ML17037C200

Letter Responding to February 15, 1975 and April 17, 1975 Letters and Enclosing a Report Discussing the Program and Schedule for a More Detailed Evaluation of the Effects Described in the Letters

ML17037C200
Person / Time
Site:	Nine Mile Point
Issue date:	05/05/1975
From:	Rhode G Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037C200 (8)

Text

NRC DISTRIBUTION FOR PART 50 DOCKF MATERIAL 0 (TEMPORARY FORM)

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5-5-75 5-10-75 TO: ORIG CC OTHER SENT AEC PDR Mr. George Lear 1 signed SENT I.OCAL PDR XX CLASS UNC LASS PROP INFO INPUT NO CYS REC'D DOCKET NQ:

1 50>>220 Ltr re our ltrs of 2-15-75 & Nine Mile Pt. Unit 1 Contain-4-17-75.2...furnishing info re relief valve ment .Design & Operational Effects.>> ..

blowdown phenomena 6l'ontainment hydrodynami r loads 6 trans the following:

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P~,.gy rl Ol rP>i Igp Mr. George Lear, Chief Operating Reactors Branch //3 ro I

g~ P~Gl dIC I C-M Division of Reactor Licensing U. S. Nuclear Regulatory Commission m Washington, D. C. 20555 CJl CI Re: Nine Mile Point Unit 1 Docket No. 50-220

Dear Mr. Lear:

Your letters of February 15, 1975 and April 17, 1975 requested information regarding relief valve blowdown phenomena and containment hydrodynamic loads. A preliminary evaluation, based on recent testing by General Electric Company, indicates that containment design parameters will not be exceeded during discharge of the relief valves. Operating experience, in addition to analytical work performed by General Electric for other facilities, do not suggest any operational safety problems with the Nine Mile Point Unit 1 containment.

The attached report discusses the program and schedule for a more detailed evaluation of the effects described in your letters. Be-cause of the scope of this effort, the schedule suggested in your letters cannot be accommodated. Further details of this tentative program will be submitted by July 5, 1975.

Very truly yours,

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NIAGARA MOHAWK POWER CORPORATION erald K. Rhe Vice President-Engineering

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NINE HILE POINT UNIT 1 Containment Design and Operational Effects This report is a preliminary response to Nuclear Regulatory Commission concerns ~ i > about containment hydrodynamic loads and relief valve blowdown effects. The following program and schedule for Nine Hile Point Unit 1 was devised at a recent meeting with General Electric and other utilities with boiling water reactors.

Initially an evaluation will be made of the hydrodynamic loads on the containment during accident conditions. This analysis will be similar to that performed by General Electric and discussed with the Nuclear Regulatory Commission in an April 10, 1975 meeting.

This will be submitted by August 4, 1975.

This evaluation will address the effect of pool swell on the drywell suppression chamber vent system. The submittal will include plan and section drawings of the containment. These will illustrate the structures, equipment and piping which could be subjected to hydrodynamic loads.

The tentative program and schedule as outlined below is" proposed as a response to meet the remainder of the concerns ad-dressed in the letters ~1~ ~ from the Nuclear Regulatory Commission.

A. Relief Valve Blowdown

1. Document relief valve vent June 30, 1975 clearing model

2. Perform impact tests for internal structure shapes June 30, 1975

3. Qualify impact model Septemb'er. 30, 1975

4. Determine need for plant September 30, 1975 stress test for relief valve discharge

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4 II B. Pool Swell

1. Calculate pool swell impact September 30, 1975 loads for Nine Mile Point Unit 1 "

2. Calculate other significant December 31, 1975 dynamic loads

3. Complete currently planned December 31, 1975 Nark I pool swell tests

4. Confirm calculated loads March 31, 1976

5. Perform stress analyses September 30, 1976 tests of suppression chamber, internals and supports

6. Combine stresses and compare December 31, 1976 to plant licensing basis.

(1) Letter dated Pebruary 15, 1975 to Mr. Gerald K. Rhode from George Lear.

'Letter dated April 17, 1975 to Mr. Gerald K. Rhode from George Lear.

(2)

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