2CAN118106, Submits Info on Cycle 2 Primary Sys I-131 Activity & Inferences Re Perforated Fuel Rods in Core.Activity of I-131 Was Not Achieved Until Sept 1981,due to Fluctuating Power & Plant Conditions
| ML20033D036 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/25/1981 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| 2CAN118106, NUDOCS 8112040612 | |
| Download: ML20033D036 (2) | |
Text
e' ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 [501)371-4000 November 25, 1981 2CAN118106 Director of Nuclear Reactor Regulation ATTN: Mr. Robert A. Clark, Chief f e ] g/
Operating Reactors Branch #3 t
Division of Licensing
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U. S. Nuclear Regulatory Commission
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f Washington, D. C.
20555 il
'c DEcs IOOIA
SUBJECT:
Arkansas Nuclear One - Unit 2 v.s. D E @ ^'cor Docket No. 50-368 License No. NPF-6 i
Cycle 2 Iod ha Activity (File:
2-1510) 7
Gentlemen:
As requested in NRC's SER accompanying Amendment 24 of the ANO-2 operating license, we are providing you with our observations to date on the Cycle 2 primary system iodine - 131 activity and inferences relating to perforated fuel rods in the core.
As a point of reference, during Cycle 1 at ANO-2, the equilibrium activity of iodine - 131 in the reactor coolant system (RCS) was typically about 0.12 pci/cc during long periods of essentially full power operation.
At the end-of-cycle 1, the entire core was sipped, and all fuel rods found to be perforated were removed from those assemblies scheduled for additional service in Cycle 2.
Cycle 2 criticality was achieved on June 29, 1981.
Equilibrium activity of iodine - 131 in the RCS was not achieved until into September 1981 due to fluctuating power and plant conditions existing prior to that time.
Since September, however, the activity of iodine - 131 in the RCS has been stable at about 0.06 pci/cc for long periods of essentially full power operation.
Based on a comparison of the Cycle 2 and Cycle 1 iodine
- 131 activities, we infer the number of perforated fuel rods present in the core at this time in Cycle 2 is aoout one-half the number of perforated rods present in the core at the end-of-cycle 1.
In comparison to the limiting condition for operation, iodine dose equivalent activity is approximately 0.12 pci/cc for Cycle 2 (as compared to a Technical Specification limit of 1.0 pei/cc) and the observed A
f activity level has remained stable.
G3 8112040612 811125 PDR ADOCK 05000368 P
PDR MEMBEA MIDOLE SOUTH UTILITIES SYSTEM
I' L:
i As this small RCS lodine level.is well within limits established in the Technical Specifications and assumed in the Safety Analyses, continued j
operation at these iodine levels does not impact negatively on public health and safety.
i We will continue.to closely monitor the iodine activity level in the RCS as operation proceeds.
Very truly yours, bG4nd 0 f I
David C. Trimble Manager, Licensing 4
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