ML19208D157
| ML19208D157 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/30/1979 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Keepler J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| NUDOCS 7909280057 | |
| Download: ML19208D157 (4) | |
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._ n Cw.su=ers Fever Ccepany provided you our Jehedule 'cr cc=pletien of II Sulletin 79-13 in a letter dated July 13, 1979 This schedule is still accurate. Hevever, having revieved the bulletin in depth, ve conclude that certain of the inspections are unnecessary.
'4e intend to cceply with the varicus ite=s in the bulletin as follows:
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10 CFR 50 55a to incorporate the 77S78 Addenda.
Censu=er, Feve r Cc=pany u-i-lices hole type reflectors (increasing sensitivity by a facter of two) and 0
three angles (Oc, h3 and 60 ), whereas the Ccde requires only two angles, all 0
of which provide a high degree of assurance that any relevant indicatien is located and evaluated.
Section III UT acceptance criteria is patterned after Section III RT acceptance criteria and is based solely en the length of the indication (ie,1/k" for t < 3/k").
Section XI UT acceptance criteria was established specifically for UT and was based on a very censervative fracture =echanics approach.
Section XI, ThS75, acceptance criteria (r4S-351h) rejects based both en length (ie, 0.1" to 0.h" for t = 3/4") and depth (2.6", - 7.2", of vall thickness) of the indication.
The Section XI acceptance criteria effectively brackets the acceptance criteria of Section III and the finite differences between the two acceptance criteria is within the limit of the NDE operator's ability to measure lengths, ie, 0.1".
The principal dimension with which we are concerned is the depth of the indicatica (which only Section XI treats) and which can be =easured =uch =cre accurately en the display screen (CRT) of the UT instrument, ie, 0.05", than can the length.
Therefore,Section XI acceptance criteria vill be used.
Ite: 1(b)
If cracking is noted during the ex 4-atica of the feed-water piping-te-safe end veld or the safe end-to-ncznle veld, the folleving velds vill be exa=ined.
(See Dvg S-25, ISI Master Plcn attached.)
74S-16-D L lS1-259 745-18-n L IS1-260
'745-18-74L-2S1-260 74S-18-D L 2S1-261 These velds ccustitute a the veld.s between the feed-water ncc le and the first pipe suppcrt.
~te: 1(c)
The folleving piping supper: ec=penents inside centain=ent vill be exa=ined to veri _^y cperability and confer-a-ce te design.
(See Dvg 3-25, ISI Maste T " )
Eancers Snubbers Lums Saddle Sunner s T45-13-74L-lS1-2hSFR Ucce T45-18-74L-1Si-256?L 1 h MTS-15-ni-lSl-2h5?R 74S-18-TiL-lS1-251?R 745-16-A L 2Sl-25 ?L 1 L T45-18-Al-lS1-251?R Ta*S-IS-74L-lSi-252?R tis-13-BLISl-252??
tis-13-74L-lSi-256?R tis-IS-DiL-1Sl-253?E-1 tis-18-ALIS1-25SPR-1 T45-13-31-1S1-259?R-2 TIS-18-WLIS1-258?R-2 T45-18-74L-2S;-2h9?R T45-13-DI-251-2L9?R T45-le-B L 2Sl-252?R tis-13-TiL-251-252??
TIS-15-74L-2Sl-253?R tis D -2S1-253??
B*S-13-DI-251-257?R A*S-13-Ti;-251-259?E-1 T45-15-D L 2Si-259?R -
- c 3-Til-251-259?R-2 tis-19-Til-2Sl-259?R-2 f
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1051 224
3 These supports constitute aD of the feed-water systes piping supports and snubbers in contain=ent.
Ite= 2(a)
The Palisades Plant uses a ec - n feed-water line/ feed-water no::le for both
=ain feed-water and anrniary feed-vater inside contain=ent. A volu=etric exa=ination (UT) vill be perfor=ed on each auxiliary feed-vater-to-=ain feed-vater pipe branch connection outside contai;=ent. The perfor=ance of 3DE exami-naticas on the no::le and safe end welds vill be in accordance with 1(a) above.
Additional exa=inations conducted 7ursuant to finding Code rejectable indica-tiens vill be in accordance with 1(b) above. No NDE vill be perfor=ed on the re=ainder of the feed-water lines within contain=ent with the exception of these currently scheduled in the ISI M'istar Plan, unless IWC-2430 is applicable.
The NDE performed purst.mt to 1(a),1(b) (if necessa:f),1(c), and 2(a) above, which vill be cond'teted in lieu of the exa=ination of every piping veld en the feed-water line in contain=ent. provides a high degree of assurance that defects existing in hi8hly stressed feed-water velds are detected.
The feed-vater no::le velds and the auxiliarf feed-vate.r-to-cain feed-vater branch unnectica are postulated to be a=cns the highest stressed ec=penents in the feed-vater lines due to the rigid constraint i= posed by the stea= generator and ther- gradients resulting frc= feedvater at 390 F flowing into the stes= generator (s) at 550 F and h0 F auxiliary feedvater fleving into 390 F =ain feedvater. The perfor-= ce of NDE on the abcve cited ec=penents effectively canvasses these areas = cst susceptible to stress induced failure and as such adequately =ccitors the integrity of the Palisades feed-water lines.
Ites 2(b)
Ite= not applicable to Palisades Plant.
Ite: 2(c)
Perfor=ed as stated in 1(c) above.
Ite= 3 Ite= not applicable to Falisades Plant.
Ite= h An7 cracking or other Code rejectable defect vill be reported Oc the NEC Regional Office within 2h hours of identificatien.
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h Item 6 The results of these exa=inations vill be reported in the ISI Final Report 90 days after the last ISI exanination since all Code rejectable defects will be reported within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
David P Eof.~an (Signed)
David P Hoffean Assistant Nuclear Licensing Administrator CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement O
1 1051224
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