View source for 05000373/LER-1983-146, Updated LER 83-146/03X-1:on 831109,local Leak Rate for Inboard Feedwater Check Valves 1B21-F010A/B Exceeded Tech Spec.Caused by Gaps on Perimeter of Disc Seal Matl. Manufacturer Supplying One Piece seals.W/840313 Ltr

{{Adams
| number = ML20087N078
| issue date = 02/21/1984
| title = Updated LER 83-146/03X-1:on 831109,local Leak Rate for Inboard Feedwater Check Valves 1B21-F010A/B Exceeded Tech Spec.Caused by Gaps on Perimeter of Disc Seal Matl. Manufacturer Supplying One Piece seals.W/840313 Ltr
| author name = Diederich G, Dus R
| author affiliation = COMMONWEALTH EDISON CO.
| addressee name = Keppler J
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| docket = 05000373
| license number = 
| contact person = 
| document report number = LER-83-146-03X, LER-83-146-3X, NUDOCS 8404030083
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 4
}}
{{LER
| Title = Updated LER 83-146/03X-1:on 831109,local Leak Rate for Inboard Feedwater Check Valves 1B21-F010A/B Exceeded Tech Spec.Caused by Gaps on Perimeter of Disc Seal Matl. Manufacturer Supplying One Piece seals.W/840313 Ltr
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000373
| LER year = 2083
| LER number = 146
| LER revision = 
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

=text=
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sysNT OasCn            PTtON AND PROSASLE CONSEQUENCES h                                                                                                                                           I g l On Nov. 9,1983, with Unit-1 shutdown for a planned outaae. Local Leak Rate Tests were It was determined thatt g , performed on the inboard feedwater check valves (1821-F010A/B).
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        ,           ,,               ,o Randy Dus                                                                              815/357-6761
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                                                 .. .-.              -- .                - _ - . . _ - -                        . _ - . . -.               . - .           _ - . - ...-.. a             - -      - - , _ - .

.a   .o I. LER NUMBER:      83-146/03X-1
: 11. LASALLE COUNTY STATION:       Unit 1 Ill. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:
On November 9, 1983, with Unit One shutdown for a planned outage, Local Leak Rate Tests were performed on the inboard feedwater check valves (1821-F010A/B).
It was determined that the Technical Specification 3.6.1.2 Limit of .6 La (231.4 SCFH) was exceeded.
V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:
The feedwater lines still have two isolation valves in each line which meet the requirements of Appendix J to 10CFR50 criteria as containment isolation valves.                   .
The feedwater lines between the inboard and outboard check valves as well as the valves themselves are specially designed and constructed in accordance with Standard Review Plan 3.6.2-10 and ASME Section 3, so as to preclude the possibility of a credible line break between the check valves. Therefore, it is believed that the check valves would serve their original procured function of preventing a significant loss of vessel inventory in the event of a feed-water line break.
It is, therefore, believed that no immediate safety hazards existed, and that the plant was maintained in a safe condition at all times.
VI. CAUSE:
The subject valves are tilting disc check valves manufactured by the Anchor Darling Company. It was determined that the excessive leakage was a result of gaps found on the perimeter of the disc seal material, one aboutTheseone-half gaps inch long and the other about one and one half inches in length.
It was also noticed appeared at the seam, or " vulcanized", points of the seal.
that one of the seal's material appeared to be hardened slightly with multiple minute cracks,     in addition, alignment problems were identified that would have prevented the discs from closing squarely against the seal.
Vll. CORRECTIVE ACTION:
Immediate action was taken to repai r the valves. The valve manufacturer (Anchor-Darling) is now supplying LSCS with new molded (one piece) seals as was used in the original design. Also, a representative of the Anchor-Darling Co.
has been on-site to resolve the alignment problems.                      ,
As of 11-3 CF83, an acceptable Local Leak Rate Test had been performed on 1821-F010B after a molded (one piece) seal was installed and the disc to hinge pin horizontal clearance was adjusted to within Anchor-Darling speci-
              ' fications. . Work is progressing on 1B21-F010A to install a molded seal and

          * *
* LER NUMBER:      83-146/03X-1 Vll. CORRECTIVE ACTION (Cont'd):
and to make more critical adjustments of the vertical positioning of the disc assembly with Anchor Darling Specifications. 1821-F010A will be Local Leak Rate Tested when the above vnrk is completed prior to startup.
Additional corrective actions to assure that the seal failures Aincourse                                     theseofvalves have been identified and the problems corrected are underway.
action to procure and install qualified seals in accordance with the require-
 '                 ments of Appendix B of'10CFR Part 50 are outlined in a Confirmatory Action Letter dated 11/28/83 from J. Keppler (NRC) to C. Reed (Ceco).
Prepared by:             Randy S. Dus 9
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f^N           Commonw;cith Edison
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                        ) RuralRoute #1 Box 220LaSalle County Nuclear Station (t  ___
                 -s    7 Marseilles,il!inois 61341
(        /    Telephone 815/357-6761 March 13, 1984 James G. Keppler Regional Administrator Region lil U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

==Dear Sir:==

Reportable Occurrence Report #83-146/03X-1 Docket #050-373 is being submitted to your office to supersede previously submitted Reportable Occurrence Report
             #83-146/03L-0, in accordance with NUREG-0161, " Instructions for Preparation of Data Entry Sheets for Licensee Event Report (LER) File"; General Instruction No. 3 f-G. J. Diederich Superintendent LaSalle County Station l
GJD/GW/sjc Enclosure cc: Di rector of Inspection & Enforcement Director of Management Information & Program Control U.S. NRC Document Management Branch INP0-Records Cen ter l                  File /NRC l
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}}

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