05000368/LER-1980-044-03, /03X-1:on 800701,0702 & 0902 Safety Injection Tanks (SIT) Were Found W/Boron Concentrations Below Tech Spec Limit.Caused by Failure to Flush Fill Line After Shutdown Cooling & Before SIT Makeup Injection

/03X-1:on 800701,0702 & 0902 Safety Injection Tanks (SIT) Were Found W/Boron Concentrations Below Tech Spec Limit.Caused by Failure to Flush Fill Line After Shutdown Cooling & Before SIT Makeup Injection

ML19351C977
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/01/1980
From:	Matthew Smith ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351C976	List: 05000368/LER-1980-044, Forwards LER 80-044/03X-1 05000368/LER-1980-044-03, /03X-1:on 800701,0702 & 0902 Safety Injection Tanks (SIT) Were Found W/Boron Concentrations Below Tech Spec Limit.Caused by Failure to Flush Fill Line After Shutdown Cooling & Before SIT Makeup Injection
References
LER-80-044-03X, LER-80-44-3X, NUDOCS 8010080485
Download: ML19351C977 (4)

LER-1980-044, /03X-1:on 800701,0702 & 0902 Safety Injection Tanks (SIT) Were Found W/Boron Concentrations Below Tech Spec Limit.Caused by Failure to Flush Fill Line After Shutdown Cooling & Before SIT Makeup Injection

Event date:
Report date:
3681980044R03 - NRC Website

text

- _ _ _ _.. _ _ _ _ _ _ - _ _.

v NRC f ORM 364 U. S nucle AR RE GUL ATORY COMMIS*.lON (7 77)

LICENSEE EVENT REPORT EXHtBIT A CONTROL DLOC.C: l ) l l l l.ih (PLE ASE PRINT OR TYPE ALL REQUtRED INFORMATIONI i

IT il I a lo I n_ In in b @16l n in 1 In In 101010 l-1010 l@'4 111111 E l@l l l@

i I

M W UctNSEE cod 1 14 LILENSE Nuv8LH 2$

26 Lacf NSE Tv7E Ju b7CATbH CON'T I, o I i 1

= LL)@l0 15 1010 101 31 6I 8 l@i 017 101 11810 i@llio p 11 1 8 i Ol@

8 6'

oOCKET huustm 64 69 (VENT oATE

'8 M

REPORT o ATE A0 EVENT DESCRIPTION AND PROB ABLE CONSEOVENCES h ITTil I nnring Mode 3. Safety In.iection Tank (SIT) "c" was found to have a boroni 10121 I concentration of less than the T.S. 3.5.1.c limit.

This recurred with i

ITTTI L_ SIT "D" on 7/2/80 (Mode 3), SIT "A" on 9/2/80 (Mode 1), and SIT "C" on i

ITTil I 9/2/80 (Mode 1).

Duetosampling,"A"SITpressurewasbelowT.S.3.5.11 o s I limit nn 9/2/R0.

Reoortable oer T.S. 6.9.1.9.b A sim.ilar occurrence i

' I is LED 50 vn/Rn n'47/01x-1.

l 101611 I

$'o'e"

• ^"ce' sEe'$or

oa70t sE' co coucost%i coor 19 I Fl@ D,LJ@ [L, J@ l ZI Zi ZlZ l Z lZ l@ [Z_j@ [Z j @

o 9 m_

u

,,o w,~,....

"Ma' "Tu" "WT

""J ~

O,aj,T; 19 Inl l--J In la i 41 Ld 1013 I t_xj l--J 1L__l 25 22 23 24 26 27 28 29 30 31 JJ TAaf ACT N PLANT M T LcJ@ILJ@ l Zj@

tZj@

l o i T'"d 2 7

S u ir F

M su PL ER MAN FA TtRER i

i i w@

w@ tz_j@ g 191919 l@

JJ 34 3%

36 3J 4@

el 43 43 e4 og CausE DESCRiPrioN AND CORRECHVE ACTIONS h LLLoJ l nurinn avtondad shutdnwns _ nnpratinn of the Shutdown Cooling System I

li lil 1 mgy diloto the RTT makpun na thwi th reactnr ennl ant _

This dil utinn may i EI inwer RTT hnrnn enneontratinn durinn ma kpun nnara tinn.

In all camps.

I i 3 l the RTT's unre returned en nnarahlo eratne nor Actinn a-nf T.S.3_5_1.

I i 4 l

I

's 'a'I7s' orain sratus b

"'d"o'vE om ovrav oescnierion @

seowan ln.j@ h in I ol@l NA I LILJ@l Routine Samplina I

i 5

' !nvin cari 1

'.'.ou~1 o,.cm.1, @ "

toc.no. o,,,,u.s @

. u.s.o o,

.u.s.

[.2_j @ lZ_j@lNA l

l NA 1

i 6

' n,.so~~'it e,o,0.s oc sca.1,o~ @

oo...

n,.

8 101 010 l@lz_J@lNA I

' ' n,.so~~it',~3uns oesCa.,no~@

ou..

1010 10 l@l NA l

> =

(os,:os ea u,{u' a,c,v, o,4c,o rv g W @l NA i 9 l

,o issut @[et NA niPT,oN [Jij I lll: Illillll1 2 o 7

8 9 0

68 C.

50 NAME OP PREPARER Mark Smith 501-968-2519

, sone 80100s y g

]

v 1.

Reportable Occurrence Report lio.: 80-044/03X-1 2.

Report Date: 10/t/80 3.

Occurrence Date: -7/01/80 4

Facility: Arkansas Nuclear One - Unit 2 Russellville, Arkansas S.

Identification of Occurrence:

Safety Injection Tank (SIT) "C" was found with boron concentration below T.S. 3.5.1.c limit on 7/01/80. This recurred on 7/2 with SIT "D" on 9/2 with SIT 'lA", and on 9/2/80 with SIT "C".

On 9/2/80, SIT "A" pressure was 599 psia, which is below T.S. 3.5.1.d limit of 600 psia.

This was due to sampling of the SIT.

6.

Conditions Prior to Occurrence:

Steady-State Power Reactor Power MWth Hot Standby Net Output MWe Cold Shutdown Percent of Full Power Refueling Shutdown Load Changes During Routine Power Operation Routine Startup 1

Operation Routine Shutdown Operation Other (specify)

The 7/1/80 and 7/2/80 events occurred during Mode 3 operation.

The 9/2/80 events occurred during Mode 1 operation, with the reactor at 100% Full Power.

7.

Description of Occurrence:

The events on 7/1/80 and 7/2/80 were discovered by routine sampling after addition to the tanks. This was done during Mode 3 operation j

following a shutdown.

SIT "C" was at 1721ppmb on 7/1/80, and SIT "D" was at 1725ppmb on 7/2/80. The events on 9/2/80 were discovered during routine monthly sampling.

SIT "A" was at 1715ppmb, and SIT "C" was at 1715ppmb.

o Reportable Occurrence Report No.

50-368/80-044/03X-1 8.

Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition Including Environmental Installation /

Const ruction Component Failure (See Failure Data)

Operator Other (specify)

Low boron concentration water may be entering the SIT's through the fill line at the bottom of the tanks.

Due to the location of the sample point near the bottom of the tanks, thesample is drawn from a region where the lower boron concentration water may have been added.

9.

Analysis of Occurrence:

The SIT's are filled through a line which is also used for Shut-down Cooling. When the unit has been on Shutdown Cooling for a significant time, the boron concentration in this line is the same as the Reactor Coolant System boron concentration during shutdown, which is low in boron concentration for SIT fill minimum require-ments. After securing shutdown cooling and aligning the system to the Refueling Water Tank (RWT), which is used for SIT fill water during operation, the fill line was not being flushed by recirculation back to the RWT before SIT ma,keup initiation.

Y Reportable Occurrence Report No.

50-368/80-044/03X-01 1

10.

Corrective Action

The SIT's were returned within the boron concentration limits of T.S. 3.5.1.c.

Procedures have been changed to ensure that all lines are flushed with Refueling Water Te 6. water upon termi-nation of Shutdown Cooling.

i 1

i l

4 i

11.

Failure Data:

Similar to LER 50-368/80-037 l

i l

i i

y m

~

~

e-g n---

m.