ML20154J410
| ML20154J410 | |
| Person / Time | |
|---|---|
| Site: | Perry, Catawba, Harris, Grand Gulf, Columbia, River Bend, Vogtle, San Onofre, Comanche Peak, Rancho Seco, Midland, Bellefonte, 05000000, Shoreham, Hartsville |
| Issue date: | 05/12/1988 |
| From: | Block L IMO DELAVAL, INC. |
| To: | NRC OFFICE OF ENFORCEMENT (OE) |
| References | |
| CON-IIT05-224-90, CON-IIT5-224-90, REF-PT21-88, REF-PT21-88-067-000 145, PT21-88-067-000, PT21-88-068-000, PT21-88-67, PT21-88-68, NUDOCS 8805260342 | |
| Download: ML20154J410 (2) | |
Text
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4 Enterprise Engine Dielon D Oakland,rA 94621 Enterpriv Way and 85th Asenue P.O.I M 2:61 415 577-7W May 12, 1988 Director, Office of Inspection and Enforcement US Nuclear Regulatory Commission Washington, D.C.
20553 eport #145 S
Addendum i
Dear Sir,
This report is issued to provide additional inf rmation to eup-plement our Report #145 issued April 29, 1988 to your office.
In our report dated April 29, 1988, we identified a potential prob-lem with the F-573-156 Pressure Sensor / Lube Oil Trip (Calcon P/N B4400).
Additional testing and examinatione conducted by the manufacturer of this component (California Controle Company -
Calcon) have now identif$ed that because of a tolerance etack-up, the diaphragm (Calcon P/N 283) can be held eolid against the pressure head (Calcon P/N 4370), thus creating a emaller eurface area.
This smaller surface area would require a much higher pressure to activate the valve.
On a newly assembled unit thic would not chou up on teet because the diaphragm has not had a chance to etretch and seat itself against the pressure head. Sev-eral houre are needed between teste for the unit to fail. Correc tive action for thie device le to add an additional 1-1/8" diame-ter with.030" deep counterbore in the presoure head (Calcon P/N 4370),
This will always provide a positive gap between the head and diaphragm.
Devices that are already installed and operating after several houre between teste have demonstrated their reliab-ility.
Imo Delaval recommende that all devices not installed, or that are installed but have not operated for several hours between tecte, be returned to Imo Delaval for remachining, increction and testing.
The devices will be remachined, inspected and tested by the manufacturer (Calcon) and identified with the stamping "B4400B" to record the new configuration. IMO Delaval has sup-plied DSR and DSRV engines with thie potential defect to the fol-lowing sites:
UTILITY SITE SERIAL NO.
MODEL LILCO Shoreham 74010/12 DSR-48 4 Syctem Energy Resources Grand Gulf 74033/36 DSRV-16 4 i
Gulf States River Bend 74039/40 DSB-48 Carolina Power & Light Shearon Harrie 74046/49 DSRV-16-4
+ Duke Power Catawba 75017/20 DSRV-16-4 l
So. Cal. Edison San Onofre 75041/42 DSRV-20-4 l
Cleveland Electric Perry 75051/54 DSRV-16-4 TVA Bellefonte 75080/83 DSRV-16-4 Washington Pub. Power WNP-1 75084/85 DSRV-16-4
/[r 8805260342 880512 i
l PDR PT21 EMVIMODL l
88 DCD lp i
a Paer 2 May 12. 1988 US Nuclear Fegulatory Commission (Continued)
UTILITY SITE SERIAL NO.
MODEL Texas Utilities Electric Commanche Peak 76001/04 DSRV-16-4 4 Georgia Fouer Vogtle 76021/24 DSRV-16-4 Consumer Fower Midland 77001/04 DSEV-12-4 TVA Hartsville 77024/25 DSRV-16-4
- SMUD Rancho Seco 81015/16 DSR-48 l
l 4 Note:
Asterisk indicates that the F-573-156 sensor / trip is performing a safety related function in this control system.
A copy of this letter will be sent to all of the sites referenced in the paragraph above as indicated by the carbon copy list, l
Our evaluation of this matter was concluded on May 10, 1988.
Sincerely.
once R.
Block Q.A. Engineer l
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