ML18220A507

Providing Additional Information Concerning the Overpressurization Mitigating System

ML18220A507
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
Figure 1 and 2
Download: ML18220A507 (5)

Text

NRC FC.IM 1BB U.S, NUCLEAR REGULATORY COMMISSION DOCKET NUM BE~

I2.75> v/4 FILE NUMBER NRC DISTRIBUTION FoR PART 60 DOCKET MATERIAL TO: FROM:. DATE OF DOCUMENT Indiana & Michigan Power Company 11/I.8/77/

Mr. Edson Gi Case New York, No Yo DATE RECEIVED John Tillin hast 11/21/77 NLETTE R Cl NOTO R I ZE D PROP INPUT FORM NUMBER OF COPIES RECEIVED jEO RIG IN AL I8fUNCLASSIFIED Qcopv DESCRIPTION ENCLOSURE Consists of additional info concerning,...,

the Overpressurizatio'n Mit1gating System for both units of Cook Nuclear Plant+ ~ ~ ~

notorized 11/18/77 ' ~ w/att drawings ~ ~ i ~ ~

PLANT NAME Cook Units 1 8 2 ( 2-P )+(2<<P )

RJL ll/21/77 DISTRIBQTION FOR REACTOR VESSEL INFO FOR NON-OPERATING REACTORS PER H, SMITH 9-8-76 4isw FI=ek, SAFETY L<< OR CTION/INFORM TION BRANCH CHIEF: 4V 7 PROJECT MANAGER:

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INTERNAL D IST RI BUTION G FILE ICE 3 OELD HEIHMAN SCHROEDER BOSNAK ROSS TEDESCO H SMITH CROCKER EXTERNAL DISTRIBUTION CONTROL NUMBE R LPDR: T OS TIC:

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INDIANA R MtCHtGAN POWER COMPANY" " '.

O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 November 18, 1977 Donald C. Cook. Nuclear. Plant.

Docket Nos. 50-315 & 50-316 Units. 1 s 2. (/

r DPRo NO 58 8t CPPR NO 61

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CC i4)$5 iC Qs ~ 'CP ~)os Mr. Edson G Case, Acting Director iWI-Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ~<~> i~

Washington, D.C. 20555

'ear 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 xesponse 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 operated valve alarms. In addition, this figure shows electrical contacts for a pressure alarm, transmitting to the control room, to alert the operator that the compressed 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 xeplaces Figure No. 3 of our August 4, 1977 letter

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 increases 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'emperature 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) in a loop, the RCP in that loop will not be started up until 4T is brought within limits (hT<50 F) . Figure No. 2 shows the thermocouple locations on the SG. Xn add'ition, a spare thermocouple will be installed on each SG. We shall include this aT limit in our proposed technical specifications for Donald C. Cook Unit 2 and propose the same technical specification for Unit 1 so that it OMS in Unit l.

can be available by the time of installation of the Very truly yours, n a.ll nghas ice President Sworn and subscribed to before me on this I day of November1977 in New York County, New York Notary. P,ublic GREGORY f4. GURICAH York Notary Public. State ol New CC: G. Charnoff fio. 31.4643431 Guafified in ffaw York Ccuni"I . <

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