ML20149L415
| ML20149L415 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 02/15/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20149L401 | List: |
| References | |
| NUDOCS 8802240222 | |
| Download: ML20149L415 (4) | |
Text
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' ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
(
b)
Verifying the diesel starts on the auto-start signal, energizes the emergency busses with permanently connected loads within 11 seconds, energizes the auto-connected emergency (accident) loads through the load sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the emergency loads. After energization, the steady-state voltage and frequency of the emergency busses shall be maintained at 4160 + 420 volts and 60 + 1.2 Hz during this test;** and c)
Verifying that all automatic diesel generator trips, except engine overspeed, low-low lube oil pressure, generator differential, and the 2 out of 3 voltage controlled overcurrent relay scheme, are automatically bypassed upon loss of voltage on the energency bus concurrent with a Safety Injection Actuation signal.
7)
Verifying, during shutdown, 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 />.
The diesel generator shall be loaded to greater than or equal to 5600 kW but less than or equal to 5750 kW. The generator voltage and frequency shall be 4160 + 420 volts and 60 + 1.2 Hz within 11 seconds after the 7
start signal; the steady state generator voltage and frequency shall be maintained within these limits during this test.
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8)
Verifying, during shutdown, that the auto-connected loads to y-each diesel generator do no't exceed 5750 kW;**
9)
Verifying, during shutdown, 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)
Be restored to its standby status.
- 10) Verifying, during shutdown, that with the diesel generator 7
operating in a test mode, connected to its bus, a simulated Safety Injection signal overrides the test mode by: (1) return-ing the diesel generator to standby operation, and (2) automati-cally energizing the emergency loads with offsite power;**
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nunar., te r;;nt the precedir.g : har 02;t.
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% M ;;;r;ted ;t i,reeter ther, er ;;ni te, "00 kW :,.t lee. tMr er ^ ^=1 t-17 50 LU f ; r i he. r 7,7.r.t i l ;;; r;t i r.; ^ -- - - ^ -' ' - - ^ ' ' ' - "
- This surniiiance need not be performed until prior to entering HOT SHUTDOWN following the Unit 1 first refueling.
CATAWBA - UNITS 1 & 2 3/4 8-6 AmendmentNo.N(Unit 1)
AmenyntNo.4(Unit 2) 8802240222 880215 fDR ADOCK0500g3
tO opec.hn3 odr y tec hn ce p&j hj*tskre has. sfafdies/,6 6150 kk) Ar one hwe or wWil o wik O
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' ELECTRICAL POWER SYSTEHs 6 initutNs
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f SURVEILLANCE REQUIREMENTS (Continued) u
- 11) Verifying that the fuel transfer valve transfers fuel from each fuel storage tank to the day tank of each diesel via the in-stalled cross-connection lines;
- 12) Verifying that the automatic load sequence timer is OPERABLE with the interval between each load block within the tolerances given in Table 4.8-2;
- 13) Verifying that the voltage and diesel speed tolerances for the accelerated sequencer permissives are 92.5 21% anj respectively, with a minimum time delay of 2 2 0.L :
- 14) Verifying that the following diesel generator lockout features prevent diesel generator starting only when required:
a)
Turning gear en we( r b)
Maintenance me e; M h.
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 generators accelerate to at least 441 rpm in less than or
(
equal to 11 seconds; and i.
At least once per 10 years by:
1)
Oraining each fuel oil storage tank, removing the accumulated sediment and cleaning the tank using a sodium hypochlorite solution or its equivalent, and 2)
Performing a pressure test of those portions of the diesel fuel oil system designed to Section III, subsection ND of the ASME Coce at a test pressure equal to 110% of the system design pressure.
3)
Performing tank wall thickness measurements.
The resulting data shall be evaluated and any abnormal degradation will be justified or corrected.
Any abnormal degradation will be documented in a report to the Commission.
- 4. 8.1.1. 3 Reports - All diesel generator failures, valid or non-valid, shall be reported in a 5pecial Report to the Commission pursuant to Specification 6.9.2 within 30 days.
Reports of diesel generator failures shall include the informa-tion recommended in Regulatory Position C.3.0 of Regulatory Guide 1.108, Revi-sion 1, August 1977.
If the number of failures in the last 100 valid tests (on a per nt. clear unit basis) is greater than or equal to 7, the report shall be supplemented to include the additional information recommended in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977.
CATAWBA - UNITS 1 & 2 3/4 8-7 AmendmentNo.)$ Unit 1) (
Amendment Nc.)GUnit 2) 9/10/00
Attachment II Discussion And No Significant Hazards Consideration b
DISCUSSION AND NO SIGNIFICANT HAZARDS CONSIDERATIONS The proposed modification of the Technical Specifications would permit testing of the diesel generators for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (or more) test run and a Hot Restart with full ESF load acceptance separately and independently.
Currently these tests are carried out in succession.
Separating these two required tests provides plant operations added flexibility and prevents critical path complications during the outages The proposed testing scheme divides the testing requirement 4.8.1.1.2g.7) into two separate tests. Each test is carried out under conditions which are nearly identical to those of the current tests. The proposed testing scheme provides the same degree of assurance regarding the diesel generator readiness and reliability.
The current Technical Specification 4.8.1.1.29 7), concerning the periodic testing of the diesel generators, calls for performing a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or longer test run to be followed by a "Hot Restart" within 5 minutes of the previous test.
The Hot Restart test is to be conducted in accordance with Specification 4.8.1.1.2.6)b).
The procedures for shutdown of the diesel generators involve 9
load reduction to 1000 kW for 3 minutes, unloading, generator breaker trip, idling until all cylinder exhaust temperatures are less than 400*F, and finally the engine trip.
It has been problematic to perform the Hot Restart test within 5 minutes after the diesel generator trip.
It has also been necessary to shutdown the diesel generator faster than recommended by the diesel generator shut down procedure in order to perform the Hot Restart test within 5 minutes of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> tcst run. Another potentially severe problem with performing these tests in quick succession is their potential for causing the critical path complicaticns and delays during an outage. ESF actuation testing is performed at the beginning of refueling outages.
Block tagouts are delayed until completion of ESF testing. Due to the testing sequence currently dictated by Technical Specifications, a minimum e' 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of critical path time is spent each refueling cutage running the two diesel generators.
By revising the surveillance requirements as requested, the two 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> runs could be completed later in the outage or at some other convenient tire.
The principle Design Criteria for the diesel generators as described in IEEE Standard 387-1977 includes a requirement that the diesel generator be capable of a restart with an initial temperature equal to the continuous rating full load engine temperature (IEEE 387-1977, 5.1.2).
In actual practice the testing is done at equilibrium temperature which is defined as within +10*F of the normal operating temperature (IEEE 387-1977, 6.3.1.(1)).
The purpose of the Hot Restart test is to verify that the diesel generator does not have, in any way, impaired performance following operation at full load or equilibrium temperature.
Failure to Hot Restart or extended delay in restarting is typically only experienced with small diesel engines which upon being tripped undergo a temperature rise transient. This temperature rise transient is experienced in small diesel engines which have engine driven forced air cooling.
The large diesel generators at catawba are water cooled and do not experience any significant temperature rise transients during operation or after shutdown. The diesel generators are normally maintained at Hot Standby conditions. The normal standbytemperatureofdiesellubeoilandcoolingwateris[155'Fwhereasthe normaloperatingtemperatureforlubeoilandcoolingwateris[166-173'F.
According to IEEE 387-1977, Section 6.3.1.1, the equilibrium engine terperature
s o
DISCUSSION AND NO SIGNIFICANT MAZARDS CONSIDERATIONS (Continued) is defined as jacket water and lube oiltemperatures within +10'F of the normal operating temperatures at full load. The diesel units are maintained close to equilibrium temperatures even during standby conditions and consequently are not subject to unreliability traceable to internal temperature transients. Since the l
diesel generator equilibrium operating conditions are the same as the conditions following a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> full load run, the Hot Restart testing may be done following a separate diesel generator run af ter the diesel generator has attained equilibrium temperature.
It should be pointed out that starting the diesel generators from normal shutdown conditions and accepting the ESF loads would be a more demanding test.
The proposed amendments of the Technical Specifications would permit a separate 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test run and a Hot Restart with full ESF load acceptance test. The proposed Hot Restart testing is to be carried out under equilibrium operating conditions for the diesel generators and these do not differ from the conditions of current Hot Restart testing, therefore no adverse safety implications can be attributed to the preposed changes.
10 CFR 50.92 states that a preposed amendment involves no significant hazards considerations if operation in accordance with the proposed amendment would not:
(1)
Involve a significant increase in the probability or consequences of an accident previously evaluated; or I
(2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3)
Involve a significant reduction in a margin of safety.
The proposed change does not involvo a significant increase in the probability or consequences of any previously evaluated accident.
Separating the two testing requirerents will not result in the degradation or loss of function of the diesel generatcrs. The diesels will still be available to operate if called upon.
Equivalent testing requirements will be maintained.
The prepcsed change will not create the possibility of a new or different kind of accident from any accident previously evaluated.
The separation of the two tests will not change the design or the allowed operating modes of the nuclear plant.
The proposed change will not involve a significant reduction in a margin of safety. The diesel generators will be maintained with the same degree of reliability. Separation of the two tests will not result in any less testing but will allow greater flexibility to operation personnel as to when each test will be performed, j
For the reasons stated above, Duke power Company has determined that the proposed change does not involve Significant Hazards Considerations.
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