ML18136A230
| ML18136A230 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 11/16/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7911290173 | |
| Download: ML18136A230 (5) | |
Text
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c,'-~p.R REG(J(.q e
UNITED STATES
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NUCLEAR REGULATORY COMMISSION REGION II
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'f'o In Reply Refer To:
RII:JPO 50-338, 50-339 50-404, 50-405
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101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 NOV 1 6 1979 1 Virginia Electric and Power Company Attn:
W. L. Proffitt Senior Vice President, Power P. 0. Box 26666 Richmond, Virginia 23261 Gentlemen:
The enclosed IE Circular 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.
Enclosures:
- 1.
IE Circular No. 79-22
- 2.
List of IE Circulars Issued In Last Six Months Sincerely,
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0-.w,). -~ \\. '-.'... \\*~ il-mes P. 0' Reilly Dll ector 7911290113,
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Virginia Electric and Power Company cc w/encl:
e W.R. Cartwright, Station Manager Post Office Box 402 Mineral, Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager Post Office Box 315
- surry, Virginia 23883 e
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, UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 November 16, 1979 SSINS:
6830 Accession No.:
7908220142 IE Circular No. 79-22 STROKE 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.
e IE Circular No. 79-22 November 16, 1979 Circular No.
79-22 79-21 79-20 79-19 79-18 79-17 79-16 79-15 (Correc-tion) 79-15 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Subject Stroke Times for Power Operated Relief Valves Prevention of Unplanned Releases of Radioactivity Failure of GTE Sylvania Relay, Type PM Bulletin 7305, Catalog 5U12-11-AC With A 120V AC Coil Loose Locking Devices on Ingersoll-Rand Pumps Date of Issued 11/16/79 10/19/79 9/24/79 9/13/79 Proper Installation of 9/10/79 Target Rock Safety-Relief Valves Contact Problem in SB-12 8/14/79 Switches on General Electric Company Metalclad Circuit Breakers Excessive Radiation Exposures 8/16/79 To Members Of The General Public And A Radiographer Bursting of High Pressure Hose 8/22/79 and Malfunction of Relief Valve "0" Ring in Certain Self-Contained Breathing Apparatus Bursting of High Pressure Hose 8/8/79 and Malfunction of Relief Valve "O" Ring in Certain Self-Contained Breathing Apparatus Enclosure.*
Page 1 of 2 Issued to All Power Reactor Operating facilities and all facilities having a CP All Power Reactor Operating facilities and all facilities having a CP All Power Reactor Operating facilities and all utilities having a CP All Power Reactor Operating facilities and all utilities having a CP All Power Reactor Licensees with a CP and/or OL All Power Reactor Licensees with a CP and/or OL All Radiography Licensees All Research Reactors All Materials Priority I, Fuel Cycle and Operating Power Reactor Licensees
IE Circular No. 79-22 November 16, 1979 e
LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79-14 79-13 79-12 79-11 79-10 79-09 79-08 79-07 79-06 Subject Unauthorized Procurement and Distribution of XE-133 Replacement of Diesel Fire Pump Starting Contactors Potential Disel Generator Turbocharger Problem Design/Construction Interface Problem Pipefittings Manufactured from Unacceptable Material Occurrences of Split or Punctured Regulator Diaphragms In Certain Self Contained Breathing Apparatus Attempted Extortion - Low Enriched Uranium Unexpected Speed Increase of Reactor Recirculation MG Set Resulted in Reactor Power Increase Failure to Use Syringe and Bottle Shields in Nuclear Medicine Date of Issue 7 /13/79 7 /13/79 6/28/79 6/27 /79 6/26/79 6/22/79 5/18/79 5/2/79 4/19/79 e
Enclosure Page 2 of 2 Issued to All Medical Licensees,,
except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers All Power Reactor Operating Facilities and all Utilities having a CP All Power Reactors Operating Facilities and all Utilities having a CP All Applicants for, and Holders of Power Reactor CPs All Power Reactor Licensees with a CP and/or OL All Materials Priority I, Fuel Cycle and Operating Reactor Licensees All Fuel Facilities Licensed by NRC All Holders of BWR OL 1 s or CP 1 s All Holders of Medical Licensees except teletherapy licensees