ML20052G561

LER 82-020/03L-0:on 820417,following Reactor Shutdown,Sample of RCS Indicated Iodine Dose Equivalent Value Exceeding Limits.Caused by Iodine Spike from Fuel Due to Depressurization Shock from Shutdown

ML20052G561
Person / Time
Site:	Calvert Cliffs
Issue date:	05/10/1982
From:	Crinigan P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20052G554	List: ML20052G553 ML20052G561
References
LER-82-020-03L-01, LER-82-20-3L-1, NUDOCS 8205180463
Download: ML20052G561 (3)

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NRC FORM 166 87 71f**

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60 61 DOCKET NUMBE R 68 69 EVENT OATE 14 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h On April 17, 1982 at 0500 Hrs, while Tave was < 500 F followine a l I o 12 I l IO I3 l l reactor shutdown, a chemistry surveillance sample of the reactor cool- I l o 14 I I ant system indicated an Iodine Dose Equivalent (IDE) value of 1.31 l Ioisl I uCi/gm. This exceeds the limit of 1.0 uCi/gm (T.S. 3.4.8.1). The IDE I returned within specification by 2140 Hrs. I e IO is l l l

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lilo ] l The depressurization shock associated with the shutdown resulted in an i

" iodine snike" from the fuel. The " iodine spiking" is not an abnormal I Ii iii !

[T"T- l I occurrence since it is a known anticipated phenomenon. Therefore, no I yI additional corrective action is deemed necessary other than purification j I"TTTl I of the system utilizing an ton exchanger. l 80 7 8 9 ST S  % POWER OTHER STATUS 015 O RY OISCOVERY DESCRIPTION l1 l5llGlh l0l0l0l@l NA l l Al@l Chemistry Surveillance l ACTIVITY CONTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l 1_],6,_jRELEASE

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LER NO. 82-20/3L 2

DOCKET NO. 50-317

LICENSE NO. DPR-53 j EVENT DATE 04-17-82 REPORT DATE 05-10-82 ATTACHMENT SUPPLEMENTAL i

Information concerning the reactor power history, the fuel burnup by core region, the reactor coolant degassing history, the reactor coolant purification history, and the activity analyses I

of the reactor coolant is provided as per the requirements of the Technical Specifications.

1. Reactor Power History DATE TIME  % POWER 4-15-82 thru 4-16-82 2200H 95 4-16-82 2300H 87 4-16-82 2400H 72 4-17-82 0100H 62

4-17-82 0200H 42

, 4-17-82 0300H 20 i 4-17-82 0400H S/D

.! 4-17-82 0500H S/D

2. Fuel Burnup by Core Region FUEL BUNDLE MWD /MTU D 41778.7 E 33360.2 F 24809.2 G 13203.1

! 3. Degassification of the Reactor Coolant System DISSOLVED H CONCENTRATIbN l DATE TIME OC/KG 4-14-82 1000H 38 4-15-82 1420H 16 4-16-82 0730H 11 4-17-82 0930H 5.5 4-17-82 1215H 2.3 l

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4 Purification History of the Reactor Coolant Systen Nornal purification consisting of a single mixed bed ion exchanger containing 15 ft 3 of anion resin and 15 ft 3 of cation resin was in service until 4-17-82 at approxi-mately 0200H. At tgis tine an additional ion exchanger consisting of 30 ft of cation resin was also placed into service to aid the purification of t he s y s t en i n anticipation of the refueling outage. These two Ion exchangers remained in service throughout the transient condition.

5. Activity levels in the Reactor Coolant Systen TOTAL IODINE DOSE ACTIVITY DATE TIME EQUIVALENT (uCi/gr) 4-16-82 0730H 1.00 E-1 1.70 4-17-82 0215H 1.01 E-1 1.84 4-17-82 0500H 1.31 2.82 4-17-82 0635H 1.44 4.01 4-17-82 0900H 1.52 3.58 4-17-82 Il30H 1.55 3.89 4-17-82 1530H 1.07 2.70 4-17-82 1730H 1.09 2.54 4-17-82 1934H 1.02 3.31 4-17-82 2140H 8.20 E-1 2.68 E[ ,