05000348/LER-1979-052-03, /03L-0:on 791106,refueling Water Storage Tank Declared Inoperable When Water Vol Fell Below Tech Specs. Caused by Drift Problems on Level Transmitters.Transmitters Undergoing Repairs

/03L-0:on 791106,refueling Water Storage Tank Declared Inoperable When Water Vol Fell Below Tech Specs. Caused by Drift Problems on Level Transmitters.Transmitters Undergoing Repairs

ML19262A941
Person / Time
Site:	Farley
Issue date:	12/03/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19262A938	List: 05000348/LER-1979-050-03, /03L-0:on 791107,trip Bistables for Pressurizer Pressure Transmitter PT455 Not Tripped Before Pressurizer Level Transmitter 459 Root Valves Closed.Caused by Personnel Error.Matter to Be Discussed W/Operations Personnel 05000348/LER-1979-051-03, /03L-0:on 791103,during Surveillance Test on Turbine Driven Auxiliary Feedwater Pump,Pump Tripped on Overspeed.Caused by Misadjustment of Manual Speed Due to Leak of Position Markings.Manual Control Adjusted 05000348/LER-1979-052-03, /03L-0:on 791106,refueling Water Storage Tank Declared Inoperable When Water Vol Fell Below Tech Specs. Caused by Drift Problems on Level Transmitters.Transmitters Undergoing Repairs 05000348/LER-1979-054-01, /01T-0:on 791119,notified by Westinghouse That Possibility Exists That Current Negative Rate Trip Setpoints May Not Provide Reactor Trip During Single or Multiple Rod Drop Events.Caused by Designer Calculation Errors ML19262A937
References
LER-79-052-03L, LER-79-52-3L, NUDOCS 7912110338
Download: ML19262A941 (1)

LER-1979-052, /03L-0:on 791106,refueling Water Storage Tank Declared Inoperable When Water Vol Fell Below Tech Specs. Caused by Drift Problems on Level Transmitters.Transmitters Undergoing Repairs

Event date:
Report date:
3481979052R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPO.1T NTROL 8 LOCK: l l

l l

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

R l Al Ll Jl Ml Fl 1l@l 0 l 0l -l 0 l 0 l 0 l 0 l 0 l - l 0 l 0 l@l 4 l 1 l 1 l 1 l 1 l@l l

l@

7 8 9 UCENSEE CODE 14 15 LICENSE NUMBER 26 26 LICENSE TYPE JO 51 C A T 58 CON'T RTil IL @l 01 51 01 Oi 01 3 l 4 l 8 Gil ll [ 0 l 6 l 7 l 9 }@l 1 l 2 l 0 l 3 l 7 l 9 l@

5O RC 7

8 60 68 COCK ET NUMBER m

63 EVENT DA7E I4 75 REPOHT DATE d0 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lo 121 l At 1325 on 11/6/79, the Refueling Water Storace Tank (RWST) was declared inoperable lo la l l when it was determined that the water volume (456,279 2allons) was below the Tech.

l Soec. 3.5.5 limit of 471,000 gallons.

Tech. Soec. 3.5.5 action statement r ecu ire-l o

4 o

5 l ments were met.

The RWST level was restored to >471,000 callons by 1700 on 11/6/79. l Q W l The lalth and safety of the general public were not affected.

I 3

7 l

l io e

i I

7 8 9 80 SYSTEM

CAUSE

CAUSE COMP VALVE CODE CCCE SLBCOOE COMPONENT COCE S t.,8 C 0 0 E SUCCCOE Ls l r @ i xl@ l Z i@ l_1 x l S i r i a i u i@ i Ti@ 12 i@

o 9

3 9

to 11 12 13 18 19 20 SEQUEN TI AL CCCU R R ENCE REFORT R E VISIO N LER RC EVENT YEAR REPORT NO.

COOE TYPE NO.

@ gg 17lal l-l i n sl21 l/l In 13 I I ti l-l In l al 42 2J 24

.6 21

d a

ACTf CN FJTunE EFFECT W u T D C'/. N AT'ACHVENT N# A D-4 PCa'?E COV A CC'.'PC*.E N T TAKEN ACTICN ON PL ANT VETHOD

- OURS SUBVIT'ED FOrW wis SLPPLf ER M AN L r a;T;,q y s (JXIh h

l5El@

l Z l(3) l0101010l l ': ig l N l@

l a !@

d; i 6 IC !@)

J s4 J

J6 Je 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i

o lAs a result of the initiation of a RWFT low level alarm (<471.000 ent!ansT d ich was I

i i

lat variance with the RWST level indicators (>471.000 Tallons)., troubleshoord--

I lcffort revealed that one level transmitter had drif ted low and the cther transmitter i

2

. B l was exhibitine uncorrectable drif t problems.

One level transmit ter was returned to l

l service on 11/9/79 and the other transmitter will be renaired when narts are availablel -

4 8 3 80 STA S

% PCWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION l F l@ l 0 l 4 l 5 l@

NA l

lAl@l Troubleshooting effort l

i s

A8Tivifv co'0TE NT i2 n

44 4s a0 wouNT OF ACmiTY @

tocAno.ornctcA:t@

notcA;ED or HE LE Au LM L4] @ l Z I@

N^

l N^

l i

I iJ l1 43 4's

,o PF f 60NNE t f m PO5UlitS Nil'?HF ft TYH OESclDPTeON D, h

O M NN/TDTlf\\f7/a n I

!Iii10l0l0j@l7.l@l NA 2,~..,1, ',.. m. n u

- ouo eauy(gj((g' m

ommP,.@

1528 135 N m.,,4.,

al l 0l 0 0 l@l NA 1

8 3 1:

12 80 LOSS OF OH OAMAGE TO F ACILITY TYPE

DESCRIPTION

NA 7912110 4

l l Z l@l i 9 7

8 9 10 80 y ISSUE @[ ESCRIPTION NA l

l [jl[lllll l[ l}

7 s 3 10 68 69 80 3 U

NAME OF PREPARER PHONE:

v~