ML20138Q297

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Proposed Unit 1 Tech Specs Addressing Emergency Diesel Generator Reliability Concerns Found During Similar Unit 2 Tech Spec Approval.Typos & One Inconsistency Corrected in Unit 2 Tech Specs
ML20138Q297
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 12/19/1985
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20138Q280 List:
References
NUDOCS 8512270134
Download: ML20138Q297 (24)
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ATTACHMENT 1 Proposed Technical Specific- 1 Changes Unit 1 8512270134 851219 PDR ADOCK 05000338 P PDR

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3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A. C. SOURCES

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OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.'C. electrical power sources shall be OPERABLE:

a. Two physically independent circuits between the of f::ite transmission network and the onsite Class IE distribution systes, and

'b. Two separate and. independent diesel generators:

1. Each with a separate day tank containing a minimum of 750 gallons of fuel, and
2. A fuel storage system containing a minimum of 45,000 gallons of fuel, and
3. A separate fuel transfer pump.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With one offaite circuit of 3.8.1.1.a inoperable, demonstrate the OPERABILITY of the remaining A. C. sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If either EDG has not been successfully tested within the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, demonstrate its OPERABILITY by performing Surveillance Requirement 4.8.'1.1.2.a.4 separately for each such EDG within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore the 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 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />,
b. With one diesel generator of 3.8.1.1.b inoperable, demonstrate the 1 OPERABILITY of the A.C. offsite sources by performing Surveillance '

Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereaf ter; and if the EDG became inoperable due to any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE EDG by performing Surveillance Requirement 4.8.1.1.2.a.4 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *; restore the diesel generator 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

NORTH ANNA - UNIT 1 3/4 8-1 Amendment No.

ELECTRICAL' POWER SYSTEMS LIMITING CONDITION FOR OPERATION ACTION (Continued):

c. With one offsite circuit and one diesel generator inoperable, demon-strate the OPERABILITY of the remaining A. C. sources by performing Surveillance Requirements 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter; and if the EDG became inoperable due to any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE EDG by perform-ing Surveillance Requirement 4.8.1.1.2.a.4 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *; restore 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 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore the other A.C. power source (offsite circuit or diesel ger.erator) to OPERABLE status in accordance with the provisions of Section 3.8.1.1 Action Statement a or b, as appropriate with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable A.C. power source. A successful test of diesel OPERABILITY per Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement for an OPERABLE diesel or a restored to OPERABLE diesel satisfies the EDG test requirement of Action Statement a or b.
d. With two of the required offsite A.C. circuits inoperable, demonstrate the OPERABILITY of two diesel generators by sequentially performing Surveillance Requirement 4.8.1.1.2.a.4 on both diesels 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 operating; restore one of the inoperable offsite 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 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. Following restoration of one offsite source, follow Action Statement a with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable offsite A.C.

circuit. A successful test (s) of diesel OPERABILITY per Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement for the OPERABLE diesels satisfies the EDG test requirement of Action Statement a.

e. With two of the above required diesel generators inoperable, demon-strate the OPERABILITY of two offsite A.C. circuits by performing Surveillance Requirement 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter; restore 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 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Following restoration of one diesel generator unit, follow Action Statement b with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable diesel generator. A successful test of diesel OPERABILITY per Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement for a restored to OPERABLE diesel satisfies the EDG test requirement of Action Statement b.

NORTH ANNA - UNIT 1 3/4 8-2 Amendment No.

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ELECTRICAL' POWER SYSTEMS SURVEILLANCE REQUIREMENTS

  • o 4.8.1.1.1 Each of the above required physically independent circuits between the offsite transmission network and the onsite Class.1E distribution system shall be:

Determined. OPERABLE at least once per 7 days by verifying correct

a. . breaker alignment indicating power availability.
b. Demonstrated OPERABLE at least once per 18 months during shutdown'by manually transferring the onsite Class 1E power supply from the j normal circuit to the alternate circuit.

4.8.1.1.2. Each diesel generator shall be demonstrated OPERABLE:

a In accordance with the frequency specified in Table 4.8.2 on a STAGGERED TEST-BASIS by: l

1. Verifying the fuel level in the day tank.
2. -Verifying the fuel level in the fuel storage tank.

, 3. ~ Verifying the fuel transfer pump can be started and transfers fuel from the storage. system to the day tank, i .

4. Verifying the diesel generator can start ** and gradually ,

accelerate to synchronous speed (900 rpm) with generator voltage and frequency at 4160 2 420 volts and 60 2 1.2 Hz. Subsequently,  ;

verifying.the generator is synchronized, gradually loaded ** to an indicated 2500-2600 KW*** and operates for at least 60 minutes.

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5. Verifying the diesel generator is aligned to provide standby l
j. power to the associated emergency busses.-

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b. At least once per_92 days by verifying that a sample of diesel fuel r

from the fuel storage tank is within the acceptable limits specified in Table 1 of ASTM D975-74 when checked for viscosity, water and sediment.

T, '

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    • This test shall be conducted in accordance with the manufacturer's recommendations regarding engine prelube and warmup procedures, and as applicable regarding loading recommendations.
      • This band is meant as guidance to avoid routine overloading of the engine.

. Loads in excess of this band for special testing under direct monitoring

of the manufacturer or momentary variations due to changing bus loads l shall not invalidate the test.

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l NORTH ANNA - UNIT 1 3/4 8-3 Amendment No.

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. ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.2 (continued) l

c. At least once per 184 days the diesel generator shall be started **

and accelerated to at least 900 rpm in less than or equal to 10 seconds. The generator voltage and frequency shall be 41601420 volts and 6011.2 Hz within 10 seconds after the start signal. The generator shall be manually sychronized to its appropriate emergency >

bus, loaded to an indicated 2500 to 2600 kw*** in less than or equal to 60 seconds, and operate for at least 60 minutes. The diesel -

generator shall be started for this test by using one of the follow-ing signals on a rotating test basis:

a) Simulated loss of offsite power by itself, b) Simulated loss of offsite power in conjunction with an ESF actuation test signal.

c) An ESF actuation test signal by itself.

This test, if it is performed so it coincides with the testing required by Surveillance Requirement 4.8.1.1.2.a.4, may also serve to concurrently meet those requirements as well.

d. At least once per 18 months during shutdown by: l
1. Subjecting the diesel to an inspection in accordance witu procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service.
2. Verifying that, on rejection of a load of greater than or equal to 610 kw the voltage and frequency are maintained with 4160 1 420 volts and 60 2 1.2 Hz.
3. Verifying that the load sequencing timers are OPERABLE with times l within the tolerances shown in Table 4.8-1.
    • This test shall be conducted in accordance with the manufacturer's recommendations regarding engine prelube and warmup procedures, and as applicable regarding loading recommendations.
      • This band is meant as guidance to avoid routine overloading of the engine.

Loads in excess of this band for special testing under direct monitoring of the manufacturer or momentary variations due to changing bus loads shall not fnvalidate the test.

NORTH ANNA - UNIT 1 3/4 8-3a Amendment No.

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ELECTRICAL POWER SYen.MS SURVEILLANCE REQUIREMENTS 4.8.1.1.2 (continued)

4. Simulating a loss of offsite power by itself, and:

a) Verifying de-energization of the emergency busses and load shedding from the emergency busses.

b) Verifying the diesel starts ** on the auto-start signal, energizes the emergency busses with permanently connected loads within 10 seconds, energizes the auto-connected shutdown loads through the sequencing timers and operates for greater than or equal to 5 minutes while its generator is loaded with the shutdown loads. After energization of these loads, the steady state voltage and frequency shall be maintained at 4160 2 420 volts and 60 1 1.2 Hz.

5. Verifying that on an ESF actuation test signal (without loss of offsite power) the diesel generator starts ** on the auto-start signal and operates on standby for greater than or equal to ~5 minutes.
6. Simulating a loss of offsite power in conjunction with an ESF l actuation test signal, and a) Verifying de-energization of the emergency busses and load shedding from the emergency busses.

b) Verifying t c.e diesel starts ** on the auto-start signal, energizes the emergency busses with permanently connected loads within 10 seconds, energizes the auto-connected emergency (accident) loads through the sequencing timers and operates for greater than or equal to 5 minutes and maintains the steady state voltage and frequency at 41602420 volts and I 6021.2 Hz.

c) Verifying that all diesel generator trips, except engine overspeed, generator differential and breaker overcurrent are automatically bypassed upon loss of voltage on the emergency bus and/or a safety injection actuation signal.

    • This test shall be conducted in accordance with the manufacturer's

! recommendations regarding engine prelube and warmup procedures, and as applicable regarding loading recommendations.

l NORTH ANNA - UNIT 1 3/4 8-3b Amendment No.

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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.2 (continued)

7. Verifying the diesel generator operates ** for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to an indicated target value of 2950 kw (between 2900-3000

, kw)*** and during the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, the diesel generator shall be loaded to an indicated 2500 to 2600 kw.*** Within 5 minutes af ter completing this 24-hour test, perform Surveillance Requirement 4.8.1.1.2.d.4.

3. Verifying that the auto-connected loads to each diesel generator do not exceed the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 3000 kw. ,
9. Verifying the diesel generator's capability to:

a) Synchronize with the offsite power source while the generator is loaded with its emergency loads upon a simulated restoration of offsite power.

b) Transfer its loads to the offsite power source, and c) Proceed through its shutdown sequence.

10. Verifying that the following diesel generator lockout features prevent diesel generator starting only when required:

a) Remote Local Selection Switch b) Emergency Stop Switch

e. At least once per 10 years or after any modifications which could affect diesel generator interdependence by starting ** both diesel generators simultaneously, during shutdown, and verifying that both diesel gene-
rators accelerate to at least 900 rpm in less than or equal to 10 seconds.
    • This test shall be conducted in accordance with the manufacturer's recommendations regarding engine prelube and warmup procedures, and as I

applicable regarding loading recommendations.

, ***This band is meant as guidance to avoid routine overloading of the engine.

Loads in excess of this band for special testing under direct monitoring of the manufacturer or momentary variations due to changing bus loads

! shall not invalidate the test.

NORTH ANNA - UNIT 1 3/4 8-3c Amendment No.

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ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.3 Each diesel generator 125-volt battery bank and charger shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that:
1. The electrolyte level of each pilot cell is between the minimum and maximum level indication marks,
2. The pilot cell specific gravity, corrected to 77'F and full electro-lyte level, is 21.200,
3. The pilot cell voltage is 22.08 volts, and i
4. The overall battery voltaga is 2125 volts.
b. At least once per 92 days by verifying that:
1. The voltage of each connected cell is 22.08 volts under float charge and has not decreased more than 0.05 volts from the value observed during the previous test,
2. The specific gravity, corrected to 77'F and full electrolyte level, of each connected cell is 21.200 and has not decreased more than 0.08 from the value observed during the previous test, and l 3. The electrolyte level of each connected cell is between the minimum and maximum level indication marks.
c. At least once per 18 months, by verifying that:
1. The cells, cell plates and battery racks show no visual indication of physical damage or abnormal deterioration.
2. The cell-to-cell and terminal connections are clean, eight and coated with anti-corrosion material.
3. The resistance of each cell-to-cell and terminal connection is 50.01 ohms.
4. The battery charger will supply at least 10 amperes at 125 volts for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
d. At least once per 60 months, during shutdown, by verifying that the battery capacity is at least 80% of the manufacturer's rating when l

subjected to a performance discharge test.

l NORTH ANNA - UNIT 1 3/4 8-4 Amendment No.

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l ELECTRICAL POWER SYSTEMS Table 4.8-2 DIESEL GENERATOR TEST SCHEDULE Number of Failures Number of Failures in in last 100 Valid -

Last 20 Valid Tests

  • Tests
  • Test Frequency s1 54 Once per 31 days 22** 25 Once per 7 days
  • Criteria for determining number of failures and number of valid tests shall be in accordance with Regulatory Position C.2.e of Regulatory Guide 1.108, but determined on a per diesel generator basis.

For the purposes of determining required test frequency, the previous test failure count may be reduced to zero if a complete diesel overhaul to like-new conditions is completed, provided that the overhaul including appropriate post-maintenance operation and testing, is specifically approved by the manufacturer and if acceptable reliability has been demonstrated.

The reliability criterion shall be the successful completion of 14 con-secutive tests in a single series. Ten of these tests shall be in accor-dance with Surveillance Requirement 4.8.1.1.2.a.4; four tests, in accordance with Surveillance Requirement 4.8.1.1.2.c. If this criterion is not satis-fied during the first series of tests, any alternate criterion to be used to transvalue the failure counts to zero requires NRC approval.

    • The associated test frequency shall be maintained until seven consecutive failure free demands have been performed and the number of failures in the last 20 valid demands has been reduced to one.

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l l NORTH ANNA - UNIT 1 3/4 8-4c Amendment No.

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ELECTRICAL POWER SYSTEMS SHUTDOWN LIMITED CONDITION FOR OPERATION 3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERAELE:

a. One circuit between the offsite transmission network and the onsite Class 1E distribution system, and
b. One diesel generator with: -
1. A day tank containing a minimum volume of 750 gallons of fue',
2. A fuel storage system containing a minimum volume.of 45,000 gallons of fuel, and
3. A fuel transfer pump.

APPLICABILITY: MODES S and 6 ACTION:

With less than the above minimum required A.C. electrical power sources 2

OPERABLE, suspend all operations involving CORE ALTERATIONS or positive reactivity changes until the minimum required A.C. electrical power sources are restored to OPERABLE status.

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SURVEILLANCE REQUIREMENTS , 4.8.1.2 The above required A.C. electrical power sources shall ~be demonstrated OPERABLE by the performance of each of the Surveillance Requirements of 4.8.1.1.1, 4.8.1.1.2 and 4.8.1.1.3.

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. NORTH ANNA - UNIT 1 3/4 8-5 Amendment No.

ti 1/4.8 ELECTRICAL POWER SYSTEMS BASE 3 3/4.8.1 and 3/4.8.2 A.C. and D.C. POWER SOURCES AND DISTRIBUTION The OPERABILITY of the A.C. and D.C. power sources and associated y . 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 requirements of General Design Criteria 17 of Appendix "A" to 10 CFR 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 consistent with the initial condition assumptions of the accident analysas and are based upon maintaining at least one of each 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 the other onsite A.C. source.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that 1) 4he facility can te 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 facility status.

The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capacity for Standby Power Supplies", March 10, 1971, and 1.108 " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants",

Revision 1. August 1977 as modified I.y Amendment No. issued L

NORTH ANNA - UNIT 1 B3/4 8-1 Amendment No.

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f ATTACHMENT 2 Discussion Of Prorssed Changes Unit 1

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DISCUSSION OF PROPOSED CHANGES The proposed changes to North Anna Unit 1 Technical Specifications (TS) have been made considering recommendations by the diesel generator manufacturer and are compatible with the recommendations of Generic Letter 84-15. These changes are meant to address diesel reliability concerns that were identified in the recent Unit 2 EDG Technical Specification change.

The proposed changes for Unit 1 are consistent with the recently NRC approved (SER dated April 25, 1985) TS change for Unit 2. The proposed Unit 1 TS clarifies the inconsistent usage of a defined term that currently appears in the Unit 2 TS in Surveillance Requirement (SR) 4.8.1.1.2.c (Attachment 4 and 5 addresses this change for the Unit 2 TS).

Specifically, we are substituting the words " rotating test basis" for the works " STAGGERED TEST BASIS". The original intent of the SR is to require the fast starting and loading of the EDG's once every six months and to sequentially utilize one of the three initiating signals for each of these trat. This proposed change does not alter the original intent of the SR, but provides additional clarification of the requirement.

The proposed changes do not represent a final optimization of testing requirements, however, these proposals will provide positive improvements to diesel generator reliability. Following sufficient experience with our reliability improvement program, we intend to reassess the related specifications for both units and if necessary propose specifications which programatically address diesel reliability.

10CFR50.59 Safety Review Pursuant to 10CFR50.59, we have reviewed the proposed Technical Specificaiton changes and have concluded that no unreviewed safety question exists; (i) the probability of occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report is not increased. Reducing the operability testing frequency and modifying- starting and loading requirements consistent with the diesel manufacturer's recommendations and Generic Letter 84-15 are intended to enhance diesel reliability by minimizing severe test conditions which can lead to premature failures.

In this respect, the proposed changes should serve to enhance overall safety; (ii) the possibility for an accident or malfunction of a different type than any evaluated previously in the safety analysis report is not created. The proposed change affects testing frequency, starting and loading practices only and has no actual impact on any accident analysis; j (iii) the margin of safety as defined in the basis for any Technical 1

Specification is not reduced. The changes in the testing requirements do not affect the capability of the diesels to perform their function.

Rather, the purpose of the changes are to increase overall diesel reliability.

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10CFR50.92 Significant Hazards Review For the same reasons given above in the 50.59 Safety Review, the proposed changes do not pose a significant hazards consideration as defined in 10CFR50.92. The Commission has provided examples (48FR14870) of changes that constitute no significant hazards consideration. Example (i) consists of purely administrative changes and example (vii) includes changes made to " conform to changes in the regulations, where the license change results in very minor changes to facility operations clearly in keeping with the regulations." As stated previously, the proposed changes are similiar to example (i) in that clarifications are made to correct typographical errors and one inconsistent use of terms (STAGGERED TES.T ,

BASIS) found in the present Unit 2 Technical Specifications. Likewise, the proposed changes are similiar to example (vii) in that the changes are consistent with staff recommendations in Generic Letter 84-15, as well as, recently approved Technical Specifications changes for Unit 2. Hence, we conclude that thm proposed change involves no significant hazards considerations.

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e ATTACHMENT 3 Significant Testing and Maintenance Events Unit 1 L

e NORTH ANNA POWER STATION UNIT 1 EMERGENCY DIESEL GENERATOR SIGNIFICANT TESTING AND MAINTENANCE EVENTS EDG DATE PROBLEM CORRECTIVE ACTION

-1H 2-16-79 Failure to reach 900 Check out-second RPM in 10 sec. successful 1H 7-2-79 Spurious trip Check out-cause unknown 1H 9-26-79 Trip after 30 sec. Check out-air accumulation in fuel filter due to prior maintenance-second attempt successful 1H 2-2-80 Trip due to high Pressure Switch crankcase pressure Setpoint Change 1H 2-15-80 Overspeed Trip Check out-oil booster servomotor not bleeding off fast enough 1H . 2-23-80 Overspeed Trip Check out-reset speed control 1H 3-2-80 Overspeed Trip Check out 1H 3-6-80 Overspeed Trip Replace oil booster servomotor and reset gcVernor settings 1H 3-10-80 Trip due to high Check out crankcase pressure 1H 3-11-80 Trip due to high Pressure setpoint crankcase pressure change (air ejector) orifice size changed 4/3/80) 1H 4-3-80 Overspeed Trip Replaced governor booster servomotor, hydraulic assembly and EGA Controller 1H 4-29-84 Voltage regulation Replaced regulator problems card - diode overheating I. .

1H 5-29-84 Trip on high jacket Temperature switch coolant temperature recalibrated 1H 8-7-84 EDG inadvertently over- Check out in accord-loaded to 3600 kw ance with vendor recommendations 1H 2-1-85 Trip on high crankcase Engine repair #3 pressure and overspeed; cylinder liner coolant leaks cracked and upper piston scored; three main bearings and one connecting rod bearing worn-IJ -

10-30-79 Upper crankshaft thrust Replaced thrust bearing found " flashed" bearing during refueling PM IJ 7-14-82 Main bearing #6 and Replaced bearings connecting rod bearing

  1. 6 found " flashed" during outage PM IJ 11-14-84 Spurious trip of output Checkout breaker. EDG did not trip IJ 9-18-85 Trip on high crankcase Replaced #10 pressure cylinder liner, all upper and lower piston assemblies, connecting rods, and rod bearings

ATTACHMENT 4 Proposed Technical Specification Changes Unit 2

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION ACTION (Continued):

c. With one offsite circuit and one diesel generator inoperable, demonstrate the OPERABILITY of the rema!.ning A. C. sources by perform-ing Surveillance Requirements 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter; and if the EDG became inoperable l due to any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the recaining OPERABLE EDG by performing Surveillance Requirement 4.8.1.1.2.a.4 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *; ,

restore 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 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore the other A.C.

power source (offsite circuit or diesel generator) to OPERABLE status in accordance with the provisions of Section 3.8.1.1 Action Statement a or b, as appropriate with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable A.C. power source. A successful test of diesel OPERABILITY per Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement for an OPERABLE diesel or a restored to OPERABLE diesel satisfies the EDG test requirement of Action Statement a or b.

d. With two of the required offsite A.C. circuits inoperable, demonstrate the OPERABILITY of two diesel generators by sequentially performing Surveillance Requirement 4.8.1.1.2.a.4 on both diesels 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 operating; restore one of the inoperable offsite 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 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. Following restoration of one offsite source,. follow Action Statement a with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable offsite A.C.

circuit. .A successful test (s) of diesel OPERABILITY per , Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement M the OPERABLE diesels satisfies the EDG test requirement of Action Statement a.

e. With two of the above required diesel generators inoperable, demon-strate the OPERABILITY of two offsite A.C. circuits by performing Surveillance Requirement 4.8.1.1.1.a within one hour and at least j once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter; restore 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 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Following restoration of one diesel generator unit, follow Action Statement b with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable diesel ge'ne rator. A successful test of diesel 0F'RABILITY per Surveillance Requirement 4.8.1.1.2.a.4 performed under this Action Statement for a restored to OPERABLE diesel satisfies the EDG test requirement of Action Statement b.

. NORTH ANNA - UNIT 2 3/4 8-2 Amendment No.

l

ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.2 (Continued)

The generator shall be manually sychronized to its appropriate emergency bus, loaded to an indicated 2500.- 2600*** kw in less than or equal to 60 seconds, and operate for at least 60 minutes. The diesel generator shall be started for this test by using one of the following signals on a rotating test basis:  !

a) Simulated loss of offsite power by itself.

b) Simulated loss of offsite power in conjunction with an ESF ,

actuation test signal, c) An ESF actuation test signal by itself.

This test, if it is performed so it coincides with the testing required by Surveillance Requirement 4.8.1.1.2.a.4, may also serve to concurrently meet those requirements as well.

d. At least once per 18 months during shutdown by:
1. Subjecting the diesel to an inspectiIon in accordance with procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service,
2. Verifying that, on rejection of a load of greater than or equal to 610 kw the voltage and frequency are maintained with 4160 2 420 volts and 60 1 1.2 Hz.
3. Verifying that the load sequencing timers are OPERABLE with times within the tolerances shown in Table 4.8-1.

. 4. Simulating a loss of offsite power by itself, and:

a) Verifying de-energization of the emergency busses and load shedding from the emergency busses.

b) Verifying the diesel starts on the auto-start signal, energizes the emergency busses with permanently connected loads within 10 seconds, energizes the auto-connected shutdown loads through the sequencing timers and operates for greater than or equal to 5 minutes while its generator is loaded with the shutdown loads. After energization of these loads, the steady state voltage and frequency shall be maintained at 4160 2 420 volts and 60 1 1.2 Hz.

    • This test shall be conducted in accordance with the manufacturer's recommendations regarding engine prelube and warmup procedures, and as applicable regarding loading recommendations.
      • This band is meant as guidance to avoid routine overloading of the engine.

Loads in excess of this band for special testing under direct monitoring of the manufseturer or momentary variations due to changing bus loads shall not invalidate the test.

NORTH ANNA - UNIT 2 3/4 8-4 Amendment No.

e ELF.CTRICAL POWER' SYSTEMS SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

a. One circuit between the offsite transmission network and the onsite Class IE distribution system, and
b. One diesel generator with:
1. A day tank containing a minimum volume of 750 gallons of fuel,
2. A fuel storage system containing a minimum volume of 45,000 gallons of fuel, and
3. A fuel transfer pump.

APPLICABILITY: MODES 5 and 6 ACTION:

With less than the above minimum required A.C. electrical power sources OPERABL", suspend all operations involving CORE ALTERATIONS or positive reactivity changes until the minimum required A.C. electrical power sources are restored to OPERABLE status.

SURVEILLANCE REQUIREMENTS 4.8.1.2 The above required A.C. electrical power sources. shall be demonstrated OPERABLE by the performance of each of the Surveillance Requirements of 4.8.1.1.1, 4.8.1.1.2 and 4.8.1.1.3.

l NORTH ANNA - UNIT 2 3/4 8-10 Amendment No.

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9 ATTACHMENT 5 Discussion of Proposed Changes Unit 2 S

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DISCUSSION OF PROPOSED CHANGES The proposed changes to North Anna Unit 2 Technical Specifications are purely administrative in nature to correct three typographical errors and one inconsistent usage of a defined term.

10CFR50.59 Safety Review Pursuant to 10 CFR 50.59, we have reviewed - the proposed Technical Specification changes and have concluded that no unreviewed safety question exists; (1) the probability of occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report is not increased. The proposed changes will correct three typographical errors and one inconsistent usage of a defined term, and do not alter the the intent of the Technical Specifications. In this respect, the proposed changes are purely administrative in nature; (ii) the possibility for an accident or malfunction of a different type than any evaluated previously in the safety analysis report is not created. Therefore, the proposed changes have no impact on any accident analysis; (iii) the margin of safety as defined in the basis for any Technical Specification is not reduced.

10CFR50.92 Significant Hazards Review For the same reasons given above in the 50.59 Safety Review, the proposed changes do not pose a significant hazards consideration as defined in 10CFR50.92. The Commission has provided examples (48FR14870) of changes that constitute no significant hazards consideration. Example (i) consists of "a purely administrative change to Technical Specifications; for example, a change to achieve consistency throughout the Technical Specifications, correction of an error, or a change in nomenclature." As stated previously, the proposed changes are to correct three typographical errors and one inconsistent usage of a defined term and are purely administrative.

CmtCKVgCHE3 BANK No 01 cwicx No _0188 53 oAre 11/26/85 sescoR so 018804

.tN E DATE INYOICE NO /OR DESCRIPTION l GROSS AMOUNT i DISCOUNT , NET AMOUNT 03 11/16/85 111bl5000 150 00 150 00 APPLICATION FEE 1

l 150 00 l 150 00 ATTACHED CHECK ISSUED AS PAYMENT OF ITEMS USTED ABOVE PLEASE DETACH STUS AND CASH CHECK PROMPTLY A BANK & TR ST COMPANY N.A.

VolD IF NOT CASMED IN 90 DAYS

'AY E X A C TLY O NE HUN D RE D FI F T Y A N D N0/10 0* ** * *** ***** * **** ***** **** * ** ** * *** * ** ****

  • I BK CHECK NO DATE VENDOR NO AMOUNT '

UNITED STATES NUCLEAR 01 018453 11/2b/85 0188086 $150 00 7l" REGULATORY COMMISSION WASHINGTON DC 20555 d

n*0 0 0 0 0 L 9 3 L 7ua s:053100355s:0101.57 OLE LO Lu'

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