ML17312B709
| ML17312B709 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/02/1997 |
| From: | Thomas K NRC (Affiliation Not Assigned) |
| To: | James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 9710090019 | |
| Download: ML17312B709 (7) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&4001 October 2, 1997 Mr. James M. Levine Executive Vice President.
Nuclear Arizona Public Service Company Post Office Box 53999
- Phoenix, Arizona 85072-3999
SUBJECT:
REQUEST FOR INFORMATION REGARDING MONITORING AND OPERATIONAL ASSESSMENT OF STEAM GENERATORS FOR PALO VERDE UNIT 2, AND CONTINUED OPERABILITY OF STEAM GENERATORS FOR PALO VERDE UNITS 1 AND 3
Dear Mr. Levine:
On September 25 and 30, 1997, Arizona Public Service (APS) briefed the NRC staff on the recent steam generator (SG) tube eddy current (EC) inspection results at Palo Verde Unit 2 (PV-2).
The NRC staff requests APS to respond to the tollowing questions pertaining to the condition monitoring and operational assessment ot the steam generators for PV-2 and continued operability of the steam generators for Units 1 and 3.
U-bend Indications During the previous PV-2 outage, APS used a plus point probe to inspect the Row 1 and 2 U-bends.
APS reported at least two indications that were dispositioned as due to "geometry" and thus the affected tubes were returned to service.
During the current refueling outage, APS reported crack-like indications in these same tubes; one of which was 100 percent throughwall.
1.
Discuss the basis for the APS conclusion that for the past operating
- cycle, PV-2 was within its licensing basis with respect to the leakage and structural integrity of the U-bend indications.
Include, at a
- minimum, a discussion of the insitu pressure test results, EC evaluations, and engineering analyses.
Provide the basis for dispositioning the U-bend indications as due to "geometry" in the prior outage.
Include in the discussion a description of the EC signals as well as the results of the "look backs" that supported the "geometry",disposition.
Include a discussion ot the APS plans to address this issue in terms of future EC inspections of the SG tubes.
Based on the U-bend EC inspection results, provide the basis for the APS conclusion that PV-2 is safe to operate for a full cycle.
Provide the basis for. the APS conclusion that Units 1 and 3 are safe to continue operating given similar U-bend'geometry" indications have been reported (rg in those units.
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,Mr. James M. Levine October 2, 1997 Batwin -Sta C linder Wear During the current Unit 2 refueling outage, APS identified the deepest batwing wear indication't 70 percent throughwall.
4.
Discuss the.APS decision to not insitu pressure test or pull the tube with the indication to ensure adequate leakage and structural integrity over the past operating cycle was maintained.
Include, at a minimum, a
discussion of the basis for assigning an EC uncertainty value of 3 to 4 percent.
5.
Based on the batwing-stay cylinder wear inspection results, provide the basis for the APS conclusion that PV-2 is safe to operate for a full cycle.
Provide the.basis for the APS conclusion that Units 1 and 3 are safe to continue operating given similar batwing-stay cylinder wear may exist in those units.
Please respond to this request for information within 30 days from the date of this letter.
If you have any questions, please contact me at (301) 415-.1362.
Sincerely.
Original Signed By Kristine H. Thomas, Project Manager Project Directorate IV-2 Division of Reactor Projects
- III/IV Office of Nuclear Reactor Regulation Docket Nos.
STN 50-528, STN 50-529 DISTRIBUTION:
and STN 50-530
'ocket File PUBLIC cc:
See next page
'DIV-2 Reading EAdensam (EGA1)
WBateman KThomas EPeyton
- OGC, 015B18
- KPerkins, RIV/WCFO
- PGwynn, RIV
- DKirsch, RIV/WCFO
- SCoffin, EMCB
- IBarnes, RIV DOCUMENT NAME: PVSG.RAI OFC DATE PDIV-2/PH KThomas:ye 10/0 /97 AL PDIV-2/LA EFeey 10/~97
Mr. James M. Levine October 2, 1997 Batwin -Sta C linder Wear During the current Unit 2 refueling outage, APS identified the deepest batwing wear indication at 70 percent throughwall.
Discuss the APS decision to.not insitu pressure test or pull the tube with the indication to ensure adequate leakage and structural integrity over the past operating cycle was maintained.
Include, at a minimum, a
discussion of the basis for assigning an EC uncertainty value of 3 to 4 percent.
5.
Based on the batwing-stay cylinder wear inspection results, provide the basis for the APS conclusion that PV-2 is safe to operate for a full cycle.
Provide'he basis for the APS conclusion that Units 1 and 3 are safe to continue operating given similar batwing-stay cylinder wear may exist in those units.
Please respond to this request for information within 30 days from the date of this letter.
If you have any questions, please contact me at'301) 415-1362.
Sincerely, Docket Nos.
STN 50-528, STN 50-529 and STN 50-530
=
cc:
See next'age Kristine M. Thomas, Project Manager Project Directorate IV-2 Division of'eactor Projects
- III/IV Office of Nuclear Reactor Regulation
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Hr. James H. Levine October 2, 1997 CC:
Hr. Steve Olea Arizona Corporation Commission 1200 W.,'ashington Street'hoenix, Arizona 85007 Douglas Kent Porter Senior Counsel Southern California Edison Company Law Department.
Generation Resources P.O.
Box 800
- Rosemead, California 91770 Senior Resident Inspector USNRC P. 0.
Box 40 Buckeye. Arizona
.85326 Regional Administrator, Region IV U. S.
Nuclear Regulatory Commission Harris Tower 8 Payillion 611 Ryan Plaza Drive. Suite 400 Arlington, Texas 76011-8064
- Chairman, Board of Supervisors ATM:
Chairman 301 W. Jefferson.
10th Floor Phoenix.
Arizona 85003 Hr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency 4814 South 40 Street
- Phoenix, Arizona 85040 Hs. Angela K. Krainik, Manager Nuclear Licensing Arizona Public Service Company P.O.
Box 52034
- Phoenix, Arizona 85072-2034 Hr. John C. Horne, Vice President Power Supply Palo Verde Services 2025 N. Third Street, Suite 220 Phoenix.
Arizona 85004 Hr. Robert Burt Los Angeles Department of Water 8 Power Southern California Public Power Authority ill North Hope Street.
Room 1255-B Los Angeles. California 90051 Hr. David Summers Public Service Company of New Mexico 414 Silver SW, ¹0604 Albuquerque, New Mexico 87102 Hr. Robert D. Bledsoe Southern California Edison Company 14300 Mesa
- Road, Drop D41-SONGS San Clemente.
California 92672 Hr. Robert Henry Salt River Project 6504 East Thomas Road Scottsdale, Arizona 85251 Terry Bassham, Esq.
General Counsel El Paso Electric Company 123 W. Hills El Paso, Texas 79901
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