ML18046A613

Proposed Revisions to Tech Spec Tables 1 & 2 Re Steam Generator Insp

ML18046A613
Person / Time
Site:	Palisades
Issue date:	05/05/1981
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18046A611	List: ML18046A610 ML18046A612 ML18046A613
References
NUDOCS 8105080192
Download: ML18046A613 (2)

Text

TABLE 1 Summary Comparison of Current and Proposed Tech Spec Requirements (Section 4.14) Requirement ET Inspection Frequency Maximum period for reinspection of unplugged tubes with ET indications greater than or' equal to 30% Inspection sample for unplugged tubes containing ET indications equal to or greater than 45% using ET techniques qualified for producing interpretable results Inspection sample for unplugged tubes with ET indications greater than or equal to 30% but less than 45% Random sample using pull-through technique for tubes with ET indication less than 30% Operating allowance for multiple ET indications Operating allowance for ET indications other than multiple *ET indications Plugging criteria for denting Interval between completion of inspection and repair and sub-* mission of inspection report Current Tech Spec Every 12-24 months One inspection (Two is allowed if significant crease. in radiation exposure results) 100% 100% hot leg 1% cold leg 35% 6% for inspection after 1976 10% for tubes last inspected in 1976 20% for tubes last inspected in 1975 Failure to pass 0.540" probe 30 days 8 Proposed Tech Spec Every 12-24 months Three inspections 100% 33-1/3% NOTE: Chas.en so 100% tubes ted within three inspections 2% hot leg 1% cold leg 35% 6% Failure to pass 0.540" probe 90 days NOTE: Sleeve inspection frequency and acceptance criteria unchanged.

nu0481-0220b-43 s1 o s os o lt:ta

• TABLE 2 Effect on Tubes To Be Inspected of Revised Technical Specifications 9 (Based on Latest Inspection Results From 1979) Inspection Sample Number of unplugged tubes/ indications with previous ET results equal to or greater than 45% to be inspected Number/percent of unplugged ET indications equal to or greater than 45% which are expected to be given interpretable inspection Number of unplugged tubes/ indications with ET results equal to'or greater than 30% but less than 45% to

• be inspected Number/percent of unplugged ET indications equal to or greater than 30% but less than 45% which are expected to be given an interpretable inspection Tubes included in random sample nu0481-0220c-43 Current Tech Spec SG-A SG-B 283/296 214/247 296/100% . 247/100% (Using previous ET techniques) 987/1601 720/1251 1102/68.8%

716/57.2% (Using previous ET techniques) 132 hot leg 136 hot leg 53 cold leg 69 cold leg Proposed Tech Spec SG-A SG-B 283/296 214/247 296/100% 247/100% (Using new ET techniques) 329/534 240/417 (1/3 (1/3 sample) sample) >'<534/ 100% *417/100% (Using new techniques)

• 1601 over 3 tions *1251 over 3 tions 132 hot leg 136 hot leg 53 cold leg 69 cold leg