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

8 TABLE 1 Summary Comparison of Current and Proposed Tech Spec Requirements (Section 4.14)

Requirement Current Tech Spec Proposed Tech Spec ET Inspection Frequency Every 12-24 months Every 12-24 months Maximum period for reinspection One inspection Three inspections of unplugged tubes with ET (Two is allowed if indications greater than significant in-or' equal to 30% crease. in radiation exposure results)

Inspection sample for unplugged 100% 100%

tubes containing ET indications equal to or greater than 45% using ET techniques qualified for producing interpretable results Inspection sample for unplugged 100% 33-1/3%

tubes with ET indications greater NOTE: Chas.en so than or equal to 30% but less than 100% tubes inspec-45% ted within three inspections Random sample using pull-through 2~~ hot leg 2% hot leg technique for tubes with ET 1% cold leg 1% cold leg indication less than 30%

Operating allowance for multiple 35% 35%

ET indications Operating allowance for ET 6% for inspection 6%

indications other than multiple after 1976

• ET indications 10% for tubes last inspected in 1976 20% for tubes last inspected in 1975 Plugging criteria for denting Failure to pass Failure to pass 0.540" probe 0.540" probe Interval between completion of 30 days 90 days inspection and repair and sub-

• mission of inspection report NOTE: Sleeve inspection frequency and acceptance criteria unchanged.

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

• 9 TABLE 2 Effect on Tubes To Be Inspected of Revised Technical Specifications (Based on Latest Inspection Results From 1979)

Inspection Sample Current Tech Spec Proposed Tech Spec SG-A SG-B SG-A SG-B Number of unplugged tubes/ 283/296 214/247 283/296 214/247 indications with previous ET results equal to or greater than 45% to be inspected Number/percent of unplugged 296/100% . 247/100% 296/100% 247/100%

ET indications equal to or greater than 45% which (Using previous ET (Using new ET are expected to be given techniques) techniques) interpretable inspection Number of unplugged tubes/ 987/1601 720/1251 329/534 240/417 indications with ET results equal to'or greater than (1/3 (1/3 30% but less than 45% to

• sample) sample) be inspected Number/percent of unplugged 1102/68.8% 716/57.2% >'<534/ 100% *417/100%

ET indications equal to or greater than 30% but less (Using previous ET (Using new techniques) than 45% which are expected techniques) to be given an interpretable *1601 over *1251 over inspection 3 inspec- 3 inspec-tions tions Tubes included in random 132 hot leg 136 hot leg 132 hot leg 136 hot leg sample 53 cold leg 69 cold leg 53 cold leg 69 cold leg nu0481-0220c-43