ML17289A677
| ML17289A677 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 06/25/1992 |
| From: | Assa R Office of Nuclear Reactor Regulation |
| To: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| TAC-M83721, NUDOCS 9207020280 | |
| Download: ML17289A677 (6) | |
Text
Dbcket No. 50-397 Hr.
G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way
- Richland, Washington 99352 June 25, 1992 O gg,5 2P7029OCK 050 p>R 0280 <2000Se7
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SUBJECT:
REVIEW OF UPDATED REPORT ON REACTOR RECIRCULATION PIPING FLAW AT THE WASHINGTON PUBLIC POWER SUPPLY SYSTEM (WPPSS)
NUCLEAR REACTOR NUMBER 2 (TAC NO.
M83721)
By letter dated Hay 14, 1991 (G02-92-123),
you submitted updated information regarding a flaw indication in the shutdown cooling suction line of reactor recirculation piping.
Th'is information contained the results of flaw reexamination and fracture mechanics analysis to support plant restart.
Your reexamination of the indication in weld 20RRC(6)-8, on April 21,
- 1992, detected no significant changes in the indication depth nor signal characteristics.
Additionally, you reported that the indications do not exhibit the ultrasonic testing (UT) signal characteristics of Intergranular Stress Corrosion Cracking
( IGSCC.)
Your fracture mechanics analysis indicated that the actual crack depth was approximately 14% of the predicted growth.
Based on the analysis and reexamination, you determined that the indication -is acceptable for continued operation without repair until the next examination'.
Ii The staff has reviewed the results of your flaw reexamination, and concludes that there is reasonable assurance that the structural integrity of the affected pip'ing will be maintained and WNP-2 can be safely operated for the
'upcoming 'fuel cycle 8, tentatively scheduled to begin in July 1992.
Your commitment to continue monitoring and reexamining the indication at the next refueling is acceptable.
This completes our activities related to TAC H83721.
Sincerely, Original signed by Ramin R. Assa, Acting Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation cc:
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Docket No. 50-397 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555 dune 25, i992 Hr.
G.
C. Sorensen, Hanager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way
- Richland, Washington 99352
SUBJECT:
REVIEW OF UPDATED REPORT ON REACTOR RECIRCULATION PIPING FLAW AT THE WASHINGTON PUBLIC POWER SUPPLY SYSTEH (WPPSS)
NUCLEAR REACTOR NUMBER 2 (TAC NO. H83721)
By letter dated Hay 14, 1991 (G02-92-123),
you submitted updated information regarding a flaw indication in the shutdown cooling suction line of reactor recirculation piping.
This information contained the results of flaw reexamination and fracture mechanics analysis to support plant restart.
Your reexamination of the indication in weld 20RRC(6)-8, on April 21,
- 1992, detected no significant changes in the indication depth nor signal characteristics.
Additionally, you reported that the indications do not exhibit the ultrasonic testing (UT) signal characteristics of Intergranular Stress Corrosion Cracking (IGSCC.)
Your fracture mechanics analysis indicated that the actual crack depth was approximately 14% of the predicted growth.
Based on the analysis and reexamination, you determined that the indication is acceptable for continued operation without repair until the next examination.
The staff has reviewed the results of your flaw reexamination, and concludes that there is reasonable assurance that the structural integrity of"the affected piping will be maintained and WNP-2 can be safely operated for the upcoming fuel cycle 8, tentatively scheduled to begin in July 1992.
Your commitment to continue monitoring and reexamining the indication at the next refueling is acceptable.
This completes our activities related to TAC H83721.
Sincerely, cc:
See next page Ramin R. Assa, Acting Project Hanager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
ll Hr.
G.
C. Sorensen WPPSS Nuclear Project No.
2 Washington Public Power Supply System (WNP-2)
CC:
Hr. J.
W. Baker WNP-2 Plant Manager Washington Public Power Supply System P.O.
Box 968, HD 927M
- Richland, Washington 99352 G.
E.
C.
- Doupe, Esq.
Washington Public Power Supply System 3000 George Washington Way P. 0.
Box 968, MD 396
- Richland, Washington 99532 Hr.
R.
G. Waldo, Chairman Energy Facility Site Evaluation Council Hail Stop PY-ll Olympia, Washington 98504 Hr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0, Box 968, HD PE21
- Richland, Washington 99352 Hr. J.
V. Parrish, Assistant Managing Director for Operations Washington Public Power Supply System P. 0.
Box 968, HD 1023
- Richland, Washington 99352 Hr. L. L. Grumme, Acting Director Licensing and Assurance Washington Public Power Supply System P. 0.
Box 968, HD 280
- Richland, Washington 99352 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners P. 0.
Box 190
- Prosser, Washington 99350-0190 Mr.
R.
C. Sorensen U.
S. Nuclear Regulatory Commission P. 0.
Box 69
- Richland, Washington 99352 Nicholas S.
- Reynolds, Esq.
Winston
& Strawn 1400 L Street, N.W.
Washington, D.C.
20005-3502
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Docket No. 50-397 Ar.'. C.'orensen, Manager Regul'atory Programs Washington Public Power Supply System 3000 George Washington Way
- Richland, Washington 99352
SUBJECT:
REVIEW OF UPDATED REPORT ON REACTOR RECIRCULATION PIP G
FLAW AT THE WASHINGTON PUBLIC POWER SUPPLY SYSTEM (WPPSS)
N
. LEAR REACTOR NUMBER 2 (TAC NO. H83721)
By letter dated May 14, 1991 (G02-92-123),
you submitted dated information regarding a flaw indication in the shutdown cooling suc on line of reactor recirculation piping.
This information contained the esults of flaw reexamination and fracture mechanism analysis to supp rt plant restart.
Your reexamination of the indication in weld 20RRC 6)-8, on April 21,
- 1992, detected no significant changes in the indicatio depth nor signal characteristics.
Additionally, you reported th t the indications do not exhibit the ultrasonic testing (UT) signal ch acteristics of Intergranular Stress Corrosion Cracking (IGSCC.)
Your fra ure mechanism analysis indicated that the actual crack depth was approximat y
14% of the predicted growth.
Based on the analysis and reexamination, ou determined that the indication is acceptable for continued operation witho t repair until the next examination.
The staff has reviewed the results of your flaw reexamination, and concludes that there is reasonable assurance at the structural integrity of the affected piping will be maintained and WNP-2 can be safely operated for the upcoming fuel cycle 8, tentative scheduled to begin in July 1992.
Your commitment to continue monitori g and reexamining the indication at the next refueling is acceptable.
This completes our activiti s related to TAC M83721.
Sincerely, cc:
See nex page DISTR IBUT N:
Ramin R. Assa, Acting Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation Docket F le HVirgi o
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