ML17329A234
| ML17329A234 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 11/04/1991 |
| From: | Fitzpatrick E AMERICAN ELECTRIC POWER CO., INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-GTECI-048, REF-GTECI-049, REF-GTECI-NI, TASK-048, TASK-049, TASK-48, TASK-49, TASK-OR AEP:NRC:1161, GL-91-11, NUDOCS 9111120204 | |
| Download: ML17329A234 (5) | |
Text
ACCELERATED DISTRIBUTION DEMONS TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9111120204 DOC.DATE: 91/11/04 NOTARIZED: YES FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, Indiana M
50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Indiana M
AUTH.NAME AUTHOR AFFILIATION FITZPATRICK,E.
American Electric Power Co.,
Xnc.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000315 05000316
SUBJECT:
Responds to Generic Ltr 91-11, "Resolution of Generic Issues 48, 'Interlocks
& LCOs for Class 1E Vital Instrument Buses'
'49, 'Interlocks 6 LCOs for Class 1E Tie Breakers'."
DISTRIBUTION CODE:
A001D COPIES RECEIVED:LTR Q ENCL ~,SIZE:
TITLE: OR Submittal:
General Distribution NOTES:
D RECXPIENT ID CODE/NAME PD3-1 LA COLBURN,T.
XNTERNAL: NRR/DET/ECMB 7D NRR/DOEA/OTSBll NRR/DST/SELB 7E NRR/DST/SRXB 8E OCJ L~F-B.
. REG+FILE 0
EXTERNAL: NRC PDR COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD3-1 PD NRR/DET/ESGB NRR/DST 8E2 NRR/DST/SICB8H7 NUDOCS-ABSTRACT OGC/HDS2 RES/DSIR/EIB NSIC COPIES LTTR ENCL 1
1 D
D NOTE TO ALL"RIDS" RECIPIENTS:
D D
PLEASE HELP US TO REDUCE AVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED'TTR 18 ENCL ~ P
Indiana Michigan Power Company ~
P.O. Box 16631 Coiumbus, OH 43216 AEP:NRC:1161 Donald C.
Cook Nuclear Plant Units 1 and 2
Docket Nos.
DPR-58 and DPR-74 License Nos.
50-315 and 50-316
RESPONSE
TO NRC GENERIC LETTER 91-11, GENERIC ISSUES 48 AND 49 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C.
20555 Attn: T.
E. Murley November 4, 1991
Dear Dr. Murley:
This letter provides our response to NRC Generic Letter (GL) 91-11, Generic Issues 48, "LCOs for Class 1E Vital Instrument Buses,"
and 49, "Interlocks and LCOs for Class lE Tie Breakers."
The generic letter requests information regarding the time limitations and surveillance requirements for vital instrument buses, inverters, and tie breakers that can connect redundant Class 1E buses (AC or DC) at one unit or that can connect Class 1E buses between units at the same site.
The resolution to Generic Issues 48 and 49 states that plant procedures shall include time limitations and surveillance requirements for the 120V AC vital bus system and for tie breakers between redundant Class IE buses.
We have reviewed the Cook Nuclear Plant Technical Specifications and determined that the time limitations and surveillance requirements mentioned in the generic letter are addressed, as described below.
The Cook Nuclear Plant 120V AC vital bus system consists of four 120V AC distribution panels per unit known as control room instrumentation distribution (GRID) panels.
Each of these distribution panels is fed from a 7.5kVA inverter that is normally fed by the 250V DC system and is backed by a balance-of-plane regulating transformer known as the isolimiter.
Section 3.8.2.1 of the Technical Specifications for both units states that an eight-hour limiting condition for operation is in effect if any of the 120V AC vital buses are inoperable or deenergized (i.e.,
the buses must be returned to operable status within eight hours or the unit must be shutdown).
It is also noted in this section that these buses are considered operable only when fed from the battery-supplied inverter.
Further, Technical Specification 4.8.2.1 f
,9ilii20204 911104 P
,'PDR ADOCK 0500031=
PDR 00 i)g
Ih
Dr. T.
E. Murley AEP:NRC:1161 requires that the buses must be determined to be operable and energized by verifying proper alignment and indicated power availability at least once per 7 days.
Both units at Cook Nuclear Plant also have redundant train interconnections between the safety-related 600V buses (Bus A/Bus C
and Bus B/Bus D) and between the AB and CD batteries.
Technical Specification 3.8.2.1 states that the 600V buses must be operable and energized with the tie breakers open or an eight-hour limiting condition for operation is in effect.
Also, as required by Technical Specification 3.8.2.3, the 250V DC buses must be operable and energized with the tie breakers open or a two-hour limiting condition for operation is in effect.
Technical Specifications 4 '.2.1 and 4.8.2.3.1 provide weekly surveillance requirements that include verification that these tie breakers are open.
- Thus, as outlined above, the Cook Nuclear Plant Technical Specifications already include the time limitation and surveillance requirements noted in the generic letter, and the plant continues to operate in an electrical configuration consistent with the regulations and its design bases.
As requested in the generic letter, our response is being submitted undex'ath according to the pxovisions of Section 182a of the Atomic Energy Act 1954, as
- amended, and 10 CFR 50.54(f).
Sincerely, Vice President ldp cc:
D.
H. Williams, Jr.
A. A. Blind - Bridgman J.
R. Padgett G. Charnoff A. B. Davis
- Region III NRC Resident Inspector
- Bridgman NFEM Section Chief
~
~
COUNTY OF FRANKLIN Eugene E. Fitzpatrick, being duly sworn, deposes and says that he is the Vice President of licensee Indiana Michigan Power
- Company, that he has read the foregoing Response to NRC Generic Letter 91-11, Generic Issues 48, "LCOs for Class 1E Vital Instrument Buses,"
and 49, "Interlocks and LCOs for Class 1E Tie Breakers" and knows the contents thereof; and that said contents are true to the best of his knowledge and belief.
Subscribed and sworn to before me this ~g day of 199~.
NOTARY PUBLIC BITA D. HILL NOTNY PUBUC. STATE OF OHIO