ML20004E266
| ML20004E266 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/26/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81-434-000 10CFR-050.55E, 10CFR-50.55E, PT21-81-434, PT21-81-434-000, SQRD-50-328-81, NUDOCS 8106110448 | |
| Download: ML20004E266 (3) | |
Text
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-4 TENNESSEEhALLEY AUTHORITY r.s,
T' CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II May 26, 1981 SQRD-50-328/81-35 N
Mr. James. O'Reilly, Director Office of spection and Enforcement U.S. Nuclear egulatory Consnission Region II - St.4te 3100 101 Marietta St eet g
Atlanta, GeorgiaS30303
Dear Mr. O'Reilly:
i SEQUOYAH NUCLEAR PLANT UNIT 2 - PORY OPERATING TIME - SQRD-50-328/81-35
- FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector l
R. V. Crlenjak on April 24, 1981 in accordance with 10 CFR 50.55(e) as HCR SQN KEB 8122. Enclosed is our first interic report. We expect to submit our next report by June 8,1981. We consider 1C CFR 21 applicable to this deficiency.
If you have any questions, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure Mr. Victor Stello, Director (Enclosure), f V
cc:
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 l
An Equal Opportunity Emp; oyer
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ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 2 PORV OPERATING TIME SQRD-50-328/81-35 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency The operational time requirement for the pressurizer PORV is two seconds maximum as stated in the FSAR (section 5.2.2.4.2).
However, the actual operating time for the Copes-Vulcan PORV installed in unit 2 has been showr; during preoperational testing to be approximately five to six s econds. The Westinghouse analysis of cold overpressurization transients assumed a PORV operating time of two seconds. Therefore, the current operating time of five to six seconds could have resulted in RCS pressure transients (which the low temperature overpressurization provisions were designed to prevent) outside the analysis. Tne deficiency is thought to be caused by excessive airflow restriction. The PORV's at
-Sequoyah Nuclear Plant (SNP) unit 1 and Watts Bar Nuclear Plant are Masoneilan valves such that this applies only to SNP unit 2.
Corrective Action TVA has proposed to modify the valve actuator to allow for less airflow restriction to the diaphragm actuator.
TVA is awaiting Westinghouse approval of the proposal, after which the valves will be modified and retested.
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