NRC Generic Letter 1983-08

NRC Generic Letter 1983-008: Modification of Vacuum Breakers on Mark I Containments

ML031080206
Person / Time
Site:	Mcguire, Catawba, Watts Bar, Summer, McGuire, 05000000
Issue date:	02/02/1983
From:	Eisenhut D G Office of Nuclear Reactor Regulation
To:
References
GL-83-008, NUDOCS 8302090089
Download: ML031080206 (3)

xvge ' I /-ISee Attached ListingGentlemen:SUBJECT: MODIFICATION OF VACUUM BREAKERS ON MARK I CONTAINMENTS(GENERIC LETTER 83-08 )In the latter stages of the generic resolution of the Mark I ContainmentLong-Term Program suppression pool dynamic load definition, a potentialfailure mode of the vacuum breakers (connecting the ring header insidethe torus to the drywell) in the chugging and condensation oscillationphases of blowdown to the torus during a LOCA was identified. In the"Mark I Containment Program Full-Scale Test Program Final Report" (NEDE-24539-P) it was reported that during the first full-scale test (Ml),which had the highest initial vacuum breaker opening pressure, damage tothe vacuum breaker pallet hinge and latching magnet occurred. In subsequenttests run at a lower opening pressure, with the vacuum breaker strengthened,damage was limited to the pallet sealing gasket which did not affectoperability.At the time this-was discovered, the generic phase of the Mark I Con-tainment Long-Term Program was nearing completion; however, the Mark IOwners Group did commit to resolve this issue. Two vacuum breaker ownergroups were formed, one for those with Atwood Morrill vacuum breakersthat *is. using MPR as consultants, and one for those with GPE vacuumbreakers that is. using NUTECH as consultants. It is our understanding,based on a September 10, 1982 meeting with General Electric and the MarkI Owners Group, this effort has been completed and the results have beenapplied to obtain plant specific resolutions.Although this issue was not included within the scope of the Mark IContainment Long-Term Program as identified in NUREG-0661, these vacuumbreakers provide protection to maintain containment integrity and, assuch, are subject to staff review. Therefore, we request that within 30days of receipt of this letter you provide a commitment to submit theresults of the plant unique calculations which either formed the basesfor modifications to the vacuum breakers or provide the justificationfor their as-built acceptability. Schedules for completion of anymodifications should also be included in your response.N-It is suggested, if possible, that the resolution of this issue besubmitted with the Mark I Long-Term Program -Plant Unique AnalysisReport for post-implementation review.This request for information was approved by the Office of Managementand Budget under Clearance Number 3150-0091 which expires October 31,1985.Sincerely,tvpj-' L I C8302030089 Darrell G. Eisenhut, Director_ ~ ,vision of Lic,0sin&4,, beldtlDLnOfl2 DLW , D L:RB#2 ...AD:SURNAME. ......1X ...... .- ....... ........................ .-............DATE ... M1 ...= ........ )VIUSA.1.... .i'. t-t-soW.R.Vew rU Es ut100U ,IOPYA2 _,144razz run -l %.ut ...... Ecu__ __ ____ __ _. X -_. , __ , I /'Ir __ , I IV , __

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