ML20044A952
| ML20044A952 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 07/10/1990 |
| From: | Taylor D COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-88-001, IEB-88-1, NUDOCS 9007170057 | |
| Download: ML20044A952 (3) | |
Text
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Y f.;a Commonwaalth Edis:n 1400 Opus Place'
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D:wn:rs Grove, Illinois 60515
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July 10,1990 m
- Mr..- A.= Ber t. Davis Regional Administrator
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U.S. Nuclear Regulatory Commission Region III i
799 Roosevelt Road
' Glen Ellyn,fil 60137-y*
Subject:
- Byron Station Units 1 and 2 Supplemental Response to NRC Bulletin No. 88-01 NRC Docket Nos. 50-454/MS. ' TACS 65955/65956
Reference:
(a) HRC-Bulletin No. 88-01, dated February 5, 1988 (b) H.E. Morgan letter to A. Bert Davis, dated April 8, 1988 (c) M.H. Richter letter to A. Bert Davis, dated 1
May 15, 1989
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Dear Mr. Davis:
Reference (a),' addressed to all holders of operating licenses or construction permits for nuclear power reactors, provided information on-Hestinghouse series DS circuit breakers and safety. concerns associated with their use. Addressees using these breakers in Class lE service were-requested
-to perform and document inspection of the welds on the pole shafts and y
inspection of the alignment in the breaker closing mechanism.
'As reported in Reference (b),1 the reactor trip / bypass breakers for 1
both: units had initially'been-inspected within the 30 day period requested by F
Reference 1(a). These initialJinspections revealed the reactor trip / bypass 1
Tbreakers'and marginal pole shaft welds; requiring reinspection:at 200 cycles.
The. Unit l' reactor trip / bypass breakers were reinspected and the pole shafts were replaced during the Unit I refueling outage-(Fall 1988), which was.the first refueling outage for the unit following-the issuance of Reference (a).'
The resultslof.the inspections on the Unit 1 reactor trip / bypass breakers were y
reflected in the breaker inspections reported in Reference (c).
In addition, Reference (c) reported that~for Byron' unit =2,-
Ltwenty-nine (29) assigned breakers-(which included the-4 Unit'2: reactor trip / bypass breakers) had "short-term" and "long-term" inspections performed, m
as defined in Reference (a), during the Unit 2 refuelini outage;(Spring H
-1989)~.u The results' of' these inspections were also reflected in -Reference (c).
The remaining Byron Station breakers, consist,ng of forty-eight -(48)05-206 breaker; and two-(2)05-416 breahers. were inspected ("short term" and-
.long term" inspections)'during the Byron Unit 1 Spring 1990 refueling.
outage._.The inspections performed on these breakers included the welds on the
. pole shaft and a direct check of the alignment of,the breaker closing mechanism. Pole' shafts were repitted on those breakers which failed to meet
'all of the-weld acceptance criteria ~ identified in Reference (a). Poleshafts
'on 47 cf the 48 0S-206 breakers and 2 of the 2 05-416 breakers were replaced.
Corrective action for. al1gnment of the breaker closing mechanisms was not
'i required for any of the. inspections performed during this outage.
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.. inspections.are presented as an attachment.to'thisl letter...This' completes the.
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..The final.resultsLof the Byron Station Units-l'and 2 OS breaker' q
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t inspections of the Hestinghouse series DS circuit breakers,'as1 requested by Reference (a), for Byron St& tion Units 1 and 2.
Therefore,.no further action e
v is-required by Byron Station for Reference (a).
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o Please direct any quest 1ons that.you may.have concerning thisi
.l t u response toEthis office.
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Respectfully, by f)f l
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.D.L. Taylor 3
-Generic Issues'Administratori
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,b Subscribe and Sworn to NOTAU PUBuc MATE OF ILLINOIS
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ATTACHMENT JS qlii@'
COMPOSITE
SUMMARY
0F INSPECTIONS PERFORMED c
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' NUMBER OF BREAKERS
- 1H USE
- SPARES TYPE DS 416 (Reactor b
-9 1
Trip Breaker)
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108 74' 34 DS'206 (Class.1E) i DS 416 (C1 ass 1E)
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M;ga:
7 Totals 121 86 35
- /i Inspections Reported After BIR02 (Unit 1 Fall 1988 refueling outage)
til s.
0S8.16L(RTB) 5-4 1
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Df.206_(lE)
- 37.
35-2
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03416 (IE)
'i-Total:
42 39 3-1
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Inspections Reported Af ter 82R01 (Unit 2 -Spring 1989 refueling. outage):
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0S416-(RTB) 4 4
b BS206'(IE)-
23 23 BS416:-(IE)
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2-Total:
-29 29 0
N,
-Inspections: Reported After BIR03 (Unit 1 Spring 1990-refueling outage):
y I5416-(RTB D
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- n 05206 (IE)=
48-16 32 05416 (IE)'
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Total:
50 18 32
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- -10TAL:
121 86 35 l
9g FINAd!NSPECTIONRESULTS:
7 TYPL4_lf TYPE 206 o.
ho.'of breakers inspected 13 108
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No.;of_ breakers which had pole
- 5. hafts replaced due-to welds 13 107 n Ji Noi of breakers requiring corrective
/ action for alignment 0
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