ML20244D499

Requests for Addl Info Re Util Electrical Sys,Instrument Air Sys & Actuation Signals for ESF in Support of 670601 Amend 2 Application for Provisional OL for Util

ML20244D499
Person / Time
Site:	Nine Mile Point
Issue date:	07/31/1968
From:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
To:	Pratt M NIAGARA MOHAWK POWER CORP.
Shared Package
ML17055E652	List: IA-89-101, Informs of Completion of Review of Application by Niagara Mohawk Power Corp for Conversion of Util Provisional OL to full-term OL During ACRS 740905-07 Meeting.Concurs in Subj License Conversion IA-89-114, Confirms 740624 Meeting Re Author Review of Util SER & Concurrence Subj to Revs Discussed ML20244C683 ML20244C712 ML20244C715 ML20244C728 ML20244C740 ML20244C768 ML20244C776 ML20244C791 ML20244C807 ML20244C810 ML20244C813 ML20244C816 ML20244C818 ML20244C821 ML20244C825 ML20244C827 ML20244D471 ML20244D475 ML20244D485 ML20244D499 ML20244D512 ML20244D553 ML20244D969 ML20244D979 ML20244D984 ML20244D995 ML20244E011 ML20244E026 ML20244E032 ML20244E123 ML20244E128 ML20244E141 ML20244E163 ML20244E184 ML20244E223 ML20244E231 ML20244E248 ML20244E270 ML20244E353 NUREG-1125, Final Response to FOIA Request for Documents.Forwards App a Documents.App a Documents Also Available in Pdr.Acrs Rept Subj to Request Published in NUREG-1125,Vol 2, Compilation of ACRS Repts
References
FOIA-89-101, FOIA-89-114 NUDOCS 8904210369
Download: ML20244D499 (3)

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WASHINGTON D.C. 20545 RECElvED .W ' ,

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> g4 Docket No. 50-220 Y1 3 19 2 U' 8 AM 1157

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'V M ATONC DEZY COMM.

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..'cha rs Niagara Mohawk Power Corporation 300 Erie Boulevard West -

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Attention: Mr. Minot H. Pratt t ..; ---- i Vice' President and . t. -

Executive Engineer ,

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Gentlemen:  ::'.a:'n.:.l f f ~

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This refers to A=endment 2, dated June 1, 1967, to your applica-tion for a provisional operating license for the Nine Mile Point Nuclear Station located in the town of Scriba, New York.

O Our review of Amendment 2 indicates that additional information g on the facility electrical systen, instrument air syste=s and l the actuation signals for the engineered safety features is  !

necessary to enable us to continua our review of these matters. f A list of specific comments illustrating the kind of information

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needed is enclosed.

We will be available to discuss and clarify any of the specific Co ents.

Sincerely yours, h 1

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Peter A. Morris, Director Division of Reactor Licensing

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Enclosure:

List of Comments ,

c.c: Arvin E. Upton, Esquire LeBoeuf, Lamb,Teiby & Mac.-e 3

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l ADDITIONAL INFORMATION REOUIRED 1 > ,

.; NIAGARA MOHAWK POWER CORPORATION 8'

NINE MILE POINT PLANT l I. DOCKET NO. 50-220 l

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1. Evaluate the ability of the offsite power system to provide power for 1

engineered safety feature and safe shutdown loads with a fault in the outside system. This discussion should include (1) loss of one or more 345 KV transmission lines, (2) sudden loss of the NMP generating capacity, and (3) sudden loss of the largest generating plant in the Niagara Mohawk grid.

, 2. Evaluate the ability of the offsite power design to satisfy Criterion 39 in view of the two-minute time delay required before the 115 KV 4

disconnect switch can be opened following a fault on one half of the 115 KV system.

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'f' 3. "he FSAR does not discuss the use of d.c. power for circuit breaker operation in the switchyard. Describe how d.c. power is supplied to a j ( the switchyard and evaluate the ability of the switchyard to operate properly with a single failure in the d.c. system.

.-l i 4. A recent electrical fire in a nuclear power station has emphasized the importance of the design of electrical penetrations and cable runs.

g Dascribe and evaluate the designs being utilized for the cable runs

- and electrical penetrations in the Kine Mile Point Station. This dis-

'} j cussion should include, but not be limited to, the types of cables being

. used, the design and spacing of cable trays and electrical penetrations, j derating, and circuit overload protection.

h 5. Describe and evaluate the consequences of co=plete loss of station air and/or vital instrument air. This discussion should include, but not

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be limited to, the failure modes of pneumatic instruments and valves 1- 4 .

under the following conditions:

a l 1. Post-shutdown from full power operation.

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! i 2. Post accident.

l l t 1 6. The diesel generators are started upon loss of voltage at the essential j buses. Evaluate the need for starting the diesel generators on signals I other than loss of voltage (e.g. , coolant injection).

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( 7. Describe and evaluate the ad. .cy of the core spray actuation signals .

The Icek discussed.of diverse signals for isolation valve actuation should be i

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