ML19341C702

Requests That Encl Preservice Insp & Test Requirements to Insure Snubber Operability Be Implemented at Facility

ML19341C702
Person / Time
Site:	Callaway
Issue date:	02/10/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Bryan J UNION ELECTRIC CO.
References
NUDOCS 8103031087
Download: ML19341C702 (4)

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UNITED ::TATEs 7 3 s-,,

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Docket No. 50-483 ggE.1'o.((.16 8

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Mr. John K. Bryan i

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Union Electric Company j

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SUBJECT:

PRESERVICE INSPECTION AND TESTING OF SNUB 8ERS - CALLAWAY PLANT, UNIT 1 i

The Office of Inspection and Enforcement has requested that preservice inspection and test requirements for snubbers be included 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 Callaway Plant, Unit 1.

- Sincerely, s

f Robert L. Tedesco, Assistant Director for Licensing Division of Licensing

Enclosure:

j As stated cc w/ enclosure:

See next page l

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81030340C

Mr. J. K.. yan Vice President - Nuclear Union Electric Company P. O. Box 149 St. Louis, Misscuri 63166 cc: Mr. Nicholas A. Petrick Mr. William Hansen Executive Director - SNUPPS Resident Inscector/Callaway NPS 5 Choke Cherry Road c/o USNRC Rockville, Maryland 20850 Steedran, Missouri 65077 Gerald Charnoff, Esq.

Shaw, Pittman, Potts &

Trowbridge 1800 M Street, N. W.

Washington, D. C.

20036 Mr. J. E. Birk Assistant to the General Counsel Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 Dr. Vern Starks Route 1, Box 363 Ketchikan, Alaska 99901 Ms. TrevaHearn, Assistant General Counsel

'41ssouri Public Service Commission P. O. Box 360 Jeffersen City, Missouri 65102 Mr. D. F. Schnell Manager-Nuclear Engineering Union Electric Company P. O. Box 149 St. Louis, Misscuri 63166

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TO ALL APPLXCANTS:

Due to a long history of problems dealing with inoperable and incorrectly installed snubbers, and d'Je to the potential safety significance of failed i

snubcers in safety related systems and components, it is requested that maintenance records for snubbers be documented as follows:

Pre-service Examination 1

A pre-service examinatiot should be made on all snubbers listed in tables 3.7-4a and 3.7-4b of Standard Technical Specificatiens 3/4.7.9 This exami-nation should be made after snubber installation. but not more tnan six-montns prior to initial system pre-operational testing! and should as a mimimum verify the following:

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

(2) The snubber location, orientation, position setting, and configuration (attachments, extensians, etc.) are according to design drawings and specifictions.

(3) Snubbers are not seized, froten or 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 wnich are installed incorrectly or otherwise fail to meet the above requirements must be repaired or replaced and re-examined in accordance with the above criteria.

Pre-Coerational Testino 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 accommocate the projected thermal movement.

(c) Verify the snubcer swing clearance at s:ecified heatus and cocidown intervals. Any discrepencies or inconsistencies shall be evaluaced for cause and corrected prior to proceeding to the next specified interval, 4

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

programs.

rerequf site for the pre-operational stin o ubb r

• e a on-in Chapter 14 of the FSAR.

i5 tes,. program should be Specified sk-e O

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