ML20035B062
| ML20035B062 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 03/22/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20035B056 | List: |
| References | |
| NUDOCS 9303310060 | |
| Download: ML20035B062 (3) | |
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f WASHINGTON D C 205S5 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION C:Et ATED TO AMENDMENT NO. 58 TO FACILITY OPERATING LICENSE NPF-68 AND AMENDMENT NO. 37 TO FACILITY OPERATING LICENSE NPF-81 t
V0GTLE ELECTRIC GENERATING PLANT. UNITS 1 AND 2 DOCKET NOS. 50-424 AND 50-425
1.0 INTRODUCTION
By letter dated August 31, 1992, as superseded February 2, 1993, Georgia Power Company, et al. (the licensee), proposed license amendments to change the Technical Specifications (TSs) for Vogtle Electric Generating Plant (Vogtle or the facility), Units 1 and 2.
The proposed amendments would revise TS 4.8.1.1.2.h.7 and its associated footnote== to remove the requirement that the diesel generators (DGs) be tested by performing the loss-of-offsite power / engineered safety features actuation system (LOOP /ESFAS) test specified by TS 4.8.1.1.2.h.6)b) within 5 minutes af ter completing the 24-hour test. Instead, the change would substitute the requirement to start the DG in accordance with TS 4.8.1.1.2.a.4 witniri 5 minutes after the 24-hour test..
TS 4.8.1.1.2.a.4 requires that the DGs be verified to start using one of several specified start signals and that the generator achieve specified voltage and frequency within a certain time.
Specif1cally:
1.
T5 4.8.1.1.2.h.7 requires, in part, that the DGs be tested periodically.
during shutdown, by operating them at specified loads for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and that "Within 5 minutes after completing this 24-hour test, perform Specification 4.8.1.1.2.h.6)b)."
This sentence would be changed to read "Within 5 minutes after completing this 24-hour test, perform Specification 4.8.1.1.2a.4"
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The associated footnote to Specification 4.8.1.1.2.h.7 reads:
l If Specification 4.8.1.1.2.h.6)b) is not satisf actorily completed, it is not necessary to repeat the preceding 24-hour test.
Instead, the diesel generator may be operated at the load required by Surveillance Requirement 4.8.1.1.2.a5 kW for I hour or until operating temperature has stabilized.
The footnote would be changed to read:
If Specification 4.8.1.1.2a.4 is not satisfactorily completed, it is not necessary to repeat the preceding 24-hour test.
Instead, the diesel generator may be 9303310060 930322 DR ADOCK 0500 4
, operated at the load required by Surveillance Requirement 4.8.1.1.2.a5 for a minimum of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
2.0 EVALUATION The primary purpose of performing a LOOP /ESFAS test within 5 minutes of the 24-hour test is to demonstrate the ability of the DG to restart shortly after being shut down following prolonged operation at or near full power (i.e., a hot restart test).
This verifies that mechanical expansion of engine components following shutdown of the engine does not prevent the DG from restarting.
Performance of the LOOP /ESFAS test is required by TS 4.8.1.1.2.h.6)b) and is not changed by the proposed amendments.
Performing a LOOP /ESFAS test in conjunction with a hot restart test is repetitive.
The staff has determined that the hot restart test can be accomplished using i
any of the start signals required by TS 4.8.1.1.2.a.4, since the' hot restart test verifies the mechanical capabilities of the engine and is not a verification of the DG control system or actuation logic.
The staff has concluded that the replacement of the LOOP /ESFAS test with the requirement to start the DG in accordance with TS 4.8.1.1.2.a 4 within 5 minutes after the i
24-hour test is sufficient to demonstrate hot restart capability, and the proposed change is, therefore, acceptable.
The staff has also determined that modifying TS 4.8.1.1.2'.h.7 footnote 4 to i
require operation of the DG for a minimum of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at the load required by:
TS 4.8.1.1.2.a.5 will allow the DG to achieve an acceptable temperature for conducting the hot restart test.
Therefore, the staff, finds the modification to footnote ** to be acceptable.
i Accordingly, the 11RC staff finds that the proposed changes are acceptable.
The staff also notes that similar changes have been accepted for several other facilities and that these changes have been incorporated into the Technical Specification Improvement Program.
l 3.0 STATE C0tJSULTAT10f1
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In accordance with the Commission's regulations, the Georgia State official was notified of the proposed issuance of the amendments.
The State official had no comments.
4.0 ENVIRONMEllTAL CONSIDERATION The amendments change surveillance requirements.
The staff has determined that the amendments involve 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 irk individual or cumulative occupational exposure.
The Commission has previously issued a proposed finding that the amendments involve no significant hazards consideration and there has been no public comment on such finding (57 FR 45084 dated September 30, 1992, and 58 FR 8999 dated February 18, 1993),
Accordingly'. the amendments meet the eligibility criteria for categorical exclusion set forth
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' in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of these amendments.
5.0 C0tJCLUSI0t1 The Commission 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 these amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributors: D. Hood J. Ganiere P. Balmain i
Date:
March 22, 1993 I
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