ML20039B698
| ML20039B698 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/15/1981 |
| From: | Baxter F YANKEE ATOMIC ELECTRIC CO. |
| To: | Padovan M NRC |
| References | |
| EEG-OTG-38-81, NUDOCS 8112230436 | |
| Download: ML20039B698 (3) | |
Text
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YANKEE AT0DIC ELECTRIC COMPANY F*
- L 1671 Worcester Road, Framingham, Massachusetts 01701
. YANKEE
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Mr. Mark Padovan
$;j United States Nuclear Regulatory Commission
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Mail Stop - Phillips 416 Washington, D.C.
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Dear Mr. Padovan:
We have been requested through LlS to provide you with comments on your proposed " Technical Specifications for Class lE 120 V AC Vital Instrument Buses."
Our comments are noted below:
GENERAL:
1.
The Technical Specifications do not recognize a four battery system which may be used to power the four Vital Buses, or the use of bus-ties between batteries within a redundant system.
2.
Section - Action (a)
Assuming that all vital buses are energized from their associated invertors, the licensee should have the flexibility to take one bus out of service without going into a limiting condition.
This, of course, assumes that the protective channel corresponding to the deenergized bus will be put into the trip position (on a 2 out of 4 logic the resultant will be operation on a 2 out of 3 which is acceptable).
We are attaching typical Tech Specs from one of our plants reflecting the above situation.
3.
Section 3.8.3.1 g,h and Ac tion (~C): Re ference to the de requirements in this section of the Tech Specs should be deleted; there is a separate section dealing with these requirements.
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Mark Padovan December 15, 1981 Page 2 4.
Section 3.8.3.1 a through h: RG 1.93 is structured around the nonavailability of power sources, whereas these tech specs are based on the nonavailability/ availability of busses.
5.
Section.
Ba ses :
The allowable out-of-service times bear no resemblance to those in RG 1.93.
We hope we have been able to convey our thoughts to you; however, should you have any questions, do not hesticate to call.
We would appreciate receiving subsequent draf ts of these technical specifications for comments and review.
Sincerely, curu F. D. Baxter, Manager Electrical Engineering Group FB:jko
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D ELECTRICAL PO!.*ER SYSTEMS AC DISTRIBUTION - OPERATING LIMITING-CONDITION FOR OPERATION L3.8.2.1 The following ac electrical buses and panels shall be OPERABLE and energized:
4160 volt ac Emergency Bus ES 4160 volt ac Emergency Bus E6 480 volt ac Emergency Bus E51 480 volt ac Emergency Bus E52
-480 volt ac Emergency Bus E61 480 volt ac Emergency Bus E62 480 volt ac EmergnecyLBus E64 120 volt ac Vital Panel IE (energized via UPS I-lE) 120 volt ac Vital Panel IF (energized via UPS I-IF)
Three of the four following ac Vital Panels shall be operable and energized:
120 volt ae Vital Panel IA (energized via.UPS I-1A) 120 volt ac Vital Panel IB (energized via UPS I-1B) h"* M S * *t'*"y 120 volt ac Vital Panel IC (energized via UPS I-lC) 4A b"*'5
.120 volt ac Vital Panel ID (energized via UPS I-ID) 4kc_ t"t*5ek IS -
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.s (esc 4xw4L-APPLIC BILITY: MODES 1, 2, 3 and 4.
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ACTION:
With less than the above complement of ac buses and panels OPERABLE, restore the inoperable bus or panel to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-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 />.
SURVEILLANCE REQUIREMENTS f
-4.8.2.1 At least once per 7 days the spec!fied ac buses and panels shall be determined OPERABLE and energized by verifying correct breaker alignment and indicated power' availability.
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