05000280/LER-1982-016-03, /03L-0:on 820131,loss of Boric Acid Flow to Blender Observed While Attempting Blend to Vol Control Tank. Caused by Loss of Heat Tracing & Damaged Insulation Upstream of Flow Transmitter.Tracing Replaced

From kanterella
(Redirected from ML20049J536)
Jump to navigation Jump to search
/03L-0:on 820131,loss of Boric Acid Flow to Blender Observed While Attempting Blend to Vol Control Tank. Caused by Loss of Heat Tracing & Damaged Insulation Upstream of Flow Transmitter.Tracing Replaced
ML20049J536
Person / Time
Site: Surry Dominion icon.png
Issue date: 03/01/1982
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20049J469 List:
References
LER-82-016-03L, LER-82-16-3L, NUDOCS 8203180319
Download: ML20049J536 (2)
v • d • e


LER-1982-016, /03L-0:on 820131,loss of Boric Acid Flow to Blender Observed While Attempting Blend to Vol Control Tank. Caused by Loss of Heat Tracing & Damaged Insulation Upstream of Flow Transmitter.Tracing Replaced
Event date:
Report date:
2801982016R03 - NRC Website
v • d • e

text

-

p,.w.

[dRC F O AM 2 U.S. NUCLEAR REGULATORY COMMIS$10N

7 771 LICENSEE EVENT REPORT CONTROw BLCCK. I I

l I

I I th IPLEASE PRINT OR TYPE ALL REQUIREO INFORMATIONI E

l o t i l I V ! A l S t P l S l 1l@1$l 0101 -l 0101 01 01 01 -l Ol 0 l@l 411111111 l@l 1

l@

a b uCENSE1 CCC{

14 MCEN$4NWMSEE 2$

26 LICEN$4 TYPE JO

$7 LA1 64 CON -

!eii:

,","y lL @l 01510l 0l 0l 21 810 @l011 1311 l 812 l@l0131011 I s 12 l@

6 60 Si COCKET NUMgIR 66 89 IVENT DATI 74 75 REPORT CATE 8C IVENT DESCRl* TION ANO BROBABLE CONSEOUENCES h i o i: 4 i With the unit operating at 100% power, a loss of boric acid flow to the blender was I

o 42; I observed while trying to blend to the VCT. This event is contrary to I

go44; l T.S.3. 2. C.4 and is reportable as per T.S.6. 6. 2.b. (2). Since during accident 1

lo e s j l conditions, the boric acid flow from the blender is isolated with boric acid beine I 4

lo is i 1 supplied from the RWST, the health and safety of the oublic were not affected.

I l o i 71 1 I

ioneII I

So 3 3 SYSTEM

CAUSE

CAUSE COM*.

SUSCCDE VALvt CCDE CODE SUSCCDE COMPONENT CCDE SUSCCOE loisi i s I n l@ LyJ@ LA.J @ I n t r l i l T i r i n l8 Lz.J@ LzJ @

7 8

9 to 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE RiRC EVENT YE A R REPORT NO.

CODE TYPE No.

@,agg is I2 I l-l in !! 16I l/l inI,I b.J I-I I01

_v u

n 2

n v

n a

ao v

K A

ON CNP kT M

MOUR$

$9 i FOR t.

SU L1 MANUF URER l Cl@lFl@

lZl@

l Z l@

l010l010l l Yl@

l Nlg l Ll@

lT l1 18 l5 l@

22 24 as s6 s,

ao ai 42 as

=

47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h Ii t o l l Investigation has determined this event to have been caused by a loss of heat i

11 !1j t tracing and damaged insulation upstream of the flow transmitter. The defective i

,7, ; heat tracing has been replaced and tested. A design change has been ' nitiated to I

i i,,3l l change the manner by which these borated lines are heat traced. The damaged 1

l 1 i,, i 1 insulation has been repaired or replaced.

I se

?

e,

A gPowER CTHER STATUS i CD RV -

DISCQvERY DESCRIPTION Ii lo l l El@ l1 l0 l0 ]@l N/A l

lAl@l Operational Event l

i u

o as as as so s,y gg 7

RELEASED OF RELIASE AMCUNT OF ACTivlTY LOCATION 0F RELEASE Ii is l [p @ l Zl@l N/A l

l N/A l

a s ic si u

as so PER5ONNEL EXPC5URES l

NUusER TYPE @l DESCRieTION i i 171 1010 l 0 l@l l

N/A l

I

  1. ERSONNE INJUm E5 NUM9ER OESCRI TION P

liinjI01olol@l N/A I

as n

u Ic LC110F OR DAM AGE TQ FACILITY Tvet

DESCRIPTION

li 19 l l Z l@l N/A l

4 3 10 SC PU B L IC:Tv h

NRC USE ONLv I: l o i i N i@"e703180319 820301

'55u r:

PDR ADOCK 03000280 A

i l1 1I IlI'II II LI' t

e s S

PDR 6s o aC t J.

L. Wilson (804) 357-3184 i

m E C n. g. := g =

og.;;

LJ w

e-ATTACHMENT 1 SURRY POWER STATION, UNIT NO. 1 DOCKET NO:

50-280 REPORT NO:

82-016/03L-0 EVENT DATE:

01-31-82 TITLE OF THE EVENT: FLOW TRANSMITTER 1113 PLUGGED 1.

DESCRIPTION OF EVENT

On January 31, 1982, with unit 1 operating at 100% power, a loss of boric acid flow to the blender was observed while trying to makeup to the VCT.

This event is contrary to T.S.3.2.C 4 and is reportable as per T.S.6.6.2.b.(2).

2.

PROBABLE CONSEOUENCES:

Rapid response to the flow blockage limited the loss of flow to a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 10 minutes. Since during accident conditions, the BAST is isolated with Boric Acid being sup;,31ed by the RWST, the health and safety of the public were not affected.

3.

CAUSE

This event has been determined to have been caused by a heat tracing failure of circuit 24A, panel 8 and circuit 24B, panel 9 (Unit 1 Boric Acid Filter and drain) combined with insulation damaged while cleaning the area. This loss of heat tracing combined with the loss of heat due to damaged insulation allowed the growth of boric acid crystals producing a slush which collected in the restricted area of the flow transmitter (FT-lll3).

4.

IMMEDIATE CORRECTIVE ACTION

Immediate corrective action consisted of removing the boric acid plug and verifying boric acid flow to the blender.

5.

SUBSEQUENT CORRECTIVE ACTION:

The defective heat tracing was replaced and tested within the time span specified by Technical Specifications. Damaged insulation in the area has been repaired or replaced.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

Since most loss of boric acid flow problems occur due to blockage at the flow transmitters, an Engineering Study has been recommended to determine if additional heating is required for flow transmitter.

7.

GENERIC IMPLICATIONS:

A task force has reviewed the total spectrum of the Heat Tracing System and a design change has been prepared as a result of the Task Force Study.

Installation of this design change has commenced, t

Retrieved from "https://kanterella.com/w/index.php?title=05000280/LER-1982-016-03,_/03L-0:on_820131,loss_of_Boric_Acid_Flow_to_Blender_Observed_While_Attempting_Blend_to_Vol_Control_Tank._Caused_by_Loss_of_Heat_Tracing_%26_Damaged_Insulation_Upstream_of_Flow_Transmitter.Tracing_Replaced&oldid=4518357"