05000312/LER-1982-010, Forwards LER 82-010/01T-1.Optimum Repair Schedule Encl

Forwards LER 82-010/01T-1.Optimum Repair Schedule Encl

ML20053C090
Person / Time
Site:	Rancho Seco
Issue date:	05/19/1982
From:	Latham W SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20053C091	List: 05000312/LER-1982-010, Forwards LER 82-010/01T-1.Optimum Repair Schedule Encl 05000312/LER-1982-010-01, /01T-1:on 820419,insp of B once-through Steam Generator Auxiliary Feedwater Header Ring & a Ring on 820420 Revealed Deformations.Mod Work to Correct Problem Partially Scheduled.Old Header Will Be Stabilized
References
NUDOCS 8206010481
Download: ML20053C090 (2)

LER-1982-010, Forwards LER 82-010/01T-1.Optimum Repair Schedule Encl

Event date:
Report date:
3121982010R00 - NRC Website

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$ SMUD 95813; (916) 452-3211

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SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 s street, Box 15830. sauamento. Cahfornia

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f4ay 19,1982 R H Ef1GELKEN, REGIONAL ADMINISTRATOR REGION V 0FFICE OF INSPECTION AND ENFORCEMENT U S NUCLEAR REGULATORY COMMISSION 1450 f1 ARIA LANE SUITE 210 WALNUT CREEK CA 9459f; DOCKET NO. 50-312 LICENSE NO. DPR-5/!

REPORTABLE OCCURRENCE l'O. 82-10 In accordance with Pancho Seco Nuclear Generatino Station Technical Specifications :ection 6.9.4.1.i and Regulatory Guide 1.16 section C.2.a.(9), the Sacramento Municipal Utility District hereby submits a followup to Licensee Event Report number 82-10, as submitted to your office on fpril 20, 1982 and April 29, 1982.

On April 19, 1982, inspection of the Rancho Seco pnit 1 "B" Once Through Stem Generator (0lSG) auxiliary feedwater header rino revealed defonnations similar to that reported for Davis-Besse, Unit 1.

Inspection of the Rancho Seco "A" OTSG on April 20, 1982, revealed similar defonnations to the "B" 0TSG.

Corrective action for this occurrence has been determined to include stabilization of the existing internal header and the addition of a new external header ring.

The District has established the attached schedule (Attachment I) for the work on the OTSr.'s.

Please note that this is a "best case" schedule dnd the actual repairs may take loncer than planned here if unforseen difficulties are encountered.

Additional schedulino information can be provided at a later date as requested.

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ATTACHMENT I OPTIMUM REPAIR SCHEDULE FOR OTSG's DATE ACTIVITY 5-21-82 Start hole drilling on "B" 0TSG.

5-24 Drilling on "B" OTSG complete.

5-25 Start stabilizing the old (internal) ring header on the "B"

0TSG.

5-26 Stabilization of "B" OTSG internal ring header complete.

5-27 Start hole drilling in "A" 0TSG.

l 5-30 Drilling on "A" OTSG complete.

6-1 Start stabilizing internal ring header on "A" 0TSG.

6-1 Firstnest (external) ring header delivered.

6-2 Stabilization of "A" 0TSG internal ring header complete.

5-2 Begin installation of extern 31 ring header for "B" 0TSG.

t 6-3 Begin Eddy Current testing of "B" OTSG.

6-7 Second external ring header received.

Begin installation of external ring header for "A"

OTSG.

6-8 6-8 Begin Eddy Current testing on "A" 0TSG.

6-14 Eddy Current testing on "A" 0TSG complete.

6-15 External ring header for "B" 0TSG installed.

6-21 External ring header for "A" 0TSG installed.

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