ML20205P807

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Proposed Tech Specs,Clarifying Ambiguous Wording Re Diesel Generator.W/Annotation
ML20205P807
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 11/02/1988
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML20205P806 List:
References
NUDOCS 8811080302
Download: ML20205P807 (8)
v • d • e


Text

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October 12, 1988 ATIAClG4ENT_B PROPOSED CHANGES TO IHE TECHNICAL SPECIFICATIONS FOR l

QPERATING LICENSES NPF-11 AND NPF-18 i

BEYlSED_EAGES1 NPF-11 NPF-1R .i i

3/4 8-3 3/4 S-3 B 3/4 8-1 B 3/4 8-1 I

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8G110G0302 881102 PDR P nDOCK 05000373 .

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ELECTRIC'AL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Each of the above required independent circuits between the offsite transmission network and the onsite Class 1E distribution system shall be:

a. Determined OPERABLE at least once per 7 days by verifying correct breaker alignments and indicated power availability, and
b. Demonstrated OPERA 8LE at least once per 18 months during shutdown by manually transferring unit power supply from the normal circuit to the alternate circuit.

4.8.1.1.2 Each of the above required diesel generators shall be demonstrated OPERABLE:#'

a. In accordance with the frequency specified in Table 4.8.1.1.2-1 on a STAGGERED TEST BASIS by: *
1. Verifying the fuel level in the day fuel tank.
2. Verifying the fuel level in the fuel storage tank.
3. Verifying the fuel transfer pump starts and t sf fuel from the storage system to the day fuel tank.
4. Verifying the diesel starts from ambie? condi on and elerates to900 rpm +5%,-2%inlessthanorj 1 to 3 seconds. M The I generator voltage and frequency shall be 4160 i 150 volts and 60 + 3.0, -1.2 Hz within 13 secondM%fter tgr start signal. I
5. Verifying the diesel generator is synchronized, loaded to greater than or equal to 2600 kw within 60 seconds W,and operates with l this load for at least 60 minutes.
6. Verifying the diesel generator is aligned to provide standby power to the associated emergency busses.
7. Verifying the pressure in all diesel generator air start receivers to be greater than or equal to 200 psig.
b. At least once per 31 days and after each operation of the diesel where the period of oper6 tion was greater than or equal to I hour by checking for and removing accumulated water from the day fuel tanks.
c. At least once per 92 days and from new fuel oil prior to addition to the storage tanks by verifying that a sample obtained in accordance 3ScfTt g '\ with ASTM-D270-1975 has a water and sediment content of less than or equal to 0.05 volume percent and a kinematic viscosity 0 40'C of j My O ] greater than or equal to 1.9 but less than or equal to 4.1 when tested in accordance with ASTM-0975-77, and an impurity level of less than 2 mg. of insolubles per 100 ml. when tested in accordance with ASTM-D227b 70. g f

f"inese mesel generator starts from ambient conditions shall be performed at T least once per 184 days in these surveillance tests. All other engine starts for the purpose of this surveillance testing shall be preceded by an engine i prelube period and/or other warmup procedures recommended by the manufacturer k so that mechanical stress and wear on the diesel engine is minimized. /

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J LA SALLE - UNIT 1 3/4 8-3 Amendment No.16

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3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.1 and 3/4.8.2 A.C. SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS The OPERABILITY of.the A.C. and 0.C. power sources and associated i

distribution systems during operation ensures that sufficient power will be available to supply the safety related equipment required for (1) the safe shutdown of the facility and (2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the i

requirements of General Design Criteria 17 of Appendix "A" to 10 CFR 50. '

The ACTION requicements specified for the levels of degradation of the power sources provide restriction upon continued facility operation  ;

commensurate with the level of degradation. The OPERABILITY of the power e sources are consistent with the initial condition assumptions of the accident i analyses and are based upon maintaining at least Division I or II of the onsite A.C. and D.C. power sources and associated distribution systems i.

OPERABLE during accident conditions coincident with an assumed loss of offsite i power and single failure of ono of the two onsite A.C. sources. Division III I i supplies the high pressure core spray (HPCS) system only. .

I The OPERABILITY of the minimum specified A.C. and 0.C. power ecurces and associated distribution systems during shutdown and refueling ensures that

( (1) the facility can be maintained in the shutdown or refueling condition for extended time periods and (2) sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

The surveillance requirements for demonstrating the OPERABILITY of the j diesel generators are in accordance with the recommendations of Regulatory

! Guide 1.9, "Selection of Diesel Generator Set Capacity for Standby Power Sup-plies," March 10, 1971, with the exception noted in Appendix B to the FSAR, and Regulatory Guide 1.108, "Periodic Testing of Diesel Generator Units Used as Onsit9 Electric Power Systems at Nuclear Power Plants," Revision 1 August 1977. A IM*C he diesel generator fast start surveillance requirements, based on a PRA 3

.tudy, are sufficient to demonstrate the onsite A.C. power system capability to ]

mitigate the consequences of the design basis event for the plant, i.e., large i

LOCA coincident with a loss-of-offsite power, while minimizing the mechanical t stress and wear on the diesel engine.

The surveillance requirements for demonstrating the OPERABILITY of the unit batteries are in accordance wit.h the recommendations of Regulatory Guide 1.129, "Maintenance Testing ar.d Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Station and Substations."

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage onfloat charge, connection resistance values and the performance of battery service and discharge tests ensures the eftertiveness o/ the charging system, the ability to handle high

( discharge rates and a mn wes the battery capacity at that time with the rated capacity.

LA SALLE - UNIT 1 8 3/4 8-1 Amendment No.16

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October 12, 1988 HPF-11 INSERT A

  • All planned diesel generator starts performed for the purpose of meeting these surveillance requirements, may be preceded by an engine prelube period, as recommended by the menufacturer.

k INSERT B

    • Surveillance testing to verify the diesel generator start (13 see) and load (60 sec) times from ambient conditions shall be performed at leact once per 184 days. All other engine starts performed for the purpose of meeting these surveillance requirements may be conducted in accordance with warmup and loading procedures, as recoumended by the manufacturer.

This is in order to minimise mechanical stress and wear on the diesel generator caased by f ast starting and loading of the diesel generator.

INSERT C Analysis has shown that testing which includes a semi-annual fast start of the diesel generators is sufficient to demonstrate the capability of the onsite A.C. power systems to mitigate the consequences of the design basis event for the plant (i.e., large LOCA coincident with a loss-of-offsite power), while minimising the mechanical stress and wear on the diesel generator.

ELECTRICAL p0WER SYSTEMS

]4RVEILLANCEREQUIREMENTS 4.8.1.1.1 Each of'the above required independent circuits between the offsite transmission network and the onsite Class 1E distribution system shall be:

a. Determined. OPERABLE at least once per 7 days by verifying correct breaker alignments and indicated power availability, and
b. Demonstrated OPERABLE at least once per 18 months during shutdown by manually transferring unit power supply from the normal circuit to the alternate circuit.

4.8.1.1.2 Each of the above required diesel generators shall be demonstrated OPERABLE:k

a. In accordance with the frequency specified in Table 4.8.1.1.2-1 on a STAGGERED TEST BASIS by: g
1. Verifying the fuel level in the day fuel tank. p 2.

Verifying the fuel level in the fuel storage tank. j g

3. Verifying the fuel transfer pump starts and transf frs fuel from the storage system to the day fuel tank.
4. Verifying the diesel starts from ambient dit n acce,)erates to 900 rpm + 5%, -2% in less than or equa o seco7nTs.MRThe generator voltage and frequency shall be 160 150 volts and 60 + 3.0, -1.2 Hz within 13 secondsH%ft the start signal.
5. Verifying the diesel generator is synchroni d, loaded to greater than or equal to 2600 kW within 60 seconds nd operates with this load for at least 60 minutes. .
6. Verifying the diesel generator is aligned to provide standby power to the asscciated emergency busses.
7. Verifying the pressure in all diesel generator air start receivers to be greater than or equal to 200 psig. .
b. At least once per 31 days and.after each operation of the diesel where the period of operation was greater than or equal to I hour by p] checking for and removing accumulated water from the day fuel tanks.
c. l At least once per 92 days and from new fuel oil prior to addition to 4 the storage tanks by verifying that a sample obtained in accordance fI X with ASTM-0270-1975 has a water and sediment content of less than or equal to 0.05 volume percent and a kinematic viscosity la 40*C of greater than or equal to 1.9 but less than or equal to 4.1 when h[6 tested in accordance with ASTM-D975-77, and an impurity level of less than 2 mg of insolubles per 100 mL when tested in accordance i

[/ with ASTM-D2274-70. '

^hiese diesel generator starts from ambient conditions shall be 'perforced only r c-once per 184 days in these surveillance tests.ahd All other engine starts for -

the purpose of this surveillance testing shall be preceded by an engine i

prelube period and/or other warmup procedures recommended by the manufacturer o that mechanical stress and wear on the diesel engine is minimized.

LA SALLE - UNIT 2 3/4 8-3 4

3/4.8 ELECTRfCAL POWER SYSTEMS BASES 3/4.8.1 and 3/4.8.2 A.C. SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS The OPERABI'.ITY of the A.C. and D.C. power sources and associated distri-bution systems during operation ensures that sufficient power will be available to supply the safety-related equipment required for (1) the safe shutdown of the facility and (2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C.

power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix A to 10 CFR Part 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources are consis-tent with the initial condition assumptions of the accident analyses and are based upon maintaining at least Division I or II of the onsite A.C. and D.C.

power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of-offsite power and single failure of one of the two onsite A.C. sources. Division III supplies the high pressure core spray (HPCS) system only.

The OPERABILITY of the minimum specified A.C. and D.C. peser sources and associated distribution systems during shutdown and refueling ensures that (1) the facility can be maintained in the shutdown or refueling condition for extended time periods and (2) sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

The surveillance requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory ig Guide 1.9, "Selection of Diesel Generator Set Capacity for Standby Power Supplies " March 10, 1971, with the exception noted in Appendix B to the FSAR, h and Regulatory Guide 1.108, "Periodic Testing of Diesel Generator Units Used h as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, g/

[i August 1977. /

~

The diesel generator fast start surveillance requirements, based on a PRA study, are sufficient to demonstrate the onsite A.C. power system capability to I mitigate the consequences of the design basis event for the plant, i.e., large LOCA coincident with a loss of-offsite power, while min mizing the mechanical stress and wear on the diesel enaine.

The surveillance requirements for demonstrating the OPERABILITY of the unit batteries are in accordance with the recommendations of Regulatory Guide 1.129, "Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Station and Substations."

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage onfloat charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.

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. LA SALLE - UNIT 2 B 3/4 8-1

October. 12, 1988 NPT-18 INSERT A

  • All planned diesel generator starts . ) eformed for the purpose of meeting these surveillance requirements, mal Le preceded by an engine prelube period, as recommended by the manufacturer.

INSERT B

    • Surveillance trtting to verify the diesel generator start (13 sec) and load (60 sec) 4 tmes f rom t.ebient conditions shall be performed at least once per 184 64ys. All ethe r engine starts performed for the purpose of meeting these surveillance requirements may be conducted in accordance with warmup and loading procedures, as recommended by the manufacturer.

This is in order to minimize mechanical stress and wear on the diesel generator caused by fast starting and loading of the diesel generator.

INSERT C Analysis has shown that testing which includes a semi-annual fast start of the diesel generators is sufficient to demonstrate the capability of the onsite A.C. power systems to mitigate the consequences of the design basis event for the plant (i.e., large LOCA coincident with a loss-of-offsite power), while minimizing the mechanical stress and wear on the diesel generator.

October 12, 1988 ATIAC19(ENT.C ,

SIGH 1TlCMiT_liA 3 ARDS_CCliSIDIRAILOli ,

Commonwealth Edison has evaluated the proposed Technical Specification Amendment and determined that it does not represent a significant hasards consideration. Based on the criteria for defining a significant hasards consideration established in 10CFR50.92, operation of I LaSalle County Station Units 1 and 2 In accordance with the proposed amendment will not I

1) Involve a significant increase in the probability or consequences of an accident previously evaluated because:

This proposed amendment is an administrative change intended to clarify the requirements for fast start of the diesel generators.

This proposal does not change the Intent of the technical specifications, as defined in the bases and in LaSalle SSER 7 (NUREG-0519) page 16-1.

2) Create the possibility of a s'ew or different kind of accident from any accident previously evaluated because This proposed amendment does not involve any changes to the

! facility or to the operation of the faellity as described in the UFSAR.

3) Involve a significant reduction in the margin of safety because:

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l This proposed amendment does not involve any changes to the facility or to the operation of the facility as described in the UFSAR.

Guidance has been provided in 51 FR 7744 (reference 1), for the application of standards to license change requests for determination of the j existence of significant hazards considerations. This document provides l

examples of snendments which are and are not likely considered to involve significant hasards considerations. This proposed snendment most closely resembles example c(1) of those examples deemed not likely to involve a significant hazards consideration. It is purely an administrative change meant to clarify the requirements.

This proposed swendment does not involve a significant relaxation of the criteria used to establish safety limits, a significant relaxation of the bases for the limiting safety system settings or a significant relaxation of the bases for the 11mitir49 conditions for operations.

Therefore, based on the guidance provided in the Federal Register and the criteria established in 10CFr.50.92(e), the proposed change does not constitute a significant hazards consideration.

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