ML17254A970
| ML17254A970 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 09/28/1984 |
| From: | Kober R ROCHESTER GAS & ELECTRIC CORP. |
| To: | Paulson W Office of Nuclear Reactor Regulation |
| References | |
| GL-84-15, NUDOCS 8410100527 | |
| Download: ML17254A970 (14) | |
Text
REGULATORYiPORMATION DISTRIBUTION SYFM (RIBS)
ACCESSIOA==NBR:8410100527 DOC,DATE: 84/09/28 NOTARIZED: YES, DOCKET ¹ FACIL:50-244 Robert Emmet Ginna Nuclear Planti Unit ii Rochester G
05000244 AUTH BYNAME AUTHOR AFFILIATION KOBERgR able Rochester Gas L Electric Corp'ECIP
~ NAME RECIPIENT AFFILIATION PAULSONzN ~ AG Operating Reactors Branch 5
SUBJECT:
Responds to Generic Ltr 84"15 "Proposed Shaft Actions to.
Improve L Maintain Diesel Generator Reliability," No action required to reduce number of cold fast start L
urveillance tests, Tech Spec changes not required, 0
DISTRIBUTION CODE:
A056D COPIES RECEIVED:LTRf ENCL SIZE:
TITLE; OR Submittal:Fast Cold Starts of Diesel Generators GL"83 41 NOTES:NRR/DL/SEP icy, OL: 09/19/69 05000244 REC IP IENT ID CODE/NAME>>
NRR ORBS BC 01 RGN1 INTERNAL; ADM/LFMB IE/DEPER/EAB 08 SB 10 04 06 COPIES LTTR ENCL'EC IP IENT ID CODE/NAME AEOD 07 NRR/DL/GRAB 09 NRR/DST/SPEB 11 RES/DRA/RRB 12 COPIES LTTR ENCL EXTERNAL; ACRS NRC PDR NTIS NOTES:
13 02 LPDR NSIC 03 05 0
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 23 ENCL
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ZP ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. 14649-0001 ROGER W. KOBER VICE PRESIDENT ELECTRIC &STEAM PRODUCTION TEI KPNONC ARCA CODE Tld 546.2700 September 28, 1984 Director of Nuclear Reactor Regulations ATT:
Mr. Walter A. Paulson, Acting Chief Operating Reactor Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
28555
Subject:
Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability (Generic Letter 84-15)
R.
E. Ginna Nuclear Power Plant Docket No.58-244
Dear Sir:
In accordance with Generic Letter 84-15 the following response is hereby submitted.
Item 1
Reduction in number of cold fast start surveillance tests for diesel enerators These emergency standby engine generator sets are equipped with necessary controls to automatically start the engine on failure of the normal power source and bring the engine to generator operating
- speed, ready to assume load.
The engine is equipped with jacket water and lube oil heating devices to maintain oil and water temperatures at level to permit immediate assumption of load.
A motor-driven lube oil circulating pump runs continuously until the engine is started, so that engine bearings are always lubricated and ready for operation.
- Thus, the Alco Diesel Generator units at R E. Ginna Nuclear Power Plant do not undergo cold fast starts.
As such, no action is required to reduce the number of cold fast starts and no Technical Specification changes are required.
Additionally, Ginna's Technical Specifications do not require testing diesel generators while emergency core cooling equipment is inoperable.
- Thus, no Technical Specification changes are required to address this item.
8410100527 840'F28 PDR
'ADDCK 05000244' PDR
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Itpm 2 Diesel Gen ator Reliabilit Data 2a)
Diesel Generator lA 1)
Last 28 starts:
a.
No Diesel Engine/Generator failure 2)
Last 188 starts:
a ~
4-'3-82 During Periodic Test at end of Annual Diesel Generator maintenance, (performed during annual Maintenance and Refueling Outage) one cylinder exhibited high exhaust temperature.
The cause was a weeping injector nozzle, which was then replaced.
b ~
1-18-88 LER 88-881 Governor at, wrong setting 2b)
Diesel Generator lB 1)
Last 28 starts:
a
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5-7-83 after completion of test, the diesel engine failed to shutdown due to the governor solenoid valve coil falling off armature due to the coil nut vibrating loose.
The coil and nut were reinstalled, Locktited, and nut was prick-punched to stud.
The Diesel Generator
- however, did operate satisfactorily during the test.
2)
Last 188 starts:
1-5-81 Cooling water line leak.
Bushing was replaced.
b.
6-17-81 Could not load unit to required KW.
Problem was governor adjustment.
c ~
9-18-88 Bus 16 breaker failed to close.
Cause was a binding control relay guide pin.
Relay was replaced.
'd ~
9-13-79 Bus 16 breaker failed to close, cause was apparently a
bad connection on lockout relay.
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8-16-78 Bus 16 breaker failed to trip.
Problem was bad connection at control power fuse block stabs.
9-14-77 Bus 16 breaker failed to close.
Problem was a bent "finger" on a secondary contact.
Ginna does not maintain a record which itemizes the demands and failures experienced by each diesel generator unit in the manner outlined in Regulatory Guide 1.188 position C.3.a.
A yearly data report is not maintained for each diesel generator's reliability.
Item 3
Diesel Generator Reliabilit 3a)
Ginna Station has a regular preventative maintenance schedule for its diesel generators, including an inspection of each unit, annually, utilizing the services of the diesel engine manufacturer.
These two Diesel Generator units are specifically designed for use in emergency standby generator service.
The total running hours from initial start in 1969 to 8/14/84 is 782 for the A D/G and 891 for the B D/G.
As such, the diesel generators are one of the most. frequently maintained'ieces of equipment relative to total operating time at Ginna.
The proper valve/breaker alignment of the di e s e 1 generator units is verified twice each
- month, once, prior to the monthly Periodic Test and then 15 days later.
In addition to the monthly periodic test the Diesel Generators are loaded in accordance with safeguard system testing on a refueling interval.
Standby diesel generator units have a particular problem in that a comparably large fuel supply is
- required, but little is used during the exercising of the engines.
Allfuel oil tends to degrade during extended storage.
The degradation, in general, is of two types.
The first is oxidation and polymerization resulting in the formation of soluble and insoluble gums.
The second is bacteria growth and the interface of the fuel and water in the storage tank.
This bacterial growth will result in fuel filter plugging, and has been known to cause fuel injection sticking.
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The most satisfactory method for insuring good fuel, at all times, is to replace the fuel periodic-ally.
Ginna Station pumps out all the old fuel, cleans the storage tanks and refills with fresh fuel on a annual basis.
3b)
In accordance with the Enclosure 3,
RGGE has reviewed the recommendations of NUREG/CR-8668 "Enhancement of On-Site Emergency Diesel Generator Reliability."
1)
Ginna Station has followed the manufacturer's recommendations as they apply to the Alco Diesel Generator units, with one exception.
Ginna Station performs Surveillance Testing on a
monthly basis (rather than bi-weekly) and during this testing, the Diesel Generators are operated for a minimum qf one hour at the continuous full load rating of 1958 KW (rather than 25-58% load).
Ginna Station operation of the Diesel Generators at the continuous fullload rating exceeds the manufacturer's recom-mendations noted on Page III-16of NUREG/CR-8668.
2)
Recommendation (b), page V-6, in NUREG/CR-8668 suggests "dust-tight steel cabinets having fully gasketed doors and other openings".
Ginna Station does not have dust-tight, cabinets having fully gasketed
- doors, however, Ginna Station has not had the problems associated with this recommendation.
3c)
An analysis of the performance specification (attachment to enclosure
- 3) with the existing Ginna Station surveillance testing program shows that Ginna Station's existing programs are adequate when compared with the proposed program.
1)
- However, some comments are necessary relevant to Item 3, Surveillance Test Frequencies.
It is suggested that all references in 3.b, which refer to "two failures in 28",
be modified to read "two identical failures in 28".
Two identical failures in 28 would be a
better indication of reliability degradation.
2)
Ginna Station's Technical Specifications are more stringent than Items 6
and 7.
This is clarified in the following excerpts from the Ginna Technical Specifications, Sections 3.7.1 and 3.7.2:
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3.7.1
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e reactor shall not be ma ntained critical without:
a
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The
- 34. 5 KV-4168 Volt station service transformer in service.
b ~
c ~
488-volt buses 14, 16, 17 and 18 energized.
4168-volt buses 12A and 12B energized.
d Two diesel generators operable with onsite supply of 18,888 gallons of fuel available.
3
~ 7 ~ 2 During reactor operation the requirements of 3.7.1 may be modified as follows:
a
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Power operation may continue withthe station service transformer out of service provided (a) the failure shall be reported to NRC within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> with an outline of the plans for prompt restoration of offsite power and the additional precautions to be taken while the transformer is out of service and (b) both diesel generators are operable.
Under conditions of fulfillment of (b) and nonfulfillment of (a), continued power operation shall not extend beyond 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Non-fulfillment of, (b) shall be deemed sufficient cause for immediate reactor shutdown.
b.
Power operation may continue if one diesel generator is out of service provided (a) the remaining diesel generator is run continuously, and (b) the station service transformer is in service and (c) such operation is not in excess of 7 days (total for both diesels) during any month.
3)
Comparison ofAppendix A, Typical Technical Speci-fications with Ginna Station's Technical Speci fications reveals that Ginna Station '
present Technical Specifications in general, are equal to and/or more restrictive than those proposed.
An example of this is Action (a) allows "72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />" to restore diesel generators to an operable
- status, whereas, Ginna Tech.
Specs.
only allow "24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />".
Also, Action (a) allows "6
hours" to go to "Hot Standby",
- whereas, Ginna Tech.
Specs.
require an immediate reactor shutdown.
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nna Station Technical Spec ications address the loss of the station service transformer, rather than the loss of a single off-site power supply, as addressed in the Typical Technical Specifications.
Xt should be noted at 4.8.1.1.2, that generator voltage of Ginna Station's Diesel Generators is 488 volts, not, 4168 volts.
R r W. Kober Subscribed and sworn to me this 28th da of eptember 1984 LYNN I. HAUCK NOTARY PUBLIC, State of N.Y., Monroe County My Commission Expires March 30, 19
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