IR 05000237/2019076
| ML17252A228 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/15/1976 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| BBS Ltr. #76-679 50-237/1975-55 | |
| Download: ML17252A228 (3) | |
Text
- Commonweat9dison Nuclear Power Station* R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920
- BBS Ltr. f/76-679 fij I f Septe..'llber 15, 1976 egu a ery Docket file * Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations-Region U. S. Nuclear Regulatfory Commission 799 Roosevelt Road Glen:Ellyn, Illinois 60137 REFERENCE:
Docket Number 50-237 Docket Number 50-249 Enclosed please find Reportable Occurrence This report is being submitted to your office in accordance with the_ Dresden Nuc:J_ear Power Station Technical Specifications, Section 6.6.B. * _ .... ---..,._ . 7-V..?,_)..
ts.'-B-:' *:Stephe-nson BBS :jo Enclosure cc: Direct.or of Inspection
& Enforcement
- Station Superintendent Dresden Nuclear Power Station Director of Management Information
& Program Control File/NRC 9566 l CONTROL BLOCK: I 1 EVENT REPORT * I . . I I . I I . (PLEASE PRINT ALL REQUIRED INFORMATION]
LICENSEE . NAME @El lI IL IP 1*R IS I?. I 7 8 9 14 CATEGORY @E]-CON'T I I I 7 . 8 57 58 REPORT TYPE. lfJ 59 EVENT .DESCRIPTIO LICENSE NUMBER* LICENSE TYPE 10101-10101010101-1010 I I I I / I I I I I 15 25 26 30 REPORT SOURCE lhJ 60 DOCKET NUMBER EVENT OATE If 1717 IG I 61 68 69 74 -EVENT TYPE 10131 . 31 32 REPORT. OA TE 10111' l5171G I 75 BO lol2l I tOU..OWiNG--
AN INSP£CT10N,'
A PDST-MAINIC.NANCE 5URV£1LLANC£ . 7 8 9 . 80 lol31 l'PER.FoRMEJ)
ON TH£ A" STANDBY GAS IHE MAXIMUM ATTAtNABU:
FLOW I 7 8 9 . . . . . . .. 80 101411 THROVG- TH£ IAAIN WAS 375"0 CFM WHICH !S "BELOW IHE" TECH S-PEC l .. Hn11 OF I 7 8 9 80 lolsl l.yooo GEM' ALL VAt..V.£$
fN Ilf£ FLOW J.AN£UP) tNCWDING-Fl-OW CONTR..OL VAlV£ %-1 7 8 9 . . . . .. * . 80 lol61 175]0-A WERE V£R1F1EDT0 BG" FVL!.-Y OPEN. PRESSORE-f)ROP "RE"AD1NG-S W£RE I 1 0 9 ' PRIME* (SE:E. A1TAC.HE"D SJ.JE"Ei}so SYSTEM . CAUSE . COMPONENT COMPONENT . CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER*
VIOLATION
@E] ISICI l.gj IF'l 1 li...l-rlEIRI ltU IAl:llllOI lYJ 7 8 9 10 11 12 17 43 44 . 47 48 CAUSE DESCRIPTION lol81 "ttH£ /Jj.,j-FLoW C0/11.Dt-ftO IN "A 11 WAS Cl/USE:P BY A DIR-TY PR£-H!ZPA I . 7 8 9 . . . 80 I ecreR:* .. me Pfe£-H6PA FIL-r* wAs R.*PLACEO 1 AND svsr£YY1 FL.Ow RE;:TIJRN82 To* I 7 8 9 . 80 *. * l-1-lol lyooo c.rtvL .fR£S5uR£;_DRDP.1<EAPttJG-S .TAKEN ON *THE '"B" SBG-TS TRP.IN*
I . 7 8 g FACILITY . . . METHOD OF (S*E 80 STATUS * * 'l6 POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION . EEJ lfil I 019 Io I I N 1t I @J "I..__ _____ A/_A __________
-..J 1 0 s 10 * 12 13 44 * 45 46 ap FORM OF ACTIVITY CONTENT RELEA!jEO
- OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE [El raJ . I NII-._____..___N_._4
________ ....,.-7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION
[IEJ Io I C?JO I 7 8. 9 11 Nit.* 12 13 BO PERSONNEL INJURIES ITEJ 1010101 '-'D-ES-CR-IP-Tl-ON_N'_
11_. _* 7 8 9 11 12 80 OFFSITE CONSEQUENCES
{ill) N/1 7 8 9 . LOSS OR DAMAGE TO FACILITY 80 TYPE DESCRIPTION NA 7 8 9. 10 BO PUBLICITY fil?] ;VA 7 8 9 88 ADDITIONAL FACTORS 7 8 9 ' A 80 7 8.9 80 NAMr:: * G'.. Rom BA PHONE: £"X/. ;)t,< .
--"--:-... * ... *:.:------* --**** *--... :. .. _ -* .. *.-_...: __ ;. *-****-* . --* *-*--'* .........
--*-***-*------. *-. -* * --. EVENT DESCRIPTION (Continued)
subsequently taken across the entire train, The post-HEPA filter *exhibited a pressure drop of 1,0 inches H20, while the pre-HEPA filter exhibited a pressure drop of 2,3 inches H20, The pre-HEPA filter was replaced, and the pressure drop across the new filter was reduced to 1,0 inches H 2 0, *restoring system flow to normal, The redundant nB" standby gas train had been demonstrated to be operable before the "A't train was removed from service for inspectio This is the first reported failure of this nature on .the standby gas treatment.syste (50-237/1976-55)
CAUSE DESCRIPTION (Continued that the pre-HEPA filter on that train was also becoming clogged with dirt; however, total flow remained above Tech Spec limits, The "B" train filter was replace To prevent recurrence, the surveillance procedure for testing SBGT sys'tem filters has. been revised to include typical clean-filter pressure-:--drop values. This will facilitate identification and replacement of system.filters .which are approaching the limit of serviceability, -