ML20198G536
| ML20198G536 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 07/06/1976 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Deyoung R Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1127 NUDOCS 8605290652 | |
| Download: ML20198G536 (1) | |
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DISTRIBUTION COPIES: CSB RAADING; NRR READING; PS READING; DOCKET FILES l
I JUL 6 197 6 l
f Docket No.:
0 140 50-513 R. C. DeYoung, Deputy Director, Division of Project Management i
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WPPSS 1 AND 4 - CP REVIEW ITEMS (TAR 3700)
This is in response to Technical Assistance Request 3700 regarding the proposed change in the containment isolation requirements for the decay heat removal system offluent lines. The containment isolation provisions for these lines are identified in Table 6.2-27 (Amendment 17) as follows: Inside containment, two remote manual, motor operated valves in series pare provided, and outside l
containment, one valve of the same type is provided.
The proposed change involves the branch line outside containment which bypasses the outside containment isolation valve, in each of the decay heat removal system effluent lines. The applicant proposes to manually pre-set the manual valve in the bypass lines for the purpose of providing a return flow path under post-LOCA, long-term cooling conditions and thereby prevent potential boron precipitation and plugging of vital flow paths in the reactor vessel.
r CSB !aas reviewed the proposed change, and it is our conclusion that this isola-tion arrangement is acceptable on the following basis, i
The conenin==nt isolation valve outside containment which is ebeing bypassed is not required since the decay heat removal systen is a. closed system designed to ESF system standards. This containment isolation arrangement, i.e., contain-ment isolation valve inside containment _ and closed system outside containment, is acceptable on the other defined basis for GDC 55. Standard Review Plan 6.2.4, " Containment Isolation," is being changed to reflect the acceptability of this containment. isolation arrangement for the RHR system.
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v 8605290652 760706
- .' Robert L. Tedesco. Assistant Director PDR ADOCK 0500 0
for Plant Systems
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Division of Systees Safety i
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S. Hanauer J. Kudrick R. Boyd J. Shapaker F. Schroeder R. Fluggee J. Stols S. Brown T. Ces J. Glynn i
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