ML19340E488

Separate Accompanying Summary Rept of Type B & C Events Since June 1977 Type a Test

ML19340E488
Person / Time
Site:	Yankee Rowe
Issue date:	09/30/1980
From:	Autio H, Henderson T, Warner B YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML19340E482	List: 05000029/LER-1977-044, Forwards LER 77-044/03L-0 05000029/LER-1977-044-03, /03L-0:on 770817,observed That Leakage of Valves TV-211 & TV-408 Greater than Acceptable Limits.Caused by Worn Seat & Disc & Deteriorated Diaphragm,Respectively. Valve Seat & Disc Machined & Diaphragm Replaced ML19340E481 ML19340E488
References
NUDOCS 8101140678
Download: ML19340E488 (3)

Text

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SEPARATE ACCOMPANYING

SUMMARY

REPORT OF TYPE "B" AND "C" EVENTS SINCE THE JUNE 1977 TYPE "A" TEST SEPTEMBER 1980 YANKEE ATOMIC ELECTRIC COMPANY R0WE, MASSACHUSETTS 01346 1.

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Page 1 In the interval between the June 1977 Type "A" test and the September 1980 Type "A" test, all Type "B" and "C" vapor container penetration barriers subject to testing under Appendix J to 10 CFR 50 were tested at accident pressure on a two year basis (vapor container personnel hatch on a six month basis).

During that time, eight Type "C" failures occurred.

In addition, two Type "C" test periods exceeded the 24-month maximum allowed.

All ten evsnts were reported at the time and are summarized in Table 1.

Copies of the Licensee Event Reports are also attached.

There were no events concerning Type "B" tests during the interval.

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TABLE 1

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TYPE "C" TEST EVENTS, JUNE 1977 to SEPTEMBER 1980 LER #

SYSTEli BARRIER DISPOSITION 77-44 VC Pressure Sensing / Service Water TV-211/TV-408 TV-211: Underwent seat and disc machining TV-408: Diaphragm replaced 78-010 Post Accident flydrogen Vent IIV-SOV-1 Cleaned internals; replaced rubber seal

.78-034 Neutron Shield Tank Sample TV-207 Cycled under pressure 79-05 Service Water TV-408 Valve seat cleaned 79-14 Post Accident liydrogen Vent CA-V-688 Cleaned internals 79-27 Post Accident !!ydrogen Vent IIV-SOV-1 & 2 Cleaned internals 79-29 Post Accident !!ydrogen Vent IIV-SOV-1 & 2 Cleaned internals 80-13 Steam Generator Blowdown TV-401D Foreign material removed 78-09 Post Accident flydrogen Vent llV-SOV-1 & 2 Missed surveillance rerformed 79-20 Main Coolant Drain VD-TV-202 Missed surveillance performed 9

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