ML20148A894

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Forwards IE Info Notice 79-17, Source Holder Assembly Damage from Misfit Between Assembly & Reactor Upper Grid Plate
ML20148A894
Person / Time
Site: Three Mile Island  Constellation icon.png
Issue date: 06/20/1979
From: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To: Herbein J
METROPOLITAN EDISON CO.
References
NUDOCS 7907110370
Download: ML20148A894 (1)
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UNITED STATES pg .

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'ie NUCLEAR REGULATORY COMMISSION

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June 20, 1979 Docket Nos. 50-320 50-289 Metropolitan Edison Company ATTN: Mr. J. G. Herbein Vice President - Generation P. O. Box 542 Reading, Pennsylvania 19640 Gentlemen:

This Information Notice is provided as an early notification of a possibly significant matter. It is expected that recipients will review the information for possible applicability to their facilities. No specific action or response is requested at this time. If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.

If you have questions regarding this matter, please contact this office.

Sincerely,

/ n Boyce H. Grier

' Director

Enclosures:

1. IE Information Notice No. 79-17
2. List of IE Information Notices Issued in 1979 cc w/encis:

E. G. Wallace, Licensing Manager J. J. Barton, Project Manager R. C. Arnold, Vice President - Generation L. L. Lawyer, Manager - Generation Operations G. P. Mil'ler, Manager - Generating Station - Nuclear J. L. Seelinger, Unit i Superintendent W. E. Potts, Unit 1 Superintendent - Technical Support J. B. Logan, Unit 2 Superintendent G. A. Kunder, Unit 2 Superintendent - Technical Support I. R. Finfrock, Jr.

Mr. R. Conrad G. F. Trowbridge, Esquire Miss Mary V. Southard, Chairman, Citizens for a Safe Environment 7907110 370 i

ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 IE Information Notice No. 79-17 Date: June 20, 1979 Page 1 of 2 SOURCE HOLDER ASSEMBLY DAMAGE FROM MISFIT BETWEEN ASSEMBLY AND REACTOR UPPER GRID PLATE Description of Circumstances:

Recently, the NRC was informed of a problem at two Westinghouse PWR facilities resulting from an apparent misfit between secondary source holder assemblies and the reactor upper grid plate.

The misfit problem was first identified by Carolina Power & Light, licensee for H. B. Robinson Unit 2, who informed the NRC on May 6, 1979, of the circum-stances. During the current refueling outage at H. B. Robinson 2, CP&L deter-mined that two secondary source holder assemblies had been damaged during the previous refueling in February 1978, by a misfit between the assembly and the reactor upper grid plate. The misfit resulted from insufficient clearance (i.e. 1/2 to 3/4 inch) between the source holder assembly hub and the grid plate at the core locations containing thermocouple mixing vanes. This lack of sufficient clearance caused minor deformation of the upper grid plate com-ponents at the core location and of the source holder assemblies. The deforma-tion also resulted in some bending of the fuel rods in the assembly, however, in no case did this bending result in fuel cladding perforation.

On May 16, 1979, the licensee of D. C. Cook Unit 1 informed the NRC that the present refueling outage would be extended 15 to 20 days to remove the reactor head, which had already been reinstalled following completion of refueling, to correct this misfit problem. They learned of the problem from Westinghouse.

Subsequently, the licensee's inspection revealed that the source holder.

assembly hubs were in contact with the vanes. The source holder uas removed from one assembly readily with no apparent damage while in the other the source holder was found stuck in the assembly. The problem was corrected prior to return to operations.

The secondary source assembly rods are normally inserted into rod cluster control assemblies and placed at symmetrical locations in the core. Each such assembly contains a symmetrical grouping of four secondary source rods and between zero and twenty burnable poison rods. Locations in the assembly not filled with a source or burnable poison rod contain ug. Th c of sufficient clearance for these sourcfEhmuoM,a we thimbg%h,ejh,k w -- _ -j only at the core locations which contai DUPLICATE DOCUMENT k Entire document previously entered jinto system under: j 790(o290J20 ANO No. of pages:

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Enclosure 1 IE Information No. 79-17 Date: June 20, 1979 Page 2 of 2 This Information Notice provides the details of a significant occurrence that is still under review by the NRC staff. If further NRC review indicates, an IE Circular or Bulletin may be issued to recommend or request specific licensee actions.

No written response is required. If you desire additional information regarding this matter, piene contact the Director of the appropriate NPC Regional Office.

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. ENCLOSURE'2 IE Information Notice No. 79-14 Date: June 20, 1979 Page 1 of 2 l LISTING OF IE INFORMATION NOTICES ISSUED IN 1979-Information Subject _ Date _

' Issued to Notice No. Issued .

79-01 Bergen-Paterson Hydraulic 2/2/79 All poser reactor '

Shock and Sway Arrestor facilities with an ,

Operating License

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(0L) or Construction Permit (CP)

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79-02 Attempted Extortion - 2/2/79 All Fuel Facilities Low Enriched Uranium 79-03 Limitorque Valve Geared 2/9/79 All power reactor Limit Switch Lubricant facilities with an OL or CP 79-04 . Degradation of 2/16/79 All power reactor Engineered' facilities with an Safety Features OL or CP 79-05 use of Improper Materials 3/21/79 All power reactor in Safety-Related Components facilities with an OL or CP 79-06 Stress Analysis of 3/23/79 All power reactor Safety-Related Piping facilities with an OL or CP 79-07 Rupture of Radwaste Tanks 3/26/79 All power reactor facilities with an OL or CP 79-08 Interconnection of 3/28/79 All power reactor Contaminated Systems with facilities with an Service Air Systems Used OL and Pu Processing As the Source of Breathing fuel facilities Air 79 Spill of Radioactivity. 3/30/79 All power reactor Contaminated Resin facilities'with an i OL 179-10l Nonconforming Pipe 4/16/79 All power reactor Support Struts facilities with a CP E

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,  : Enclosure 2- IE Inf$rmation Notice No. 79-17 Date: Junes20, 1979 Page 2 of.2-LISTING OF- IE'INFORMATION NOTICES ISSUED IN-1979

' Information - SubjectL Date- Issued to Notice.No. Issued 79-11 Lower Reactor Vessel Head 5/7/79 All power reactor '

Insulation Support Problem facilities with an OL or CP 79-12 Attempted Damage to New 5/11/79 All Fuel Facilities, Fuel Assemblies. Research Reactors, and Power Reactors with an OL or.CP 79-13 Indication of Low Water 5/29/79 All power reactor Level in the Oyster facilities with an Creek Reactor 10L or CP 79-14 Safety Classification of 6/11/79 All applicants for, Electrical Cable Support and holders of a Systems power reactor CP.

79-15 Deficient Procedures . 6/7/79 All power reactor facilities with an OL or CP 79-16 Nuclear Incident at 6/22/79 All research and Three Mile Island test reactors with an OL

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