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August 31. 1979 Mr. Ja:nes P. O'Reilly, Director Serial No. 637A Office of Inspection & Enforcement PSE&C/JMD:mac:weng U. S. Nuclear Regulatory Commission Region II Docket No. 50-339 101 Marietta Street Suite 3100 Atlanta, Georgis 30303 Daar Mr. O'Reilly: | .u...-..~- | ||
On August 1, 1979, a report was made under the provisions of 10CFR50.5S(e) concerning component failures in the Westinghouse 7300 Series Process Control Systs.It was discovered that a f ailure of a component on the 7300 Serias signal comparito 'iAL carl 9sult") in a short.?i condition that ciasad tM 3:seciited 5istable to fail in an unLufe m de. | .. ~. -. | ||
Vepco August 31. 1979 Mr. Ja:nes P. O'Reilly, Director Serial No. 637A Office of Inspection & Enforcement PSE&C/JMD:mac:weng U. S. Nuclear Regulatory Commission Region II Docket No. 50-339 101 Marietta Street Suite 3100 Atlanta, Georgis 30303 Daar Mr. O'Reilly: | |||
On August 1, 1979, a report was made under the provisions of 10CFR50.5S(e) concerning component failures in the Westinghouse 7300 Series Process Control Systs. | |||
It was discovered that a f ailure of a component on the 7300 Serias signal comparito 'iAL carl 9sult") in a short.?i condition that ciasad tM 3:seciited 5istable to fail in an unLufe m de. | |||
This failure would, ho o//er, he detected by normal M 11t oeriadic tastin1. | This failure would, ho o//er, he detected by normal M 11t oeriadic tastin1. | ||
The vendor, Westinghouse, has sucolded revisti components (T?xas Instra.vnt 75460 DIM output driver chip with oull-uo resistorsi to correct all NAL cards. The replacements will be completed on North Anna Unit ? orior to fuel loading. | The vendor, Westinghouse, has sucolded revisti components (T?xas Instra.vnt 75460 DIM output driver chip with oull-uo resistorsi to correct all NAL cards. The replacements will be completed on North Anna Unit ? orior to fuel loading. | ||
This is our final report on this subject, If further information is desired, please advise. | This is our final report on this subject, If further information is desired, please advise. | ||
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Engineeying trd Construction | / | ||
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Senior Vice President Pow?e Statien/ | |||
Engineeying trd Construction cc: M*. Victor Stello. Director Office of Inspection & Enforcement Harold R. Centon, Director Office of Nuclear Reactor Regulation o\\ | |||
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Latest revision as of 00:11, 5 January 2025
| ML19207B863 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/31/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| G37A, NUDOCS 7909050440 | |
| Download: ML19207B863 (1) | |
Text
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4
.u...-..~-
.. ~. -.
Vepco August 31. 1979 Mr. Ja:nes P. O'Reilly, Director Serial No. 637A Office of Inspection & Enforcement PSE&C/JMD:mac:weng U. S. Nuclear Regulatory Commission Region II Docket No. 50-339 101 Marietta Street Suite 3100 Atlanta, Georgis 30303 Daar Mr. O'Reilly:
On August 1, 1979, a report was made under the provisions of 10CFR50.5S(e) concerning component failures in the Westinghouse 7300 Series Process Control Systs.
It was discovered that a f ailure of a component on the 7300 Serias signal comparito 'iAL carl 9sult") in a short.?i condition that ciasad tM 3:seciited 5istable to fail in an unLufe m de.
This failure would, ho o//er, he detected by normal M 11t oeriadic tastin1.
The vendor, Westinghouse, has sucolded revisti components (T?xas Instra.vnt 75460 DIM output driver chip with oull-uo resistorsi to correct all NAL cards. The replacements will be completed on North Anna Unit ? orior to fuel loading.
This is our final report on this subject, If further information is desired, please advise.
/'
,%f G
Ve rulvdour.
/
Y
!,4l/ (/ /
f l'
// /%
~ss c. (rmnWr! " ~ ~ c.[/
s
/
Senior Vice President Pow?e Statien/
Engineeying trd Construction cc: M*. Victor Stello. Director Office of Inspection & Enforcement Harold R. Centon, Director Office of Nuclear Reactor Regulation o\\
s.m m s 49 s
i m oee %
f