ML20056F866

Discusses Plant Drywell Temp Conditions & Activation Energy for Brand-Rex Cable.Nrc Reviewed Info Provided & Found Approach Acceptable

ML20056F866
Person / Time
Site:	Perry
Issue date:	08/16/1993
From:	Robert Stransky Office of Nuclear Reactor Regulation
To:	Stratman R CENTERIOR ENERGY
References
TAC-M75070, NUDOCS 9308310232
Download: ML20056F866 (5)

Text

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August 16,19')3 Docket No. 50-440 Mr. Robert A. Stratman f

Vice President Nuclear - Perry Centerior Service Company Post Office Box 97, S270 l

Perry, Ohio 44081 t

SUBJECT:

PERRY NUCLEAR POWER PLANT, UNIT NO. 1 - DRYWELL TEMPERATURE l

CONDITIONS AND ACTIVATION ENERGY FOR BRAND-REX CABLE (TAC NO.

M75070)

By your letter dated April 19, 1989, and Licensee Event Reports 89-010-00 and 89-010-01, you notified the NRC that an elevated temperature condition had existed within the upper drywell region of Perry, Unit 1.

This condition was j

the result of insufficient insulation surrounding the refuel bellows which created a radiant heat source above the bioshield. The elevated temperature condition caused heat damage to cable and mechanical snubbers within the e'

affected zone of the radiant heat source during the first operating cycle.

You reported that safety-related cables supplying logic train B of the automatic depressurization system and two hydrogen igniters were visibly j

damaged, presumably making the associated equipment inoperable. No actual failure of safety-related equipment was identified, and all affected safety-related and visibly damaged nonsafety-related cables were replaced. All snubbers in the upper drywell were stroke tested, and two were replaced.

You also stated that, in order to prevent recurrence, reflective insulation was installed on the drywell side of the refuel bellows and on main steam piping to provide shielding of the affected zone.

In addition, air flow i

through the annulus was improved and a ' temporary temperature monitoring i

program was established.

You further stated that temperatures in the upper drywell region have been significantly reduced; however, engineering i

evaluations and modifications will continue as necessary until acceptable

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local temperatures are attained near all safety-related cables. Safety-related cables in the heat affected area will be replaced as necessary based i

on their calculated qualified life.

The NRC staff has reviewed the information you provided and found your approach generally acceptable. However, the NRC staff had a concern that the r

activation energy of 2.13 electron volts (ev) used in your calculations'for the Brand-Rex cable was too high. - On January 28, 1993, B. Ferrell of your staff' informed J. Hopkins of the NRC that concern is now moot-for the Brand-Rex cable of interest, because it was replaced with Rockbestos high i

temperature control cable during the second refuel outage.

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9308310232 930816 i

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Robert A. Stratman August 16, 1993 For other Brand-Rex cable not subjected to the elevated temperature condition, you performed an analysis using the Arrhenius technique with an activation energy of 1.26 ev at an average temperature of 145 degrees Fahrenheit in conjunction with an aging temperature of 136 degrees Celsius. On February 4, 1993, B. Ferrell and S. Patel of your staff informed J. Hopkins that analysis resulted in a qualified life of greater than 40 years and is referenced in the equipment qualification files. Your July 8,1993, submittal documented this conclusion and summarized other actions taken at Perry to improve the environmental conditions in the upper drywell area to prolong cable life.

This letter concludes NRC staff actions regarding TAC No. M75070.

If you have any questions regarding this letter, please contact me at 301 504-1346.

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/J. Stransky, Project Manager t-roject Directorate III-3 Division of Reactor Projects III/IV/V

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Robert A. Stratman Augut. 16, 1993 For other Brand-Rex cable not subjected to the elevated temperature condition, you performed an analysis using the Arrhenius technique with an activation energy of I.26 ev at an average temperature of 145 degrees Fahrenheit in conjunction with an aging temperature of 136 degrees Celsius. On February 4, 1993, E. Ferrell and S. Patel of your staff informed J. Hopkins that analysis resulted in a qualified life of greater than 40 years and is referenced in the equipment qualification files.

Your July 8,1993, submittal documented this conclusion and summarized other actions taken at Perry to improve the environmental conditions in the upper drywell area to prolong cable life.

This letter concludes NRC staff actions regarding TAC No. M75070.

If you have any questions regarding this letter, please contact me at 301 504-1346.

Sincerely, Original Signed By:

Robert J. Stransky, Project Manager Project Directorate III-3 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation DISTRIBUTION Docket File PDIII-3 Gray NRC & Local PDRs Region III, DRP PDIII-3 r/f JRoe JZwolinski JHannon MRushbrook RStransky OGC ACRS(IO)

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['////93 y /j(,/93 DOCUMENT NAME:

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i Mr. Robert A. Stratman Perry Nuclear Power Plant Centerior Service Company Unit Nos. I and 2 cc:

Jay E. Silberg, Esq.

Mr. James W. Harris, Director Shaw, Pittman, Potts & Trowbridge Division of Power Generation 2300 N Street, N.W.

Ohio Department of Industrial Relations Washington, D.C.

20037 P. O. Box 825 Columbus, Ohio 43216 Mary E. O'Reilly Centerior Energy Corporation The Honorable Lawrence Logan 300 Madison Avenue Mayor, Village of Perry Toledo, Ohio 43652 4203 Harper Street Perry, Ohio 44081 Resident inspector's Office The Honorable Robert V. Orosz U.S. Nuclear Regulatory Commission Mayor, Village of North Perry Parmly at Center Road North Perry Village Hall Perry, Ohio 44081 4778 Lockwood Road North Perry Village, Ohio 44081 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Attorney General 799 Roosevelt Road Department of Attorney General Glen Ellyn, Illinois 60137 30 East Broad Street Columbus, Ohio 43216 Lake County Prosecutor Lake County Administration Bldg.

Radiological Health Program 105 Main Street Ohio Department of Health Painesville, Ohio 44077 Post Office Box IIB Columbus, Ohio 43266-0118 Ms. Sue Hiatt Ohio Environmental Protection Agency OCRE Interim Representative DERR--Compliance Unit 8275 Munson ATTN:

Zack A. C'.ayton Mentor, Ohio 44060 P. O. Box 1049 Columbus, Ohio 43266-0149 Terry J. Lodge, Esq.

618 N. Michigan Street, Suite 105 Mr. Thomas Haas, Chairman Toledo, Ohio 43624 Perry Township Board of Trustees 3750 Center Rd., Box 65 Perry, Ohio 44081 Ashtabula County Prosecutor State of Ohio 25 West Jefferson Street Public Utilities Commission Jefferson, Ohio 44047 East Broad Street Columbus, Ohio 43266-0573 Mr. Kevin P. Donovan Cleveland Electric Illuminating Company David P. Igyarto, General Manager Perry Nuclear Power Plant Cleveland Electric Illuminating Company P. O. Box 97, E-210 Perry Nuclear Power Plant Perry, Ohio 44081 Post Office Box 97, SB306 Perry, Ohio 44081

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Mr. Robert A. Stratman Perry Nuclear Power Plant Centerior Service Company Unit Nos. I and 2 cc:

James R. Williams, Chief of Staff Ohio Emergency Management Agency 2825 West Granville Road Worthington, Ohio 43085 t

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