ML17037B560

Letter Requesting That Niagara Mohawk Power Corp Provide a Response to Questions Concerning Inspection of Feedwater Nozzle Blend Radii

ML17037B560
Person / Time
Site:	Nine Mile Point
Issue date:	04/12/1976
From:	Lear G Office of Nuclear Reactor Regulation
To:	Rhode G Niagara Mohawk Power Corp
References
Download: ML17037B560 (6)

Text

1 Docket Ho. 50-220 Niagara Mohawk Power Corporation ATTN: 'r. Gerald K. Rhode Vice President Engineering 300 Erie Boulevard Hest

Syracuse, Hew York 13202 Gentlemen; RE:

NINE MILE POINT NUCLEAR STATION UNIT l The recent discovery of cracks in the feedwater nozzle blend radii at Quad Cities l and Pilgrim l Nuclear Power Stations, ooupled with the previous discoveries at other stations, has amplified the need to determine the exaot cause of the problem and thus undertake the proper short-term and long-term oorrective actions.

Your assistance is needed in the collection of pertinent data.

You are therefore requested, within 30 days of receipt of this letter, to provide response to the following questions:

l. If inspection(s) of feedwater nozzle blend radi1 has (have) been accompl1shed, supply the following information:

(a)

Date of inspection(s) r (b)

Inspeotion method used J

(c)

Inspection results and subsequent actions - number of cracks found; number of cracks which penetrated the cladd1ng into the base metal; maximum depth of cracks; general location of worst cracking around each nozzle; method used to. remove cracks; cross-sectional area of reinforcement removed at the worst grind-out location; subsequent inspections and results.

(d) If inspection report(s) has (have) been previously submitted to the NRC containing the desired informat1on of (a), (b),

and (c), provide reference to the report(s) in lieu of the information in (a), (b), and (c).

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2. If no inspection of feedwater nozzle blend radii has been conducted, provide date inspect1on is planned and date of next planned refueling outage.

3 ~ If inspection(s) and repair(s) has (have) been undertaken, provide date of next planned inspection.

4.

Provide the number of startup/shutdown cyoles to the date of the inspection, if already aocomplished, and the number of cyoles since such inspection. If no inspection has been conduoted, 'provide the estimated number of cycles at the planned inspection date.

A startup/shutdown cycle is defined as a power incr ease from zero and subsequent retur n to zero.

5; Descr1be-actions taken or planned to minimize cold, interm1ttent feedwater flow to the reaotor pressure vessel.

Include changes 1n operating procedures and any redesign of feedwater heatevs,

pumps, flow control valves, piping, etc.

6.

Describe reactor pressure vessel pressure>>temperature limits for operating conditions and especially for the inser vice-hydvostatic and leak tests.

One signed original and 39 copies of your answer will be necessary.

This request for generic information was approved by GAO under a blanket olearance number B-180225 (R0072); this clearance expires July 31, 1977.

Sincerely, Geor ge Lear, Chief Operating Reactors Branch 03 Division'f Operating Reactors cc:

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/76 Form h11C 318 (Rcv. 9.53) hECM 0240 4 U, 0, OOVCRNMKIITPRIHTINO ORRICRI I074 ddd Idd

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CC:

Arvin E. Upton, Esquire

LeBoeuf, Lamb, Leiby 5 MacRae 1757 N Street, N.

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Washington, D. C.

20036 Anthony Z. Roisman, Esquire

Roisman, Kessler and Cashdan 1712 N Street, N.

W.

Washington, D. C.

20036 Dr. William Seymour, Staff Coordinator New York State'tomic Energy Council New York State Department of Commerce 99 Washington Street

Albany, New York 12207 Oswego City Library.

120 E. Second Street Oswego,.

New York 13126 Mr. Robert P. Jones, Supervisor Town of Scriba R. D.

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Oswego, New York 13126

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