ML20030B427
| ML20030B427 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/07/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8108180080 | |
| Download: ML20030B427 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower I gj %d)t 1 81 M
s BLRD-50-438/81-45 g
\\ i' !f p-).'g BLRD-50-439/81-47 b
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Mr. James P. O'Reilly, Director g 17198 * '_9 i
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Office of Inspection and Enforcement vessA M,MW j
M U.S. Nuclear Regulatory Commission g
Region II - Suite 3100
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/f 101 Marietta Street Atlanta, Georgia 30303 iso
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DRESSER SAFETY VALVES -
BLRD-50-438/81-45, BI.RD-50-439/81 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector D. Quick on July 9, 1981 in accordance with 10 CFR 50.55(e) as NCR BLN NEB 8109 Enclosed is our first interim report. We expect to submit our next report by February 17, 1982. We consider 10 CFR Part 21 applicable to this defic'.ency.
If you have any questions concerning this mTtter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L
M. Mills, nager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stollo, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commis.M un Washington, DC 20555 Mr. James McFarland (Enclosure)
Senior Project Aanager Babcock & Wilcox Company P.O. Box 1260 Lynchtarg, Virginia 24505 bo i 8108100090 810807 PDR ADOCK 05000438 S
PDR An Equal Opportunity Employer
e eo ENCLOSURE BELLEFONTE NUCLEAR plt.NT UNITS 1 AND 2 DRESSER SAFETY VALVES BLRD-50-438/81-45, BLRD-50-439/81-47 10 CFR 50.55(e)
FIRST INTERIM REPORT 1
Description of Deficiency A Dres.eer screty valve, model 31709NA, recently tested in EPRI's safety and relief valve test program apparently suffered unacceptable intern ~al damage during a full pressure steam test. The configuration of piping associated with this valve is similar, but not identical, to that intended for use at Bellefonte; and at this time it is uncertain if the piping configuration or the valve is deficient. The Dresser valves are to be used at Bellefonte as pressurizer safety valves.
The valve was tested June 3, 1981 with the valve set to open at 2480 psia.
The valve opened at 15 psi below this aat point, chattered severely, and subse,uently failed to close properly. Post test inspection of the valve indicated internal damage to components including galling of guide surfaces.
Interim Progress TVA is in the process of determining the degree of similarity, and the applicability of the test configuration and conditions with those at t
Bellefonte.
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