ML20093C172
| ML20093C172 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 10/09/1984 |
| From: | Cutter A CAROLINA POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| GL-84-11, NLS-84-436, NUDOCS 8410100388 | |
| Download: ML20093C172 (9) | |
Text
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, L Cp&L Carolina Power & Light Company SERIAL:
NLS-84-436 OCT 0 91984 Mr. Darrell G. Eisenhut, Director Division of Licensing
'~
-United States Nuclear. Regulatory Commission
. Washington, DC.
20555 BRUNSWICK STEAM ELECTRIC PLANT,. UNIT NO. I
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, DOCKET NO. 50-325/ LICENSE NO. DPR-71 SUPPLEMENTAL RESPONSE TO GENERIC LETTER 84-11 INSPECTIONS OF BWR STAINLESS STEEL PIPE
Dear Mr. Eisenhut:
A.:
SUMMARY
~By letter dated June 1,1984 (Serial No. NLS-84-222), Carolina Power & Light
- Company- (CP&L) responded to NRC Generic Letter 84-11 by providing our - plans for performing inspections for intergranular stress corrosion cracking (IGSCC) on Brunswick Unit Nos. I and 2.
The June 1, 1984 response referenced our letters of January 31,1984 (Serial No. NLS-84-045) anl February 27, 1984
-(Serial 'No. NLS-84-081) for the scope aal schedule of planned Brunswick-2 inspections. The purpose of this letter is to apprise you of the Company's
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1atest piens for performing inspections for IGSCC during the upcoming
, Brunswick-1 outage, scheduled to begin on or before November 2, 1984.
DISCUSSION In Generic Letter 84-11, the NRC staff stated that an acceptable response to the current IGSCC issue would be to initiate a re-inspection program of piping
. susceptible to IGSCC ami to commence re-inspection within approximately two calendar-years, adjusted to coincide with the next scheduled outage. In addition, Generic I4tter 84-11 also provides criteria for performing future re-inspections.
'Our January 31, 1984 ami February 27,.1984 letters provide our plan 'to inspect 37 welds for possible IGSCC on Brunswick-1 during the upcoming November 1984 outage. Since the -submittal of those inspection plans and the issuance of
-Generic Letter 84-11, CP&L has continual to assess possible pipe replacement versus future inspection of the existing piping. Based on our unterstamling of the technical criteria in Generic Letter 84-11, the Company has elected not
- to replace the Brunswick-1 piping during the March 1985 outage unless scostantial defects are detected.
During the upcoming Brunswick-1 outage, scheduled to occur on or before
' November 2, 1984, the welds listed in Table 1 (enclosed) will be inspected.
This inspection will include 100% of the welds not previously inspected. ASME Class I non-conforming stainless steel weld joints that are four inches or
' greater (except those that have been repaired by weld overlays) are inclated in the table.
411 Fayettevine Street
- P. O. Box 15$1
- Raleign. N. C. 21602 g
4 8410100308 841009 PDR ADOCK 05000325
- e PDR
D. G. Eisenhut The performance capability of Level 2 and Level 3 UT examiners performing evaluations will be demonstrated in accordance with IE Bulletin 83-02.
Level 1, 2, or 3 UT examiners performing operations other than evaluations (general scanning observations and discrete signal interpretation) will be required to demonstrate their field performance capability.
Examiners performing evaluations will be able to view the CRT display for the entire time that the transducer is in contact with the pipe for scanning, either in real time, remotely, or on tape recordings.
Examiners that perform final crack sizing measurements vill have completed the EPRI crack sizing course.
In addition to the welds in Table 1, the inconel nozzle butter of the safe-end to welds identified in Table 2 (enclosed) will also be inspected during the November 1984 outage. This is in accordance with the recommendations of IE Notice 84-41.
The remaining inconel butter of the safe-end to nozzle welds identified in Table 3 (enclosed) will be inspected during the next Brunswick-1 refueling outage (Reload 5) presently scheduled to begin on or before tarch 30, 1985.
The welds identified in Table 4 (enclosed) that have weld overlays will be inspected during the next Brunswick-1 refueling outage (Reload 5).
Welds that are found to be cracked and are not repaired during the November 1984 outage will also be re-inspected and re-evaluated during the liarch 1985 outage.
As stated in our June 1,1984 response to Generic Letter 84-11, the following special surveillauc2 measures have been implemented at the Brunswick Plant:
1.
Plant shutdown shall be initiated for inspection, and corrective action shall be taken, when any leakage detection system indicates, within any period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, an increase in the rate of unidentified leakage in excess of 2 gpm or its equivalent, whichever occurs first.
For sump level monitoring systems with fixed-measurement interval method, the level shall be monitored at 4-hour intervals or less.
2.
At least one of the leakage measurement instruments associated with each sump shall be operable, and the outage time for inoperable instruments shall be limited to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or an orderly shutdown will be immediately initiated.
3.
A visual examination for leakage of the reactor coolant piping shall be performed during each plant outage in which the containment is deinerted. The examination shall be performed consistent with the requirements of IWA-5241 and IWA-5242 of the 1980 Edition of Section XI of the ASME Boiler and Pressure Vessel Code. The system boundary subject to this examination shall contain the susceptible welds inside the primary containment.
These special surveillance measures are consistent with those given in Attachment I to Generic Letter 84-11 and with CP&L's ALARA program.
Based on the criteria given in Generic Letter 84-11 for re-inspecting piping susceptible to IGSCC, the next Brunswick-1 inspection following the !! arch 1985 outage inspections will be scheduled for the Reload 6 outage for Brunswick-1.
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D.. G. Eicca. hut F The' Company is continuing to assess various long-term countermeasures,
- including hydrogen water chemistry, IHSI, and pipe replacement. We will also continue to support and monitor irmlustry efforts to improve ultra.?onic inspection techniques.
Should you have any questions concerning this matter, please contact Mr. Sherwood R. Zimmerman at (919) 836-6242.
-Yours very tr q&
A. B. Cutter - Vice esident Nuclear Engineering & Licensing MAT /ccc ( 700llAT)
Enclosurea ec:
Mr. ' D. O. Myers (NRC-BNP)
Mr. J. P. O'Reilly (NRC-RII)
Mr. M. Grotenhuis (NRC)
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't TABI.E 1 Welds to be Inspected During November 1984 Outage 1-4 32-RECIRC-28"-A--2 Safe-eni to Pipe 1-532-RECIRC-28"-A-3 Pipe to 2.lbow 1-B32-RECIRC-28"-A Cibow to Pipe 1-B 32-RECIRC-28 "-A-5 Pipe to Tee l'832-RECIRC-28"-A-6 Tee to Pipe 1-B32-RECIRC-28"-A-7 Pipe to Elbow
.1-B32-RECIRC-28"-A-8 Elbow to Valve
.1-B32-RECIRC-28"-A-9 Valve to Pipe 1-B 32-RECIRC-28 "-A-9BC Branch Conneetion
.1-B32-RECIRC-28"-A-10 Pipe to Elbow 1-B 32-RECIRC-28 "-A-11 Elbow to Pump
.1-B32-RECIRC-28"-A-12 Pump to Pipe 1-B32-RECIRC-28"-A-12BC
. Pipe to Weld Olet 1-532-RECIRC-28"-A-13 Pipe to Valve 1-B 32-RECIRC-28"-A-15BC Weld Olet to Pipe L1-532-RECIRC-28"-A-16 Pipe to Tee 1-B32-RECIRC-28"-A-17 Tee to Cross 1-B32-RECIRC-28"-A Cross to Reducer 1-B 32-RECIRC-28"-B-2 Safe-emi to Pipe 1-8 32-REC 'RC-28 "-B-3
. Pipe to Elbow 1-B32-RECIRC-28"-B-4 Elbow to Pipe 1-B32-RECIRC-28"-B-5 Pipe to Tee 1-832-RECIRC-28 "-B-6 Tee to Pipe 1-532-RECIRC-28"-B-7 Pipe to Elbow i.
1-B 32-RECIRC-28 "-B-9 Valve-to Pipe 1-532-RECIRC-28 "-B-9BC Branch Conneetion 1-B 32-RECIRC-28 "-B-10 Pipe to Elbow
- 1-B 32-RECIRC-28 "-B-11 Elbow to Pump 1-4 32-RECIRC-28 "-B-12 Pump to Pipe 1-B 32-RECIRC-28"-B-12BC
. Pipe to Weld Olet
.1-B 32-RECIRC-28 "-B-13 Pipe to Valve L
1-532-RECIRC-28"-B-14 Valva to Elbow 1-8 32-RECIRC-28 "-B-15 Elbow to Pipe-1-532-RECIRC-28"-B-15BC Weld Olet to Pipe 1-B32-RECIRC-28"-B-16 Pipe to Tee 1-532-RECIRC-28 "-B-17 Tee to Cross 1-B 32-RECIRC-28 "-B-18 Cross to Reducer 1-532-RECIRC-22"-AM-1 Valve to Pipe 1-532-RECIRC-22"-AM-2 Pipe to. Valve 1-B32-RECIRC-22"-AM-3 Valve to. Pipe 1-B32-RECIRC-22"-AM-3BCA Pipe to Sweep Olet 1-B32-RECIRC-22"-AM-3BCn Pipe to Sweep Olet 1-432-RECIRC-22"-AM-4 Cross to Pipe
'l-532-RECIRC-22"-AM-5 Cross to Pipe 1-B32-RECIRC-22"-AM-5BCA Pipe to Sweep Olet 1-B32-RECIRC-22"-AM-5BCB Pipe to Sweep Olet 1-832-RECIRC-22"-AM-6 Pipe to Cap 1-532-RECIRC-22"-BM-1 Pipe to Cap i
.a
( 700 MAT /cfr)
1-B32-RECIRC-22"-BM-1BCA Pipe to Sweep Olet 1-B32-RECIRC-22"-BM-1BCB Pipe to Sweep Olet 1-B32-RECIRC-22"-BM-2 Cross to Pipe B32-RECIRC-22"-BM-3 Cross to Pipe 1-B32-RECIRC-22"-BM-3BC Pipe to Sweep Olet 1-832-RECIRC-22"-Ld-4 Pipe to Pipe 1-832-RECIRC-22"-BM-4BC Pipe to Sveep Olet 1-B32-RECIRC-22"-BM-5 Pipe to Valve l
1-B32-RECIRC-12"-AR-A-1 Sweep Olet to Pipe 1-B32-RECIRC-12"-AR-A-2 Pipe to Elbow 1-B32-RECIRC-12"-AR.-A-3 Elbow to Pipe 1-B32-RECIRC-12"-AR-A-4 Pipe to Extension 1-832-RECIRC-12"-AR-B-1 Sweep Olet to Pipe 1-832-RECIRC-12"-AR-B-2 Pipe to Elbow 1-B32-RECIRC-12"-AR-B-3 Elbow to Pipe l
1-B32-RECIRC-12"-AR-B-4 Pipe to Extension 1-B32-RECIRC-12"-AR-C-1 Sweep Olet to Pipe 1-B32-RECIRC-12"-AR-C-2 Pipe to Elbow 1-832-RECIRC-12"-AR-C-3 Elbow to Pipe 1-B32-RECIRC-12"-AR-C-4 Pipe to Extension 1-B32-RECIRC-12"-AR-D-1 Sweep Olet to Pipe 1-B 3 2-RECIRC-12"-AR-D-2 Pipe to Elbow 1-B3 2-RECIRC-12"-AR-D-3 Elbow to Pipe
[
1-B32-RECIRC-12"-AR-D-4 Pipe to Extension 1-B32-RECIRC-12"-AR-E-1 Sweep Olet to Pipe I
1-832-RECIRC-12"-AR-E-3 Elbow to Pipe 1-B32-RECIRC-12"-AR-E-4 Pipe to Extension 1-B32-RECIRC-12"-BR-F-1 Sweep Olet to Pipe 1-B3 2-RECIRC-12"-B R-F-2 Pipe to Elbow I
1-B32-RECIRC-12"-BR-F-3 Elbow to Pipe 1-B32-RECIRC-12"-BR-F-4 Pipe to Extension 1-B32-RECIRC-12"-BR-G-1 Sweep Olet to Pipe 1-83 2-REC IRC-12"-B R-G-2 Pipe to Elbow 1-832-RECIRC-12"-BR-G-3 Elbow to Pipe 1-B3 2-RECIRC-12"-B R-G-4 Pipe to Extension 1-B32-RECIRC-12"-BR-H-1 Sweep Olet to Pipe 1-B3 2-RECIRC-12"-B R-H-2 Pipe to Elbow 1-B32-RECIRC-12"-BR-H-3 Elbow to Pipe 1-B3 2-RECIRC-12"-B R-J-1 Sweep Olet to Pipe 1-B32-RECIRC-12"-BR-J-2 Pipe to Elbow 1-B3 2-RECIRC-12"-BR-J-3 Elbow to Pipe 1-B32-RECIRC-12"-BR-J-4 Pipe to Extension 1-B3 2-RECIRC-12"-B R-K-1 Sweep Olet to Pipe 1-83 2-RECIRC-12"-BR-K-2 Pipe to Elbow 1-B32-RECIRC-12"-BR-K-3 Elbow to Pipe 1-B32-RECIRC-12"-BR-K-4 Pipe to Extension 1-B32-RECIRC-4"-A-1 Sweep Olet to Pipe 1-B 32-RECIRC-4"-A-10 Pipe to Sweep Olet 1-B32-RECIRC-4"-B-1 Sweep Olet to Pipe 1-B32-RECIRC-4"-B-10 Pipe to Sweep Olet 1-Ell-RHR-24"-A-D1SCH-12**
Valve to Tee 1-E11-RHR-20"-A-SUCT-1 Tee to Pipe 1-E11-RHR-20"-A-SUCT-1 BC Branch Connection 1-E 11-RHR-20"- A-S' JCT-2 Pipe to Valve (700 MAT /cfr) c.
r 1-E11-RHR-24"-B-DISCH-13**
Valve to Cross 1-G31-RWCU-6"-SUCT-1 Tee to Pipe 1-G31-RWCU-6"-SUCT-2.
Pipe to Valve G31-RWCU-6"-SUCT-3 Valve to Pipe 1-G31-RWCU-6"-SUCT-4 Pipe to Elbow 1-031-RWCU-6"-SUCT-5 Elbow to Pipe 1-G31-RWCU-6"-SUCT-6 Pipe to Elbow 1-G31-RWCU-6"-SUCT-7 Elbow to Pipe 1-G31-RWCU-6"-SUCT-8 Pipe to Elbow 1-G31-RWCU-6"-SUCT-9 Elbow to Pipe 1-G31-RWCU-6"-SUCT-10 Pipe to *1 bow 1-G31-RWCU-6"-SUCT-11 Elbow to Pipe 1-G31-RWCU-6"-SUCT-12 Pipe to Valve 1-G31-RWCU-6"-SUCT-13 Valve to Pipe 1-G31-RWCU-6"-SUCT-14 Pipe to Elbow
.1-G31-RWCU-6"-SUCT-15 Elbow to Pipe 1-G31-RWCU-6"-SUCT-16 Pipe to Pipe 1-G31-RWCU-6"-SUCT-17 Pipe to ' Elbow 1-G31-RWCU-6"-SUCT-18 Elbow to Pipe 1-G31-RWCU-6"-SUCT-19 Pipe to Valve 1-G31-RWCU-4"-DISCH-2 Valve to Pipe 1-G31-RWCU-4"-DISCII Pipe to Valve
- Indicates Bimetallic
( 700 HAT /cf r)
TABLE,2 INCONEL N0ZZLE WELDS TO BE INSPECTED DURING NOVEMBER 1984 OUTAGE 1-B32-RECIRC-28"-A-1 Nozzle to Safe-end Inconel Buttering 1-B32-RECIRC-12"-AR-E-6 Nozzle to Safe-end Inconel Buttering 1-B32-RECIRC-12"-BR-J-6 Nozzle to Safe-end Inconel Buttering 1-B11-JPI-4"-N8A Nozzle to Safe-end Inconel Buttering s
r 1
(700 HAT /ccc)
h 3
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- l 6
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TABLE 3 f
INCONEL BUTTER WELDS TO BE INSPECTED
-DURING MARCH 1985 OUTAGE
- 1-532-RECIRC-28"-B-1 Nozzle to Safe-end Inconel Butter i
1-B32-RECIRC-12"-AR-A Nozzle to Safe-end Inconel Butter 1-B32-RECIRC-12"-AR-B-6 Nozzle to Safe-end Inconel Butter i
1-832-RECIRC-12"-AR-C-6 Nozzle to Safe-end Inconel Butter 1-532-RECIRC-12"-AR-D-6 Nozzle to Safe-end Inconel Butter l
1-532-RECIRC-12"-BR-F-6
. Nozzle to Safe-end Inconel Butter 1-532-RECIRC-12"-BR-G-6 Nozzle to Safe-end Inconel Butter
!J 1-832-RECIRC-12"-BR-H-6 Nozzle-to-Safe-end Inconel Butter
-l-532-RECIRC-12"-BR-K-6 Nozzle to Safe-end Inconel Butter 1-B11-JPI-4"-N88 Nozzle to Safe-end'Inconel Butter i
F.
i 1
l (700 MAT /ccc) i 6,.
p;.
.,.-+ '
TABLE 4 WELD OVERLAYS TO BE INSPECTED DURING MARCH 1985 OUTAGE
~.
1-B32-12"-AR-E2 Riser Pipe to Elbow 1-B32-12"-BR-H4 '
Riser Pipe to Safe-end Extension
.1-B32-28"-A-15 Discharge Elbow to Piping B32-28"-A-14'
-Discharge Valve to Elbow 1-B32-28"-B-6 Valve to Elbow
( 700 MAT /ccc)
- -.