ML20098H031
| ML20098H031 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 09/28/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| GL-84-15, TAC-59263, TAC-59264, NUDOCS 8410090277 | |
| Download: ML20098H031 (10) | |
Text
_ _ _ _ _ _ _ _ - _.
'c DcxE POWEn GOMPANY P.O. ISOK 33889 CHANIAFTTE. M.C. 28942 HAL H. TUCKER nu p,,og
,"' """{
(704) 07a-4run September 28, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555 Atteneion:(M5[5.II.T M idii Licensing Branch No. ' 4"
Subject:
McGuire Nuclear Station Docket Nos. 50-369, 50-370 Diesel Generator Reliability Generic Letter 84-15
Dear Mr. Denton:
Please find attached Duke Power Company's response to Generic Letter 84-15.
This generic letter concerns diesel generator reliability.
I declare under penalty of perjury that the statements set forth herein are true and correct to the best of my knowlege.
Very truly yours, b
e Hal B. Tucker WHM/mjf Attachment cc: Mr. James P. O'Reilly,' Regional Administrator U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 i-Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station 8410090277 g40928 pDRADOCK0S000369 PDR O
\\ \\
9 DUKE POWER COMPANY MCGUIRE NUCLEAR STATION Response to Generic Letter 84-15 Diesel Generator Reliability Diesel Generator Cold Fast Start Surveillance Tests The diesel generators at McGuire are not subjected to fast cold starts because of design fe'atures of the Diesel Generator Engine Cooling Water System which circu-lates warm water through the Diesel Generator whenever the Diesel Generator is not running, and the Diesel Generator Engine Lubrication Oil System which keeps the oil warm and lubricates the main bearings and rocker arms during non-operating conditions. There have been no fast cold starts in the past year, and because of redundancy of systems none are expected in the future.
Diesel Generator Reliability Data Current reliability data for McGuire Nuclear Station is as follows (beginning with issuance of an operating license, and continuing through 9-17-84):
DIESEL VALID VALID GENERATOR TESTS FAILURES 1A 70 2
1B 64 1
2A 23 2
2B 27 2
In the last 20 tests on each diesel generator, there has been one failure on diesel generator 1A, zero on 1B, one on 2A, and two on 2B.
A logbook of the operation of each diesel generator is kept in the Control Room.
It includes a record of each start, a determination of whether it is valid or invalid, and other related information such as the reason for the start, time and date. No yearly data report is generated, however the logbooks are maintained and contain all previous test and failure data.
Diesel Generator Reliability Program McGuire Nuclear Station has an effective diesel generator reliability program.
On March 3,1983 INPO issued SOER 83-1 concerning diesel generator reliability.
As a result of McGuire's review of SOER 83-1, it was determined that McGuire's program aircady complied with all of the recommendations made by INPO. The effectiveness of the reliability program is enhanced by performing preventive maintenance in accordance with the manufacturers recommendations, including engine lubrication oil analyses, checks for loose parts and excessive vibrations, and maintenance of control and protection systems which could prevent proper diesel generator operation. Testing is done as required by McGuire Technical Specification 4.8.1.1.2 (Attachment 1) or for troubleshooting purposes. Technical Specification. Table 4.8-1 (Attachment 2) is a dicual generator test schedule which supports the reliability goal. The diesel generators are not subjected to cold fast starts as described previously.
Personnel are trained on diesel generator operation, construction and auxiliary system interaction. Only those qualified can perform the tests and record
-pertinent data. The INPO Design recommendations were all considered and incorporated into the design decisions for the McGuire diesel generators. Based on all of the recommendations made by INPO, McGuire has in place an effective program to monitor diesel generator reliability.
' Based on the review of the logbooks kept on each diesel generator, seven valid diesel generator failures have occurred out of 184 valid tests.
Some of these failures have been due to loose part damage, valve leakage, and voltage regulator transformer failure. Since the diesel generators have not been tested extensively and failures have been infrequent, data is not sufficient to determine failure frequencies or failure causes.
7,
.-Attachment 1
. ELECTRICAL POWER SYSTEMS ACTION:<(Continued) i
+
2.
When in MODE 1, 2, or 3 with a steam pr' essure greater than 900 psig, the steam-driven auxiliary.feedwater pump is OPERABLE.
If these conditions are not satisfied within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> be in at least NOT STAN08Y within the next 6 b ars and in COLD SHUTDOWN wi
'following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
d.
. With two of the above required offsite A.C. circuits inoperable, demonstrate the OPERASILITY of two diesel generators by performing Specification 4.8.1.1.2a.4) 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, unless~the diesel generators operating; restore at.least one of the inoperable,are already 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 STAN08Y w the'next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. With only one offsite source restored, restore at
-least two offsite circuits 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
~
time of initial loss or be in at least HOT STAND 8Y 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 />.
With two of the above required diesel generators inoperable, e.
demonstrate the OPERA 8ILITY of two offsite A.C. circuits by performing Specification 4.8.1.1.la, 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; 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 at least HOT STAN08Y 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 at least two diesel generators to OPERA 8LE 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
. least HOT STAN08Y 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 SHulDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS -4.8.1.1.1 Each of the above required independent circuits between the offsite transmission network and the ensite Essential Auxiliary Power System shall be:
Determined OPERA 8LE at least once per 7 days by verifying correct
- a. -
breaker alignments, indicated power availability, and b.
Demonstrated OPERABLE at least once per 18 months during shutdown by transferring (manually and automatically) unit power supply from the normal circuit to tho alternate circuit.
g 4.8.1.1.2 -Each diesel generator shall be defronstrated OPERABLE:
In accordance with the frequency specified in Table 4.8-1 on a a.
STAGGERED TEST BASIS, by:
1)
Verifying the fuel level in the day tank, McGUIRE - L' NITS 1 and 2 3/4 8-2 L
{
i ELECTRICAL POWER SYSTEMS
)
SURVEILLANCE' REQUIREMENTS (Continued) 2)
Verifying the fuel level in the fuel storage tank, 3)
Verifying the fuel transfer pump starts and transfers fuel from the storage system to the day tank, 4)
Verifying the diesel starts from ambient condition and accelerates to at least 488 rpm in. less than or equal to 11 seconds. The generator voltage and frequency shall be at least 4160 volts and 57 Hz within 11 seconds after the start signal. The diesel generator shall be started for this test by using one of the following signals:
a)
Manual, or
,b)
Simulated loss-of-offsite power by itself, or c)
Simulated loss-of offsite power in conjunction with an ESF Actuation test signal, or d)
An ESF Actuation test signal by itself.
5)
Verifying the generator is synchronized, loaded to greater than or equal to 3000 kW in less than or equal to 60 seconds, and to 4000 kW within 10 minutes and operates for at least 60 minutes, and 6)
Verifying the diesel generator is aligned to provide standby power to the associated emergency busses.
b.
By removing accumulated water:
1)
From the day tank at least once per 31 days and after each occasion when the diesel is operated fo.r greater than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, and 2)
From the storage tank at least once per 31 days, By sampling r.ew fuel oil in accordance wit ASTM 04057-81 prior to c.
addition to the storage tanks and:.
1)
By verifying in accordance with the tests specified in ASTM 0975-81 prior to addition to the storage tanks that the sample has:
a)
An API Gravity of within 0.3 degrees at 60*F or a specific gravity of within 0.0016 at 60/60*F, when compared to the suppiter's certificate or an absolute specific gravity at 60/60*F of greater than or equal to 0.63 but less than or equal to 0.89 or an API gravity at 60*F of greater than or equal to 27 degrees but less than or equal to 39 degrees.
McGUIRE - UNITS 1 and 2 3/4 8-3 Amendment No.14 (Unit 2)
Amendment No. 33 (Unit 1) l
ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) b)
A kinematic vicosity at 40"C of greater than or equal to 1.9 centistokes, but less than or equal to 4.1 centistokes, if gravity was not determined by comparison with the supplier's certification.
c)
A flash point equal to or greater than 125*F, and d)
A clear and bright appearance with proper color when tested in accordance with ASTM 04176-82.
2)
By verifying within 31 days of obtaining the sample that the other properties specified in Table 1 of ASTM 0975-81 are met when tested in accordanca with ASTM 0975-81 except that the analysis for sulfur may be performed in accordance with ASTM D1552-79 or ASTM D2622-82.
d.
At least once every 31 days by obtaining a sample of fuel oil from the storage tanks in accordance with ASTM 02276-78, and verifying that total particulate contamination is less than 10 mg/ liter when checked in accordance with ASTM D2276-78, Method A.
At least once per 18 months, during shutdown, by:
e.
1)
Subjecting the diesel to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service; 2)
Verifying the generator capability to reject a load of greater than or equal to 576 kW while maintaining voltage at 41601 420 volts and frequency at 60 1 1.2 Hz; 3)
Verifying the generator capability to reject a load of 4000 kW without tripping. The generator voltage shall not exceed 4784 volts during and following the load rejection; 4)
Simulating a loss-of-offsite power by itself, and:
a)
Verifying deenergization of the emergency busses and load shedding from the emergency busses, and b)
V9rifying the diesel starts on the auto-start signal, energizes the emergency busses with permanently connected loads within 11 seconds, energizes the auto connected blackout loads through the load sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the blackout loads. After energization, the steady-state voltage and frequency of the emergency busses shall be maintained at 4160 1 420 volts and 60 1 1.2 Hz during this test.
McGUIRE - UNITS 1 and 2 3/4 8-4 Amendment No.14 (Unit 2)
Amendment No. 33 (Unit 1)
t
?
ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) i-5)
Verifying that on an ESF actuation test signal, without loss-of-offsite power, the diesel generator s' tarts on the auto-start signal and operates on standby for greater than or equal to 5 minutes.
The generator voltage and frequency shall be at least 4160 volts and 57 Hz within 11 seconds after the auto-start signal; the steady-state generator voltage and frequency shall be maintained within 4160 2 420 volts and 60 t 1.2 Hz during this test; 6)
Verifying that on a simulated loss of the diesel generator, with offsite power not available, the loads are shed from the emergency busses and that subsequent loading of the diesel generator is in accordance with design requirements; 7)' Simulating a loss-of-offsite power in conjunction with an ESF actuation test signal, and a)
Verifying deenergization of the emergency busses and load shedding from the emergency busses; s 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, lube oli pressure, and generator differential, are automatically bypassed upon loss of voltage on the emergency bus concurrent with a Safety Injection Actuation signal.
8)
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 greater than or equal to 4400 kW and during 1
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 greater than or equal to 4000 kW.
The generator voltage and frequency shall be at least 4160 volts and 57 Hz within 11 seconds after the start signal. The steady-state generator voltage and frequency shall be maintained within 4160 t 420 volts and 60 1.2 Hz during this test. Within 5 minutes after completing this 24-hour test, perform Speciff-cation 4.8.1.1.2d.7)b);
McGUIRE - UNITS 1 and 2 3/4 8-5
I ELECTRICAL POWER SYSTEMS
. SURVEILLANCE REQUIREMENTS (Continued) 9)
Verifying that the auto-connected loads to each diesel generator do not exceed the 2-hour rating of 4400 kW;
- 10) 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, i
i b)
Transfer its loads to the offsite power source, and c) 8e restored to its standby status.
- 11) Verifying that with the diesel generator operating in a test mode, connected to its bus, a simulated Safety Injection signal e
overrides the test mode by:
(1) returning.the diesel generator to standby operation, and (2) automatically energizing the emergency loads with offsite power;
- 12) Verifying that the fuel transfer pump transfers fuel from each fuel storage tank to the day tank of each diesel via the installed cross-connection lines; i
- 13) Verifying that the automatic load sequence timer is OPERABLE with the interval between each load block are within the tolerances shown in Table 4.8-2; i
- 14) Verifying that the following diesel generator lockout features i
prevent diesel generator starting only when required:
a)-
Turning gear engaged, and b)
Emergency stop.
- 15) Verifying that with all diesel generator air start receivers pressurized to less than or equal to 220 psig and the compres-sors secured, the diesel generator starts at least 2 times from ambient conditions and accelerates to at least 488 rpm in less 4
than or equal to 11 seconds.
i' f.
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 i
diesel generators accelerate to at least 488 rpm in less than or equal to 11 seconds; and g.
At least once per 10 years by:
8 McGUIRE - UNITS 1 and 2 3/4 8-6 Amendment No.14 (Unit 2)
Amendment No. 33 (Unit 1)
.m
=
1 ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 1)
Draining each fuel. oil storage tank, removing the accumulated sediment and cleaning the tank using a sodium hypochlorite solution, and 2)
Performing a pressure test of those portions of the diesel fuel oil system designed to Section III, subsection ND of the ASME Code at a test pressure equal to 110% of the system design pressure.
\\
^
x n
n-n n
n n
,~
G h 8[1.l M Rep)rti - Af1-dfesel lenn ator\\ ailfare D alid'or non-vali d shal'1 N f
be reported to the Commission pursuant to Specification 6.9.1.
Reports of diesel generator failures shall include the information recommended in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977.
If the number of failures in the last 100 valid tests (on a per nuclear unit basis).is greater than or equal to 7, the report shall be supplemented to ir,clude the additional information recommended in Regulatory Position C.3.b of Regu}atoryGuide1.108, Revision 1, August 1977.
4.8.1.1.4 Diesel Generator Batteries - Each diesel generator 125-volt battery-bank and charger-shall be demonstrated OPERABLE:
a.
At least'once per 7. days by verifying that:
f
. 1)
The electrolyte level of each battery is above the plates, and 2)
-The overall battery voltage is greater than or equal to 125 volts under a float charge, b.
At least 'once per 18 months by verifying that:
.1).The batteries, cell plates and battery racks show no visual indication of physical damage or abnormal deterioration; 2)-
The battery-to-battery and-terminal connections are clear, tight, free of corrosion and coated with anti-corrosion material; and 3). The battery capacity is adequate to supply and maintain in OPERABLE status its emergency loads when subjected to a battery.
service test.
i t
McGUIRE - UNITS 1 and 2 3/4 8-7
.-w 4
-p.-
c -
-~r+-+--,--e,
-.-w.-.,,-y
,-..e,r-,,--
+,-,'w-gw-e,.
,,re--,wy,w,-m,~,,.r--,---everyw
- g. m.e v - t r w ww, w w ww m mwy-*,egve,evv y w e*e-
5, TABLE 4.8-1
_ DIESEL GENERATOR TEST SCHEDULE
,3'.
NUMBER OF FAILURES IN-i LAST 100 VALID TESTS
- TEST FREQUENCY fI At least once per 31 days
<2 At least onct 7er 14 days 3
At least oncs a 7 days
> 4 At least once per 3 days
&w
- )
s.
1 4
a
" Criteria f or determining number of failures and number of valid -
- tests shall be in accordance with Regulatory Position C.2.e of lt Regulatory Guide 1.108, Revision i' August 1977, where the last
.100 tests are determined on a per nuclear unit basis.
p For the-
. urposes of this ' test schedule, only valid tests conducted after-N the OL issuance date shall be included in the computation of the-
"last 100 valid tests." Entry into this test schedule shall be
-made at the 31 day test frequency.
[
J j
s
[
McGUIRE.' UNITS l1 and 2
' 3/4 8-8 1
w e
e n
4
,,ee-m-
---ec.,
--.e
, we,we
-m--,,,.,,v-,-
ev.-en.,--o-.e
-ee.-,.,--,w<e w e, - y
,,e,~~p mm-,-r-
-