ML17053C403

Ack Receipt of W/Addl Info Re AOs 73-11-20 & 73-11-29 Involving Failures of Control Rods.Requests Response to Encl Questions to Clarify Proposed Conversion Program & Surveillance Provisions within 30 Days

ML17053C403
Person / Time
Site:	Nine Mile Point
Issue date:	03/20/1974
From:	Ziemann D US ATOMIC ENERGY COMMISSION (AEC)
To:	Schneider R NIAGARA MOHAWK POWER CORP.
References
NUDOCS 8103090464
Download: ML17053C403 (12)

Text

MAR 20 1974 Docket Ho. 50-220 Niagara Ifohawk Power Corporation ATTN: Hr. Rudolph R. Schneider Vice President Electric Operations 300 Erie Boulevard %lest

Syracuse, New York 13202 Gentlemen:

Ne have reviewed your letter dated December 21, 1973, providing additional information regarding abnormal occurrences AOR 73-11-20 and AOR 73-11-29 involving the failures of eleven (ll) and fifteen (15), respectively, control rods to insert to position 00 following a reactor scram.

Ve believe that the explanation provided in your letter is xeasonable and on that basis we conclude that there is no immediate concern regarding the ability to shut down the reactor and retain it in a shutdown condition.

You indicate that you will "..

. start a conversion program at the Spring 1974 refueling outage" to correct the seal deterioration problem.

In this regard you are requested to respond to the enclosed questions to clarify your proposed conversion program and the sur-veillance provisions that willbe made to detect fuxther significant deterioration in control rod scram performance.

This information is requested within 30 days of the date of this letter.

Sincerelyg Or.n.':.-~ sag.~e8 hV Dennis L.

niemann'ennis L

2,'iemann Chicf Operating Reactors Branch 82 Dixectorate of Licensing

Enclosure:

Request for Additional Information cc:

See next page

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MAR 20 1974 cc w/enclosure:

J. Bruce MacDonald, Esquire Deputy Commissioner and Counsel Hew York State Department of Commerce and Counsel to the Atomic Energy Council 99 Washington Avenue Albany, Hew York 12210 Axvin E. Upton, Esquire LeBoeuf, 7~amb, Leiby 6.HacRae 1757 N Street, N. W.

Washington, D, C.

20036 Dr. William Seymour Staff Coordinator Hew York State Atomic Energy Council Row York State Department of Commerce 112 State Street Albany, hew York 12207 Anthony K. Roisman, Esquire Berlin, Roisman and Kessler 1712 H Street, H. W.

Washington, D. C.

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ADDXTIOHALXNFOI&fATIOHRE UXRED CONTROL ROD SCRAM ANOMALY NXNB MZLB POINT UNIT 1 DOCKET MO. 50-220 l.

Provide details of the proposed conversion program and the schedule for completion of the conversion on all drives.

Details should include exactly what changes willbe made and why those changes are expected to prevent further seal deterioration while at the same time precluding recurrence of former problems with increased scram time due to the plugged fine mesh filters that were mounted on a traveling portion of the drive.

Xf immediate schedules do not include conversion of all drives, provide a tentative schedule for number of drives expected to be converted vs dates until all axe convexted, and describe repairs or overhaul of the unconverted drives to be performed in the interim.

2.

Provide details of the ezpected behavior of a single drive whose upper set of stop piston seals are leaking greater than 6 gpm, up to maximum leakage possible with complete detexioration of those seals.

Provide similar details for successive deterioration (up to complete deterioration) of both sets of seals (aH. four seals) on the stop piston.

Also describe any methods, testa, etc., that will or could be used to detect or measure amount of leakage from individual rods.

3, Address the same con@erne as in question 2 but for a large number of leaking rod drives connected to the same scxam, discharge

volume, How much total leakage would be required before scram performance would be affected'l How badly could scram pexformance be deteriorated under the worst conditions2 Describe any methods or tests that willbe or could be used to measure total leakage and/or its effects on scram performance.

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Note and return.

For concurrence.

For 5IEnature.

For action.

X For Inlormatlon.

TO (Name and unit)

RO Chief FS('NEB RO HQ (4)

DL (4)

RO Files DR Central Files To (Name and unit)

INITIALS ATE INITIALS REMARKS REMARKS NIAGARA MOHAI}tK9 NINE MILE POINT AO 50-220-74-1 The above AO is forwarded for information.

DATE To (Name and unit)

P INI'TIALS the PDR, Local PDR, NSIC, DTIE, and State REMARKS Representatives.

DATE FROM (Name and unit)

REMARKS E. J. Brunner Region I I}IONE NO.

DATE 8-337-124 3/4/74 USE OTHER SIDE FOR ADDITIONALREMARKS

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~<YES OI UNITEO STATES ATOMIC ENERGY COMMISSION DlACCTOYYATCOF RCGVI ATO BY OPCIY ATIONS IYCGION I b

631 PARK AVENUE KING OF PRUSSIA,'PENNSYLVANIA 19406 January 22, 1974 Niagara Mohawk Power Corporation Attention:

. Mr. R.

R. Schneider Vice President, Electric Operations 300 Erie Boulevard West

Syracuse, New York 13202 Docket No. 50-220 Gentlemen:

The enclosed Directorate of Regulatory Operations'nformation Request No. 74-1 is sent to you for response.

Please submit your reply within thirty (30) days of the date of this letter to this office with a copy to the Assistant Director for Construction and Operation, Directorate of Regulatory Operations, U. S. Atomic Energy Commission, Washington, D. C.

20545.

Very truly yours,

((p J

es P. O'Reilly Di ctor

Enclosure:

RO Information Request No. 74-1 cc:

Mr. T. J. Perkins, Station Superintendent Mr. A. Burt, General Superintendent bcc:.

RO Files MR Central Files PDR Local PDR NSIC DTIE Reg.

Reg.

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State of Massachusetts T+S'<'+Y~

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ce UNITED STATES ATOMIC ENERGY COMMISSION DlACCTOAATC OF BCGUl ATONY ORCRATIONS RCGION l 631 PARK AVENUE KING OF PRUSSIA, PENNSYLVANIA I9406 January 23, 1974 Niagara Mohawk Power Corporation Attention:

Mr. R.

R. Schneider Vice President, Electric Operations 300 Erie Boulevard Nest

Syracuse, New York 13202 Docket No. 50-220 Gentlemen:

Enclosed, as RO Bulletin 74-2, is information concerning a possible truck strike that may influence your shipment of special nuclear material.

Please note that should the strike occur and should you have special nuclear material shipments routed through the strike area, a report is requested of you.

Sincerely, James P. O'Reilly Director

Enclosure:

RO Bulletin No. 74-2 cc:

Mr. T. J. Perkins, Station Superintendent Mr. A. Burt, General Superintendent bcc:

RO+iles

~K Central Files PDR Local PDR NSlC DTIE Rcg.

Reg.

Rdg.

Rm.

State of New York