ML19253A694

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Updates 790706 Response to IE Bulletin 79-02.Summarizes Current Status of Program.Base Plates Identified & Hangar Flexibility Analysis Completed.Teledyne Anchor Bolt Test Program Final Rept to Be Submitted by mid-Aug
ML19253A694
Person / Time
Site: Oyster Creek
Issue date: 08/03/1979
From: Ross D
JERSEY CENTRAL POWER & LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7909110007
Download: ML19253A694 (2)


Text

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Y.54 Jersey Central Power & Light Company N=, ! Madison Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 August 3, 1979 Mr. Boyce H. Grier, Di rector Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 Dea r Mr. Grier:

SUBJECT:

Oyster Creek Nuclear Generating Station Docket No. 50-219 IE Bulletin No. 79-02 The purpose of this letter is to update cur response to Bulletin No. 79-02. Our initial report was submi tted to you on July 6, 1979 The current status of our program is summarized below:

IDENTIFICATION OF BASE PLATES The collection of data, drawings, load information , analyses ,

etc. is complete for all identi fied baseplates. Addi tional hangers, if found, during the remaining portions of the inspection and test program shall be analyzed and tested as soon as they are identified in the field.

ANALYSIS FOR FLEXIBILITY The analysis is complete for all identi fied hangers.

CYCLIC LOADING CAPABILITY TESTING The anchor bol t test program performed by Teledyne Engineering Se rvices for the 13-member utility group has been completed and a draft report has been issued to the member utili ties. The final report shall be issued and made available mid-August.

Conclusions drawn from the test results contained in the report support the position that cyclic loading of anchor bolts does not generally decay the ultimate capacity of the anchor.

IN-PLANT INSPECTION AND TEST PROGRAM To date, anchor bol t testing is 55% complete with satisfactory results in all but the following cases :

- three anchor bolts failed testing (remaining bolts were tested satisfactorily; failed bolts were replaced)

- one stud was sheared while attempting to remove nut fo r O[N263 inspection and test; the repai r has been completed.

7 9 0 9110 CO 7 Jersey Central Power & L:ght Company is a Memter of the General Puohc Ut.!aes System

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l Mr. Boyce H. Grier August 3, 1979 The remaining bolts to be tested are located in three types of a reas : 1.) accessible areas, 2.) inaccessible areas due to plant ope ra t i 7ns , e . g. Inside containment, and 3.) inaccessible areas due to high radiation and/or ai rborne contamination.

1.) Testing in accessible areas is in progress and shall be completed in approximately 4-6 weeks.

2.) Testing inside containment shall be performed during the next extended outage. The next planned extended outage is scheduled for Janua ry 5, 1980, our refue l ing outage.

3.) Hangers which a re inaccessible due to high radiation /

ai rbo rne , to date, total approximately 25. A hanger is considered to be in this category after reviewing ALARA considerations including radiation levels (usually above 500mr/hr.) and man hour requi rements including scaffolding erection time, i f requi red.

Based on the ve ry high success rate of the test program and a data base of more than hal f of the program completed, the re is reasonable assurance that a similarly high success rate would be achieved f rom testing these inaccessible hangers. The re fo re , these hangers shall be visually inspected during a quick walk down to determine proper location and type, but in light of the high dose rates, shall not be pull-tested.

At the completion of the test program, a follow-up report shall be submitted.

Ve ry t ruly yours, Cf;me< S W <e' A s Donald A. Ross, Manager F Generating Stations-Nuclear ck cc: NRC Office of Inspection and Enforcement Division of Reactor Operations inspection Washington, DC 20555

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