ML20212D561
| ML20212D561 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/14/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20212D559 | List: |
| References | |
| NUDOCS 9909240003 | |
| Download: ML20212D561 (5) | |
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001 os,...../
1 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 200 TO FACILITY OPERATING LICENSE NO. DPR-51 ENTERGY OPERATIONS. INC.
J ARKANSAS NUCLEAR ONE. UNIT NO.1 DOCKET NO. 50-313
1.0 INTRODUCTION
By letter dated April 9,1999, as supplemented July 29,1999. Entergy Operations, Inc.
i (Entergy, the licensee), requested a technical specification (TS) amendment for Arkansas Nuclear One, Unit 1 (ANO-1). The amendment request is related to the ANO-1 station batteries and the switchyard distribution system 125 voit direct current (DC) sources. The staff identified several changes that were required to the proposed TSs and identified the necessary changes to the licensee. The July 29,1999, letter revised the proposed actions associated with
' inoperable 125 voit DC electrical power subsystems, added a monthly surveillance requirement for pilot cell electrolyte temperature, and revised several statements in the TS Bases, and did not change the initial proposed no significant hazards consideration determination.
2.0 BACKGROUND
- The Class 1E 125 volt DC electrical system at ANO-1 consists of two independent, physically and electrically separated 125 volt batteries. Each 125 voIt DC bus is supplied by a battery charger with the associated battery floating on the bus. A second battery charger on each bus serves as a standby charger. These four chargers are supplied from separate 480 volt, Class 1E motor control centers. Each battery charger is rated at 400 amperes (A) and is capable of restoring the battery capacity from the design minimum charge to full charge within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying the normal steady state loads. In case of battery charger failure, the battery will supply power to the loads without interruption. Each battery is sized to carry the
? continuous emergency DC and vital alternating current (AC) loads 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 /> in addition to supplying power for the operation of momentary loads during the 2-hour period. The battery capacity at 80 percent of nameplate rating will correspond to the warranted capacity at the end of the life cycle and full design demand.
, ' The non Class 1E DC control power for the 500 kilovolt (kV) and 161 kV switchyard breakers at the ANO-1 switchyard can be supplied from three different sources: (1) a 125 voit DC battery
. located in the switchyard control building; (2) the battery charger located in the switchyard.
control building; and (3) the ANO-1 DC bus "D41," a non-1E power supply. Currently, the requirements for the switchyard DC sources are a part of the TSs.
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. 3.0 -
EVALUATION 3.1 Relocation of Switchvard DC Sources i
The licensee proposed to relocate the present requirements, TS 3.7.1.E, and actions, TS 3.7.2.G, associated with inoperable DC sources to the 125 volt DC switchyard distribution system to a document under licensee control, specifically, the Technical Requirements Manual (TRM). The licensee also proposes to revise the title of TS 4.6.2, " Station Batteries and
. Switchyard Batteries," to "DC Sources and Battery Cell Parameters." Since the TRM is incorporated by reference into the Updated Final Safety Analysis Report (UFSAR) and maintained under the process described in Section 50.59 of Title 10 of the Code of Federal Regulations (10 CFR), and the relocated surveillance requirements do not satisfy any of the four criteria of 10 CFR 50.36 for inclusion in the TSs, the proposed relocation is acceptable.
'3.2 Revision to Class 1E DC Sources The licensee proposed to combine the requirements of TS 3.7.1.D (Requirements for Batteries Operability), TS 3.7.2.E (Inoperable Battery Chargers), and TS 3.7.2.F (inoperability of the
- Station Batteries) into a new requirement, TS 3.7.3.
The existing TS 3.7.2.F states:
One of the two station batteries and the associated distribution system may be inoperable for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided that there are no inoperable safety related components associated with the remaining station battery which are redundant to the inoperable station battery and the operability of the diesel generator is verified immediately. If the battery is not returned to service at the end of the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, Specification 3.7.2.A shall apply.
This provision was omitted in the licensee's proposal dated April 9,1999. The licensee, in its letter dated July 29,1999, stated that "ANO proposes to retain the current TS 3.7.2.F required actions associated with an inoperable station battery or distribution system." Therefore, the existing requirements are retained to compensate for the extended allowed outage time (AOT) of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.'
Proposed TS 3.7.3 incorporates the requirements for operability of the DC electrical power subsystem and TS 3.7.3.A provides the required actions in the event the requirements of TS 3.7.3 are not met. The combination of TS 3.7.1.D, TS 3.7.2.E, and TS 3.7.2.F into TS 3.7.3 is editorial in nature, and, therefore, acceptable to the staff.
The licensee proposed the addition of TS 3.7.3.B, which would p'rovide the required action if the requirements or AOTs of TS 3.7.3.A could not be met. The proposed requirements are consistent with existing action statements e'xcept that an allowance to remain in hot shutdown
' for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> has been removed. The staff concluded that TS 3.7.3.B is more restrictive than the existing requirements, consistent with the intent of NUREG-1430," Standard Technical Specifications - Babcock and Wilcox Plants," and, therefore, acceptable.
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. The licensee proposes to add a new TS 3.7.4 (Battery Cell Parameters) to the TSs. The specification requires the battery parameters to be within limits when the DC electrical subsystem is required to be operable. TSs 3.7.4.A,3.7.4.B, and 3.7.4.C provide the required actions and AOTs in the event the battery cell parameters are not within Table 4.6-1 (Battery Cell Surveillance Requirements). The table includes the requirements for electrolyte level, float voltage, and specific gravity for the designated pilot cell and each connected cell. The values of the requirements are consistent with NUREG 1430, IEEE-450, " Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications" (1995), and are modified to reflect the vendor recommendations. Therefore, the staff considers the values used in Table 4.6-1 acceptable.
Proposed TS 3.7.4.A provides the required actions and AOTs in the event battery cell parameters are not within the Table 4.6-1 Category A or B limits.
Proposed TS 3.7.4.B provides the required actions to be taken if the required actions and AOTs of TS 3.7.4.A.1, 3.7.4.A.2, or 3.7.4.A.3 are not met (immediately declare the battery
' inoperable).
Proposed TS 3.7.4.C provides the required actions for one or more batteries with average electrolyte temperature of representative cells not within the limits (260 "F) or one or more battery cell parameters not within Table 4.6-1 Category C limits (declare the battery inoperable).
The staff found the addition of TS 3.7.4 more restrictive than ANO-1's existing requirements and at least as conservative as described in NUREG-1430. Therefore, the staff finds the addition of TS 3.7.4 acceptable.
ANO-1 proposed to change the title of TS 4.6.2 from " Station Batteries and Switchyard Batteries" to "DC Sources and Battery Cell Paramaters," to reflect the change in scope of the 4
TS. The licensee also proposes to make the following modifications:
(a)
TS 4.6.2.1 is revised to verify the battery terminal voltage to be greater than or equal to 124.7 volts on float charge once each 7 days. The voltage requirements are based on nominal design voltage of the battery (2.15 volts per cell average) and recommendation of the battery manufacturer. This verification ensures the effectiveness of the charging system and the ability'of the battery to perform its intended function. Accordingly, this
- change is acceptable.
.(b)-
The present ANO-1 TS does not require a service test of the battery. The licensee is revising TS 4.6.2.2 to perform a service test or a modified performance test every 18 months, which will confirm that the battery has the capability, as found, to perform the design requirements of the DC systems. This is consistent with IEEE-450 (1995) and is acceptable.
'(c)
.-TS 4.6.2.3 requires conducting a performance discharge test every 18 months to determine the battery capacityc ANO 1 proposos to revise TS 4.6.2.3 to require a performance test or modified performance test every 60 months; once every 24 months when the battery has reached 85 percent of its service life with a capacity of greater than or equal to 100 percent; and once every 12 months when the battery shows j
degradation or has reached 85 percent of the service life and the capacity is less than l
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4 100 percent of the manufacturer's rating. The requested change is consistent with industry practice and the recommendation of IEEE-450 (1995) and is acceptable.
(d)
ANO 1 added TS 4.6.2.5 to require the verification of pilot celllimits (Category A of Table 4.6-1) every 7 days. These limits are consistent with NUREG-1430, manufacturer recommendations, and IEEE-450 (1995), and, therefore, are acceptable.
(e)
TS 4.6.2.6 has been added to verify, every 92 days, the average electrolyte temperature of representative cells is greater than or equal to 60 *F. This is based on the recommendation of IEEE-450 and is, therefore, acceptable.
(f)
TS 4.6.2.7 has been added to require the verification of the limits for each connected cell (Category B of Table 4.6-1). These are consistent with the recommendations of the manufacturer and IEEE-450, and are, therefore, acceptable.
(g)
The licensee added TS 4.6.2.8: " Verify electrolyte temperature of pilot cellis 2 60 *F once per 31 days." This is consistent with the recommendation of IEEE-450 and is, therefore, acceptable.
The licensee added or revised the present TS Bases associated with the revised limiting conditions for operation's required actions and surveillance requirements. These proposed additions and revisions clarify the proposed requirements and are, therefore, acceptable.
3.3 Evaluation Conclusion Based on the discussion included in paragraphs 3.1 and 3.2, the staff finds Entergy's amendment request acceptable.
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4.0 STATE CONSULTATION
in accordance with the Commission's regulations, the Arkansas State official was notified of the proposed issuance of the amendment. The State official had no comments.
5.0 ENVIRONMENTAL CONSIDERATION
The amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes surveillance requirements. The NRC staff has determined 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 previous,1y issued a proposed finding that the amendment involves no significant hazards consideration, and there has been no public comment on such finding (64 FR 27321 dated May 19,1999). Accordingly, the 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 environmentalimpact statement or environmental assessment need be prepared in connection with the issuance of the amendment.
6.0 CONCLUSION
- 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, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: S.Saba Date:
September 14, 1999 1
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