ML20086F719

Advises That Steam Generator B Bolt Support Returned to as-designed Condition & Corrective Action Complete

ML20086F719
Person / Time
Site:	Robinson
Issue date:	01/24/1975
From:	Utley E CAROLINA POWER & LIGHT CO.
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NG-75-074, NG-75-74, NUDOCS 8401040615
Download: ML20086F719 (3)

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CD&L Carolina Power & Light Company January 24, 1975 File: NG-3513 (R) Serial: NG-75-074 Mr. Norman C. Moseley, Director Directorate of Regulatory Operations U. S. Atomic Energy Commission Region II, Suite 818 -

230 Peachtree Street, N.W. '

Atlanta, Georgia 30303

Dear Mr. Moseley:

H. B. ROBINSON UNIT NO. 2 LICENSE HO. DPR-23 "B" STEAM GENERATOR BOLT An inspection of H. B. Robinson steam generator supports was conducted during the 1974 refueling outage. This inspection revealed that one of the upper support bolts was missing on the "B" Steam Generator. This condition was' referred to the plant architect-engineer, Ebasco Services, Inc.,

and a verbal statement was obtained to the effect that the integrity of the support was not jeopardized by the missing fastener. This conversation was to be confirmed by a written report. The inspection was reported to the AEC.

However, when the Ebasco report of November 8, 1974, was issued .

the evaluation of the condition was revised. Ebasco stated that it was their '

technical judgement that the missing bolt be replaced at the next scheduled plant shutdown. This was based upon meeting the criteria and limits established for the design, but the conservatism in design led to their technical opinion ~

that in the event of a LOCA the system would not fail even with one bolt not installed.

Based on this recommendation efforts were then begun to obtain a 1 certified bolt and fasteners for insertion in the vacant position of the support. l The bolt was obtained and certification verified by December 30, 1974. An outage was then scheduled for January 3, 1975 specifically to replace the miss-ing bolt. Subsequently, on January 3, 1975 after the unit was placed in a hot l

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t shutdownconditionandradiationlevelspermitted[afeentryaround"B" Steam

'Cenerator, the~ insulation was renoved from around the support and the bolt was installed. No problems were encountered with the insta11atien. Therefore, the support has been' returned to its as-designed condition and all corrective action completed.

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E. E. Utley

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