ML20197H815
| ML20197H815 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/12/1984 |
| From: | Houston R Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0759, CON-WNP-759 TAC-M54443, NUDOCS 8407190174 | |
| Download: ML20197H815 (3) | |
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July 12,1984 g,".....
MEMORANDUM FOR:
T. Novak, Assistant Director for Licensing Division of Licensing FROM:
R. W. Houston, Assistant Director for Reactor Safety Division of Systems Integration
SUBJECT:
OR ACTION:
PROPOSED CHANGE TO THE TECHNICAL SPECIFICATIONS FOR WASHINGTON PUBLIC POWER SUPPLY SYSTEM (WNP-2) (TACS M54443)
Plant Name: WNP-2 Docket No.:
50-397 TAC No.: M54443 Region:
V Responsible Branch:
LB #2 Project Manager:
R. Auluck Due Date: June 28, 1984 Review Status:
Complete By letters dated January 20, 1984 and February 8, 1984, the Washington Public Power Supply System proposed certain changes to the Technical Specifications for Nuclear Project No. 2 (WNP-2). These changes revise the containment isolation closure times, Table 3.6.3-1 of the Technical Specification, from 5 seconds to 15 seconds for 8 Reactor Recirculation Hydraulic Valves and Reactor Recirculation (Seal Injection) valves.
The licensee stated that the proposed changes will still provide adequate time for valve closure to limit the release of radioactivity from the containment. According to the licensee, release of contaminants from failed fuel post-LOCA does not occur mechanistically until sometime on the order of a minute. The licensee stated that, for a design basis accident, the FSAR analyses indicated that fuel uncovery does not occur for approximately 30 seconds and peak clad temperatures do not occur for approximately 120 seconds.
Therefore, it was concluded by the licensee that the proposed maximum closure time of 15 seconds, for the valves identified earlier, will not result in an increase in the probability of releases from failed fuel.
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T. M. Novak' Based on our evaluation of the proposed Technical Specification, we conclude that since it is very unlikely to have fuel failure within the first 30 seconds following the onset of a LOCA, valve closure time of 15 seconds will assure no release of radioactivity from the containment.
We, therefore, recommend approval of the proposed change to Technical Specification. is the SALP input for this review.
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R. W. Houston, Assistant Director for Reactor Safety Division of Systems Integration
Enclosure:
As stated cc:
DSI/Dir.
D. Eisenhut DISTRIBUTION:
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