ML19260A320
| ML19260A320 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/23/1979 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-78-10, NUDOCS 7911090330 | |
| Download: ML19260A320 (4) | |
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TENNESSEE VALLEY AUTHORITY C6 t AT T '.N DOG A. TENN Li-SL E 3 74n t 400 Chestnut Street Tower II r
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,,. ; y October 23, 1979 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuc1 car Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303 Dear Mr. O'Reillyr OFFICE OF INSPECTION AND ENFORCEMENT BULLETIN 78 RII:JP0 50-259, -260, -296 - BROUNS FERRY NUCLEAR PLANT The corrective action which was taken as a result of the subject bulletin (describcd in TVA's response to Bulletin 78-10 dated August 10, 1978, J. E. Gilleland to J. P. O'Reilly) has been completed.
Enclosed for your information are the results of those corrective actions.
Very truly yours, TENNESSEE VALLEY AUTHORITY 1\\
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L.'M Nuclear Regulation and Safety Enclosure cc: Office of. Inspection Enforcement (Enclosure)
Division of Rasetor Operations Inspection U.. Nuclear Regulatory Commission Washington, DC 20555 00.Ji3 O
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ENCLOSURE In a TVA letter from J. E. Gilleland to J. P. O'Reilly, of NRC dated August 14, 1978, TVA's approach in complying with the requirements of the subject bulletin for Browns Ferry Nuclear Plant is outlined.
Refueling outages for the three units have now been co=pleted. Bergea-Paterson snubbers of external pipe configuration were subject to inspection under the following conditions:
1.
Serial (lot) numbers were within the suspect range.
2.
Lot numbers were not legible.
3.
Lot number tags were not attached.
The results of our investigation are shown in the attached table and summarized as follows:
Investigation of unit 3 snubbers during the September 1978 refueling outage revealed no snubbers to have lot numbers in the range of interest.
Ilowever, three spare snubbers in the storeroom did have lot numbers in this range.
Al' three accumulator springs were rusty and one was broken.
All springs were replaced.
Thirty-one snubbers were removed from unit I during the December 1978 refueling outage for accumulator spring verification.
Before disassembly all snubbers were functionally tested and all met the operability requirement. During the outage, some snubbers were not disassembled because of time limitations. However, they were identified and subsequently disassembled for spring inspection. Twenty-nine snubbers contained petro-chemical-coated type accumulator springs.
One spring was in good condition; all the rest were rusty. Twenty-one of these springs were also broken. Two snubbers contained teflon-coated accumulator springs.
One spring was in good condition and one had some rust spots.
Three snubbers were removed from unit 2 during the April 1979 refueling outage to check accumulator spring condition. One snubber contained a petro-chemical-coated spring which was rusty and brc~en.
The other two snubbers contained teflon-coated springs which were in good condition.
In total, 37 snubbers were examined and 23 had broken accumulator springs.
All snubbers were functionally tested before being disassembled; all met the functional test acceptance criteria.
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ATTACHMENT i
BERGEN-PATERSON ACCUMULATOR SPRING INSTECTION DETAll,S Snubber System Nunber Lot Number Size Spring Conti_ng Spring Condition Corrective Action Unit 3 - September 1978 - No Snubbers Within Subject Lots Storeroom - September 1978, Storeroom NA Missing HSSA 10 etro-Chemical Rusty Installed teflon-coated spring NA F 62955 HSSA 10 Petro-Chemical Rusty & broken Installed teflon-coated spring NA F 62955 HSSA 10 Petro-Chemical Rusty Installed teflon-coated spring Unit 1 - December 1978 Main Steam SSAl Obliterated HSSA 20 Petro-Chemical Rusty Installed spare snubber SSB2 Obliterated HSSA 30 Petro-Chemical Rusty & broken Installed spare snubber SSB4 F 61284 HSSA 10 Petro-Chemical Rusty Installed spare snubber
-SSB5 Missing IISSA 10 Petro-Chemical Rusty & broken Installed spare snubler SSC1 F 61284 HSSA 30 Petro-Chemical Rusty & broken
. Installed teflon-coated spring SSC2 F 61284 HSSA 30 Petro-Chemical Rusty & broken Installed teflon-coated spring SSC4 F 61284 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber Feedwater SSAI M(ssing HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber.
SSA2 F 62955 HSSA 10 Petro-Chemical Rusty Installed teflon-coated spring SSA4
,F 61284 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber SSAS F 61284 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber SSA6 Missing HSSA 10 Petro-Chemical Rusty Installed spare snubber SSA7 P 62955 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber SSA8 F 61284 HSSA 10 Petro-Chemical Rusty & 1roken Installed spare snubber SSA9 Obliterated IISSA 10 Petro-Chemical Rusty & broken Installed spare snubber SSBl F 61284
!!SSA 10 Petro-Chemical Rusty & broken Installed spare snubber U
SSB2 Missing IISSA 10 Fetro-Chemical Rusty & broken Installed spare snubber O
SSB3 F 61284 IISSA 10 Petro-Chemical Rusty & broken Installed teflon-coated spring SSB4 F 61284 HSSA 10 Petro, Chemical Rusty & broken Installed spare snubber SSBS Missing IISSA 10 Petro-Chemical Rusty Installed teflon-coated spring g
SSB6 Missing HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber Ln SSB8 Missing IISSA 10 Petro-Cnemical Rusty & broken Installeri stainless-steel spring SSB9 F 61284 HSSA 10 Petro-Chemical Rusty & broken Installed spare snuhber
BCRGEN-PATERSON ACCUMULATOR SPRING INSPECTION DETAILS (continued)
Snubber System Number I,o t Number Size Spring Coating Spring Condition Corrective Action Core Spray R-2 F 62955 HSSA 10 Petro-Chemical Rusty 6 broken Installed spare snubber R-6 North F 62955 HSSA 10 Petro-Chemical Rusty Installed teflon-coated spring R-8 F 62955 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber R-9 F 62955 HSSA 10 Petro-Chemical Rusty & broken Installed spare snubber
.R-13 North F 62955 HSSA 10 Petro-Chemical Good Installed spare snubber R-13 South F-62955 HSSA 10 Petro-Chemical Rusty Installed spare
.cbber RCIC R-7 Lower Obliterated HSSA 3 Teflon Good Installed spare snubber PSC SSIZ Missing HSSA 10 Teflon Rusty Installed teflon-coated spring Unit 2 - April 1979 PSC SS7AX F 61284 HSSA-10 Petro-Chemical Rusty & 'uroken Installed spare = snubber RCIC R-7 Lower Oblitera.ed HSSA-3 Teflon Good Reinstalled snubber R-5 East Obliterated HSSA-3 Teflon Geod Reinstalled snubber
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