ENS 53891
ENS Event | |
|---|---|
05:00 Feb 20, 2019 | |
| Title | Part 21 Report - Flowserve Valve Assist Springs May Prevent Full Closure |
| Event Description | The following report was received via fax:
Description: GE BWXT, acting on behalf of Ontario Power sent five valves back to the Flowserve facility for evaluation of the spring which could spread apart when the flapper rotates open and wedge between the valve body and flapper, creating the potential for the valve flapper to stick open. Evaluation: Shop inspections of the returned valves confirmed the potential for the spring legs to rotate outwards and potentially wedge between the flapper and seat retainer. Of the five valves evaluated, two of the valves had the spring legs rotate outward and after repeated cycles got caught between the flapper and disc; on one of the instances the spring legs prevented full closure of the flapper. If the valves have a safety-related function to isolate flow and must transfer closed, then the springs could prevent the valve from performing its safety related function. The evaluation determined the cause is an inadequate spring design which allows the spring to deflect and permit the legs to move outward. Extent of Condition: In discussion with the customer, it is believed the problem did not exist with valves originally supplied from the Worcester, Scarborough Canada facility; although this cannot be confirmed by Flowserve. It is believed the extent of condition resides with valves and replacement springs supplied from the Flowserve Raleigh, NC facility when the product line was transferred and the spring vendors changed; even though it has been confirmed that the springs supplied out of the Raleigh, NC facility comply with the product drawing requirements. The springs were first sold in valve assemblies or as replacement parts from the Raleigh facility starting in 2008. Valve Scope: The scope of impacted valves is the Worcester series 44 swing check valves. (Please note Worcester also has a series 44 three piece ball valve, which is not in the scope.} The Raleigh facility has supplied parts or valves for four Worcester series 44 swing check valves assemblies which use these springs. The drawings numbers for these valve assemblies are listed below: Drawing Valve Size Customer KN44-0590 1.5 X 1 X 1.5 Bruce Power, GE BWXT & Ontario Power KN44-0630 2 Comanche Peak 14-107362-001 1.5 X 1 X 1.5 GE BWXT 16-118733-001 1.5 X 1 X 1.5 GE BWXT Corrective Actions: 1) Owner's may remove the springs. The valves will check-off and seal under low pressure conditions without the assistance of the spring; this was demonstrated in shop tests using tap water pressure (approximately 60 psig) and will initiate closure when full open without the assistance of the spring. 2) Flowserve is evaluating alternate spring designs along with the possibility of adding guides to prevent the undesired spring movement. Any new design will be proof tested. Respectfully submitted, Mark Rain, PE Product/Design Engineering Specialist Flowserve Corporation Flow Control Division 1900 S. Saunders St. Raleigh, NC 27603" |
| Where | |
|---|---|
| Flowserve Raleigh, North Carolina (NRC Region 1) | |
| Organization: | Flowserve |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+57.58 h2.399 days <br />0.343 weeks <br />0.0789 months <br />) | |
| Opened: | Mark Rain 14:35 Feb 22, 2019 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Feb 22, 2019 |
| 53891 - NRC Website
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Flowserve with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 571672024-06-07T04:00:0007 June 2024 04:00:00
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