ML19351D880
| ML19351D880 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/06/1980 |
| From: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| To: | Crutchfeild D Office of Nuclear Reactor Regulation |
| References | |
| TASK-06-07.B, TASK-06-07.C, TASK-06-10, TASK-07-03, TASK-08-02, TASK-08-03, TASK-6-10, TASK-6-7.B, TASK-6-7.C, TASK-7-3, TASK-8-2, TASK-8-3, TASK-RR WYR-80-123, NUDOCS 8011200329 | |
| Download: ML19351D880 (4) | |
Text
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l Telephone 617 366-9011 I-.;Us0 D'STR13*JIICH m
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YANKEE ATOMIC ELECTRIC COyPANY B.3.2.1 Q1) NOV Zi>
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WYR 80-123 QL em 20 Turnpike Road Westborough, Massachusetts 01581
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w ra rJf November 6, 1980 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing Re ferences :
(a) License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter dated September 16, 1980
Subject:
Request for Additional Information on SEP Topics
Dear Sir:
provides the additional information requested in Reference (b).
We trust this information is satisfactory; however, if you have any questions, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY J. A. Kay Senior Engineer - Licensing JAX/ncj Attachment 8011200 N $
1
REQUEST FOR ADDITIONAL INFORMATION ON SEP TOPICS VI-7.B, VI-7.C, VI-10, VII-3, VIII-2 AND VIII-3 Discussion:
Yankee Rowe does not use inverters; however, Yankee Rowe does utilize a de powered motor generator set to supply its 120 V Vital AC Buc; therefore, our answers pertain to this motor generator set.
Question 1.
Quantify the number of instrument inverters in your plant and for each inverter:
a) identify the inverter and its power supplies; and b) describe the switching features that are provided to switch inverter power supplies and inverter loads (including synchronization circuits).
Answer:
la & b.
There is one 120 V Vital AC Bus at Yankee Rowe.
The motor generator set supplies the Vital Bus and is powered from Battery Bus Number 1.
The Vital Bus can also be supplied from 480 V MCC 1 Bus 2 by operating a control switch in the control room.
In addition, each Vital Bus load can be individually switched in the switchgear room to an alternate 120 V ac bus (Transformer B Bus) supplied from a 480 V Emergency MCC. These transfer capabilities are shown in Figure 1.
Question:
2.
Provide the requirements for:
a) testing the transfer path's described in your response to 1 above, and b) limiting the number of redundant load groups that may be placed on any maintenance power source during each operating condition.
Answer:
2a.
Vital Bus loads are transferred from the motor-generator set to 460 volt MCC 1 Bus 2 and 480 volt Emergency MCC 1 once every 18 months to insure that these transfer capabilities are operable.
This is required by Technical Specification 4.8.2.1 3
2b.
This question is not applicable to the Vital Bus arrangement at Yankee Rowe since the 120 V Vital AC Bus does not have a redundant counterpart.
Question:
3 Describe the consequences of one er more load groups on a single de source losing power (e.g. automatic initiation of ECCS, automatic initiation of transfer from ECCS injection made to reci. ulation mode, loss of indication in the control room, loss of annuncias irs, loss of plant communications, loss of emergency telephones).
l Answer:
l 3
Loss of power to the 120 V Vital AC Bus will cause a reactor scram.
Furthermore, if the Vital Bus becomes inoperable, Technical Specification l
3 8.2.1 requires that the plant be in at least hot standby within one hour and in cold shutdown within the following thirty hours.
Alternate power sources as previously described would then be employed to re-energize Vital Bus loads.
If a prolonged Vital Bus failure is experienced, alternate i
instrumentation powered from other sources is available to monitor I
critical plant parameters.
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