ML20106D209
| ML20106D209 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/19/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-4-171, NUDOCS 8410250042 | |
| Download: ML20106D209 (4) | |
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'Ai5 Duquesne Udit 2Ng J (412)923-1960 Nuclear Construction Division Telecopy (412) 787-2629 Robinson Plaza, Building 2. Suite 210 Pittsburgh, PA 15205 October 19, 1984 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:. Mr. George W. Knighton, Chie f Licensing Branch 3 Of fice of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Pr service Inspect ion Program - Use of Portions of Later e
Addenda of ASME Section XI Examination of Class 2 Systems Gentlemen:
The Duquesne Light Company (DLC) Preservice Ins pect. ion Program Submittal, letter 2NRC-4-096, dated June 29, 1984, was based upon the ASME Boiler and Pressure Vessel Code, 1980 Edition through Winter 1980 Addenda and an applicable portion of 1974 Edition, Summer 1975 Addenda for Class 2 piping weld examination (per 10CFR50.55a[b][2][iv]).
bLC now requests Nuc lear Regulatory Commission's approval to use paragraphs IWC-1221 and IWC-1222 of SubSubArticle IWC-1220 and Table IWC-2500-1, Examination Categories C-F-1 and C-F-2 from the 1983 Edition, Winter 1983 Addenda (W83) of the ASME Boiler and Pressure Vessel Code,Section XI.
The requirements will oe used for selection and examination of Class.2 piping welds for the Beaver Valley Power Station - Unit No. 2 Preservice Inspection Program and for compatability with expected Inservice Inspection Program requirements.
As the W33 Addenda has not yet been referenced in 100FR50.55a(b) as an' approved Code, specific NRC approval is required to allow use of the W83 Addenda in accordance with 10CFR50.55a(g).
Although the above SubSubArticle Paragraphs and Tables of the ASME Section XI (W83) have been incorporated into a Code Case (N-408), this Code Cass has not been included in NRC Regulatory Guide 1.147.
DLC prefers direct invocation of the W83 Addenda, in lieu of the Code Case, to provide better compatibility with expected ISI program requirenents.
The W83 Addendum dif fers from the W80 Addendum in the following significant aspects:
Y 1.
The volumetric examination population of all > 4" size piping non-exempt welds increases for piping with wall thickness 3/8" through 1/2", wh ere previously only surface examination was required.
1 8410250042 841019 POR ADOCK 05000412 q
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l Unitzd Stcteo Nuclect Rsgulctory Commissio'n i
Mr. Gscrg2 W.~ Knighton; *Chisf
,Page"2
~2.
Volumetric and' surf ace examination of 2" through 4" size piping
' welds is added for high pressure safety injection piping, thus increa~ sing the population of non-exempt welds.
-3.
The 5383. Addenda ' essentially. supersedes 10CFR50.55a(b)(2)(iv),
for. Class 2 pipe welds in Re s idual Heat ' Removal ' Systems, Emergency Core Cooling Sys tems,. and Containment Heat Removal Systems, such that' WB3 -is utilized in lieu of. 74S75 and results in i a reduction of surf ace examination requirements for piping
. welds > 4" with wall thickness less than 3/8".
4.- The Se'lection Criteria.is based on a larger population of welds requiring volumetric examination, in which a smaller percentage has been applied (W83), resulting in an anticipated larger total ' number of welds requiring volume tric examination than would be required by 80W80.
5.
Compatibility ' between PSI. baseline and expected ISI require-ments will'be better established.
' Table s
- 1. and II a ttached are provided as "Information Only" and
.~ have' been developed from a detailed estimate of the' Class 2 piping weld population utilizing' piping weld lists, isometrics,' and flow diagrams applicable to these systems.
Your prompt approval' is requested to allow timely implementation of
~
this : aspect (Class 2, Piping Welds) of. the BVPS-2 ' PSI Program,. as well as provide compatibility with the ISI Program preparation (scheduled for June, g
1985,- submittal).
DUQUESNE. LIGHT COMPANY By i '
E.(f.%oleve r Vice President JJS/wjs-
- Attachments
.cc:
Ms. M. Ley, NRC (w/a)
Mr. E. A Licitra, NRC (w/a)
Mr. M. Hum, NRC (w/a)
Mr. ' B. Brown, EG6G (w/a)
L
-lFOR'INFORMATION ONLY'-:,
TABLE."1~
CARBON STEEL (TABLE IWC-2500-1, CAT C-F-2)'
ESTIMATE OF CLASS 2 PIPING WELD POPULATION System 80W80 83W83 83W83 vs. 80W80 (change)
Vol.
Surf Vol.
Surf Vol.
Surf RHR' 4
310*
69 69
+ 65
-241**-
4 CHR:
RSS 0
413*
132 132
+132
-281***-
QSS 0
15*
3 3
+ 3
- 12**
ECC:
SIS 172 610*
278 278
+106
-332**
CHS 0
118*
43 43
+ 43
- 75**
s TOTAL 176 1466*
525 525
+349
-941***
i Surf ace Examination for > 4" size piping with wall thickness 1/2" or less Decrease in Surf ace Examination is for > 4" size piping with wall thickness < 3/8" per W83
- Decrease in Surf ace Examination is for > 4" size piping with wall thickness.< 3/8" or for piping beyond the l
containment isolation valve in open ended systems which do not contain water during normal plant operations per W83
.j
- FOR INFORMATION ONLY -
-TABLE II CARBON. STEEL. (TABLE IWC-2500-1, CAT C-F-2)
ESTIMATE OF CLASS 2 PIPING'. WELD POPULATION System 80W80 83W83 83W83 vs. 80W80 (change)
Vol.
Surf Vol.
Surf Vol.
Surf 4
-SVS(MSS) 0 55-55 55
+ 55 0
MSS 91 96 96 96
+
5-0-
S FWS 49 49 49 49 0
0 TOTALS 140 200*
200 200
+ 60 0
- Surf ace examination for > 4" size piping with wall thickness 1/2" or less