ML18219D871

11/18/1977 Letter Additional Information on Over-Pressurization Mitigating System

ML18219D871
Person / Time
Site:	Cook
Issue date:	11/18/1977
From:	Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Case E Office of Nuclear Reactor Regulation
References
Download: ML18219D871 (9)

Text

U.S. NUCLEAR REGULATORY COM OOC UMBE~Jl NRC FCRM 195 (2 76) Ql

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/4 ILE NOQBER NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL FROM: DATE OF DOCUMENT TO:

Indiana & Michigan Power Company 11/18/77,/

Mr. Edson Gs Case New York, Ns Ys DATE RECEIVED John Tillin hast 11/21/77 IH LETTE R 0 NOTO 8 Z E D I PROP INPUT FORM NUMBER OF COPIES RECEIVED I@ORIGINAL EUN C LASS I F I E D GOOPY DESCRIPTION ENCLOSURE Consists of additional info concerning the Overpressurization Mitigating System for both units of Cook Nuclear Plant~ ~ ~ ~

notorized ll/18/77 ~ ~ ~ sw/att drawingss ~ ~ ~ ~

PLANT NAME Cook Units 1 & 2 (2-P)+(2-P)

RJL 11/21/77 DISTRIBUTION POR REACTOR VESSEL INFO POR NON"OPERATING REACTORS PER H, SMITH 9-8-76 Insist FLak. L<< (/>> <~z SAFETY OR CTION/INFORM TION BRANCH CHIEF: 4V 7 PROJECT MANAGER:

LIC. ASST:

INTERNAL D IST RI BUTION REG EILE K~DR I&E 3 OELD HEIHMAN SCHROEDER BOSaKK ROSS TEDESCO H, SMITH CROCKER bozsr EXTERNAL DISTR I BUTI ON CONTROL NUMBER LPDR: ~ OS TIC:

NS 77'>50106 ACRS 16 CYS /SENT NRC FORM 195 (2.76)

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INDIANA l MICHIGAN EMPOWER.'COVIPA'NR~-'~~~

P. O. BOX 18 BOWI.ING GREEN STATION HEW YORK, N. Y. 10004 November 18, 1977 Donald C. Cook Nuclear Plant Units 1 s 2 r.'.

Docket, Nos. 50-315 5 50-316 DPR NO ~ 58 Sc CPPR NO ~ 6 1 ~ <'L

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)~ggjH Qi>L Mr. Edson G. Case, Acting Director go ~1 Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commissi,on Q Washington, D.C. 20555

Dear Mr. Case:

The purpose of this letter is to provide additional information concerning the Overpressurization Mitigating System for both units of Cook Nuclear plant.

In our letter of August 4, 1977 we indicated, in response to Item No.4, that control room annunciation will be provided for the motor operated valves up-stream of the PORV's to alert the operator. if these valves are closed when the mitigating system is enabled. Figure No. 1 provides the revised electrical schematic for the mitigating system annunciators and shows electrical contacts 'for the -hard-wired" motor opexated valve alarms. In addition, this figure shows electrical contacts for a pressure alarm, transmitting to the control room, to alert the operator that the compxessed air bottle air pressure is low, as indicated in response to Item 6, of our August 4, 1977 letter. Figure No. 1,, is the final version for Overpressurization Mitigating System annun-ciators and replaces Figure No. 3 of our August 4, 1977 letter.

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Mr. E. G. Case November 18, 1977 The Overpressurization Mitigating System (OMS) will be enabled when the Reactor Coolant System pressure reaches 425 psig. This system will actuate the PORV when pressure incxeases above the system set point of 435 psig as indicated in Attachment 1 of our August, 4, 1977 letter.

We will be installing surface thermocouples on each steam generator (SG), above the tube sheet, to measure SG shell side temperature. The SG temperature will be shown on a temperature indicator so that the operator can compare SG temperature to the RCS cold leg temperature for the RCS loop in which a Reactor Coolant Pump (RCP) is to be started. Should the SG temperature exceed the RCS temperature by more than 50 F (AT)iin a loop, the RCP in that loop will not be started up until A,T is brought within limits (hT<50 F). Figure No. 2 shows the thermocouple locations on the SG. In addition, a spare thermocouple will be installed on each SG. We shall include this hT limit in our proposed technical specifications for Donald C. Cook Unit 2 and propose the same technical specification for Unit 1 by the time of installation of the so OMS that it can in Unit 1.

be available Very truly yours, n ill nghas ice 'President Sworn and su~b cribed to before me on this /P day of November1977'n New York County, New York Notar PpO>lie M. GURICAN GREGORY York Notary Public, Sfate of New cc: G. Charnoff No. St-4643431 Quafified in New York County~

R. Z. Vollen Cotnrnisston ExpIres March 30.

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