ML19257C359
| ML19257C359 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/11/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8001280484 | |
| Download: ML19257C359 (1) | |
Text
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- o, UNITED STATES 8'
t, NUCLEAR REGULATORY COMMISSION ,E REGION 11 o,, f 101 MARIETTA ST., N.W., SUITE 3100 ob ATLANTA. G EORGIA 30303 JAf? 1I f:'I In Reply Refer To: RII:JPO 0-259, 50-26 D ~ 50-296 Tennessee Valley Authority Attn:
- 11. C. Parris Manager of Power 500A Chestnut Street Tower II Chattanooga, Tennessee 37401 Gentlemen:
Enclosed is IE Bulletin No. 80-01 which requires action by you with regard to your BWR power reactor facility (ies) with an operating license. Should you have questions regarding this Bulletin or the actions required of you, please contact this office. Sincerely, ~ Q ~f a James P. O'Reilly Director
Enclosures:
1. IE Bulletin No. 80-01 2. List of Recently Issued IE Bulletins 18I9196 sootese w
,p-Tennessee Valley Authority. cc w/ enc 1: H. L. Abercrombie Plant Superintendent Post Office Box 2000 becatur, Alabama 35602 J.$F.Cox 40D Commerce Street W10C131 C-K Knoxville, Tennessee 37902 D. E. Her? 9ud, Project Engineer 400 Che.tnut Street Tower II Chattanooga, Tennessee 37401 E. G. Beasley Tennessee Valley Authority 309 Grant's Building Knoxville, Tennessee 37902 = = \\$\\3 197 e S a
UNITED STATES SSINS No.: 6870 NUCLEAR REGULATORY COMMISSION Accessions No.: OFFICE OF INSPECTION AND ENFORCEMENT 7912190652 WASHINGTON, D.C. 20555 January 11, 1980 IEBulhtinNo.80-01 Y OPERABILITY OF ADS VALVE PNEUMATIC SUPPLY On January 10, 1980, the NRC was informed by Philadelphia Electric Company that engineering evaluation for Peach Bottom 2 and 3 has disclosed that the Automatic Depressurization System (ADS) pneumatic supply (either nitrogen or air) may not be operable for all possible events because of a combination of misapplication of check valve, a lack of leak testing of the accumulator system backing up each ADS valve operator and questions about the continued operability of the pneumatic supply in a seismic event. Attached is a simplified schematic of the pneumatic supply. The check valve nearest to the accumulator is a PAL, three quarter inch, stainless steel, socket welded check valve with a hard seat (valve identification-B-1376 on the upper flange). Plant information at Peach Bottom shows substantial supports for the pneumatic supply inside the drywell, but seismic qualification has not been verified. The licensee has stated that the pneumatic supply is not seismically qualified outside the drywell. Unit 2 was sbutdown on 1/10/80 because of questions of ADS operability and Unit 3 has been provided a seismically qualified nitrogen supply at the containment penetration pending confirmation of seismic qualification of piping inside Unit 2 containment. The licensee is changing their valve to one with a soft seat to reduce leakage. Actions to be taken by Licensees of GE BWR facilities with an operating license which use a pneumatic operator for ADS function: 1. Determine if your facility has installed hard-seat check valves to isolate the ADS accumlator system from the pneumatic supply system. 2. Determine if periodic leak tests have been performed on your ADS accumulator systems to assure emergency pneumatic supply for the FSAR-required number and duration of valve operations. 3. Review seismic qualifications of the ADS pneumatic supply system: (a) from accumulator system isolation check valve to APS valve operator, -i(b) from isolation valve outside containment up to ADS accumulator check valve. 7 4. 'B'ased upon determination of items DUPLICATE DOCUMENT of the ADS for the conditions und including a seismic event. If op to appropriate Technical Specific Entire document previously entered into system under: ANO }Okq 198 4 No. of pages: =}}