ML19210D981
| ML19210D981 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 11/16/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7911290120 | |
| Download: ML19210D981 (2) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION e
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. E REGION 11 7
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101 MARIETTA ST N.W..SUl1E 3100 o
ATLANTA, GEORGIA 30303 NOV 1 6 1979 In Reply Refer To:
R PO 50-364y]
0-348
, Alabama Power Company Attn:
F. L. Clayton Senior Vice President Post Office Box 2641 Birmingham, Alabama 35291 Gentlemen:
The enclosed IE Circule.r No. 79-22, is forwarded to you for information.
No written response is required.
Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely,
%3 d.6 M.
mes P. O'Reilly D ector
Enclosures:
1.
IE Circular No. 79-22 2.
List of IE Circulars Issued In Last Six Months
)434 202 791120012 6
Alabama Power Company,
cc w/ enc 1:
A. R. Barton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 J. T. Young Vice President-Production Post Office Box 2641 Birmingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance
~ Post Office Box 2641 Birmingham, Alabama 35291 H. O. Thrash Manager-Nuclear Generation Post Office Box 2641 Birmingham, Alabama 35291 H. G. Hairston, III Plant Manager Drawer 470 Ashford, Alabama 36312 R. E. Hollands, Jr.
QA Supervisor Post Office Box U Ashford, Alabama 36312 1454 203
SSINS: 6830 Accession No.-
7908220142 D
- D UNITED STATES iUCLEAR REGULATORY COMMISSION Oh ACE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 November 16, 1979 IE Circular No. 79-22 STR0KE TIMES FOR POWER OPERATED RELIEF VALVES Description of Circumstances:
Most PWRs utilize power-operated relief valves (PORVs) to prevent overpressuriza-tion of the reactor coolant system when the reactor is at low temperature. On April 13, during a pressure transient at Robinson 2, the PORVs did not function as rapidly as intended.
The estimated stroke time for the PORVs was three to five seconds whereas the intended stroke time is two seconds. As a result, the pres-sure transient did approach a pressure limit which is based on nil ductility considerations. Prior to April 13, the PORVs had not been used or exercised since February, 1978, when they had been repacked and stroked. Although the valve stems were scored at that time, stroke times were satisfactory. The licensee and the valve manufacturer believe that the scored stems and the 14-month interval without exercise resulted in poor performance of the PORVs.
Recommended Actions for Licensees' Consideration:
All holders of PWR operating licenses or construction permits should be aware of the potential problem of the type discussed above. Because of the generic implications in this matter, it is recommended that both licensees of operating facilities and holders of construction permits conduct a review to determine if periodic surveillance of PORVs is necessary to assure that the PORVs will perform as intended.
No written response to this Circular is required. If you require additional information regarding these matters, contact the Director of the appropriate NRC Regional Office.
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IE Circular No. 79-22 Enclosure November 16, 1979 Page 1 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular Subject Date of Issued to No.
Issued 79-22 Stroke Times for Power 11/16/79 All Power Reactor Operated Relief Valves Operating facilities and all facilities having a CP 79-21 Prevention of Unplanned 10/19/79 All Iower Reactor Releases of R&dioactivity Operating facilities and all facilities having a CP 79-20 Failure of GTE Sylvania 9/24/79 All Power Reactor Relay, Type PM Bulletin 7305, Operating facilities Catalog SU12-11-AC With A and all utilities 120V AC Coil having a CP 79-19 Loose Locking Devices 9/13/79 All Power Reactor on Ingersoll-Rand Pumps Operating facilities and all utilities having a CP 79-18 Proper Installation of 9/10/79 All Power Reactor Target Rock Safety-Relief Licensees with a CP Valves and/or OL 79-17 Contact Problem in SB-12 8/14/79 All Power Reactor Switches on General Electric Licensees with a CP Company Metalclad Circuit and/or OL Breakers 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Members Of The General Public Licensees And A Radiographer 79-15 Bursting of High Pressure Hose 8/22/79 All R'esearch Reactors (Correc-and Malfunction of Relief tion)
Valve "0" Ring in Certain Self-Contained Breathing Apparatus
)434 205 79-15 Bursting of High Pressure Hose 8/8/79 All Materials Priority I, and Malfunction of Relief Fuel Cycle and Operating Valve "O" Ring in Certain Self-Power Reactor Licensees Contained Breathing Apparatus
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IE Circular No. 79-22 Enclosure November 16, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN Tf.57 SIX MONTHS Circular Subject Date of Issued to No.
Issue 79-14 Unauthorized Procurement and 7/13/79 All Medical Licensees Distribution of XE-133 except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers 79-13 Replacement of Diesel 7/13/79 All Power Reactor Fire Pump Starting Operating Facilities Contactors and all Utilities having a CP 79-12 Potential Disel Generator 6/28/79 All Power Reactors Turbocharger Problem Operating Facilities and all Utilities having a CP 79-11 Design / Construction 6/27/79 All Applicants Interface Problem for, and Holders of Power Reactor cps 79-10 Pipefittings Manufactured 6/26/79 All Power Reactor from Unacceptable Material Licensees with a CP and/or OL 79-09 Occurrences of Split or 6/22/79 All Materials Punctured Regulator Diaparagms Priority I, Fuel In Certain Self Contained Cycle and Operating Breathing Apparatus Reactor Licensees 79-08 Attempted Extortion - Low 5/18/79 All Fuel Facilities Enriched Uranium Licensed by NRC 79-07 Unexpected Speed Increase 5/2/79 All Holders of of Reactor Recirculation BWR OL's or CP's MG Set Resulted in Reactor Power Increase AllHol}dersofkbk 20 79-06 Failure to Use Syringe 4/19/79 and Bottle Shields in dedical Licensees Nuclear Medicine except teletherapy licensees