ML13331A844

Proposed Tech Specs Incorporating Generic Ltr 84-15 Recommendations Re Actions to Improve & Maintain Diesel Generator Reliability

ML13331A844
Person / Time
Site:	San Onofre
Issue date:	11/28/1984
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML13331A843	List: L-84-015, Application for Amend to License DPR-13,incorporating Generic Ltr 84-15 Recommendations Re Actions to Improve & Maintain Diesel Generator Reliability Into Tech Specs.Fee Paid ML13331A844
References
GL-84-15, TAC-55900, TAC-60369, NUDOCS 8512260112
Download: ML13331A844 (8)

Text

ENCLOSURE I 3.7 AUXILIARY ELECTRICAL SUPPLY APPLICABILITY:

Applies to the availability of electrical power for the operation of the plant auxiliaries.

OBJECTIVE:

To define those conditions of electrical power availabil ity necessary (1) to provide for safe reactor operation, (2) to provide for the continuing availability of engineered safeguards, and (3) to ensure that the station 72 can be maintained in the shutdown or refueling condition 5/3/83 for extended time periods.

SPECIFICATION:

I. In Modes 1, 2, 3 and 4 the following specifications 84 shall apply:

11/14/84 A. As a minimum the following shall be OPERABLE:

1.

One Southern California Edison Company and one 84 San Diego Gas & Electric Company high voltage 11/14/84 transmission line to the switchyard and two transmission circuits from the switchyard, one immediate and one delayed access, to the onsite safety-related distribution system.

This configuration constitutes the two required offsite circuits.

2. Two separate and independent diesel generators each with:

a. A separate day tank containing a minimum of 290 gallons of fuel,

b. A separate fuel storage system containing 34 a minimum of 37,500 gallons of fuel, and 4/1/77

c. A separate fuel transfer pump.

3. AC Distribution

a. 4160 Volt Bus 1C and 2C,

b. 480 Volt Bus No. 1, Bus No. 2 and Bus No.

3, and

c. Vital Bus 1, 2, 3, 3A, 4, 5 and 6.

4. DC Bus No. 1 and DC Bus No. 2 (including at least one full capacity charger and battery 84 supply per bus).

11/14/84

5. The two Safety Injection System Load Sequencers.*

• The automatic load function may be blocked in Mode 3 at a pressure <

1900 psig.

8512260112 851219 PDR ADOCK 05000206 P

PDR 3-80 Revised:

11/28/84

B.

Action 84

1. With one of the required offsite circuits 11/14/84 inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Periodic 34 Testing Requirements A and B.1.a of Technical 4/1/77 Specification 4.4 within one hour and at least once per eight (8) hours thereafter; restore an additional offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

2. If one diesel generator is declared inoper-84 able, demonstrate the OPERABILITY of the two 11/14/84 offsite transmission circuits and the remaining diesel generator by performing Periodic Testing Requirements A and B.1.a of 34 Technical Specification 4.4 within one hour 4/1/77 and at least once per eight (8) hours there after; restore the inoperable diesel generator to service within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

3. With one offaite circuit and one diesel gener-84 ator of the above required AC electrical power 11/14/84 sources inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Periodic Testing Requirements A and 34 B.1.a of Technical Specification 4.4 within 4/1/77 one hour and at least once per eight (8) hours thereafter; restore at least one of the inoperable sources to OPERABLE status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Have at least two offaite circuits and two diesel generators OPERABLE within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

4. With two required offsite circuits inoperable, 84 demonstrate the OPERABILITY of two diesel 11/14/84 generators by performing Periodic Testing Requirement B.1.a of Technical Specification 4.4 within one hour and at least once per eight (8) hours thereafter, unless the diesel generators are already operating; restore at 34 least one of the inoperable sources to 4/1/77 OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

With only one of the required offsite circuits restored, restore the remaining offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> 84 from the time of initial loss or be in COLD 11/14/84 SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

3-81 Revised:

11/28/84

5. With two of the above required diesel generators inoperable, demonstrate the OPERABILITY of two offsite circuits by performing Periodic Testing Requirement A of Technical Specification 4.4 within one hour and at least once per two (2) hours there after; restore at least one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

Restore both diesel generatorsto OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

6.

With less than the above complement of AC buses OPERABLE, restore the inoperable bus within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

7.

With one required DC bus inoperable, restore the inoperable bus to OPERABLE status within 2 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br /> or be in COLD SHUTDOWN within the next 11/14/84 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

8.

With a required DC bus battery and both of its chargers inoperable, restore the inoperable battery and one of its chargers to operable status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in cold shutdown within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

9.

With one Safety Injection Load Sequencer inoperable, restore the inoperable sequencer to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

II. Additionally, in Modes 1, 2 and 3 the following specifications shall apply:

A. As a minimum, the following shall be OPERABLE:

1. The MOV850C Uninterruptable Power Supply (UPS).

B.

Action

1. With the MOV850C UPS inoperable, restore the UPS to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

3-82 Revised:

11/28/84

III.

In Modes 5 and 6 the following specifications shall apply:

A. As a minimum, the following shall be OPERABLE:

1. One Southern California Edison Company or San Diego Gas and Electric Company high voltage transmission line to the switchyard and one transmission circuit from the switchyard, immediate or delayed access, to the onsite safety-related distribution system.

2. One diesel generator (capable of automatic start) with:

a. A day tank containing a minimum 290 gallons of fuel,

b. A fuel storage system containing a minimum of 37,500 gallons of fuel, and

c.

A fuel transfer pump.

3. The electrical Buses associated with the operable power sources as follows:

84

a.

One 4,160 Volt AC Bus 11/14/84

b. One 480 Volt AC Bus

c. AC Vital Buses 1, 2 and 4, and

d. One DC Bus (including at least one full capacity charger and battery supply per Bus).

B. Action:

1. With less than the minimum required AC and DC electrical sources specified in III.A above, suspend all operations involving core alterations or positive reactivity changes.

Basis:

The station is connected electrically to the Southern California Edison Company and San Diego Gas & Electric 52 Company system via either of two physically independent 9/26/79 high voltage transmission routes composed of four Southern California Edison Company high voltage lines and of a minimum of three San Diego Gas & Electric Company high voltage lines.

3-83 Revised:

11/28/84

Of thefour Southern California Edison Company lines, any one can serve as a source of power to the station 56 uxiliaaies Etany time.

Similarly, any of the three San 2/6/81 Diego Gas & Electric Company lines can serve as a source of power to the station auxiliaries at any time.

By specifying one transmission line from each of the two physically independent high voltage transmission routes, redundancy of sources of auxiliary power for an orderly shutdown is provided.

Similarly, either transformer A or B, along with transformer C, provide redundancy of 4160 volt power to 84 the auxiliary equipment, and in particular to the safety 111/24/84 injection trains.

Correct operation of the safety injection system is assured by the operability of the load sequencers and the UPS for OV 850C. In addition, each 4160 volt bus has an onsite diesel generator as backup.

Two diesel generators are provided primarily to give redundancy for maintenance, to preclude the necessity for 34 reactor shutdown if one diesel requires maintenance, and 4/1/77 to provide protection against a failure of one of the diesel generator systems.

This also eliminates the necessity for depending on one diesel generator to operate for extended periods without shutdown if it were required for post-accident conditions.

The requirement for one source of offsite power and one diesel generator to be OPERABLE during COLD SHUJTDOWJN or 72 REFUELING conditions will provide diverse and redundant 5/3/83 electrical power sources In order that the station can be maintained in the COLD SHUTDOWJN or REFUELING condition for extended time periods.

Additionally, this requirement will assure that operations involving core alterations or positive reactivity changes can be conducted safely.

3-84 Revised:

11/28/84

ENCLOSURE II I.

Action statements 1 through 5 of Technical Specification 3.7.I.B will be changed to read as follows:

B. Action

1. With one of the required offsite circuits inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Surveillance Requirement A of Technical Specification 4.4 within one hour and at least once per eight (8) hours thereafter and Surveillance Requirement B.l.a within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; restore an additional offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

2. If one diesel generator is declared inoperable, demonstrate the OPERABILITY of the two offsite transmission circuits and the remaining diesel generator by performing Surveillance Requirement A of Technical Specification 4.4 within one hour and at least once per eight (8) hours thereafter and Surveillance Requirement B.1.a within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; restore the inoperable diesel generator to service within 7 days* or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

3. With one offsite circuit and one diesel generator of the above required AC electrical power sources inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Surveillance Requirement A of Technical Specification 4.4 within one hour and at least once per eight (8) hours thereafter and Surveillance Requirement B.1.a within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; restore at least one of the inoperable sources to OPERABLE status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

Have at least two offsite circuits OPERABLE within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Restore the inoperable diesel generator to service within 7 days* from the time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

4. With two required offsite circuits inoperable, demonstrate the OPERABILITY of two diesel generators by performing Surveillance Requirement B.l.a of Technical Specification 4.4 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, unless the diesel generators are already The aggregate of the combined out of service times for the two diesel generators (exclusive of plant operation in Modes 5 and 6) during any consecutive 365 day period shall not exceed 800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> without notification to the NRC. A diesel generator shall be considered to be out of service (inoperable) from the time of initial loss until it satisfies Surveillance Requirement B.1.a of Technical Specification 4.4.

-2 operating; restore at least one of the inoperable sources to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. With only one of the required offsite circuits restored, restore the remaining offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

5. With two of the above required diesel generators inoperable, demonstrate the OPERABILITY of two offsite circuits by performing Surveillance Requirement A of Technical Specification 4.4 within one hour and at least once per two (2) hours thereafter; restore at least one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Restore both diesel generators to OPERABLE status within 7 days* from the time of initial loss or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

II. The "Basis" to Technical Specification 3.7 will be changed to read as follows:

Basis:

The station is connected electrically to the Southern California Edison Company and San Diego Gas & Electric Company system via either of two physically independent.high voltage transmission routes composed of four Southern California Edison Company high voltage lines and four San Diego Gas &

Electric Company high voltage lines.

Of the four Southern California Edison Company lines, any one can serve as a source of power to the station auxiliaries at any time. Similarly, any of the four San Diego Gas & Electric Company lines can serve as a source of power to the station auxiliaries at any time.

By specifying one transmission line from each of the two physically independent high voltage transmission routes, redundancy of sources of auxiliary power for an orderly shutdown is provided.

The aggregate of the combined out of service times for the two diesel generators (exclusive of plant operation in Modes 5 and 6) during any consecutive 365 day period shall not exceed 800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> without notification to the NRC. A diesel generator shall be considered to be out of service (inoperable) from the time of initial loss until it satisfies Surveillance Requirement B.1.a of Technical Specification 4.4.

-3 Similarly, either transformer A or B, along with transformer C, provides redundancy of 4160 volt power to the auxiliary equipment, and in particular to the safety injection trains. Correct operation of the safety injection system is assured by the operability of the load sequencers and the UPS for MOV 850C. In addition, each 4160 volt bus has an onsite diesel generator as backup.

In MODES 1, 2, 3 and 4, two diesel generators provide the necessary redundancy to protect against a failure of one of the diesel generator systems or in case one diesel generator system is taken out for maintenance, without requiring a reactor shutdown. This also eliminates the necessity for depending on one diesel generator to operate for extended periods without shutdown if it were required for post-accident conditions. In accordance with Reference (1), placing an individual as well as a cumulative annual time limit on diesel generator inoperability insures that all scheduled and unscheduled diesel related repair and maintenance in Modes 1, 2, 3 and 4 are performed with due consideration given to optimum diesel generator availability and redundancy.

In MODES 5 and 6, the requirement for one source of offsite power and one diesel generator to be OPERABLE will provide diverse and redundant electrical power sources in order that the station can be maintained in the COLD SHUTDOWN or REFUELING condition for extended time periods.

Additionally, this requirement will assure that operations involving core alterations or positive reactivity changes can be conducted safely.

Reference:

(1) NRC's Generic Letter 84-15, dated July 2, 1984, Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability IAA:3243F