ML20198H896
| ML20198H896 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 05/20/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20198H876 | List: |
| References | |
| NUDOCS 8605300585 | |
| Download: ML20198H896 (2) | |
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UNITED STATES
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[gg NUCLEAR REGULATORY COMMISSION l
WASHINGTON, D. C. 20655 g
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SAFETY EVAll'ATION BY THE OFFICE OF NUCLEAR REACTOR REn0LATION RELATED TO AMFNOMENT NO.50 TO FACILITY OPERATING LICENSE NPF-12 50llTH CAROLINA ELFCTRIC & GAS COMPANY i
SOUTH CAROLINA PUBLIC SERVICE AllTHORITY I.
INTRODUCTION By letter dated June 10, 1985, South Carolina Electric & Gas Company (the licensee) requested a change to the Virgil C. Sumer Nuclear Station Tech-nical Specification Section 3/4.8.1, "A.C. Sources," and its bases. The proposed revision is based on NRC Generic Letter 84-15 " Proposed Staff Actiogs to Improve a.nd Maintain Diesel Generator Reliability." The revision will reduce the frequency and severity of diesel generator starts, thereby decreasing engine wear and increasing reliability. The revision will also regroup, for -
3 clarity and useability, some listings of the surveillance requirements.
II. EVALUATION To reduce the number of cold fast start surveillance tests for diesel genera-tors (DGs), Generic letter (GL) 84-15 allows preparatory actions such as prelubrication on all moving parts and wamup procedures which are necessary to reduce engine wear, extend life and improve availability. The proposed revision to Technical Specification (T.S.) surveillance requirement 4.8.1.1.2.a considers such actions as prescribed by the manufacturer regarding engine prelube, warmup procedures, and gradual loading. The requirement to fast load the DGs is maintained but on a reduced frequency of once per 184 days by inserting a new T.S. surveillance requirement 4.8.1.1.2.d to start and load the DGs I
from ambient conditions (fast start) within the time required for accident conditions.
T.S. surveillance requirements were then renumbered to accommodate this addition.
We have reviewed the proposed revisions and find that these proposed surveillance reouirements are consistent with the intent of GL PA-15 to reduce the number and severity of cold fast starts. Therefore, we conclude that these revisions are acceptable except as noted below.
In T.S. Surveillance Requirements 4.8.1.1.2.a. d, and e, the licensee proposed that the continuous rating be changed to a band of 3900-4100 XW from the present ratino of 4250 KW. The basis for this change is to take into account the potential for instrument inaccuracies and meter reading errors. However, the periodic testing of DG units prescribed by Regulatory Guide 1.108 requires the DG to demonstrate full-load-carrying capability (continuous rating).
This item is still under review and will be addressed at a later date.
8605300585 860520 DR ADOCK 0500 5
.. The licensee has also proposed a revision to T.S. Table 4.8-1 which changes the DG test frequencies from every 3, 7,14 or 31 days, depending on failure history, to 7 or 31 days depending on failure history resulting in an overall reduction in DG starts.
Also, the test frequencies are now on a per DG basis rather than per nuclear unit basis. This prevents testing of all DGs due to failure experienced on one DG and results in reduced DG starts. Th'ese changes are consistent with the intent of GL 84-15 to reduce the frequency of DG starts, thereby decreasing engine wear and increasing reliability. We have reviewed this request and find that the changes to T.S. Table 4.8-1 are acceptable.
The licensee has proposed to regroup the surveillance requirements to clarify the requirements and increase their useability. We have reviewed these adminis-trative changes to the T.S. and find them acceptable.
The licensee has also proposed revision to other sections of T.S. 3/4.8.1, "AC Sources," including the proposed reduction in a test frequency to once per refueling. Those revisions are still under review along with the continuous rating and will be addressed at a later date.
3 III. ENVIRONMENTAL CONSIDERATION This amendment involves a change in the use of facility components located
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within the restricted area as defined in 10 CFR Part 90 or changes in an inspection or surveillance requirement. The staff has detennined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that this amendment involves no significant harards consideration and there has been no public coment on such finding. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact
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statement or environmental assessment need be prepared in connection with the issuance of this amendment.
IV. CONCLUSION The Commission made a proposed detennination that the amendment involves no significant hazards consideration which was published in the Federal Register (50 FR 29D16) on July 17, 1985, and consulted with the state of South Carolina.
No public coments were received, ard the state of South Carolina did not have any coments.
The staff has 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.
Dated: May 20, 1986 Principal Contributors:
Peter Kong, Electrical, Instrumentation ad Control Systems Branch, DPA Jon R. Hopkins, Pro,iect Directorate #2, DPA.
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