ML17332A904
| ML17332A904 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/22/1995 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML17332A902 | List: |
| References | |
| NUDOCS 9508300337 | |
| Download: ML17332A904 (12) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. "
TO FACILITY OPERATING LICENSE NO.
DPR-58 AND AMENDMENT NO.
TO FACILITY OPERATING LICENSE NO.
DPR-74 INDIANA MICHIGAN POWER COMPANY DONALD C.
COOK NUCLEAR PLANT UNIT NOS.
1 AND 2 DOCKET NOS.
50-315 AND 50-316
- 1. 0 INTRODUCTION By letter dated December 20,
- 1993, as supplemented July 19,
- 1994, and February 28,
- 1995, the Indiana Michigan Power Company (the licensee) requested amendments,to the Technical Specifications (TS) appended to Facility Operating
, License Nos.
DPR-58 and DPR-74 for the Donald C.
Cook Nuclear Plant, Unit Nos.
1 and 2.
The purpose of this change was to revise TS Table 4.8-2 from 8-hour to 'composite 4-hour battery emergency loads for AB (Train B) and CD (Train A) batteries.
In addition, the licensee proposed to delete a load from the Train B batteries load list.
Also, the proposed change would modify TS Table 4.8-3 for the Train N batteries to accurately reflect the operational loads of these batteries as recorded in their composite profiles.
The July 19,
- 1994, supplement requested revision of the TS requirements for the 60-month surveillance to include testing requirements for a battery when it shows signs of degradation.
The February 28,
- 1995, supplement requested correction of certain inconsistencies in the TS and requested the addition of a modified performance test when a performance test is conducted in place of a service test.
The inconsistencies included the TS statements of "battery service test" instead of "performance test" for the 60-month surveillance and "Refueling outage discharge tests shall be given to any battery that shows sign of degradation..."
instead of "Annual performance tests...shall be given to any battery that shows signs of degradation...."
The licensee proposed a modified performance test consisting of a 1-minute discharge at the maximum rate specified for the battery, followed by the performance test, where currents during both segments of the modified performance test are greater than or equal to the design-basis duty cycle currents for the battery.
2.0 EVALUATION The staff's evaluation of the licensee's proposed changes to the TS for both units follows.
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- 2. 1 Pro osed Chan e to TS Section 4.8.2.3.2.d for Units 1 and 2 In its July 19,
- 1994, and February 28, 1995, submittals, the licensee proposed to change the D.C.
Cook Nuclear Plant, Units 1 and 2, TS Section 4.8.2.3.2.d.
At present, TS Section 4.8.2.3.2.d reads as follows:
"At least once per 18
- months, perform a battery service test during shutdown (NODES 5 or 6),
by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status the actual or simulated emergency loads for the times specified in Table 4.8-2 with the battery charger disconnected.
The battery terminal voltage shall be maintained greater than or equal to 220 volts throughout this test."
The amended TS section would read:
"At least once per 18 months, perform a
battery service test during shutdown (Nodes 5 or 6) by verifying that the battery.capacity is adequate to supply and maintain in OPERABLE status the actual or simulated emergency loads for the design duty cycle which is based on the composite load profile.
The composite load profile envelopes both the loss-of-coolant-accident/loss-of-offsite-power (LOCA/LOOP) and Station Blackout profiles and provides the basis for the times listed in Table 4.8-2.
The battery charger will be disconnected throughout the test.,
The battery terminal voltage shall be maintained greater than or equal to 219 volts throughout this test."
In its December 20, 1993, submittal, the licensee proposed to change the existing 8-hour battery duty cycles to 4-hour composite duty cycles.
The licensee stated that the existing 8-hour duty cycles contain two distinct requirements:
(1) The nuclear-related dc loads must be supplied by the batteries for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.
This requirement is based on a
LOCA/LOOP event, a failure of the associated battery charger, and a reasonable period in which to restore the battery charger or the spare charger to service.
This 3-hour requirement is included in Chapter 8 of the updated final safety analysis (UFSAR).
(2) Based on the operational experience, the turbine shutdown loads are required for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> to properly cool down oil lubricated components of the main and feed pump turbines.
The licensee stated that D.C.
Cook Nuclear Plant has committed to 4-hour station blackout (SBO) battery duty cycles with load shedding of certain loads 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> into the event.
These two duty cycles form the basis for the proposed 4-hour composite load profiles.
The LOCA/LOOP set of load profiles generally detailed a higher first-minute load and the SBO set yielded a longer loading period.
The composite load profiles were developed to envelop the worst-case profile for each battery and, as such, represent conservative sizing/application of the Class lE batteries.
The staff finds that the proposed TS change complies with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800) and is therefore acceptable.
C
\\ 4 2.2 Pro osed Chan e to TS Section 4.8.2.3.2.e for Units 1 and 2
In its July 19,
- 1994, and February 28, 1995, submittals, the licensee proposed to change the D.C.
Cook Nuclear Plant, Units 1
and 2, TS Section 4.8.2.3.2.e.
At present, the TS section reads as "At least once per 60 months, perform a
battery discharge test during shutdown (MODES 5 or 6),
by verifying that the battery capacity is at least 80X of the manufacturer's rating.
This performance discharge test shall be performed in place of the battery service test."
The amended TS section would read as follows:
"At least once per 60 months, conduct a performance test of battery capacity during shutdown (MODES 5 or 6) by verifying that the battery capacity is at least 80X of the manufacturer's rating.
When this test is performed in place of a battery service test, a modified performance test shall be conducted.
"Annual performance tests of battery capacity shall be given to any battery that shows signs of degradation or has reached 85X of the service life expected for the application.
Degradation is indicated when the battery capacity drops more than 10X from its capacity on the previous performance test, or is below 90X of the manufacturer's rating.
If the battery has reached 85X of service life, delivers a capacity of 100X or greater of the manufacturer's rated capacity, and has shown no signs of degradation, performance testing at two year intervals is acceptable until the battery shows signs of degradation."
The licensee modified this section to make it consistent with the requirements of the Institute of Electrical and Electronics Engineers
( IEEE) Standard 450 (1987) and Standard Technical Specifications.
A modified performance test consists of a 1-minute discharge at the maximum rate specified for the
- battery, followed by the performance test.
Currents during both segments of the modified performance test are greater than or equal to the design-basis duty cycle currents for the battery.
A modified performance test is a test of the capability of the battery to provide a high-current, short-duration load at greater than the minimum design voltage, followed by a test of the capability of the battery to provide sufficient current at above the minimum design voltage for the duration of the design duty cycle.
The staff finds that the proposed TS change complies with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800) and is therefore acceptable.
2.3 Pro osed Chan e to TS Table 4.8-2 for Units 1
and 2
The licensee proposed to change the D.C.
Cook Nuclear Plant, Units 1
and 2, TS Table 4.8-2.
At present, TS Table 4.8-2 is as shown on the following page:
TABL 4.8-2 BATTERY EHERGENCY LOADS AB Batter Loads
- 1. Channel III static inverter 2.
Channel IV static inverter
- 3. Computer static inverter 4.
Feed pump turbine [IE/2E] oil pump
[4.
BOP static inverter *
- 5. Control room emergency lighting
- 6. Hain turbine emergency oil pump
- 7. Isolation valve control
- 8. All control circuits Hinimum Time 3 hrs 3 hrs 3 hrs 1 hr 3 hrs (Unit 2)]
8 hrs 3 hrs 8 hrs 8 hrs CD Batter Loads 1.
Channel I static inverter 2.
Channel II static inverter
[3.
BOP static inverter
- 4.
Feed pump turbine
[1W/2W] oil pump
- 5. Generator seal oil pump
- 6. Hain turbine emergency oil pump
- 7. Isolation valves
- 8. Annunciators
- 9. All control circuits 3 hrs 3 hrs 3 hrs (Unit 1)]
1 hr 5 hrs (8 hrs Unit 1) 3 hrs 8 hrs 8 hrs 8 hrs
- AC power sources to the inverters shall be turned off at the start of the test and may be turned on at the end of the specified time interval.
Inverters may be left in this operating mode for the duration of the discharge test.
The amended Table 4.8-2 is as shown below:
TABLE 4.8-2 BATTERY EMERGENCY LOADS AB Batter Loads Channel III static inverter 2.
Channel IV static inverter
[3.
BOP static inverter
- 3.
East feed pump turbine emergency oil pump
- 4. Control room emergency lighting
- 5. Hain turbine backup oil pump
- 6. Isolation valve control
- 7. All control circuits Minimum Time 4 hrs 4 hrs 4 hrs (Unit 2)]
1 hr 4 hrs 1 hr 4 hrs 4 hrs CD Batter Loads 1.
Channel I static inverter 2.
Channel II static inverter
[3.
BOP static inverter 4.
West feed pump turbine emergency oil pump
- 5. Generator hydrogen emergency seal oil pump
- 6. Hain turbine emergency oil pump
- 7. Isolation valves
- 8. Annunciators
- 9. All control circuits 4 hrs 4 hrs 4 hrs (Unit 1)]
1 hr 4 hrs 1 hr 4 hrs 4 hrs 4 hrs
- AC power sources to the inverters shall be turned off at the start of the test and may be turned on at the end of the specified time interval.
Inverters may be left in this operating mode for the duration of the discharge test.
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The lidensee revised the minimum time of the battery emergency loads to reflect the time duration included in the composite profiles.
The composite profiles of the batteries envelop the worst-case conditions for the station batteries.
Additionally, the computer static inverter load is removed from Table 4.8-2 since this load was physically removed from the AB batteries as a
function of design change.
The power for this load is now supplied from the Technical Support Center Uninterruptible Power Supply System.
The proposed TS change complies with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800).
Therefore, the staff finds the proposed TS change acceptable.
2.4 Pro osed Chan e to TS Section 4.8.2.5.2.e for Units 1
and 2
In. its July 19,
- 1994, and February 28, 1995, submittals, the licensee proposed to change the D.C.
Cook Nuclear Plant, Units 1 and 2, TS Section 4.8.2.5.2.e.
At present, TS Section 4.8.2.5.2.e reads as follows:
"At least once per 60 months perform a battery discharge test during shutdown (MODES 5 or 6),
by verifying that the battery capacity is at least 80X of the manufacturer's rating. This performance discharge test shall be performed in place of the battery service test."
The amended TS would read:
"At least once per 60 months, conduct a performance test of battery capacity during shutdown (MODES 5 or 6),
by verifying that the battery capacity is at least 80X of the manufacturer's rating.
When this test is performed in place of a battery service test, a modified performance test shall be conducted.
"Annual performance tests of battery capacity shall be given to any battery that shows signs of degradation or has reached 85X of the service life expected for the application.
Degradation is indicated when the battery capacity drops more than 10X from its capacity on the previous performance test, or is below 90X of the manufacturer's rating.
If the battery has reached 85X of service life, delivers a capacity of 100X or greater of the manufacturer's rated capacity, and has shown no signs of degradation, performance testing at two year intervals is acceptable until the battery shows signs of degradation."
The licensee modified this section of the TS to make it consistent with the requirements of IEEE Standard 450(1987) and Standard Technical Specifications.
The staff finds that the proposed TS change complies with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800) and is therefore acceptable.
4
,p lg 7 I 2.5 Pro osed Chan e to TS Table 4.8-3 for Units 1 and 2
The licen'see proposed to change the D.C.
Cook Nuclear Plant, Units 1
and 2, TS Table 4.8-3.
At present, TS Table 4.8-3 is as shown below:
TABLE 4.8-3 BATTERY EMERGENCY LOADS "N" Batter Loads Minimum Time Auxiliary feedwater turbine control bus FMO-211 valve FHO-221 valve FMO-231 valve FHO-241 valve TDTV valve
- hrs
- hrs
- hrs
- hrs
- hrs
- Valves. will be operated through the following sequence:
2.
3.
4.
Beginning of test:
open valves Five minutes after the beginning of the test:
close the valves.
Ten minutes after the beginning of the test:
reopen the valves.
Four hours after the beginning of the test:
close the valves.
End of the test.
The amended Table 4.8-3 is as shown below:
TABLE 4.8-3 BATTERY EMERGENCY LOADS "N" Batter Loads Auxiliary feedwater turbine control bus FHO-211 valve FHO-221 valve FHO-231 valve FHO-241 valve TDTV valve Minimum Time 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours
laaa The licensee revised the minimum time column and deleted the operating sequence list of Table 4.8-3.
The licensee stated that these modifications do not change the TS 4-hour duty cycle of the Train N batteries in the TS.
- Rather, the modifications are intended to more accurately reflect the operation of the Train N battery loads as recorded in the composite profiles for these batteries.
The licensee stated that removal of the valve operating sequence portion of the table will have no impact on the testing of the valves to the composite profiles.
The licensee stated that these batteries will be tested to their design-basis duty cycles using simulated loading.
Also, the Train N composite profiles envelop the worst-case conditions for these batteries.
The composite load profiles for the Train N batteries, which remain unchanged at 4-hours duration, are more conservative and more accurately reflect the postulated loads on these batteries than those listed in the TS.
The valve operating sequence list of Table 4.8-3 is deleted because it is no longer used to place actual loads on the Train N batteries during surveillance testing.
The proposed TS change complies with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800).
Therefore, the staff finds the proposed TS change acceptable.
- 2. 6
~Summa r a
By letter dated December 20, 1993, the licensee requested an amendment to the TS for the Donald C.
Cook Nuclear Plant, Units 1 and 2.
The purpose of this change is to revise TS Table 4.8-2 from 8-hour to composite 4-hour battery emergency loads for AB (Train B) and CD (Train A) batteries.
In addition, the licensee proposed to delete a load on the Train B batteries load list.
- Also, this proposed change modifies TS Table 4.8-3 for the Train N batteries to accurately reflect the operational loads of these batteries as recorded in their composite profiles.
The licensee revised its submittal on July 19,
- 1994, and February 28, 1995, to include testing requirements, associated with the 60-month surveillance, for a battery when it shows sign of degradation and the addition of a modified performance test when a performance test is conducted in place of a battery service test.
The staff finds the proposed TS comply with General Design Criterion 17 in Appendix A to 10 CFR Part 50 and Standard Review Plan Section 8.3.2 (NUREG-0800).
Therefore, the requested changes to the TS as discussed in this safety evaluation are approved.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Michigan State official was notified of the proposed issuance of the amendments.
The State official had no comments.
- 4. 0 ENVIRONMENTAL 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 in individual or cumulative occupational radiation 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 (59 FR 4939 and 60 FR 29879).
Accordingly, the amendments meet 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 statement or environmental assessment need be prepared in connection with the issuance of the amendments.
5.0 CONCLUSION
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, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
A. Pal J.
Hickman August 22, 1995
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