ML20148Q427
| ML20148Q427 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/22/1988 |
| From: | Johnson I COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| 4136K, GL-84-11, NUDOCS 8802010082 | |
| Download: ML20148Q427 (5) | |
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/^N Comm:nwealth Edi;on l
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/ One First NT.tional Plaza, Chicago, Illincis
\\C Address Repfy to: Post Office Box 767 I
Chicago, Illinois 60690 0767 i
January 22, 1988
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Mr. Thomas B. Murley, Director Office of Nuclear. Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Quad Cities Station Unit 2 Submittal of Inspection Plan for Piping Suscept.ible to Intergranular Stress Corrosion Cracking (IGSCC) for the Upcoming Spring 1988 Unit 2 Refueling Outage.
NRC Docket No. 50-265 References (a): Generic Letter 84-11 dated April 19, 1984 Regarding Inspections of BWR Stainless Steel Piping (b):
Letter from R. Auluck to D.L. Farrar dated March 23, 1987
Dear Mr. Murley:
Reference (a) provides the requirements for inspections to be performed at BWR facilities for piping that is susceptible to Intergranular Stress Corrosion Cracking (IGSCC). This transmittal provides the IGSCC inspection plan for the Spring 1988 Quad Cities Unit 2 outage in accordance with the requirements of Generic Letter 84-11.
The transmittal also takes into account the items which we were required to address as a result of your most recent Unit 2 Safety Evaluation (Reference (b)). To facilitate final l
outage planning, we request your preliminary concurrence within 30 days of the receipt of this letter.
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T. E. Murley January 22, 1988 Please direct any questions you may have regarding this matter to this office.
Very truly yours, l
I. M. Johns Nuclear Licensing A istrator im Attachment cc:
T. Ross - NRR NRC Resident Inspector - Quad Cities l
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l 4136K i
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1 Quad Cities Unit Two Plan for IGSCC Related Activities Spring 1988 During the Fall 1983 refueling outage, Induction Heat Stress Improvement (IHSI) was performed on approximately 100 IGSCC susceptible welds (77 recirculation welds,10 RHR Welds, and 13 RWCU welds).
Concideration is being given to the performance of the Mechanical Stress Improvement Process (MSIP) on additional high temperature stainless steel welds during this outage.
1.
The accompanying table titled "Augmented Stainless Steel Weld Inspection Plan-Spring 1988-Quad Cities Unit Two" provides the sampling plan for addressing Intergranular Stress Corrosion Cracking (IGSCC) concerns. The plan follows the requirements of Generic Letter 84-11.
It also addresses the requirements of the Safety Evaluation (SER) dated March 23, 1987 for Quad Cities Nuclear Power Station, Unit 2.
2.
The proposed inspection plan includes ultrasonic examination of 26 non IHSI and previously examined welds, 33 IHSI and previously examined welds, 7 welds with known flaws, and 14 overlaid welds.
Additional welds will be examined af ter the application of MSIP.
3.
IGSCC susceptible weld examinations will be performed by Level II or III inspectors qualified by EPRI af ter September 10, 1985.
Examination of overlaid welds will be performed by Level II or III inspectors qualified by EPRI to inspect overlaid welds using the EPRI developed technique.
Automated ultrasonic testing technique may be employed.
4.
If IGSCC flaw indications are identified, they will be resolved consistent with the intent of Generic Letter 84-11.
If repairs are required, weld overlays may be utilized which take into account flaw characterization, depth, length, ard material toughness.
5.
If flaw is found within the first inspection sample of a specific piping category, another equivalent sample of the same number of welds in that category will be inspected.
If flaw is found within the second inspection samplo of a specific piping category, the remaining accessible welds in that category will be examined.
(
Categories are defined by the horizontal lines on the attached table.
The Noz-SE welds (12" and 28") in the Recirculation system are considered a separate category from the susceptible piping welds for the purpose of sample expansion.
These welds have a corrosion resistant cladding on the ID over the weld and adjacent heat I
i affected zones.
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, _. - 6.
SER requirements addressed by the ' plan.
a.
Approximately 50% of the uncracked IHSI treated welds will be reinspected during this outage.
(SER Item 1) b.
Recirculation welds 02BS-S12 and 02BS-F14 will be reinspected
-during this outage.
(SER Item 2) c.
Overlaid weld 02A-S10 will be reinspected this outage using the EPRI developed technique (automated UT technique may be utilized).
Depending on the examination results, appropriate corrective action (s) will be implemented.
(SER Item 3) i i
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. AUGENTED STAINLESS STEEL-nELD INSPECTION PLAN SPRING 199B QUAD CITIES UNIT TWO Not Non 1988 84-11 & SER Saple Prev.
Prev.
Cracked Not Prev. Ex a.
Size Total Exm.
Exm.
IHSI'd W.0.L Prev. Ex m Non IHSI'd IHSI'd Welds W.0.L (Not (A)
Acces-sible)
Recirculation Outlets 28" 30 0
30 19 6-0 0
10(C) + 5(D) -
6 Noz-SE 28" 2
0 2
0 0
0 1
0 0
Header 22" 22 0
22 4
2 0
2 2
2(E)
Risers 12" 44 0
44 32 10 0
0 16 + 2(D) 5 Noz-SE I?"
10 0
10 0
0 0
2 0
0 e
RHR 50C 20" 18 2
16 2
2 0
2 1
1 LPCI 16" 32 3
29 6
0 0
3 3
0 Core Spray 10 27 2
25 0
0 0
5 0
0 Jet Pup Inst 12",
10 0
10 0
0 0
2 0
0 i
8",
4" Recire, H.S.
6" 13 3
10 1
0 0
2 1
0 l
HV, CRO,HWCU 4*
34 1
33 0
0:
0 7
0 0
7(D) 14 0
26 33 +
Total welds to be inspected - 0 + 26 + 33 + 7 + 14 - 80 Note: (A) Includes flawed welds.
l (B) Includes 50% of INSI'd welds to address SER requirement (SER dated Narch 23, 1987).
I (C) Includes two 28" Recirculation welds: 0285-512 and 0285-F14.
l (D) Unrepaired cracked welds.
(E) Includes overlay weld 02A-510.
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