'limit a This would inhibit a reac o

s I

~o s

trip until a roximatel 32 ercent ower.

There are no redundant channels.

There J

~oa I waa no dan er Io health or eafet of nhlf~fe3t~llL37ennrrenC~EEO=R312kol120lJL. J Blt 7

8 FJ SYSTEM

CAUSE

CAUSE cnMp.

VA\\.YE CODE CODE SUBCODG CnhIPIJNLNT CODF.

SilJBCODE SUBCODG

~~p>>

E QIT

~Epta I

N S

T~RU Qtt

~SQIF

~ZQIC 7

8 9

10 11 I?

13 III 19 20 S E DUE NT IA1 OCCURRENCE REPORT AF.VISION LERJRO FVENT YEAfl A Gf'0R T NO.

CODE TYPE NO Qtt R fioat

~SO LJ

~02 2

[~m

~03

~L LJ

~0.

21 22 23 24 26 27 28 29 30 31 32 ACtlON FUTURE EFFFCT SHUTDOWN ATTACHMENT NPAO 4 PAIh'IE CohIP.

COMPONENT TAKEW ACTION ON I LANT METHOD HOVflS Q22 SUBhllTTED FOAhl hVB.

SUPPLIER hlANIJFACTIJAfR

~EQIF ~ZQIF

~ZQTC

~ZQTI 0

0 0

OJ

~YQPT LNJF

~NQF" LSSO 7~0j(

33 34 35 36 37 40 41 42 43 44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS Q27 Model B2T-A12SS switches had drifted.

Switches were inspected, recalibrated and functionally tested for repeatability.

No recurrence control required.

Drift due I

cro I

4 7

8 9fACILITY STATUS FC POYJER 0

FIER STATUS E

fpr

~09' QTF Ntt 7

8 9

10 12 I'I 44 ACTIVIfY -

CONTEJJT RELEASED OF AGLEAM AhlOIJNT OF ACTIVITY Z

Q33 Z

Q34 NA 7

8 9

10 11 44 PEJISUNNEL fXPOSVJIES NUTIBGII TYPE DGSCflIPTIOJIJ

~oo 0Jpt~zpla 'tt 7

8 9

11 12 13 PEflSOJJNEL INJUfllES

NUtttBEA, DESCRIPTION "I a

~oo o

Qo NA 11

'12 7

8 9

hlG RIOO OF DISCOVERY

~B" Q31 Durin 45 NA IIPJ L)ISCOVEI\\Y DGSCfltPTION 32 Bn LOCATION,Of'ELEASE Q36 Bll

'IJ 80 7

8 o

LOSS OF OR DAMAGE TO FACILITY TYPE nESCflJPTION z

Q42 NA 9

10 PUBL ICITY DESCRIPT)ON

~PQFF NA

.8,00 pa NIINF. OF PtlfPAtlFtt.

II / (

P IIOht E:

68 69 NRC USE ONLY 80

\\

~

r-

-'-~ Tennessee Valley Author~

Broivns. Ferry Nuclear ~t

@or~ I1p-1V BF 15. 2 1/10/79 LER SUPPLENENTAL'NFORMATION BFBO 260 /

80 22 Technical Specification Involved Reported Under Technical Specification Date of Occurrence

&/8/88 Time of Occurrence 1

Unit Identification and DescriL>tion'of Occurrence:

Turbine first-steae pressure

~perm ssXve pressure switches PB-1-81 A&B end PB-1-91 A&B setpoints exceeded T.S. limit of equal to or less than 154 PSEG.

This would inhibit a reactor scram, on turbine trip, until approximately 32 percent power (Approximatelty 175 PSIG).

Conditions Pr'ior to Occurrence:

Unit 1 8 76%

Unit 2 8 97%

Unit 3 9 100%

Action specified in the Technical Specification Surveillance Requirements met due to inoperable ec ui ment.

Describe.

NA A~arent Cause of Occurrence:

'ause of occurrence was setpoint drift.

Analysi. of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury and.no danger to the health or safety of the pub li'c.

Corr ective Action:

The'witches were inspected, recalibrated and functionally tested for repeatability.

1"ailure Data:

BPRO-50-296/79016

~:Retention:

eriod - Lifetime; Responsibility

- Administrative Supervisor

~Revision:

C

'r