ML20030C170
| ML20030C170 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/13/1981 |
| 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, BLN-MEB-8005, NCR-0020, NCR-20, NUDOCS 8108250457 | |
| Download: ML20030C170 (2) | |
Text
.
TENNESSEE VALLEY AUTHORITY
?/
p
- q *T A NOCG A TENNFSSEC 37 tm
'1 b (y,,,
1300 Chestnut Street Tower II
'r,g February 13, 1981
'L-lji 80- 6 of- 0Bb j g< ' ~ g ' '
y -Ce fa - 0 24 V Mr. James P. O'Reilly, Director
[
c.EJ Offic? of Inspection and Enforcement U.S. Nuclear Regulatory Commission
[-
q' 5 8[
3 0 * ![
Region II - Suite 3100 i. y%
- [6.
D 101 Marietta Street b
'j g/
Atlanta, Georgia 3030s y
Y
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - BORG-WARNER 3" MOTOR OPERATED GATE VALVES - NCR'S 0020 AND BLN MEB 8005 - SECOND SUPPLEhENTAL REPORT On March 17, 1980, R. W. Wright, NRC-0IE Region II, was informed that NCR 0020 was determined to be reportable in accordance with 10 CFR 50.55(e).
This was followed by our final report dated April 16, 1980. As a result of new information received subsequent to the final report, related NCR BLN MEB 8005 was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our supplemental report dated Noveaber 6, 1980. Enclosed is our second supplemental report. We consider 10 CFR Part 21 to be applicable to this deficiency. We expect to submit our next report by May 7, 1981.
If you have any questions concerning this matter, please get in touch with D. L. Lunbert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY l
l 59 N
L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Conmission Washington, DC 20555 d
D'])\\'p, N Y :
8108250457 810213 PDR ADOCK 05000430 S
__ 7__7
e e
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 I
BORG-WARNER 3" MOTOR OPERATED GATE VALVES NCR'S 0020 AND BLN MEB 8005 10 CFR 50.55(e)
SECOND SUPPLEMENTAL REPORT Description of Deficiency During a test program conducted by Duke Power Company at Marshaltown Steam Station, Borg-Warner's standard 3",1500-pound motor operating gate valve failed to fbily close when actuated pder opgrating conditions. The operating conditions were 2485 lb/in at 650 F with a flow rate of 220,000 pounds per hour of steam, which is equivalent to a velocity of approxi-mately 40 feet per second. Under these conditions, the valve closed to within 10 percent of full closure.
Through a number of subsequent tests, the problem was resolved to be a lack of proper guiding, combined with very high bearing stresses between the gates and the seats which caused binding just before full closure.
Similar valves are used at Bellefonte in the Component Cocling Water System, Reactor Coolant System, Makeup and Purificatica System, and Decay Heat Removal System.
Interim Progress Although Borg-Warner believes the valves at Bellefonte may not be sus-ceptible to the deficiency as described, they have proposed a program to test the valves at Bellefonte.
One 3" valve has been returned to Borg-Warner for testing. Borg-Warner will weld flanges to the valve and then ship the valve to Approved Engineering Test Laboratory (AETL) in Chats-worth, California. The valve will be subjected to the worst case TVA system flow and pressure, Results will be made available to TVA upon completion of test.
-