ML19339A284

Requests That Encl Preservice Insp & Testing Requirements to Ensure Snubber Operability Be Included in Licensing Process & Be Implemented at Facility

ML19339A284
Person / Time
Site:	Limerick
Issue date:	10/17/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
References
NUDOCS 8011030525
Download: ML19339A284 (4)

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UNITED STATES NUCLEAR REGULATORY COMMISSION

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E WASHINGTON, D. C. 20555 o, h, '2) ' fI

%.%.... f Docket Nos. 50-352 OCT 12 1980 end 50-353 Mr. Edward G. Bauer, Jr.

Vice President & General Counsel Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101

SUBJECT:

PRESERVICE INSPECTION AND TESTING 0F SNUBBERS The Office of Inspection and Enforcement has requested that preservice inspection and test requirements for snubbers be inclJded in the licensing process. Based on this request and the long history of snubber problems as documented by Licensee Event Reports on the subject of inoperable and incorrectly installed snubbers, it is requested that the enclosed requirements to insure snubber operability be implemented at the Limerick Generating Station.

Sincerely,,

1 ertL.

desco Assistant Director for Licensing

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Division of Licensing

Enclosure:

As stated cc w/ enclosure:

See next page i

40 2 3 03 0 5'Rg

Mr. Edward G. Bauer, Jr.

Vice President & General Counsel Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 cc: Troy B. Conner, Jr., Esq.

Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.

Washington, D. C.

20006 Deputy Attorney General Room 512, Main Capitol Building Harrisburg, Penn',ylvania 17120 Mr. Robert W. Adler Assistant Attorney General Bureau of Regulatory Counsel 505 Executive House P. 0. Box 2357 Harrisburg, Pennsylvania 17120 Honorable Lawrence Coughlin House of Representatives Congress of the United States Washington, D. C.

20515 Rager B. Reynolds, Jr., Esq.

324 Swede Street Norristown, Pennsylvania 19401 Lawrence Sager, Esq.

Sager & Sager Associates 45 High Street Pottstown, Pennsylvania 19464 Joseph A. Smyth Assistant County Solicitor County of Montgomery Courthouse Norristown, Pennsylvania 19404 Eugene J. Brafsey Philadelphie Electric Company Associate General Counsel 2301 Market Street Philadelphia, Pennsylvania 19101 Mr. Moseph C. Mattia Resident Reactor Inspector U. S. Nuclear Regulatory C ;amission P. O. Box 47 Sanatoga, Pennsylvania 19464 I

TO ALL APPLICANTS:

l Due to a long history of problems dealing with inoperable and incorrectly installed snubbers, and due to the potential safety significance of failed snubbers in safety related systems and comporents,11. is requested that maintenance records for snubbers be document 1d as follows:

g Pre-service Examination A pre-service examination should be made on all snubbers listed in tables 3.7-4a and 3.7-4b of Standard Technical Specifications 3/4.7.9 This exami-nation should be made after snubber installation but not more than sf x months prior to initial system pre-operational testing, and should as a minimum verify the following:

(1) There are no visible signs of damage or impaired operability as a result of storage, handling, or installction.

(2) The snubber location, orientation, position setting, and cor figuration (attachments, extensions, etc.) are according to design drawrigs and specifictions.

(3) Snubbers are not seized, frozen o;- jammed.

(4) Adequate swing clearance is provided to allow snubber movement.

(5)

If applicable, fluid is to the recommended level and is not leaking from the snubber system.

(6) Structural connections such as pins, fasteners and other connecting hardware such as lock nuts, tabs, wire, cotter pins are installed correctly.

If the period between the initial pre-service examination and initial system pre-operational test exceeds six months due to unexpected situations, re-examination of items 1,4, and 5 shall be performed. Snubbers which are installed incorrectly or otherwise fail to meet the above requirements must be repaired or replacad and re-examined in accordance with the above criteria.

Pre-Operational Testing During pre-operational testing, snubber thermal movements for systems whose operating temperature exceeds 250' F should be verified as follows:

(a )

During initial system heatup and cooldown, at specified temperature intervals for any system which attains operating temperature, verify the snubber expected thermal movement.

(b) For those systems which do not attain operating temperature, verify via observation and/or calculation that the snubber will accommodate the projected thermal movement.

(c) Verify the snubber swing clearance at specified heatup and cooldown intervals. Any discrepencies or inconsistencies shall be evaluated for cause and corrected prior to proceeding to the next specified interval.

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• The above described operability program for snubbers should be included and documented by the pre-service inspection and pre-operational test programs.

The pre-service inspection must be a prerequisite for the pre-operational testing of snubber thermal motion. This test program should be specified in Chapter 14 of the FSAR.

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