ML19322A602
| ML19322A602 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/18/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7911210680 | |
| Download: ML19322A602 (3) | |
Text
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'i NUCl. EAR REGULATORY COMMISSION CASHINGTON, D. C. 20666
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April 18, 1977 Dockets Nos. 50-269/270/287 Duke Power Company ATTN: fir. William 0. Parker, Jr.
Vice President - Steam Production Post Office Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
RE:
OCONEE NUCLEAR STATION, UNITS NOS.1, 2 & 3 As you may be aware, the Standard Technical Specifications for reactor coolant system activity contain limits for both equilibrium and transient iodine activity. These limitations permit continued power operation for a limited period of time with coolant system activity above the equilibrium limit but within the transient value. We believe the use of equilibrium and transient limits provides the flexibility necessary to accommodate iodine spiking during plant operation.
In arriving at the values used for each of these activity limits, we were aware of the lack of detailed and specific information relating to iodine spiking phenomena. Accordingly, the present limits reflect this limited data base through the use of conservative values.
We are interested in improving our basis for determining realistic estimates of the fodine spiking rate following power transients so that we can use this information to modify the assumptions used in the Standard Review Plan and the associated limits of the Standard Technical Specifications. With this use in mind, we request that you provide us within 60 days the available information relating to the parameters given in the enclosure.
We appreciate your cooperation in obtaining these data and believe its use will be of mutual benefit in future licensing activities.
Sincerely, ktWWQ A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
Request for Information cc w/ enclosures:
See next page 3911210 N
m,
. Duke Power Conpany April 18,1977 cc: Mr. William L. Porter Duke Power Conpany i
P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III, Esquire DeBevoise & Liberman 700 Shoreham Building 806-15th Street, NW.,
Washington, D.C.
20005 Oconee Public Library 201 South Spring Strest Walhalla, South Caroiina 29691
~
~5 ENCLOSURE REQUEST FOR DATA RELATED TO IODINE SPIKING Provide available measurements for the past 12 months of the following parameters for each power change (increase or decrease) in excess of 25%
of nominal power occurring within an hour. The measurements should include data taken on the last two occasions prior to the transient and include all measurements taken until the iodine activity has returned to an equilibrium value.
Reactor Coolant System Activity (I-131, I-133, Xe-133 and Xe-135)
Reactor Thermal Power Reactor Coolant Cleanup Flow Rate Reactor Coolant System Temperature and Pressure I
.