ML18219D950

05/10/1977 Letter Clarification on Flushing or Hot Functional Testing of Unit No. 2, Using the Auxiliary Feedwater System While Unit 1 Is in Operation

ML18219D950
Person / Time
Site:	Cook
Issue date:	05/10/1977
From:	Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Rusche B Office of Nuclear Reactor Regulation
References
Download: ML18219D950 (18)

Text

1IRC FORM 195

+479 I U.S. NUCLEAR REGULATORV COMMISSION OOCKET NUMIIFA Q <<3 F ILE NUMBER NRC DISTRIBUTION FQR PATT 50 DO CKET MATERIAL FROM: DATE OF DOCUMENT TO:

~ k Indiana 8: Michigan Power Company 5/10/77 Mr. Benard Co Rusche New York, No Yo ~ ~

DATE RECEIVED John 'i1linghas t -

5/16/77

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)('.C)RIG INAL X NCLASSIFIEO DCOPV OESCRIPTION ENCLOSURE Ltri potorized 5/10/77' ~ ~ ~ grans the folloOing: Consists of corrected figUr'ds showing the proper valve nomenclature old line-up related 'to the auxiliaryffeedwater system II (3-P) ('5-P)

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INDIANA II MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 May 10, 1977 Donald C. Cook Nuclear Plant Unit No. 1 Docket No. 50-315 DPR No. 58 ReguJatOIX'r.

Benard C. Rusche, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 h

Dear Mr. Rusche:

CD~ ( t~r This letter clarifies and amends our letter of April 6, 1977 regarding flushing or hot functional testing of Unit No. 2 using the auxiliary feedwater system while Unit 1 is in operation. A revision is necessary to the information transmitted in this previous letter regarding the identification of the valves and the safety requirements of the auxiliary feedwater system.

Corrected figures showing the proper valve nomenclature and line-up are attached to this letter. These figures show the valve alignment necessary to valve-out suction to the motor driven feedwater pumps from the Unit 1 condensate storage tank.

In the unlikely event the auxiliary feedwater to Unit 1 is required while flushing or hot functional testing operations in Unit 2 are underway, water will be available to the motor driven feedwater pumps from the Unit 2 condensate storage tank. The auxiliary feedwater valves to Unit 2 will automatically close, and the valves from the motor-operated auxiliary feedwater pumps to Unit 1 will be opened by the operator from the control room.

Further, during both flushing and hot functional testing operations, the Unit 2 condensate storage tank water volume will be maintained at a minimum of 175,000 gallons (the same as is currently required for the Unit 1 tank) by administrative control.

Thus, this valve alignment replaces the Unit 2 condensate storage 77g360 32

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Mr . Benard C. Rusch May 10, 1977 tank for the Unit 1 tank as the suction for the motor driven feedwater pumps. This assures that the same degree of system redundancy and reliability is maintained as is requixed under our current mode of operation.

Xn our April 6, 1977 letter we also stated, that in the event auxiliary feedwater is required for Unit No. 1 during these operations, it would take 30 minutes to switch the motor driven feedpump to the Unit 1 tank. By tying into the Unit 2 condensate storage tank as described above, this reliance on a 30 minute switchover time is not required to assure auxiliary feedwater to Unit l. A further statement is made that xeferences the 30 minute time requirement for the accident analysis in FSAR Section 14.2.4, the steam genexator tube rupture. Other analyses, such as the loss of feedwater, require auxiliary feedwater in shorter times.

As stated above, the intended mode of operation during flushing and hot functional testing will not significantly change the times associated with delivery of auxiliary feedwater, but will only change the source of water to the motor driven auxiliary feedwater pumps. Therefore, it is concluded that the technical specification interpretation in our April 6, 1977-'letter does not change the mode of auxiliary feedwater operation as used in the safety analysis and therefore does not constitute an unreviewed safety pxoblem nor will of the public.

it adversely affect, the health and safety We will assume our interpretation of the Technical Specifications and reporting requirements to be correct. with respect to our flushing and hot functional testing requirements unless we hear otherwise from you.

Very truly yours, ohn 1 ing s Vice Presid n JT:mam Sworn and subscribed to before me this 'le+'day of May 1977 in New York County, New York KATHLEl' BARRY NOTARY PUIILIC, State ol New York Notary Public No. 41-4606'i 92 Qualitied in Queens County Certilicate tiled in New York County cc: see next page Commission Expires March 30, 19'

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