ML17054C069

Forwards Updated Page & Drawings to Rept Included w/870407 Ltr Re Electrical Design of Facility Wye Pattern Globe Valves Presently Being Installed.W/Two Oversize Drawings

ML17054C069
Person / Time
Site:	Nine Mile Point
Issue date:	04/23/1987
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML17054C070	List: ML17054C069 ML17054C071 ML18038A697
References
NMP2L-1026, NUDOCS 8704300256
Download: ML17054C069 (8)

Text

RESUL~RY INFORMATION DISTRIBUTI+,SYBTER (RIDE) 8{'ACCESSION NBR 8704300256 DQC.,DATE.'7/0',/23 NOTARIZED: YES DOCKET ¹ FACIAL: 50-410 Nine Nile Point Nuclear Stationi Unit 2> Niagara Moha 05000410 AUTH. N4/E AUTHOR AFFILIATION MANGAN> C. V. Niagara Mohawk Power Corp.

REC IP. NANE RECIPIENT AFFILIATION Document.,Control Branch (Document Control Desk)

SUBJECT:

Forwards updated page 8c 4zaujpgs to rept re electrical design of facility wge pattern globe valves presently being instal led.

DISTRIBUTION CODE: A001D COPIES RECEIVEO: LTR ENCL SIZE:

TITLE: QR Submittal: General Distribution NOTES:

RECIPIENT COPIES RECIP lENT COP IES ID CODE/MANE LTTR ENCL ID CODE/MANE LTTR E'4'"L PD1-1 LA 1 0 PD1-1 PD 5 HAUGHEY,I1 1 NINERi S 1 INTERNAL: ACRS 6 6 ARM/DAF/LFNB 1 0 NRR/DEST/ADE 1 1 NRR/DEST/ADS 1 1 NRR/DOEA/TSB 1 1 NR HAS/ ILRB 1 1 QGC/HDS1 0 01;. 1 1 EXTERNAL EGiM BRUSKEi 8 1 1 LPDR NRC PDR 1 1 NSIC TOTAL NUNBER OF COPIEB REQUIRED: LTTR 25 ENCL 22

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Lm V'IAGARA H U MOHAWK NIAGARAMOHAWKPOWER CORPORATION/301 PLAINFIELDROAD, SYRACUSE, N.Y. 13212/TELEPHONE (315) 474-1511 April 23, 1987 NMP2L 1026 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Re: Nine Mile Point Unit 2 Docket No. 50-410 Gentlemen:

Enclosed are an updated page and drawings to the report that was provided as an enclosure to my April 7, 1987 letter regarding the electrical design of the Nine Mile Point Unit 2 wye pattern globe valves presently being installed. The updated page and changed drawings reflect the addition of ammeters to monitor main steam isolation valve pilot solenoid valve current.

This enhancement was discussed with the Nuclear Regulatory Commission staff on April 2nd and 22nd, 1987. The ammeters are currently being installed and will be operational prior to initial criticality. If there are any questions, please contact Mr . Zallnick of my staff.

Very truly yours, NIAGARA MOHAWK POWER CORPORATION PD R +300256 P "

ADOCH 0870423 0~000,0 PDR C. V. Mang Senior Vice President NLR/lmn (0901E)

Enclosure xc: Regional Administrator, Region I R. A. Capra, Director

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Mr. W. A. Cook, Resident Inspector Project File E

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~ Wx The air supply systems to the MSIV actuator accumulators on NMP2 is similar to that found on the RBS with the following exceptions.

NMP2 supplies the four inboard MSIV pilot valves and MSIV actuator accumulators with nitrogen gas from the instrument nitrogen system (GSN). The four NMP2 outboard MSIV pilot valves and MSIV actuator accumulators are sup)'7ied with air from the reactor building instrument system ( IAS). On River Bend, both inboard and outboard main steam isolation valves and MSIV actuator accumulator are supplied from the instrument air system ( IAS).

4. ~N Monitoring for NMP2 was described in detail in Section IIe5 above.

In addition, both RBS and NMP2 utilize ammeters to monitor pilot solenoid valve current. NMP2 monitoring devices are essentially the same as RBS with the following exceptions.

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NMP2 has MSIV status inputs to the off normal status display, while RBS does not.

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NMP2 and RBS both have indicator lights to monitor both MSIV pilot solenoid valves energized.

IV. ELECTRICAL COMPARISON OF NMP2 AND HANFORD'(WPPSS UNIT'82) a~ General-Descri tion of Control Lo ic The NMP2 Nuclear Steam Supply Shutoff System (NS4) functions are initiated when sensor signals, monitoring key parameters, exceed setpoints and de-energize relay control circuits, which initiate closure of the isolation valves. The control circuitry is arranged in dual systems so that a trip must occur in both trip systems to cause a closure of main steam isolation valve. Each trip system contains two independent tripping sensors from each measured variable, only one of which is required to activate a trip system.

The trip systems designated A and 8 are subdivided into logic channels A through D. MSIV logic channels A and C are in trip system A and logic channels B and D are in trip system B.

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Hatter of )

Niagara Mohawk Power Corporat-ion~ 3 Docket No. 50-410

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(Nine Mile Point Unit.2) j AFFIDAVIT C. V. Man an , being duly sworn, states that he is Senior Vice President of Niagara Mohawk Power Corporation; that he is authorized on the part of said Corporation to sign and file with the Nuclear Regulatory Commission the documents attached hereto; and that all such documents are true and correct to the best of his knowledge, information and belief.

Subscrrbed and sworn to before me, a Notary Publrc Sn and for the State of New York and County of , thrs day of i 1987.

Notar Public in and for County, New York Hy Commission expires:

I'DARY FRATEscH)

<o'ypublic In the State ot Now Qu>>ttted In Onondaga County tto, York 4ygygg 0 ty Contnstseton Ss(pjrea ~

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