ML20235D041

Requests Clarification on Interpretation of Tech Specs Re Primary Containment Allowable Leakage Rates

ML20235D041
Person / Time
Site:	Dresden, 05000000
Issue date:	08/30/1983
From:	Tongue T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Walker R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML16342B348	List: IA-87-121, Discusses Inservice Test Programs Re Full Stroke Exercising of Normally Closed Swing or Tilting Disk Check Valves Per 10CFR50.55a & Section XI of ASME Code ML20235B266 ML20235B268 ML20235B295 ML20235B304 ML20235B322 ML20235B406 ML20235B470 ML20235B514 ML20235B581 ML20235B613 ML20235B673 ML20235B768 ML20235B785 ML20235B799 ML20235B859 ML20235B877 ML20235B922 ML20235C007 ML20235C967 ML20235C970 ML20235D014 ML20235D041 ML20235D091 ML20235D157 ML20235D188 ML20235D233 ML20235D400 ML20235D433 ML20235D484 ML20235D532 ML20244B491 ML20244B568 ML20244B571 ML20244B913 ML20244B937 ML20244B941 ML20244B943 ML20244C126 ML20244C271 ML20244C361 ML20244C777 ML20244C785 ML20244C833 ML20244C935 ML20244C940 ML20244C986 ML20244D413 ML20244D552 ML20244D582 ... further results
References
FOIA-87-121 NUDOCS 8707100033
Download: ML20235D041 (1)

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'h a...+[ GLEN E LLYN lLLINois 60137 August 30, 1983 M,EMORANDUM FOR: R. D. Walker, Chief, DPRP Section 2C FROM: T. M. Tongue, SRI, Dresden

SUBJECT:

Interpretation of Technical Specifications - Primary Containment Allowable Leakage Rates Recently, questions have been raised concerning the correct interpretation of Dresden Technical Specifications concerning primary containment maximum allowable leakage rates. The incident that promulgated this had to do with the discovery on August 11, 1983, of several arc strikes that penetrated certain corrugated expansion bellows located in piping connecting the torus to the drywell on Unit 2. These penetrations constituted a breach of primary containment and as such, the licensee went to cold shutdown and performed the required repairs. As part of the analysis done the licensee calculated the combined leakage rate at accident pressure for all the holes to be 6.43 scfm. By summing this number with the results from the last integrated leak rate test (4.94 sefm), the total Leakage rate was determined to be 11.37 scfm at accident pressure. This value fell into the interval between the 0.75 La and La limit. (La equals 1.6 percent by weight of the contain- p ment air per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at 48 psig and is equivalent to 13.7 scfm at Dresden.) h W

The licensee's interprets La to be the maximum allowable primary contain- bl -

ment leakage rate with 0.75 La being the maximum allowable limit only [

during a Type A test (integrated leak rate test). Dresden Technical "i Specifications do not address this topic in a clear manner, and because M of this, some confusion exists as to what is the maximum allowable primary i.

containment Leakage lirt.it dur-ing plant operation. Is La considered the .E operational limit es the licensee interprets it to be? Or does the more .k restrictive value of 0.75 La hold as the operational Limit?

Any assistance y N can give us in this matter is appreciated. 5:

I in if T. M.

SRI, Dresden NPS 0 a

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9707100033 870701 PDR FOIA WILLIAN87-121 PDR

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