ML20049H838

Submits Response to NRC 820204 Ltr Re Interlocks Dependent on Pressure Signals for Valves Connecting Low Pressure ECCS W/Rcs

ML20049H838
Person / Time
Site:	Zimmer
Issue date:	02/25/1982
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8203040260
Download: ML20049H838 (2)

Text

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l l I THE CINCINNATI GAS & ELECTRIC COMPANY WWI' '

CINCIN N ATI, OHIO 45201 E. A. BORO MAN N stNeOR VICE PRCSIDENT Docket No. 50-358 February 25, 1982 Mr. Harold Denton, Director Office of Nuclear Reactor Regulation @ g U.S. Nuclear Regulatory Commission Washington, D.C. 20555 /f g RE: WM. H. ZIMMER NUCLEAR POWER STATION - .

UNIT 1 - INTERLOCKS FOR LOW PRESSURE OL-MAR 031982m- T4 ECCS VALVES, NRC FEBRUARY 4, 1982 LETTEF Q ggg g g g '

HCauf NeuDEN u

Dear Mr. Denton:

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This is in reply to the February 4, 1982 letter #

y Mr. Robert L. Tedesco to Mr. E. A. Borgmann. The subject of this letter was the interlocks dependent on pressure signals for valves connecting the low pressure ECCS with the reactor coolant system.

Attached is the information requested. CG&E believes this response adequately addresses the Staff's concern on this issue.

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY v

EAB: dew E. A. BORGMANN Enclosure cc: John H. Frye III State of Ohio )

M. Stanley Livingston County of Hamilton)ss .

Frank F. Hooper Troy B. Conner, Jr. Sworn to and subscribed before James P. Fenstermaker me this A S TL day of February, Steven G. Smith 1982.

William J. Moran J. Robert Newlin Samuel H. Porter -

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James D. Flynn W. F. Christianson d6n h dhed Notary Public James H. Feldman, Jr.

AllCE M. LEUROK John D. Woliver Notary Pub:Ic, State of Ohio .

Deborah F. Webb gyc m ulonnpcsoncus: 16, 1936 --

David K. Martin George E. Pattison Andrew B. Dennison ()#l 8203040260 820225 f I PDR ADOCK 05000358 y, A PDR

1 Docket No. 50-358 ATTACHMENT WM. H. ZIMMER NUCLEAR POWER STATION - UNIT 1 INTERLOCKS DEPENDENT ON PRESSURE SIGNALS FOR VALVES CONNECTING LOW PRESSURE ECCS WITH THE REACTOR COOLANT SYSTEM The following information is submitted in response to NRC letter of February 4, 1982:

1. Each low pressure ECCS injection line has a motor operated gate valve utilized as an injection valve. A check valve is in series with each injection valve. The low pressure coolant injection valves are lE12-F042A,B,C and the low pressure core spray valve is 1E12-F005.

2. Each motor' operated valve has a number of permissives which must be satisfied before the valve can be automatically opened.

These include 1) power available, 2) no manual override initiated,,3) ECCS initiation signal, 4) differential pressure interlocks which operates when the differential pressure between the reactor coolant system and the low pressure ECCS system is less than 700 psid.

Manual operation is interlocked with the differential pressure interlock. Valves lE12-F042A and B also have a permissive indicating that automatic wetwell spray is not initiated in both the manual and automatic modes.

The identification of each interlock relay is tabulated below. Reference the following diagrams in Volume llA of the FSAR:

Low Pressure Coolant Injection, Figure 7.3-20, Sheets 1, 2, 3, 20 and 21 Low Pre ~sure-Core Spray, Figure 7.3-19, Sheets 2 and 3.

Interlock lE12-F042A lE12-F042B lE12-F042C lE21-F005 Wetwell Spray Permissive K112A Kll2B N/A N/A ECCS Initiation K9A K94B K94B K10 Power Available - K3A K3B K3B Kl Manual Override K24A K24B K26 K15 Differential Pressure K103A K103B K103C K8

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