ML20071B239
| ML20071B239 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 02/22/1983 |
| From: | Head G GEORGIA POWER CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20071B242 | List: |
| References | |
| NED-83-117, TAC-49705, NUDOCS 8302280057 | |
| Download: ML20071B239 (3) | |
Text
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February 22, 1983 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 EDWIN I. HATCH NUCLEAR PLANT UNIT 1 IMMEDIATE RELIEF FOR PRIMARY CONTAINENT OXYGEN CONCENTRATION TECHNICAL SPECIFICATION Gentlemen:
Pursuant to 10 CFR 50.90, as required by 10 CFR 50.59(c), Georgia Power proposes an amendment to the Unit 1 Technical Specifications Company (Appendix A to the Operating License).
Technical Specification 3.7. A.S.b requires "within the 24-hour period subsequent to placing the reactor in the RUN mode following a shutdown, the containment atmosphere oxygen concentration shall be reduced to less than 4%
However, during the return to by volume and maintained in this condition".it has become apparent that this Limiting operation of February 22, 1983, Inability to meet the 24-hour Condition for Operation (LCO) cannot be met.
f the 18-inch containment is due to time limits imposed on the use o purge and vent valves, as outlined in our letter to the NRC of October 1,(bypass LCO necessitates the use of 2-inch lines 1982.
This for containment purge and vent functions.
These two-inch 18-inch valves)
No other lines are lines do not permit timely inerting of the containment.Inerting commenced at available for containment purge and vent functions.following last personnel entry
- 1983, on February 20, about 7:00 p.m.
(CST)
We hereby request a one time extension of the into primary containment. The 24-hour LCO interval began at about 9:00 a.m.
24-hour LCO to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
(CST) on February 22, 1983.
The basis for the present 24-hour requirement on attaining a four percent oxygen concentration following entry into the RUN mode is to minimize the possibility of hydrogen combustion following a loss-of-coolant The 24-hour period was established, as stated in the bases for accident.
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Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 February 22, 1983 Page Two specification 3.7.A.5, as being sufficient to perfom necessary drywell inspections and establish the required oxygen concentration.
The control is administrative and supplements the Containment Atmosphere Dilution (CAD) systs, which can be used to control oxygen concentrations.
The CAD system provides the basis for assuring containment integrity post LOCA. Due to the license date for Unit 1, the CAD systs was installed to meet the then applicable regulations addressing hydrogen evolution.
Because the 24-hour limit is an administrative control, as opposed to providing a safety function, margins of safety, as defined in the Technical Specifications, are not reduced by allowing a longer period of : time to complete drywell inerting. The safety margin is provided by the CAD system.
Additionally, due to plant factors, maximtsn themal power will not exceed fifty percent (50%) while oxygen concentrations exceed 4%.
Extension of the drywell inerting LCO also necessitates an extension of the LCO for Technical Specification 3.7. A.7.(1), Drywell-Suppression Chamber Differential Pressure, for a like time period.
Required differential pressure cannot be established until inerting is completed 'as-the containment vents are open during inerting.
The plant-review board has reviewed the proposed change and determined that it does not constitute an unreviewed safety question.
No new modes of plant operation are involved. As explained above, margins of safety are not reduced.
Plant Hatch Unit 2 Technical specifications currently allow 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the time thermal power exceeds 15 percent during startup to accomplish this inerting function.
This change is being requested on an expeditious ' basis.
A subsequent submittal, including determinatinn of amendment class and payment of applicable fees, will follow.
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Director _of Nuclear Reactor Regulation
= Attention: Mr. John F. Stolz, Ch'ef Operating Reactors Branch No. 4 February 22, 1983 Page Three G. - F. Had states that he is Vice President of Georgia Power Company and is authorized to execute this oath 'on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.
GEORGIA POWER COMPANY By:
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//4 G. F. Head Sworn to and subscribed b re me this 22nd day of February,1983.
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NQQiry dublic Notary Pubik, Cearq8a, State at Large RE8/mb My commission Expires July 25,19;5 Enclosure xc:
J. T. Beckham, Jr.
H. C. Nix, Jr.
Senior Resident Inspector u
J. P. O'Reilly, (NRC-Region II) i i
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