ML19350A063
| ML19350A063 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 11/20/1980 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-02, TASK-8-2, TASK-RR LAC-7242, NUDOCS 8012010310 | |
| Download: ML19350A063 (4) | |
Text
..
ts D DA/RYLAND.
h COOPEPAT/VE
- PO BOX 817
- 2615 EAST AV SOUTH. LA CROSSE. W1SCONS:N S4601 (608) 788 4000 November 20, 1980 In reply, please refer to LAC-7242 l
DOCKET NO. 50-409 Director of Nuclear Reactor Regulation ATTN:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Operating Reactors U. S. Nuclear Regulatory Ccx. mission Washington, D. C.
20555
SUBJECT:
DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR) l PROVISIONAL OPERATING LICENSE NO. DPR-45 SEP TOPIC VIII-2, ON-SITE EMERGENCY POWER SYSTEM -
DIESEL GENERATOR i
Reference:
(1)
NRC Letter, Crutchfield to Linder, dated August 20, 1980.
~2)
DPC Letter, LAC-7136, Linder to Crutchfield, l
dated September 12, 1980.
Gentlemen:
In response to the NRC staff evaluation (Reference 1), Dairyland Power Cooperative concurs with your assessment of our On-Site Emergency Power System.
Although our existing Diesel Generator Testing is acceptable, an Application for Amendment to License (Reference 2) has proposed alterations in our diesel generator testing program which will more closely conform to the current licensing criteria.
Enclosure (1) outlines the proposed changes as itemized in l
Section 2.3 of Reference l.
~
Very truly yours, l
DAIRYLAND POWER COOPERATIVE l
Frank Linder, General Manager FL:RMB:af cc:-
J. G.
Keppler, Reg. Dir., NRC-DRO III NRC Resident Inspectors 8012.0103/F
/
b LAC-7242 r
11/20/80 ENCLOSURE 1 Diesel Generator Testing Section 2.3, Eeference 1 NRC QUESTION:
(1)
Testing of diesel-generator units, at least once every 18 months, should:
(a)
Demor. strate proper startup operation by simulating loss of all ac voltage and demonstrate that the diesel generator unit can start automatically and attain-the required voltage and frequency uithin acceptable limits and time.
(c) ' Demonstrate full-load-carrying capability for an interval of not lees than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, of chich 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> should be at a load equivalcnt to the continuous rating of the diesel generator and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at a load equivalent to the 2-hour rating of the diesel generator.
Verify that voltage and frequency requirements are naintained.
The test should also verify that the cooling system functions uithin design limits.
(e)
Demonstrate functional capability at full-load temperature conditions by verunning the test phase outlined in (a) and (b), immediately follouing (c),
above.
(f)
Demonstrate the ability to synchronize the diesel generator unit vith offsite pouer chile the unit is connected to the emergency load, transfer this load to the offsite pover, isolate the diesel-generator unit, and restore it to standby status.
(g) ^ Demonstrate that the engine vill perform properly if suitching from one fuel-oil supply system to another is a part of the normal operating procedure to satisfy the 7-day storage requirement.
DPC RESPONSE:
(1) (a) _ Time limit was not originally specified in the Technical Specification dated-October 31, 1969.
The time limit was added in Amendment No. 6 dated August 2, 1976.
Section 4.8.1.1.2.a.4 of-the proposed Technical Specifications specifies a time of less than or equal to 10 seconds.
' t
LAC-7242 11/20/80 ENCLOSURE 1 - (Cont'd)
(1) (c)
An operating duration of 60 minutes.was previously specified.
The proposed Technical Specification 4.8.1.1.2.c.7 changes the minimum duration to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
(e)
The existing requirement did not provide for a restart at the completion of the 24-hour run.
The proposed Technical Specification 4.8.1.1.2.c.7 requires an automatic start within 5 minutes of completion of the 24-hour test.
(f)
The NRC response to the requirement of synchronizing the diesel generator unit with off-site power while the unit is connected to the emergency load was "not addressed".
The design of the LACBWR plant does not permit synchronizing with an energized bus since no synchronizing equipment exists.
The diesels, after they have reached required speed and voltage, pick up the associated dead bus. -Therefore, the requirement to test synchronization does not apply to LACBWR.
(g)
Section 4.8.1.1.2.c.9 of the proposed Technical Specifi-cations has added a requirement to verify the capability to transfer fuel oil from the storage tank to the diesel day tanks.
NRC QUESTION:
(2)
Testing of redundant diesel-generator unita during normal plant operation should be performed independently (non-concurrently) to minimize common failure modes resulting from undetected interdependences cmong diecel-generator unita.
Rouever, during reliability demonstration of diesel-generator unita during plant preoperational testing and testing subsequent to any plant modification uhere diccel-generator unit interdependence may have been affected or every 10 yeare (during a plant chutdoun), whichever is the charter, a test should be conducted in uhich redu,: dant units are started rimultaneoucly to help identify certain common failure modes undetected in eingle diesel-generator unit teste.
DPC RESPONSE:
(2)
This item was not originally addressed.
The proposed Technical Specifications section 4.8.1.1.2.d reauires-the reliability demonstration to be conducted every ten years or sooner if a modification is performed that may affect diesel interdependence. i
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LAC-7242 11/20/80 ENCLOSURE 1 - (Cont'3)-
NRC QUESTION:
(3)
Periodic testing of dieset-generator unita during normat plant operation'shoutd:
(a)
Demonstrate proper startup and verify that the
?
. required voltage and frequency are automaticatty attained uithin acceptable tinits and time.
This test should also verify that the components of the diecet-generator unit required for automatic startup are operabic.
DPC RESPONSE:
(3) (a)
The proposed Technical Specification, Section 4.3.1.1.3, lists the automatic start components and the required surveillance activities.
NRC CUESTION:
(4)
The intervat for periodic testing under (3), above (on a per'dieset-generator unit bacia) should be no nove than 31 daya and should' depend on demonstrated performance.
If more than one failure has occurred in the tact 100 testa (on a per nuatear unit basis), the test intervat should be chartened in accordance with the feitauing schedute:
F (a)
If the number of failurce in the laat 100 valid teste is one or zero, the test intervat should be not more than 31 days.
(b)
If the number of failures in the last 100 valid testa is tuo, the test interval should be not more than 14 days.
DPC RESPONSE:
(4)
Table 4.8.1.12-1 of the proposed Technical Specifications adds the progressive test frequencies based on the number of-diesel start failures as required by Regulatory Guide 1.108. /
l l
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