ML19347E006

Updated LER 81-008/03X-1:on 810217 & 0310,primary Coolant I-131 Dose Equivalent Value Observed Following Reactor Trip Exceeded Tech Spec 3.4.8.a.Caused by Expected Spike in Primary Coolant Activity Following Trip

ML19347E006
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/07/1981
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19347E003	List: ML19347E002 ML19347E006
References
LER-81-008-03X, LER-81-8-3X, NUDOCS 8104140605
Download: ML19347E006 (6)

Text

.

b) Update Report-Previous Report Date 3/12/81

\

l NRC pOnM 3s4 U. 5. NUCLE AR REGULATORY COMMIS&60N j LICENSEE EVENT REPORT EXHIBIT A

~

CONTMOL OLOct(: l l l l l l

'h l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI l

8 l AIR 7 8 9 l Al Nj ol 21@ill 0 l0 l -l0 l0 LlCEN58 L,CEN$tt CODg 44 0l 0} 0Al- l 0 l0 lgl4 l1 NUp9t 2% 26 l 1 l1 l1.,4 LBCtNil 1 lglJC CAT 6eIg bl CON *7

% (1,j@l0 l 5 p l0 l 0l3 l6 l 8 ]@l 012111718 l 11@l 014ut,ont l01718 l 11@

%8 60 el oOCaETNUyggn EVENT DESCRIPTION AND PRC8 A8LE CONSEQUENCES to 68 63 EvtNTDaig ,e 76 oats so o 2 I On two occasions, during Mode Toperation following a Reactor trip from i o i 100% rated reactor power, a primary coolant Iodine-131 dose equivalent i o a i value was observed. exceeding the limit of T.S.3.4.8.a A spike of 1.59 I o s i microcuries per gram occurred on 2/17/81 and a spike of 1.66 microcuries I o 6 l DAP gram Orrfirred nn 1/1n/A1_ This nccitrrence jg similar tg f_EDag l gI 50-368/80-009. Reportable per T.S.6.9.1.9.b. I r5Til i I e ,c y e

<2.,e~,,, _,

E. D]D. Icw"d i l@

@t@ [: %@

,, ,, o 12 12 : Z ; 2l 2 :@ $.., ;;g 1

g.@t,,

wi~,... I'.?f#,','# "'Ea"*" "Cf"' ""d' "

@ ,"u ;;" ,,,,o 18111 u n L-l u

1010181 2 n

- Ld 10 131 n 2, L2J n

L--J u

L_1J n

T. KIN A T M Tw MOum1 58 .i ,09 U,6 su,, oss sa itIngn

, 23

[XJgboN@

34 hA@

h LZJO M

l0 101014001 O@ LNj@ [ Zj@ l 219 l 919 l@

33 el el 43 se e7 CAUSE DESCRIPTION AND CC4 REC flVE ACTIONS 27 gl The specific activity increase was caused by an oxnocted sniko in nri- I m i mary coolant activity following a reactor trip. The reactor coolant i

, 2 : liquid was processed through the primary dcmineralizers which reduced I

, , i the concentration of radioactive iodine to within acceptable limits. i e

i Additional historical information is attached Der the reauirements of T.1.3.4.8.d

'5Ms' s ,0. a ov-i ituus @ "'d's ?A' c,scovi . o.m. ..o @

LusJ p_j@ 1010l q@l NA l [Aj@l RCS Sample l Aaivn, can,., " " " " " "

. uisio o,ana.s. tmm.oso,oa.sc@

i o L2j @ gj@l NA .=~ r c, .c1,vir, @ l [ NA l

,,v.so~

o. lit i.,osses 1,,. on,,,,,o, @

i > 10101 Ol@LZj@l NA l

' ' * ,.so~~d' ,v'4n " a

~uo. . ocic...res@

i 4 10 l 0l0 l@l NA l go, ogo," ,cr[o .c urv g EB L2J@l "

NA i

' ~

~acUsEoNLv 2 o ,{Ejso,'"@l*"$'ic..,,,o~

NA @ 1 [t1i1llllllll

,ogo,,,,,,,,, Chris N. Shively ,,,m 5d$/968-2519 810.4140&oS .

.l Attachment to LER 50-368/81-008 Occurrence'Date: 2/17/81 Items 1.& 3. Reactor Power & Cleanup Flow History Starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to ist sample .in which limit was exceeded

. Iodine DE = 1.59 uCi/GM 2/17/81 0 1515 (Sample time 1312) .

~

Rx Power LD Flow CHRG PWMP 1300 100% <38 GPM $46 GPM 2 1400 l 2/15/81 ~ 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400-2/16/81 0100

! 0200 ,

t 0300 i 0400 0500 0600 0700 i 0800 0900 l 1000

1100 1 1200 1300 i

q

3. e i

Attachment to LER 50-368/81-008 Occurrence Date: 2/17/81

• Rx Power LO Flow CHRG Pump 2/16/81' 1500 100% N33 GPM S46 GPM 1600 1700 1800

1900 2000 2100 2200 2300 i 2400 2/17/81 0100 0200 0300 0400 4

0500 0600 0700 0800 0900 ,

'1000,

, 1100 0% 83 GPM 89 GPM 1- 1200 38 GPM 45 GPM 1300 1400

1500 0

Attachment to LER 50-368/81-008 Occurrence Date: 2/17/81 Item 2. Fuel Burnup By Core Region Fuel Type Batch Exposure (MWD /MTU) 1 6383.4543 2 8558.8705 3 10076.9981 4 11735.7655 5 12500.5411 6 11931.9310 7 6657.1972 Core Average 11089.5 MWD /MTU Item 4. History of Degassing Operation tio degassing prior to exceeding IDE of 1.0 uCi/GM.

Normal letdown / makeup until time of notficiation of >1.0 uCi/GM. .

1 Item 5. Time Duration of DE I-131 > 1.0 uCI/gm The duration with activity > 1.0 uCi/ Gram was approximately 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />. A sample of reactor coolant was taken at 1312 hours0.0152 days <br />0.364 hours <br />0.00217 weeks <br />4.99216e-4 months <br /> on 2/17/81, showing an activity of 1.59 uCi/gm. Samples were taken at four hour intervals until activity indicated I-131 DE equal tc 0.69 uCi/gm.

The cumulative operating time at a primary coolant specific activi ty > 1.0 uCi/gm DE I-131 equals approximately 19 hours2.199074e-4 days <br />0.00528 hours <br />3.141534e-5 weeks <br />7.2295e-6 months <br /> for the last six month period (less than 500 hour0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> limit of T.S.

3.4.8 Action a).

i i

i f

r

- , - ., e . ., - -, - - -- - -

,-- -y , e - a

Attachment to LER 50-368/81-008 Occurrence Date: 3/10/81 Items 1 & 3: Reactor Power & Cleanup Flow History starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to ist sample in which limit

, was exceeded.

Iodine DE = 1.66 uCi/gm on 3/10/81 0 0725 hours0.00839 days <br />0.201 hours <br />0.0012 weeks <br />2.758625e-4 months <br /> Time Rx Power LD Flow CHRG Flow 3/08/81 0700 100% s44 GPM s44 GPM se s/ sr 3/09/81 0700 100% s44 GPM s4'4GPM v 5/ -V v 3/10/81 0240. 0% s44 GPM s44 GPM 3/ S/ S/ s/

3/10/81 0725 0% s44 GPM s44 GPM t

6

- + - - >-----m- - , , . - - - ,n,,,, _.- , , , ,

l Attachment to LER 50-368/81-003 Occurrence Date: 3/10/81 Item 2: Fuel Burnup by Core Region Batch Exposure (MWD /MTU) 1 6853.9 2 9154.2 3 10822.2 4 12588.2 5 13389.8 6 12758.4 7 7170.2 Item 4: History of Degassing Operation ,

No degassing prior to exceeding IDE of 1.0 uCi/gm.

Normal letdown / makeup until time of notification of

>1.0 uCi/gm.

Item 5: Time Duration of IDE > uCi/GM .

1 Duration with activity >1.0 uCi/GM was approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. A sample of the Reactor Coolant was taken at 0725 hours0.00839 days <br />0.201 hours <br />0.0012 weeks <br />2.758625e-4 months <br /> on 3/10/81, showing an activity of 1.66 uCi/GM. Samples were taken at 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> intervals until activity indicated IDE <1.0 uCi/GM. The cumulative operating time at a primary coolant specific activity

>1.0 uCi/GM I-131 equals approximately 29 hours3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br /> for the last 6 month period ( <500 hour limit of T.S. 3.4.8 Action a).

l

- , .