ML20039F148
| ML20039F148 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/14/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20037A870 | List: |
| References | |
| NUDOCS 8201120074 | |
| Download: ML20039F148 (1) | |
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ENCLOSURE 3 Safety Evaluation Report Arkansas Nuclear One - Un-it 2 Mechanical Operability of. Purge / Vent Valves Equipment Qualification Branch Division of Engineering Brookhaven National Labs in-conjunction with the NRC staff has reviewed the Arkansas Power & Light Company's letter of October 25, 1979 in response to the NRC letter of September 27, 1979 concerning purge and vent valv.e mechanical operability.
Arkansas Nuclear One - Unit 2 (AN0-2) Technical Specifications prohibit purging during power operation. The licensee's letter of October 25, 1979 addresses this technical specification requirement and states that valve qualification will be addressed for ANO-2 when and if they submit a Technical Specification change request on this subject. Under these conditions there is no requirement for these valves to close under design basis LOCA conditions and therefore no necessity for the demonstration required by NRC guidelines.
The containment purge / vent valves must be maintained closed in accordance with Item II.6.f, Section 6.2.4 of the Standard Review Plan while in operating modes (other than cold shutdown or refueling) in order to maintain this condition.
If the licensee later intends to use these valves during operating MODES 1, 2, 3 and 4 they must first demonstrate operability of these valves as required by CSB Technical Position 6-4 and the September 27, 1979 " Guidelines for Demonstration of Operability of Purge and Vent Valves." Operability would then be assessed by the staff (Equipment Qualification Branch) through a review of the operability documentation and the results would be documented in a safety evaluation supporting any modification to the applicable Technical Specifications.
Also in the event the licensee later intends to use these valves during operating MODES 1, 2, 3 and 4 there is an acceptable alter' native that the licensee may wish to consider in lieu of completing the valve qualification i
program for the large butterfly-type valves. This would be the installation of a fully qualified mini-purge system with valves 8 inches or smaller to bypass the larger valves. Such a system change might prove more timely and more cost-effective. The system would meet BTP CSB 6-4 I, tem B.l.c.
The staff concludes that the licensee's Technical Specification which requires valves to be closed;while in modes other than cold shutdown or refueling satisfies the NRC's operability requirement. Based on this the staff does not plan any further action in the area of operability evaluation for these valves.
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8201120074 811214 PDR ADOCK 05000368 P
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