05000346/LER-1978-114-03, /03L-1 on 781110:borated Water Storage Tank Low Level Trip Setpoint Was Out of Tolerance (at 59.25 in H2O) on Safety Features Actuation Sys Channel 2.Caused by Instrument Drift of Bistable

/03L-1 on 781110:borated Water Storage Tank Low Level Trip Setpoint Was Out of Tolerance (at 59.25 in H2O) on Safety Features Actuation Sys Channel 2.Caused by Instrument Drift of Bistable

ML19256A670
Person / Time
Site:	Davis Besse
Issue date:	12/07/1978
From:	Kovach S TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19256A669	List: 05000346/LER-1978-114, Forwards LER 78-114/03L-1 05000346/LER-1978-114-03, /03L-1 on 781110:borated Water Storage Tank Low Level Trip Setpoint Was Out of Tolerance (at 59.25 in H2O) on Safety Features Actuation Sys Channel 2.Caused by Instrument Drift of Bistable
References
LER-78-114-03L, LER-78-114-3L, NUDOCS 7901090181
Download: ML19256A670 (1)

LER-1978-114, /03L-1 on 781110:borated Water Storage Tank Low Level Trip Setpoint Was Out of Tolerance (at 59.25 in H2O) on Safety Features Actuation Sys Channel 2.Caused by Instrument Drift of Bistable

Event date:
Report date:
3461978114R03 - NRC Website

text

U. S. NUCLE AR REGULATORY COMMISSION RC F ORM 366 (7 71)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l

lh (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) t)

lOlHlDlBlSl1l@l0l0l- 0{ 0 Nl P l F I -l Ol 3 l@l 4 l ll 1l ll 1l@l l

l@

I h

26 LICENSE TYPE JO Si ul dd lo i

LICE".SE hvaEH 14

.LICEN5EE CODti 7

8 9 0l -l 0l 3 l 4 l 6 l@l 1 l 1 l l l 0 l 7 l 8 )@l1 l 2 l 0 l 7 l 7 l C ON' T 3ajo T,lL)@l0l5l RE 14 75 REaORT DATE 80 o

i 6o 63 EVENT OATE 9

60 61 DOCsET NUV3ER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 7

6 during the performance of surveillance testing, it was dis-1 o 2 l At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on 11/10/78 the Borated Water Storage Tank (BUST) low level trip setpoint was out of [

I o l a l l covered that I

tolerance (at 59.25 inches H 0) on Safety Features Actuation System (SFAS) Channel 2.

t 2

o 4

C BWST level instrument strings shall be l

l Technical Specification 3.3.2.1 states that a

s The 1

l operable in Modes 1, 2, and 3 with trip setpoint 249.5 and $55.0 inches H 0.

3 o

6 I

strings were operable during the period that 1 other three BWST low level instrument o

7 1

I the setpoint for Channel 2 was out of tolerance.

(NP-33-78-133) 80 o

a COYP.

VA LV E 7

8 9 SYSTENt

CAUSE

CAUSE CCOE CODE SUSCODE COYPONENiCODE SUBCODE SUBCODE ll oE I Il B}h Uh l El@ lI lN l S lT R lU h Wh yh Id 19 20 8

9 10 11 12 13 REVISION OCCURRENCE REPORT CODE TYPE N O.

SEQUENTI AL REPORT NO.

h RE,

l7 l8 l l-l l1 1l 4]

y l 0l 3l l Ll

[--j l1l EVENT YEAR LER RO

_ 21 22 23 24 26 21 28 29 JO 31 32 HOURS 22 SB iT D FO s 8.

S PFLIE AtA trA T RER I E [gl34Z lg l32Z g lJoZl@ l0l0l0lPl

]g

]2g l43Al@lCl5l6l0 @

A E A T ON O PLA T

• E T 44 47 3e 40 41 4

CAUSE DESCR6PTION AND CORRECTIVE ACTIONS h 33 l

cause of this occurrence is attributed to instrument drif t of the bi-i o l The apparent li li j l stable. At 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br /> en 11/10/78. Instrument and Control technicians reset the

]

The monthly surveillance test effec-J SFAS Channel 2 BWST low level trip setpoint.

7 l I

tively spots any such instrument drif t on this setnoint.

l,l3)l 1

80 1

4 l

7 8 9 DISCoV ERY DESCRIPTION ST 5031.01 l

STA S DO..E R OTHER STATUS ISCO RY l ElQ l q '4l 9l@l NA l

l B l@l Surveillance Test i

5 ACTIVITY C

T E *.T LOCATION OF RELEASE AMOUNT OF ACTIVITY l,

RELEASED OF RE LE ASE NA l

l NA l1 l6 l 6 @ l Z l@1 80 44 45 7

8 9 10 1

PE RSGN'.EL E x PCCU A ES l

Nu'*9 E R TYPE C E SC PIP TION 1 Di el 01@LzJ@l N^

80 i

7 cESCR PnONh I

IES PE RSON",E L INJ NuvaEs lil-1 1 01 01 0 @ l NA 80 m"@ 09 7S0109Q3/

9 11 12

(

7 8

LOSS Or en DAvscE to F4Citirv g gg;mE"ON s

NRC USE ONLY 7

8 9 10 DE4:a> DO*.

I IIIIlllllIlI]}

'WO T Y c

e;cg-)hlNA c3 l

l ca 69 2 o punyg419-259-5000. Ext. 230 2,

6 a 3

'a"