05000368/LER-1981-008, 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

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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 Entergy icon.png
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:
References
LER-81-008-03X, LER-81-8-3X, NUDOCS 8104140605
Download: ML19347E006 (6)
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LER-1981-008, 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
Event date:
Report date:
3681981008R00 - NRC Website
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Update Report-Previous Report Date 3/12/81

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,e 76 ut,ont oats so EVENT DESCRIPTION AND PRC8 A8LE CONSEQUENCES to I On two occasions, during Mode Toperation following a Reactor trip from i o 2 100% rated reactor power, a primary coolant Iodine-131 dose equivalent i

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i value was observed. exceeding the limit of T.S.3.4.8.a A spike of 1.59 I o a i microcuries per gram occurred on 2/17/81 and a spike of 1.66 microcuries I o s l

o 6 l DAP gram Orrfirred nn 1/1n/A1_

This nccitrrence jg similar tg f_EDag gI 50-368/80-009. Reportable per T.S.6.9.1.9.b.

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M 33 40 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.

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,, 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

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.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 1400 2

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 1200 1

1300 i

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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 0500 4

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).

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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 s4' GPM 4

3/09/81 0700 100%

s44 GPM 3/10/81 0240.

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v 0%

s44 GPM s44 GPM 3/

S/

S/

s/

3/10/81 0725 0%

s44 GPM s44 GPM t

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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).

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