ML20084A859
| ML20084A859 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 04/16/1984 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20084A850 | List: |
| References | |
| NUDOCS 8404250302 | |
| Download: ML20084A859 (2) | |
Text
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UNITED STATES E
1-NUCLEAR REGULATORY COMMISSION
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j WASHINGTON, D. C. 20555 j
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMEN 0 MENT NO. 23 TO FACILITY OPERATING LICENSE NPF-12
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SOUTH CAROLINA ELECTRIC & GAS COMPANY SOUTH CAROLINA P BLIC SERVICE AUTHORITY
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INTRODUCTION By letter dated November 16, 1983, South Carolina Electric and Gas Company (SCE8G) requested adding to Technical Specifications, requirements for i
l Feedwater Isolation Valves. SCE&G supplied additional information relating to this request by letters dated January 6, 1984, and January 25, 1984.
II.
EVALUATION Rapid isolation of main feedwater is required to prevent an overpower transient after a main steam.line break and to limit the pressure rise within the reactor building in the event of a main steam line or main feedwater line rupture within the reactor _ building.
For this reason fast closing isolation valves were installed in the Virgil C. Summer main feed-water system. However, present Technical Specifications do not address
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i these valves and would therefore allow these isolation valves to be locked in the open position for an indefinite period of time. This would nullify their function. To ensure that the main feedwater isolation valves are not locked open for an indefinite period of time and that they are indeed t
operable to perform their function, an additional Technical Specification is needed.
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It is imperative that these valves be open and operable during power oper-ation (Mode 1) so feedwater will always be available. However, since main feedwater is not necessarily needed when the reactor is.not producing power, all of these valves need not be open in Modes 2 and 3. :To fulfill their safety function, these valves should automatically close within 5 seconds after receiving a safety' signal to close. The attached Technical q
Specifications incorporate the above requirements on the operability.of Main Feedwater Isolation Valves 1611A, 16118, and 1611C and are, therefore, acceptable.
4 III.
ENVIRONMENTAL CONSIDERATION l'
We have determined that the amendment does not authorize a change in effluent types or total amounts nor an increase in power level and will Q
not result in any significant environmental impact. Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact-j
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- 4 and, pursuant to 10 CFR 551.5(d)(4), that an environmental impact state-ment or negative declaraticn and environmental impact appraisal need not be prepared in connection with the issuance of this amendment.
IV.
CONCLUSION The Commission made a proposed determination that the amendrent involves y
no significant hazards consideration which was published in the Federal Register (49 FR 3354) on January 26, 1984, and consulted with the state of South Carolina.
No public comments were received, and the state of South Carolina did not have any comments.
We have concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (2) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
-Principal Contributors: Jon B. Hopkins, Licensing Branch No. 4, DL Edward Lantz, Reactor Systems Branch, DSI Dated: April 16, 1984 t
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