ML19329B094
| ML19329B094 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/25/1976 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B081 | List: |
| References | |
| 133, NUDOCS 8001300680 | |
| Download: ML19329B094 (2) | |
Text
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EDEGi\\1 LOWELL E. ROE
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.at Serial No. 133 Facehtes Devescoment (4195 253 5242 October 25, 1976 t
Docket No. 50-346 o
Mr. James G. Keppler
' Regional Director, Region III Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
This Iceter is submitted in accordance with 10CFR 50.55(c) as an interim
]oolantpumpsealinjectionisolationvalveMUHV66Breport regarding the Da i reactor potential defi-v liency, which was reported by telephone conversation between our Mr.
Domeck and your Mr. T. Vandel on September 20, 1976.
C.
Description of the Deficiency Seal injection isolation valve Tag No. HU-HV66B for No. 1-2-2 reactor coolant pump is a 1 " Velan globe valve with a Kielcy & Kueller In-corporated double acting air cylinder operator with internal spring assist to close the valve.
14 of the FSAR.
This valve is shown on Figurc 9-21, Revision The valve in question was supplied by Babcock & Wilcox, is external to the containmant vessel penetration and is in series with a locked open ctop check valve.
i During containment vessel integrated leak rate tests, checks indicated that containment vessel test pressurization air was leaking backwards through this valve.
100 psig control air was connected to the valve cperator to stroke the valva closed and as the air pressure in the cylinder began to build-up, the valve yoke failed.
The valve proper has been disassembled, and with the actuator removed,
)
- und to bc in satisfactory condition and
[ -
operates freely.
It is sus-
\\s-_alve and valve actuator assembly' ted that there might have been t
y:ke is broken, this cannot be verified atAs the on-site operator assembly this time; however, before breakage, and during in-place valve calibration testing, the actuator c;sembly stroked-the valve with no problem.
/
8001300
- f THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MA@tR6r#1/iw4pfS
e When the new yoke is installed, alignment will be checked and corrected",
if required.
The new yoke is on-site and will be installed shortly.
A final definitive report of the deficiency, analysis of the safety implications and the corrective action taken will be submitted to your office in accordance with 10CFR 50.55(e) upon completion of the repair and completion of our
.~. review.
This should be approximately November 19, 1976.
Yours very truly, gr v/ h pc/29/28-29 cc:
Dr. Ernst Volgenau, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washinhton,D.C.
20555 g
9 S
e 4
l b
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